Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1333557 > unrolled thread

[PATCH 0/5] xen: avoid module usage in non-modular code

Back to article view | Back to linux.kernel

Contents

  [PATCH 0/5] xen: avoid module usage in non-modular code Paul Gortmaker <paul.gortmaker@windriver.com> - 2016-02-14 21:40 +0100
    [PATCH 2/5] drivers/xen: make [xen-]ballon explicitly non-modular Paul Gortmaker <paul.gortmaker@windriver.com> - 2016-02-14 21:40 +0100
      Re: [PATCH 2/5] drivers/xen: make [xen-]ballon explicitly  non-modular Stefano Stabellini <stefano.stabellini@eu.citrix.com> - 2016-02-15 13:00 +0100
    [PATCH 4/5] drivers/xen: make sys-hypervisor.c explicitly non-modular Paul Gortmaker <paul.gortmaker@windriver.com> - 2016-02-14 21:40 +0100
      Re: [PATCH 4/5] drivers/xen: make sys-hypervisor.c explicitly  non-modular Stefano Stabellini <stefano.stabellini@eu.citrix.com> - 2016-02-15 13:00 +0100
    [PATCH 3/5] drivers/xen: make xenbus_dev_[front/back]end explicitly non-modular Paul Gortmaker <paul.gortmaker@windriver.com> - 2016-02-14 21:40 +0100
      Re: [Xen-devel] [PATCH 3/5] drivers/xen: make xenbus_dev_[front/back]end  explicitly non-modular Stefano Stabellini <stefano.stabellini@eu.citrix.com> - 2016-02-15 13:00 +0100
    [PATCH 1/5] xen: audit usages of module.h ; remove unnecessary instances Paul Gortmaker <paul.gortmaker@windriver.com> - 2016-02-14 21:40 +0100
      Re: [PATCH 1/5] xen: audit usages of module.h ; remove unnecessary  instances Stefano Stabellini <stefano.stabellini@eu.citrix.com> - 2016-02-15 12:50 +0100

#1333557 — [PATCH 0/5] xen: avoid module usage in non-modular code

This series of commits is a part of a larger project to ensure
people don't reference modular support functions in non-modular
code.  Overall there was roughly 5k lines of dead code in the
kernel due to this.  So far we've fixed several areas, like tty,
x86, net, ... and we continue to work on other areas.

There are several reasons to not use module support for code that
can never be built as a module, but the big ones are:

 (1) it is easy to accidentally write unused module_exit and remove code
 (2) it can be misleading when reading the source, thinking it can be
      modular when the Makefile and/or Kconfig prohibit it
 (3) it requires the include of the module.h header file which in turn
     includes nearly everything else.
 (4) it gets copied/replicated into other code and spreads like weeds.

For the xen subsystem, there are just five commits:

First, we get rid of "include <linux/module.h>" instances that are
completely unnecessary.

Then #2 and #3 and #5 are basically trivial remapping to the
appropriate non-modular counterparts, meaning that there is no
runtime change here either.

The fourth hypervisor commit is similar, but also has removal of
some dead code associated with the module_exit function that will
never be called.  So the runtime should be the same, but the object
file will be different (reduced in size).

Patches created on linux-next and build tested for x86-64 and ARM64
allmodconfig.

---

Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: David Vrabel <david.vrabel@citrix.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: xen-devel@lists.xenproject.org

Paul Gortmaker (5):
  xen: audit usages of module.h ; remove unnecessary instances
  drivers/xen: make [xen-]ballon explicitly non-modular
  drivers/xen: make xenbus_dev_[front/back]end explicitly non-modular
  drivers/xen: make sys-hypervisor.c explicitly non-modular
  drivers/xen: make platform-pci.c explicitly non-modular

 arch/arm/include/asm/xen/hypercall.h     |  2 ++
 drivers/xen/balloon.c                    |  4 ----
 drivers/xen/events/events_2l.c           |  1 -
 drivers/xen/events/events_base.c         |  2 +-
 drivers/xen/events/events_fifo.c         |  1 -
 drivers/xen/features.c                   |  2 +-
 drivers/xen/grant-table.c                |  1 -
 drivers/xen/platform-pci.c               | 16 ++++++----------
 drivers/xen/sys-hypervisor.c             | 31 ++++---------------------------
 drivers/xen/xen-balloon.c                | 14 +++-----------
 drivers/xen/xen-pciback/conf_space.c     |  2 +-
 drivers/xen/xen-pciback/pciback_ops.c    |  2 +-
 drivers/xen/xen-pciback/xenbus.c         |  2 +-
 drivers/xen/xen-selfballoon.c            |  1 -
 drivers/xen/xenbus/xenbus_dev_backend.c  | 13 ++-----------
 drivers/xen/xenbus/xenbus_dev_frontend.c | 13 ++-----------
 drivers/xen/xenbus/xenbus_xs.c           |  1 -
 drivers/xen/xenfs/xensyms.c              |  1 -
 18 files changed, 24 insertions(+), 85 deletions(-)

-- 
2.6.1

[toc] | [next] | [standalone]

#1333558 — [PATCH 2/5] drivers/xen: make [xen-]ballon explicitly non-modular

The Makefile / Kconfig currently controlling compilation here is:

obj-y   += grant-table.o features.o balloon.o manage.o preempt.o time.o
[...]
obj-$(CONFIG_XEN_BALLOON)               += xen-balloon.o

...with:

drivers/xen/Kconfig:config XEN_BALLOON
drivers/xen/Kconfig:    bool "Xen memory balloon driver"

...meaning that they currently are not being built as modules by anyone.

Lets remove the modular code that is essentially orphaned, so that
when reading the driver there is no doubt it is builtin-only.

In doing so we uncover two implict includes that were obtained
by module.h having such a wide include scope itself:

In file included from drivers/xen/xen-balloon.c:41:0:
include/xen/balloon.h:26:51: warning: ‘struct page’ declared inside parameter list [enabled by default]
 int alloc_xenballooned_pages(int nr_pages, struct page **pages);
                                                   ^
include/xen/balloon.h: In function ‘register_xen_selfballooning’:
include/xen/balloon.h:35:10: error: ‘ENOSYS’ undeclared (first use in this function)
  return -ENOSYS;
          ^

This is fixed by adding mm-types.h and errno.h to the list.

We also delete the MODULE_LICENSE tags since all that information
is already contained at the top of the file in the comments.

Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: David Vrabel <david.vrabel@citrix.com>
Cc: xen-devel@lists.xenproject.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
 drivers/xen/balloon.c     |  4 ----
 drivers/xen/xen-balloon.c | 14 +++-----------
 2 files changed, 3 insertions(+), 15 deletions(-)

diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index 7c8a2cf16f58..9781e0dd59d6 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -42,7 +42,6 @@
 #include <linux/kernel.h>
 #include <linux/sched.h>
 #include <linux/errno.h>
-#include <linux/module.h>
 #include <linux/mm.h>
 #include <linux/bootmem.h>
 #include <linux/pagemap.h>
@@ -760,7 +759,4 @@ static int __init balloon_init(void)
 
 	return 0;
 }
-
 subsys_initcall(balloon_init);
-
-MODULE_LICENSE("GPL");
diff --git a/drivers/xen/xen-balloon.c b/drivers/xen/xen-balloon.c
index 39e7ef8d3957..79865b8901ba 100644
--- a/drivers/xen/xen-balloon.c
+++ b/drivers/xen/xen-balloon.c
@@ -33,7 +33,9 @@
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <linux/kernel.h>
-#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/mm_types.h>
+#include <linux/init.h>
 #include <linux/capability.h>
 
 #include <xen/xen.h>
@@ -109,14 +111,6 @@ static int __init balloon_init(void)
 }
 subsys_initcall(balloon_init);
 
-static void balloon_exit(void)
-{
-    /* XXX - release balloon here */
-    return;
-}
-
-module_exit(balloon_exit);
-
 #define BALLOON_SHOW(name, format, args...)				\
 	static ssize_t show_##name(struct device *dev,			\
 				   struct device_attribute *attr,	\
@@ -250,5 +244,3 @@ static int register_balloon(struct device *dev)
 
 	return 0;
 }
-
-MODULE_LICENSE("GPL");
-- 
2.6.1

[toc] | [prev] | [next] | [standalone]

#1334418 — Re: [PATCH 2/5] drivers/xen: make [xen-]ballon explicitly non-modular

[Multipart message — attachments visible in raw view] — view raw

On Sun, 14 Feb 2016, Paul Gortmaker wrote:
> The Makefile / Kconfig currently controlling compilation here is:
> 
> obj-y   += grant-table.o features.o balloon.o manage.o preempt.o time.o
> [...]
> obj-$(CONFIG_XEN_BALLOON)               += xen-balloon.o
> 
> ...with:
> 
> drivers/xen/Kconfig:config XEN_BALLOON
> drivers/xen/Kconfig:    bool "Xen memory balloon driver"
> 
> ...meaning that they currently are not being built as modules by anyone.
> 
> Lets remove the modular code that is essentially orphaned, so that
> when reading the driver there is no doubt it is builtin-only.
> 
> In doing so we uncover two implict includes that were obtained
> by module.h having such a wide include scope itself:
> 
> In file included from drivers/xen/xen-balloon.c:41:0:
> include/xen/balloon.h:26:51: warning: ‘struct page’ declared inside parameter list [enabled by default]
>  int alloc_xenballooned_pages(int nr_pages, struct page **pages);
>                                                    ^
> include/xen/balloon.h: In function ‘register_xen_selfballooning’:
> include/xen/balloon.h:35:10: error: ‘ENOSYS’ undeclared (first use in this function)
>   return -ENOSYS;
>           ^
> 
> This is fixed by adding mm-types.h and errno.h to the list.
> 
> We also delete the MODULE_LICENSE tags since all that information
> is already contained at the top of the file in the comments.
> 
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
> Cc: David Vrabel <david.vrabel@citrix.com>
> Cc: xen-devel@lists.xenproject.org
> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>


>  drivers/xen/balloon.c     |  4 ----
>  drivers/xen/xen-balloon.c | 14 +++-----------
>  2 files changed, 3 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
> index 7c8a2cf16f58..9781e0dd59d6 100644
> --- a/drivers/xen/balloon.c
> +++ b/drivers/xen/balloon.c
> @@ -42,7 +42,6 @@
>  #include <linux/kernel.h>
>  #include <linux/sched.h>
>  #include <linux/errno.h>
> -#include <linux/module.h>
>  #include <linux/mm.h>
>  #include <linux/bootmem.h>
>  #include <linux/pagemap.h>
> @@ -760,7 +759,4 @@ static int __init balloon_init(void)
>  
>  	return 0;
>  }
> -
>  subsys_initcall(balloon_init);
> -
> -MODULE_LICENSE("GPL");
> diff --git a/drivers/xen/xen-balloon.c b/drivers/xen/xen-balloon.c
> index 39e7ef8d3957..79865b8901ba 100644
> --- a/drivers/xen/xen-balloon.c
> +++ b/drivers/xen/xen-balloon.c
> @@ -33,7 +33,9 @@
>  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
>  
>  #include <linux/kernel.h>
> -#include <linux/module.h>
> +#include <linux/errno.h>
> +#include <linux/mm_types.h>
> +#include <linux/init.h>
>  #include <linux/capability.h>
>  
>  #include <xen/xen.h>
> @@ -109,14 +111,6 @@ static int __init balloon_init(void)
>  }
>  subsys_initcall(balloon_init);
>  
> -static void balloon_exit(void)
> -{
> -    /* XXX - release balloon here */
> -    return;
> -}
> -
> -module_exit(balloon_exit);
> -
>  #define BALLOON_SHOW(name, format, args...)				\
>  	static ssize_t show_##name(struct device *dev,			\
>  				   struct device_attribute *attr,	\
> @@ -250,5 +244,3 @@ static int register_balloon(struct device *dev)
>  
>  	return 0;
>  }
> -
> -MODULE_LICENSE("GPL");
> -- 
> 2.6.1
> 

[toc] | [prev] | [next] | [standalone]

#1333559 — [PATCH 4/5] drivers/xen: make sys-hypervisor.c explicitly non-modular

The Kconfig currently controlling compilation of this code is:

config XEN_SYS_HYPERVISOR
       bool "Create xen entries under /sys/hypervisor"

...meaning that it currently is not being built as a module by anyone.

Lets remove the modular code that is essentially orphaned, so that
when reading the driver there is no doubt it is builtin-only.

Since module_init translates to device_initcall in the non-modular
case, the init ordering remains unchanged with this commit.  However
one could argue that fs_initcall() might make more sense here.

This change means that the one line function xen_properties_destroy()
has only one user left, and since that is inside an #ifdef, we just
manually inline it there vs. adding more ifdeffery around the function
to avoid compile warnings about "defined but not used".

Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: David Vrabel <david.vrabel@citrix.com>
Cc: xen-devel@lists.xenproject.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
 drivers/xen/sys-hypervisor.c | 31 ++++---------------------------
 1 file changed, 4 insertions(+), 27 deletions(-)

diff --git a/drivers/xen/sys-hypervisor.c b/drivers/xen/sys-hypervisor.c
index b5a7342e0ba5..ea6e98d60af0 100644
--- a/drivers/xen/sys-hypervisor.c
+++ b/drivers/xen/sys-hypervisor.c
@@ -9,7 +9,7 @@
 
 #include <linux/slab.h>
 #include <linux/kernel.h>
-#include <linux/module.h>
+#include <linux/init.h>
 #include <linux/kobject.h>
 #include <linux/err.h>
 
@@ -366,11 +366,6 @@ static int __init xen_properties_init(void)
 	return sysfs_create_group(hypervisor_kobj, &xen_properties_group);
 }
 
-static void xen_properties_destroy(void)
-{
-	sysfs_remove_group(hypervisor_kobj, &xen_properties_group);
-}
-
 #ifdef CONFIG_XEN_HAVE_VPMU
 struct pmu_mode {
 	const char *name;
@@ -484,11 +479,6 @@ static int __init xen_pmu_init(void)
 {
 	return sysfs_create_group(hypervisor_kobj, &xen_pmu_group);
 }
-
-static void xen_pmu_destroy(void)
-{
-	sysfs_remove_group(hypervisor_kobj, &xen_pmu_group);
-}
 #endif
 
 static int __init hyper_sysfs_init(void)
@@ -517,7 +507,8 @@ static int __init hyper_sysfs_init(void)
 	if (xen_initial_domain()) {
 		ret = xen_pmu_init();
 		if (ret) {
-			xen_properties_destroy();
+			sysfs_remove_group(hypervisor_kobj,
+					   &xen_properties_group);
 			goto prop_out;
 		}
 	}
@@ -535,21 +526,7 @@ version_out:
 out:
 	return ret;
 }
-
-static void __exit hyper_sysfs_exit(void)
-{
-#ifdef CONFIG_XEN_HAVE_VPMU
-	xen_pmu_destroy();
-#endif
-	xen_properties_destroy();
-	xen_compilation_destroy();
-	xen_sysfs_uuid_destroy();
-	xen_sysfs_version_destroy();
-	xen_sysfs_type_destroy();
-
-}
-module_init(hyper_sysfs_init);
-module_exit(hyper_sysfs_exit);
+device_initcall(hyper_sysfs_init);
 
 static ssize_t hyp_sysfs_show(struct kobject *kobj,
 			      struct attribute *attr,
-- 
2.6.1

[toc] | [prev] | [next] | [standalone]

#1334422 — Re: [PATCH 4/5] drivers/xen: make sys-hypervisor.c explicitly non-modular

On Sun, 14 Feb 2016, Paul Gortmaker wrote:
> The Kconfig currently controlling compilation of this code is:
> 
> config XEN_SYS_HYPERVISOR
>        bool "Create xen entries under /sys/hypervisor"
> 
> ...meaning that it currently is not being built as a module by anyone.
> 
> Lets remove the modular code that is essentially orphaned, so that
> when reading the driver there is no doubt it is builtin-only.
> 
> Since module_init translates to device_initcall in the non-modular
> case, the init ordering remains unchanged with this commit.  However
> one could argue that fs_initcall() might make more sense here.
> 
> This change means that the one line function xen_properties_destroy()
> has only one user left, and since that is inside an #ifdef, we just
> manually inline it there vs. adding more ifdeffery around the function
> to avoid compile warnings about "defined but not used".

Actually xen_sysfs_uuid_destroy, xen_compilation_destroy,
xen_sysfs_version_destroy, and xen_sysfs_type_destroy are also
one-liners with only one user left.


> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
> Cc: David Vrabel <david.vrabel@citrix.com>
> Cc: xen-devel@lists.xenproject.org
> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
> ---
>  drivers/xen/sys-hypervisor.c | 31 ++++---------------------------
>  1 file changed, 4 insertions(+), 27 deletions(-)
> 
> diff --git a/drivers/xen/sys-hypervisor.c b/drivers/xen/sys-hypervisor.c
> index b5a7342e0ba5..ea6e98d60af0 100644
> --- a/drivers/xen/sys-hypervisor.c
> +++ b/drivers/xen/sys-hypervisor.c
> @@ -9,7 +9,7 @@
>  
>  #include <linux/slab.h>
>  #include <linux/kernel.h>
> -#include <linux/module.h>
> +#include <linux/init.h>
>  #include <linux/kobject.h>
>  #include <linux/err.h>
>  
> @@ -366,11 +366,6 @@ static int __init xen_properties_init(void)
>  	return sysfs_create_group(hypervisor_kobj, &xen_properties_group);
>  }
>  
> -static void xen_properties_destroy(void)
> -{
> -	sysfs_remove_group(hypervisor_kobj, &xen_properties_group);
> -}
> -
>  #ifdef CONFIG_XEN_HAVE_VPMU
>  struct pmu_mode {
>  	const char *name;
> @@ -484,11 +479,6 @@ static int __init xen_pmu_init(void)
>  {
>  	return sysfs_create_group(hypervisor_kobj, &xen_pmu_group);
>  }
> -
> -static void xen_pmu_destroy(void)
> -{
> -	sysfs_remove_group(hypervisor_kobj, &xen_pmu_group);
> -}
>  #endif
>  
>  static int __init hyper_sysfs_init(void)
> @@ -517,7 +507,8 @@ static int __init hyper_sysfs_init(void)
>  	if (xen_initial_domain()) {
>  		ret = xen_pmu_init();
>  		if (ret) {
> -			xen_properties_destroy();
> +			sysfs_remove_group(hypervisor_kobj,
> +					   &xen_properties_group);
>  			goto prop_out;
>  		}
>  	}
> @@ -535,21 +526,7 @@ version_out:
>  out:
>  	return ret;
>  }
> -
> -static void __exit hyper_sysfs_exit(void)
> -{
> -#ifdef CONFIG_XEN_HAVE_VPMU
> -	xen_pmu_destroy();
> -#endif
> -	xen_properties_destroy();
> -	xen_compilation_destroy();
> -	xen_sysfs_uuid_destroy();
> -	xen_sysfs_version_destroy();
> -	xen_sysfs_type_destroy();
> -
> -}
> -module_init(hyper_sysfs_init);
> -module_exit(hyper_sysfs_exit);
> +device_initcall(hyper_sysfs_init);
>  
>  static ssize_t hyp_sysfs_show(struct kobject *kobj,
>  			      struct attribute *attr,
> -- 
> 2.6.1
> 

[toc] | [prev] | [next] | [standalone]

#1333560 — [PATCH 3/5] drivers/xen: make xenbus_dev_[front/back]end explicitly non-modular

The Makefile / Kconfig currently controlling compilation here is:

obj-y   += xenbus_dev_frontend.o
[...]
obj-$(CONFIG_XEN_BACKEND) += xenbus_dev_backend.o

...with:

drivers/xen/Kconfig:config XEN_BACKEND
drivers/xen/Kconfig:    bool "Backend driver support"

...meaning that they currently are not being built as modules by anyone.

Lets remove the modular code that is essentially orphaned, so that
when reading the driver there is no doubt it is builtin-only.

Since module_init translates to device_initcall in the non-modular
case, the init ordering remains unchanged with this commit.

We also delete the MODULE_LICENSE tag since all that information
is already contained at the top of the file in the comments.

Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: David Vrabel <david.vrabel@citrix.com>
Cc: xen-devel@lists.xenproject.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
 drivers/xen/xenbus/xenbus_dev_backend.c  | 13 ++-----------
 drivers/xen/xenbus/xenbus_dev_frontend.c | 13 ++-----------
 2 files changed, 4 insertions(+), 22 deletions(-)

diff --git a/drivers/xen/xenbus/xenbus_dev_backend.c b/drivers/xen/xenbus/xenbus_dev_backend.c
index ee6d9efd7b76..4a41ac9af966 100644
--- a/drivers/xen/xenbus/xenbus_dev_backend.c
+++ b/drivers/xen/xenbus/xenbus_dev_backend.c
@@ -5,7 +5,7 @@
 #include <linux/mm.h>
 #include <linux/fs.h>
 #include <linux/miscdevice.h>
-#include <linux/module.h>
+#include <linux/init.h>
 #include <linux/capability.h>
 
 #include <xen/xen.h>
@@ -18,8 +18,6 @@
 
 #include "xenbus_comms.h"
 
-MODULE_LICENSE("GPL");
-
 static int xenbus_backend_open(struct inode *inode, struct file *filp)
 {
 	if (!capable(CAP_SYS_ADMIN))
@@ -132,11 +130,4 @@ static int __init xenbus_backend_init(void)
 		pr_err("Could not register xenbus backend device\n");
 	return err;
 }
-
-static void __exit xenbus_backend_exit(void)
-{
-	misc_deregister(&xenbus_backend_dev);
-}
-
-module_init(xenbus_backend_init);
-module_exit(xenbus_backend_exit);
+device_initcall(xenbus_backend_init);
diff --git a/drivers/xen/xenbus/xenbus_dev_frontend.c b/drivers/xen/xenbus/xenbus_dev_frontend.c
index 9433e46518c8..8c0a359ab4a8 100644
--- a/drivers/xen/xenbus/xenbus_dev_frontend.c
+++ b/drivers/xen/xenbus/xenbus_dev_frontend.c
@@ -55,7 +55,7 @@
 #include <linux/string.h>
 #include <linux/slab.h>
 #include <linux/miscdevice.h>
-#include <linux/module.h>
+#include <linux/init.h>
 
 #include "xenbus_comms.h"
 
@@ -63,8 +63,6 @@
 #include <xen/xen.h>
 #include <asm/xen/hypervisor.h>
 
-MODULE_LICENSE("GPL");
-
 /*
  * An element of a list of outstanding transactions, for which we're
  * still waiting a reply.
@@ -624,11 +622,4 @@ static int __init xenbus_init(void)
 		pr_err("Could not register xenbus frontend device\n");
 	return err;
 }
-
-static void __exit xenbus_exit(void)
-{
-	misc_deregister(&xenbus_dev);
-}
-
-module_init(xenbus_init);
-module_exit(xenbus_exit);
+device_initcall(xenbus_init);
-- 
2.6.1

[toc] | [prev] | [next] | [standalone]

#1334419 — Re: [Xen-devel] [PATCH 3/5] drivers/xen: make xenbus_dev_[front/back]end explicitly non-modular

On Sun, 14 Feb 2016, Paul Gortmaker wrote:
> The Makefile / Kconfig currently controlling compilation here is:
> 
> obj-y   += xenbus_dev_frontend.o
> [...]
> obj-$(CONFIG_XEN_BACKEND) += xenbus_dev_backend.o
> 
> ...with:
> 
> drivers/xen/Kconfig:config XEN_BACKEND
> drivers/xen/Kconfig:    bool "Backend driver support"
> 
> ...meaning that they currently are not being built as modules by anyone.
> 
> Lets remove the modular code that is essentially orphaned, so that
> when reading the driver there is no doubt it is builtin-only.
> 
> Since module_init translates to device_initcall in the non-modular
> case, the init ordering remains unchanged with this commit.
> 
> We also delete the MODULE_LICENSE tag since all that information
> is already contained at the top of the file in the comments.
> 
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
> Cc: David Vrabel <david.vrabel@citrix.com>
> Cc: xen-devel@lists.xenproject.org
> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>


>  drivers/xen/xenbus/xenbus_dev_backend.c  | 13 ++-----------
>  drivers/xen/xenbus/xenbus_dev_frontend.c | 13 ++-----------
>  2 files changed, 4 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/xen/xenbus/xenbus_dev_backend.c b/drivers/xen/xenbus/xenbus_dev_backend.c
> index ee6d9efd7b76..4a41ac9af966 100644
> --- a/drivers/xen/xenbus/xenbus_dev_backend.c
> +++ b/drivers/xen/xenbus/xenbus_dev_backend.c
> @@ -5,7 +5,7 @@
>  #include <linux/mm.h>
>  #include <linux/fs.h>
>  #include <linux/miscdevice.h>
> -#include <linux/module.h>
> +#include <linux/init.h>
>  #include <linux/capability.h>
>  
>  #include <xen/xen.h>
> @@ -18,8 +18,6 @@
>  
>  #include "xenbus_comms.h"
>  
> -MODULE_LICENSE("GPL");
> -
>  static int xenbus_backend_open(struct inode *inode, struct file *filp)
>  {
>  	if (!capable(CAP_SYS_ADMIN))
> @@ -132,11 +130,4 @@ static int __init xenbus_backend_init(void)
>  		pr_err("Could not register xenbus backend device\n");
>  	return err;
>  }
> -
> -static void __exit xenbus_backend_exit(void)
> -{
> -	misc_deregister(&xenbus_backend_dev);
> -}
> -
> -module_init(xenbus_backend_init);
> -module_exit(xenbus_backend_exit);
> +device_initcall(xenbus_backend_init);
> diff --git a/drivers/xen/xenbus/xenbus_dev_frontend.c b/drivers/xen/xenbus/xenbus_dev_frontend.c
> index 9433e46518c8..8c0a359ab4a8 100644
> --- a/drivers/xen/xenbus/xenbus_dev_frontend.c
> +++ b/drivers/xen/xenbus/xenbus_dev_frontend.c
> @@ -55,7 +55,7 @@
>  #include <linux/string.h>
>  #include <linux/slab.h>
>  #include <linux/miscdevice.h>
> -#include <linux/module.h>
> +#include <linux/init.h>
>  
>  #include "xenbus_comms.h"
>  
> @@ -63,8 +63,6 @@
>  #include <xen/xen.h>
>  #include <asm/xen/hypervisor.h>
>  
> -MODULE_LICENSE("GPL");
> -
>  /*
>   * An element of a list of outstanding transactions, for which we're
>   * still waiting a reply.
> @@ -624,11 +622,4 @@ static int __init xenbus_init(void)
>  		pr_err("Could not register xenbus frontend device\n");
>  	return err;
>  }
> -
> -static void __exit xenbus_exit(void)
> -{
> -	misc_deregister(&xenbus_dev);
> -}
> -
> -module_init(xenbus_init);
> -module_exit(xenbus_exit);
> +device_initcall(xenbus_init);
> -- 
> 2.6.1
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel
> 

[toc] | [prev] | [next] | [standalone]

#1333562 — [PATCH 1/5] xen: audit usages of module.h ; remove unnecessary instances

Code that uses no modular facilities whatsoever should not be
sourcing module.h at all, since that header drags in a bunch
of other headers with it.

Similarly, code that is not explicitly using modular facilities
like module_init() but only is declaring module_param setup
variables should be using moduleparam.h and not the larger
module.h file for that.

In making this change, we also uncover an implicit use of BUG()
in inline fcns within arch/arm/include/asm/xen/hypercall.h so
we explicitly source <linux/bug.h> for that file now.

Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: David Vrabel <david.vrabel@citrix.com>
Cc: xen-devel@lists.xenproject.org
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
 arch/arm/include/asm/xen/hypercall.h  | 2 ++
 drivers/xen/events/events_2l.c        | 1 -
 drivers/xen/events/events_base.c      | 2 +-
 drivers/xen/events/events_fifo.c      | 1 -
 drivers/xen/features.c                | 2 +-
 drivers/xen/grant-table.c             | 1 -
 drivers/xen/xen-pciback/conf_space.c  | 2 +-
 drivers/xen/xen-pciback/pciback_ops.c | 2 +-
 drivers/xen/xen-pciback/xenbus.c      | 2 +-
 drivers/xen/xen-selfballoon.c         | 1 -
 drivers/xen/xenbus/xenbus_xs.c        | 1 -
 drivers/xen/xenfs/xensyms.c           | 1 -
 12 files changed, 7 insertions(+), 11 deletions(-)

diff --git a/arch/arm/include/asm/xen/hypercall.h b/arch/arm/include/asm/xen/hypercall.h
index d769972db8cb..b6b962d70db9 100644
--- a/arch/arm/include/asm/xen/hypercall.h
+++ b/arch/arm/include/asm/xen/hypercall.h
@@ -33,6 +33,8 @@
 #ifndef _ASM_ARM_XEN_HYPERCALL_H
 #define _ASM_ARM_XEN_HYPERCALL_H
 
+#include <linux/bug.h>
+
 #include <xen/interface/xen.h>
 #include <xen/interface/sched.h>
 #include <xen/interface/platform.h>
diff --git a/drivers/xen/events/events_2l.c b/drivers/xen/events/events_2l.c
index 7dd46312c180..51b488f5bfe9 100644
--- a/drivers/xen/events/events_2l.c
+++ b/drivers/xen/events/events_2l.c
@@ -9,7 +9,6 @@
 #include <linux/linkage.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
-#include <linux/module.h>
 
 #include <asm/sync_bitops.h>
 #include <asm/xen/hypercall.h>
diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
index 524c22146429..488017a0806a 100644
--- a/drivers/xen/events/events_base.c
+++ b/drivers/xen/events/events_base.c
@@ -26,7 +26,7 @@
 #include <linux/linkage.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
-#include <linux/module.h>
+#include <linux/moduleparam.h>
 #include <linux/string.h>
 #include <linux/bootmem.h>
 #include <linux/slab.h>
diff --git a/drivers/xen/events/events_fifo.c b/drivers/xen/events/events_fifo.c
index eff2b88003d9..9289a17712e2 100644
--- a/drivers/xen/events/events_fifo.c
+++ b/drivers/xen/events/events_fifo.c
@@ -36,7 +36,6 @@
 #include <linux/linkage.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
-#include <linux/module.h>
 #include <linux/smp.h>
 #include <linux/percpu.h>
 #include <linux/cpu.h>
diff --git a/drivers/xen/features.c b/drivers/xen/features.c
index 99eda169c779..d7d34fdfc993 100644
--- a/drivers/xen/features.c
+++ b/drivers/xen/features.c
@@ -7,7 +7,7 @@
  */
 #include <linux/types.h>
 #include <linux/cache.h>
-#include <linux/module.h>
+#include <linux/export.h>
 
 #include <asm/xen/hypercall.h>
 
diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
index effbaf91791f..bb36b1e1dbcc 100644
--- a/drivers/xen/grant-table.c
+++ b/drivers/xen/grant-table.c
@@ -33,7 +33,6 @@
 
 #define pr_fmt(fmt) "xen:" KBUILD_MODNAME ": " fmt
 
-#include <linux/module.h>
 #include <linux/sched.h>
 #include <linux/mm.h>
 #include <linux/slab.h>
diff --git a/drivers/xen/xen-pciback/conf_space.c b/drivers/xen/xen-pciback/conf_space.c
index 9c234209d8b5..8e67336f8ddd 100644
--- a/drivers/xen/xen-pciback/conf_space.c
+++ b/drivers/xen/xen-pciback/conf_space.c
@@ -10,7 +10,7 @@
  */
 
 #include <linux/kernel.h>
-#include <linux/module.h>
+#include <linux/moduleparam.h>
 #include <linux/pci.h>
 #include "pciback.h"
 #include "conf_space.h"
diff --git a/drivers/xen/xen-pciback/pciback_ops.c b/drivers/xen/xen-pciback/pciback_ops.c
index 73dafdc494aa..5ad01f9c24fc 100644
--- a/drivers/xen/xen-pciback/pciback_ops.c
+++ b/drivers/xen/xen-pciback/pciback_ops.c
@@ -6,7 +6,7 @@
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
-#include <linux/module.h>
+#include <linux/moduleparam.h>
 #include <linux/wait.h>
 #include <linux/bitops.h>
 #include <xen/events.h>
diff --git a/drivers/xen/xen-pciback/xenbus.c b/drivers/xen/xen-pciback/xenbus.c
index 4843741e703a..c252eb3f0176 100644
--- a/drivers/xen/xen-pciback/xenbus.c
+++ b/drivers/xen/xen-pciback/xenbus.c
@@ -6,7 +6,7 @@
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
-#include <linux/module.h>
+#include <linux/moduleparam.h>
 #include <linux/init.h>
 #include <linux/list.h>
 #include <linux/vmalloc.h>
diff --git a/drivers/xen/xen-selfballoon.c b/drivers/xen/xen-selfballoon.c
index 3b2bffde534f..53a085fca00c 100644
--- a/drivers/xen/xen-selfballoon.c
+++ b/drivers/xen/xen-selfballoon.c
@@ -71,7 +71,6 @@
 #include <linux/swap.h>
 #include <linux/mm.h>
 #include <linux/mman.h>
-#include <linux/module.h>
 #include <linux/workqueue.h>
 #include <linux/device.h>
 #include <xen/balloon.h>
diff --git a/drivers/xen/xenbus/xenbus_xs.c b/drivers/xen/xenbus/xenbus_xs.c
index ba804f3d8278..374b12af8812 100644
--- a/drivers/xen/xenbus/xenbus_xs.c
+++ b/drivers/xen/xenbus/xenbus_xs.c
@@ -44,7 +44,6 @@
 #include <linux/fcntl.h>
 #include <linux/kthread.h>
 #include <linux/rwsem.h>
-#include <linux/module.h>
 #include <linux/mutex.h>
 #include <asm/xen/hypervisor.h>
 #include <xen/xenbus.h>
diff --git a/drivers/xen/xenfs/xensyms.c b/drivers/xen/xenfs/xensyms.c
index a03f261b12d8..c6e2b4a542ea 100644
--- a/drivers/xen/xenfs/xensyms.c
+++ b/drivers/xen/xenfs/xensyms.c
@@ -1,4 +1,3 @@
-#include <linux/module.h>
 #include <linux/init.h>
 #include <linux/seq_file.h>
 #include <linux/fs.h>
-- 
2.6.1

[toc] | [prev] | [next] | [standalone]

#1334416 — Re: [PATCH 1/5] xen: audit usages of module.h ; remove unnecessary instances

On Sun, 14 Feb 2016, Paul Gortmaker wrote:
> Code that uses no modular facilities whatsoever should not be
> sourcing module.h at all, since that header drags in a bunch
> of other headers with it.
> 
> Similarly, code that is not explicitly using modular facilities
> like module_init() but only is declaring module_param setup
> variables should be using moduleparam.h and not the larger
> module.h file for that.
> 
> In making this change, we also uncover an implicit use of BUG()
> in inline fcns within arch/arm/include/asm/xen/hypercall.h so
> we explicitly source <linux/bug.h> for that file now.
> 
> Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
> Cc: Russell King <linux@arm.linux.org.uk>
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
> Cc: David Vrabel <david.vrabel@citrix.com>
> Cc: xen-devel@lists.xenproject.org
> Cc: linux-arm-kernel@lists.infradead.org
> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>


>  arch/arm/include/asm/xen/hypercall.h  | 2 ++
>  drivers/xen/events/events_2l.c        | 1 -
>  drivers/xen/events/events_base.c      | 2 +-
>  drivers/xen/events/events_fifo.c      | 1 -
>  drivers/xen/features.c                | 2 +-
>  drivers/xen/grant-table.c             | 1 -
>  drivers/xen/xen-pciback/conf_space.c  | 2 +-
>  drivers/xen/xen-pciback/pciback_ops.c | 2 +-
>  drivers/xen/xen-pciback/xenbus.c      | 2 +-
>  drivers/xen/xen-selfballoon.c         | 1 -
>  drivers/xen/xenbus/xenbus_xs.c        | 1 -
>  drivers/xen/xenfs/xensyms.c           | 1 -
>  12 files changed, 7 insertions(+), 11 deletions(-)
> 
> diff --git a/arch/arm/include/asm/xen/hypercall.h b/arch/arm/include/asm/xen/hypercall.h
> index d769972db8cb..b6b962d70db9 100644
> --- a/arch/arm/include/asm/xen/hypercall.h
> +++ b/arch/arm/include/asm/xen/hypercall.h
> @@ -33,6 +33,8 @@
>  #ifndef _ASM_ARM_XEN_HYPERCALL_H
>  #define _ASM_ARM_XEN_HYPERCALL_H
>  
> +#include <linux/bug.h>
> +
>  #include <xen/interface/xen.h>
>  #include <xen/interface/sched.h>
>  #include <xen/interface/platform.h>
> diff --git a/drivers/xen/events/events_2l.c b/drivers/xen/events/events_2l.c
> index 7dd46312c180..51b488f5bfe9 100644
> --- a/drivers/xen/events/events_2l.c
> +++ b/drivers/xen/events/events_2l.c
> @@ -9,7 +9,6 @@
>  #include <linux/linkage.h>
>  #include <linux/interrupt.h>
>  #include <linux/irq.h>
> -#include <linux/module.h>
>  
>  #include <asm/sync_bitops.h>
>  #include <asm/xen/hypercall.h>
> diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
> index 524c22146429..488017a0806a 100644
> --- a/drivers/xen/events/events_base.c
> +++ b/drivers/xen/events/events_base.c
> @@ -26,7 +26,7 @@
>  #include <linux/linkage.h>
>  #include <linux/interrupt.h>
>  #include <linux/irq.h>
> -#include <linux/module.h>
> +#include <linux/moduleparam.h>
>  #include <linux/string.h>
>  #include <linux/bootmem.h>
>  #include <linux/slab.h>
> diff --git a/drivers/xen/events/events_fifo.c b/drivers/xen/events/events_fifo.c
> index eff2b88003d9..9289a17712e2 100644
> --- a/drivers/xen/events/events_fifo.c
> +++ b/drivers/xen/events/events_fifo.c
> @@ -36,7 +36,6 @@
>  #include <linux/linkage.h>
>  #include <linux/interrupt.h>
>  #include <linux/irq.h>
> -#include <linux/module.h>
>  #include <linux/smp.h>
>  #include <linux/percpu.h>
>  #include <linux/cpu.h>
> diff --git a/drivers/xen/features.c b/drivers/xen/features.c
> index 99eda169c779..d7d34fdfc993 100644
> --- a/drivers/xen/features.c
> +++ b/drivers/xen/features.c
> @@ -7,7 +7,7 @@
>   */
>  #include <linux/types.h>
>  #include <linux/cache.h>
> -#include <linux/module.h>
> +#include <linux/export.h>
>  
>  #include <asm/xen/hypercall.h>
>  
> diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
> index effbaf91791f..bb36b1e1dbcc 100644
> --- a/drivers/xen/grant-table.c
> +++ b/drivers/xen/grant-table.c
> @@ -33,7 +33,6 @@
>  
>  #define pr_fmt(fmt) "xen:" KBUILD_MODNAME ": " fmt
>  
> -#include <linux/module.h>
>  #include <linux/sched.h>
>  #include <linux/mm.h>
>  #include <linux/slab.h>
> diff --git a/drivers/xen/xen-pciback/conf_space.c b/drivers/xen/xen-pciback/conf_space.c
> index 9c234209d8b5..8e67336f8ddd 100644
> --- a/drivers/xen/xen-pciback/conf_space.c
> +++ b/drivers/xen/xen-pciback/conf_space.c
> @@ -10,7 +10,7 @@
>   */
>  
>  #include <linux/kernel.h>
> -#include <linux/module.h>
> +#include <linux/moduleparam.h>
>  #include <linux/pci.h>
>  #include "pciback.h"
>  #include "conf_space.h"
> diff --git a/drivers/xen/xen-pciback/pciback_ops.c b/drivers/xen/xen-pciback/pciback_ops.c
> index 73dafdc494aa..5ad01f9c24fc 100644
> --- a/drivers/xen/xen-pciback/pciback_ops.c
> +++ b/drivers/xen/xen-pciback/pciback_ops.c
> @@ -6,7 +6,7 @@
>  
>  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
>  
> -#include <linux/module.h>
> +#include <linux/moduleparam.h>
>  #include <linux/wait.h>
>  #include <linux/bitops.h>
>  #include <xen/events.h>
> diff --git a/drivers/xen/xen-pciback/xenbus.c b/drivers/xen/xen-pciback/xenbus.c
> index 4843741e703a..c252eb3f0176 100644
> --- a/drivers/xen/xen-pciback/xenbus.c
> +++ b/drivers/xen/xen-pciback/xenbus.c
> @@ -6,7 +6,7 @@
>  
>  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
>  
> -#include <linux/module.h>
> +#include <linux/moduleparam.h>
>  #include <linux/init.h>
>  #include <linux/list.h>
>  #include <linux/vmalloc.h>
> diff --git a/drivers/xen/xen-selfballoon.c b/drivers/xen/xen-selfballoon.c
> index 3b2bffde534f..53a085fca00c 100644
> --- a/drivers/xen/xen-selfballoon.c
> +++ b/drivers/xen/xen-selfballoon.c
> @@ -71,7 +71,6 @@
>  #include <linux/swap.h>
>  #include <linux/mm.h>
>  #include <linux/mman.h>
> -#include <linux/module.h>
>  #include <linux/workqueue.h>
>  #include <linux/device.h>
>  #include <xen/balloon.h>
> diff --git a/drivers/xen/xenbus/xenbus_xs.c b/drivers/xen/xenbus/xenbus_xs.c
> index ba804f3d8278..374b12af8812 100644
> --- a/drivers/xen/xenbus/xenbus_xs.c
> +++ b/drivers/xen/xenbus/xenbus_xs.c
> @@ -44,7 +44,6 @@
>  #include <linux/fcntl.h>
>  #include <linux/kthread.h>
>  #include <linux/rwsem.h>
> -#include <linux/module.h>
>  #include <linux/mutex.h>
>  #include <asm/xen/hypervisor.h>
>  #include <xen/xenbus.h>
> diff --git a/drivers/xen/xenfs/xensyms.c b/drivers/xen/xenfs/xensyms.c
> index a03f261b12d8..c6e2b4a542ea 100644
> --- a/drivers/xen/xenfs/xensyms.c
> +++ b/drivers/xen/xenfs/xensyms.c
> @@ -1,4 +1,3 @@
> -#include <linux/module.h>
>  #include <linux/init.h>
>  #include <linux/seq_file.h>
>  #include <linux/fs.h>
> -- 
> 2.6.1
> 

[toc] | [prev] | [standalone]

Back to top | Article view | linux.kernel

csiph-web