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[PATCH 2/3] kbuild: Allow to specify composite modules with modname-m

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  [PATCH 2/3] kbuild: Allow to specify composite modules with modname-m Michal Marek <mmarek@suse.cz> - 2015-10-28 14:30 +0100
    Re: [PATCH 2/3] kbuild: Allow to specify composite modules with  modname-m Michal Marek <mmarek@suse.cz> - 2015-10-29 09:10 +0100

#1258017 — [PATCH 2/3] kbuild: Allow to specify composite modules with modname-m

From: Michal Marek <mmarek@suse.com>

This allows to write

  drm-$(CONFIG_AGP) += drm_agpsupport.o

without having to handle CONFIG_AGP=y vs. CONFIG_AGP=m. Only support
this syntax for modules, since built-in code depending on something
modular cannot work and init/Makefile actually relies on the current
semantics. There are a few drivers which adapted to the current
semantics out of necessity; these are fixed to also work when the
respective subsystem is modular.

Cc: Peter Chen <Peter.Chen@freescale.com>
Cc: linux-usb@vger.kernel.org
Cc: Joern Engel <joern@logfs.org>
Cc: Prasad Joshi <prasadjoshi.linux@gmail.com>
Cc: logfs@logfs.org
Signed-off-by: Michal Marek <mmarek@suse.com>
---
 drivers/misc/ibmasm/ibmasm.h   | 2 +-
 drivers/usb/chipidea/otg_fsm.h | 2 +-
 fs/logfs/logfs.h               | 2 +-
 scripts/Makefile.build         | 8 ++++++--
 scripts/Makefile.lib           | 4 ++--
 5 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/misc/ibmasm/ibmasm.h b/drivers/misc/ibmasm/ibmasm.h
index 9b08344..5bd1277 100644
--- a/drivers/misc/ibmasm/ibmasm.h
+++ b/drivers/misc/ibmasm/ibmasm.h
@@ -211,7 +211,7 @@ void ibmasmfs_unregister(void);
 void ibmasmfs_add_sp(struct service_processor *sp);
 
 /* uart */
-#ifdef CONFIG_SERIAL_8250
+#if IS_ENABLED(CONFIG_SERIAL_8250)
 void ibmasm_register_uart(struct service_processor *sp);
 void ibmasm_unregister_uart(struct service_processor *sp);
 #else
diff --git a/drivers/usb/chipidea/otg_fsm.h b/drivers/usb/chipidea/otg_fsm.h
index 2689375..262d6ef 100644
--- a/drivers/usb/chipidea/otg_fsm.h
+++ b/drivers/usb/chipidea/otg_fsm.h
@@ -62,7 +62,7 @@
 /* SSEND time before SRP */
 #define TB_SSEND_SRP         (1500)	/* minimum 1.5 sec, section:5.1.2 */
 
-#ifdef CONFIG_USB_OTG_FSM
+#if IS_ENABLED(CONFIG_USB_OTG_FSM)
 
 int ci_hdrc_otg_fsm_init(struct ci_hdrc *ci);
 int ci_otg_fsm_work(struct ci_hdrc *ci);
diff --git a/fs/logfs/logfs.h b/fs/logfs/logfs.h
index 5f09376..23f961a 100644
--- a/fs/logfs/logfs.h
+++ b/fs/logfs/logfs.h
@@ -485,7 +485,7 @@ static inline int logfs_get_sb_bdev(struct logfs_super *s,
 #endif
 
 /* dev_mtd.c */
-#ifdef CONFIG_MTD
+#if IS_ENABLED(CONFIG_MTD)
 int logfs_get_sb_mtd(struct logfs_super *s, int mtdnr);
 #else
 static inline int logfs_get_sb_mtd(struct logfs_super *s, int mtdnr)
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 01df30a..2c47f9c 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -372,10 +372,14 @@ endif
 #    <composite-object>-objs := <list of .o files>
 #  or
 #    <composite-object>-y    := <list of .o files>
+#  or
+#    <composite-object>-m    := <list of .o files>
+#  The -m syntax only works if <composite object> is a module
 link_multi_deps =                     \
 $(filter $(addprefix $(obj)/,         \
 $($(subst $(obj)/,,$(@:.o=-objs)))    \
-$($(subst $(obj)/,,$(@:.o=-y)))), $^)
+$($(subst $(obj)/,,$(@:.o=-y)))       \
+$($(subst $(obj)/,,$(@:.o=-m)))), $^)
 
 quiet_cmd_link_multi-y = LD      $@
 cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
@@ -390,7 +394,7 @@ $(call multi_depend, $(multi-used-y), .o, -objs -y)
 $(multi-used-m): FORCE
 	$(call if_changed,link_multi-m)
 	@{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
-$(call multi_depend, $(multi-used-m), .o, -objs -y)
+$(call multi_depend, $(multi-used-m), .o, -objs -y -m)
 
 targets += $(multi-used-y) $(multi-used-m)
 
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 79e8661..e18957b 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -48,7 +48,7 @@ subdir-ym	:= $(sort $(subdir-y) $(subdir-m))
 
 # if $(foo-objs) exists, foo.o is a composite object
 multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
-multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
+multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))), $(m))))
 multi-used   := $(multi-used-y) $(multi-used-m)
 single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
 
@@ -67,7 +67,7 @@ obj-dirs := $(dir $(multi-objs) $(obj-y))
 
 # Replace multi-part objects by their individual parts, look at local dir only
 real-objs-y := $(foreach m, $(filter-out $(subdir-obj-y), $(obj-y)), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) $(extra-y)
-real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
+real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)),$(m)))
 
 # Add subdir path
 
-- 
1.9.2

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#1258628 — Re: [PATCH 2/3] kbuild: Allow to specify composite modules with modname-m

Dne 29.10.2015 v 07:34 Peter Chen napsal(a):
> On Wed, Oct 28, 2015 at 02:25:41PM +0100, Michal Marek wrote:
>> From: Michal Marek <mmarek@suse.com>
>>
>> This allows to write
>>
>>   drm-$(CONFIG_AGP) += drm_agpsupport.o
>>
>> without having to handle CONFIG_AGP=y vs. CONFIG_AGP=m. Only support
>> this syntax for modules, since built-in code depending on something
>> modular cannot work and init/Makefile actually relies on the current
>> semantics. There are a few drivers which adapted to the current
>> semantics out of necessity; these are fixed to also work when the
>> respective subsystem is modular.
>>
>> Cc: Peter Chen <Peter.Chen@freescale.com>
>> Cc: linux-usb@vger.kernel.org
>> Cc: Joern Engel <joern@logfs.org>
>> Cc: Prasad Joshi <prasadjoshi.linux@gmail.com>
>> Cc: logfs@logfs.org
>> Signed-off-by: Michal Marek <mmarek@suse.com>
>> ---
>>  drivers/misc/ibmasm/ibmasm.h   | 2 +-
>>  drivers/usb/chipidea/otg_fsm.h | 2 +-
>>  fs/logfs/logfs.h               | 2 +-
>>  scripts/Makefile.build         | 8 ++++++--
>>  scripts/Makefile.lib           | 4 ++--
>>  5 files changed, 11 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/misc/ibmasm/ibmasm.h b/drivers/misc/ibmasm/ibmasm.h
>> index 9b08344..5bd1277 100644
>> --- a/drivers/misc/ibmasm/ibmasm.h
>> +++ b/drivers/misc/ibmasm/ibmasm.h
>> @@ -211,7 +211,7 @@ void ibmasmfs_unregister(void);
>>  void ibmasmfs_add_sp(struct service_processor *sp);
>>  
>>  /* uart */
>> -#ifdef CONFIG_SERIAL_8250
>> +#if IS_ENABLED(CONFIG_SERIAL_8250)
>>  void ibmasm_register_uart(struct service_processor *sp);
>>  void ibmasm_unregister_uart(struct service_processor *sp);
>>  #else
>> diff --git a/drivers/usb/chipidea/otg_fsm.h b/drivers/usb/chipidea/otg_fsm.h
>> index 2689375..262d6ef 100644
>> --- a/drivers/usb/chipidea/otg_fsm.h
>> +++ b/drivers/usb/chipidea/otg_fsm.h
>> @@ -62,7 +62,7 @@
>>  /* SSEND time before SRP */
>>  #define TB_SSEND_SRP         (1500)	/* minimum 1.5 sec, section:5.1.2 */
>>  
>> -#ifdef CONFIG_USB_OTG_FSM
>> +#if IS_ENABLED(CONFIG_USB_OTG_FSM)
> 
> Does it mean if the configuration is tristate, it must use IS_ENABLED?

IS_ENABLED is a shortcut for defined(CONFIG_FOO) ||
defined(CONFIG_FOO_MODULE). In other words, it makes sure the that otg
fsm functions are used for both CONFIG_USB_OTG_FSM=y and
CONFIG_USB_OTG_FSM=m.

Michal

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