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linux-next: build failure after merge of the char-misc tree

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  linux-next: build failure after merge of the char-misc tree Stephen Rothwell <sfr@canb.auug.org.au> - 2017-03-20 03:50 +0100
    Re: linux-next: build failure after merge of the char-misc tree Arnd Bergmann <arnd@arndb.de> - 2017-03-20 13:30 +0100
      Re: linux-next: build failure after merge of the char-misc tree Benjamin Herrenschmidt <benh@kernel.crashing.org> - 2017-03-21 01:20 +0100
        Re: linux-next: build failure after merge of the char-misc tree Cyril Bur <cyrilbur@gmail.com> - 2017-03-21 01:40 +0100
          Re: linux-next: build failure after merge of the char-misc tree Joel Stanley <joel@jms.id.au> - 2017-03-21 04:10 +0100

#1604153 — linux-next: build failure after merge of the char-misc tree

Hi all,

After merging the char-misc tree, today's linux-next build (x86_64
allmodconfig) failed like this:

drivers/misc/aspeed-lpc-ctrl.c: In function 'aspeed_lpc_ctrl_mmap':
drivers/misc/aspeed-lpc-ctrl.c:51:9: error: implicit declaration of function 'pgprot_dmacoherent' [-Werror=implicit-function-declaration]
  prot = pgprot_dmacoherent(prot);
         ^
drivers/misc/aspeed-lpc-ctrl.c:51:7: error: incompatible types when assigning to type 'pgprot_t {aka struct pgprot}' from type 'int'
  prot = pgprot_dmacoherent(prot);
       ^
In file included from include/linux/miscdevice.h:6:0,
                 from drivers/misc/aspeed-lpc-ctrl.c:11:
drivers/misc/aspeed-lpc-ctrl.c: In function 'aspeed_lpc_ctrl_probe':
drivers/misc/aspeed-lpc-ctrl.c:232:17: warning: format '%x' expects argument of type 'unsigned int', but argument 3 has type 'phys_addr_t {aka long long unsigned int}' [-Wformat=]
   dev_info(dev, "Loaded at 0x%08x (0x%08x)\n",
                 ^
include/linux/device.h:1317:51: note: in definition of macro 'dev_info'
 #define dev_info(dev, fmt, arg...) _dev_info(dev, fmt, ##arg)
                                                   ^
drivers/misc/aspeed-lpc-ctrl.c:232:17: warning: format '%x' expects argument of type 'unsigned int', but argument 4 has type 'resource_size_t {aka long long unsigned int}' [-Wformat=]
   dev_info(dev, "Loaded at 0x%08x (0x%08x)\n",
                 ^
include/linux/device.h:1317:51: note: in definition of macro 'dev_info'
 #define dev_info(dev, fmt, arg...) _dev_info(dev, fmt, ##arg)
                                                   ^

Caused by commit

  6c4e97678501 ("drivers/misc: Add Aspeed LPC control driver")

Clearly this will only build on arm :-(  You can only use COMPILE_TEST
if you can reasonably expect the build to work on all architectures
and platforms.

I have added the following patch for today (the warnings should be fixed as well):

From: Stephen Rothwell <sfr@canb.auug.org.au>
Date: Mon, 20 Mar 2017 13:38:10 +1100
Subject: [PATCH] drivers/misc: Aspeed LPC control driver will only build on arm

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
---
 drivers/misc/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index fb933b0b9297..52a46b129214 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -773,7 +773,7 @@ config PANEL_BOOT_MESSAGE
 endif # PANEL
 
 config ASPEED_LPC_CTRL
-	depends on (ARCH_ASPEED || COMPILE_TEST) && REGMAP && MFD_SYSCON
+	depends on ARCH_ASPEED && REGMAP && MFD_SYSCON
 	tristate "Aspeed ast2400/2500 HOST LPC to BMC bridge control"
 	---help---
 	  Control Aspeed ast2400/2500 HOST LPC to BMC mappings through
-- 
2.11.0

-- 
Cheers,
Stephen Rothwell

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#1604464

On Mon, Mar 20, 2017 at 3:44 AM, Stephen Rothwell <sfr@canb.auug.org.au> wrote:
> Hi all,
>
> After merging the char-misc tree, today's linux-next build (x86_64
> allmodconfig) failed like this:
>
> drivers/misc/aspeed-lpc-ctrl.c: In function 'aspeed_lpc_ctrl_mmap':
> drivers/misc/aspeed-lpc-ctrl.c:51:9: error: implicit declaration of function 'pgprot_dmacoherent' [-Werror=implicit-function-declaration]
>   prot = pgprot_dmacoherent(prot);

A lot of other drivers (including /dev/mem) just use pgprot_noncached() or
pgprot_writecombine(), which would make the code portable and might be
what you want here as well.

pgprot_dmacoherent() is meant specifically for mapping RAM that is used
for DMA buffers that come from dma_alloc_coherent(), which doesn't seem
to be the case here.

What kind of address range is this really?

> drivers/misc/aspeed-lpc-ctrl.c:51:7: error: incompatible types when assigning to type 'pgprot_t {aka struct pgprot}' from type 'int'
>   prot = pgprot_dmacoherent(prot);
>        ^
> In file included from include/linux/miscdevice.h:6:0,
>                  from drivers/misc/aspeed-lpc-ctrl.c:11:
> drivers/misc/aspeed-lpc-ctrl.c: In function 'aspeed_lpc_ctrl_probe':
> drivers/misc/aspeed-lpc-ctrl.c:232:17: warning: format '%x' expects argument of type 'unsigned int', but argument 3 has type 'phys_addr_t {aka long long unsigned int}' [-Wformat=]
>    dev_info(dev, "Loaded at 0x%08x (0x%08x)\n",

This should just use the "%pap" for printing a phys_addr_t, otherwise we
get the same warning on ARM in some configurations.

      Arnd

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#1605215

On Mon, 2017-03-20 at 13:23 +0100, Arnd Bergmann wrote:
> On Mon, Mar 20, 2017 at 3:44 AM, Stephen Rothwell <sfr@canb.auug.org.au> wrote:
> > Hi all,
> > 
> > After merging the char-misc tree, today's linux-next build (x86_64
> > allmodconfig) failed like this:
> > 
> > drivers/misc/aspeed-lpc-ctrl.c: In function 'aspeed_lpc_ctrl_mmap':
> > drivers/misc/aspeed-lpc-ctrl.c:51:9: error: implicit declaration of function 'pgprot_dmacoherent' [-Werror=implicit-function-declaration]
> >   prot = pgprot_dmacoherent(prot);
> 
> A lot of other drivers (including /dev/mem) just use pgprot_noncached() or
> pgprot_writecombine(), which would make the code portable and might be
> what you want here as well.
> 
> pgprot_dmacoherent() is meant specifically for mapping RAM that is used
> for DMA buffers that come from dma_alloc_coherent(), which doesn't seem
> to be the case here.
> 
> What kind of address range is this really?

It's a piece of RAM that we reserve via a reserved region, which will
be accessed by HW (sort-of-DMA, ie, the "host" system will access that
using FW cycles on the LPC bus which we map to that reserved region of
memory).

Joel, Cyril, can you send a 1-liner patch to change that to
pgprot_noncached() ?

Cheers,
Ben.

> > drivers/misc/aspeed-lpc-ctrl.c:51:7: error: incompatible types when assigning to type 'pgprot_t {aka struct pgprot}' from type 'int'
> >   prot = pgprot_dmacoherent(prot);
> >        ^
> > In file included from include/linux/miscdevice.h:6:0,
> >                  from drivers/misc/aspeed-lpc-ctrl.c:11:
> > drivers/misc/aspeed-lpc-ctrl.c: In function 'aspeed_lpc_ctrl_probe':
> > drivers/misc/aspeed-lpc-ctrl.c:232:17: warning: format '%x' expects argument of type 'unsigned int', but argument 3 has type 'phys_addr_t {aka long long unsigned int}' [-Wformat=]
> >    dev_info(dev, "Loaded at 0x%08x (0x%08x)\n",
> 
> This should just use the "%pap" for printing a phys_addr_t, otherwise we
> get the same warning on ARM in some configurations.
> 
>       Arnd

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#1605221

On Tue, 2017-03-21 at 11:18 +1100, Benjamin Herrenschmidt wrote:
> On Mon, 2017-03-20 at 13:23 +0100, Arnd Bergmann wrote:
> > On Mon, Mar 20, 2017 at 3:44 AM, Stephen Rothwell <sfr@canb.auug.org.au> wrote:
> > > Hi all,
> > > 
> > > After merging the char-misc tree, today's linux-next build (x86_64
> > > allmodconfig) failed like this:
> > > 
> > > drivers/misc/aspeed-lpc-ctrl.c: In function 'aspeed_lpc_ctrl_mmap':
> > > drivers/misc/aspeed-lpc-ctrl.c:51:9: error: implicit declaration of function 'pgprot_dmacoherent' [-Werror=implicit-function-declaration]
> > >   prot = pgprot_dmacoherent(prot);
> > 
> > A lot of other drivers (including /dev/mem) just use pgprot_noncached() or
> > pgprot_writecombine(), which would make the code portable and might be
> > what you want here as well.
> > 
> > pgprot_dmacoherent() is meant specifically for mapping RAM that is used
> > for DMA buffers that come from dma_alloc_coherent(), which doesn't seem
> > to be the case here.
> > 
> > What kind of address range is this really?
> 
> It's a piece of RAM that we reserve via a reserved region, which will
> be accessed by HW (sort-of-DMA, ie, the "host" system will access that
> using FW cycles on the LPC bus which we map to that reserved region of
> memory).
> 
> Joel, Cyril, can you send a 1-liner patch to change that to
> pgprot_noncached() ?
> 

Sure. Just to be clear - we want to keep COMPILE_TEST in kconfig?

Also I can't help but notice this: 
https://lists.ozlabs.org/pipermail/openbmc/2017-January/006219.html
[v3 of the series]
vs
https://lists.ozlabs.org/pipermail/openbmc/2017-February/006462.html
[v4 of the series]


> Cheers,
> Ben.
> 
> > > drivers/misc/aspeed-lpc-ctrl.c:51:7: error: incompatible types when assigning to type 'pgprot_t {aka struct pgprot}' from type 'int'
> > >   prot = pgprot_dmacoherent(prot);
> > >        ^
> > > In file included from include/linux/miscdevice.h:6:0,
> > >                  from drivers/misc/aspeed-lpc-ctrl.c:11:
> > > drivers/misc/aspeed-lpc-ctrl.c: In function 'aspeed_lpc_ctrl_probe':
> > > drivers/misc/aspeed-lpc-ctrl.c:232:17: warning: format '%x' expects argument of type 'unsigned int', but argument 3 has type 'phys_addr_t {aka long long unsigned int}' [-Wformat=]
> > >    dev_info(dev, "Loaded at 0x%08x (0x%08x)\n",
> > 
> > This should just use the "%pap" for printing a phys_addr_t, otherwise we
> > get the same warning on ARM in some configurations.

Thanks Arnd, I'll address that too.

> > 
> >       Arnd

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#1605270

On Tue, Mar 21, 2017 at 11:06 AM, Cyril Bur <cyrilbur@gmail.com> wrote:
> On Tue, 2017-03-21 at 11:18 +1100, Benjamin Herrenschmidt wrote:
>> On Mon, 2017-03-20 at 13:23 +0100, Arnd Bergmann wrote:
>> > On Mon, Mar 20, 2017 at 3:44 AM, Stephen Rothwell <sfr@canb.auug.org.au> wrote:
>> > > Hi all,
>> > >
>> > > After merging the char-misc tree, today's linux-next build (x86_64
>> > > allmodconfig) failed like this:
>> > >
>> > > drivers/misc/aspeed-lpc-ctrl.c: In function 'aspeed_lpc_ctrl_mmap':
>> > > drivers/misc/aspeed-lpc-ctrl.c:51:9: error: implicit declaration of function 'pgprot_dmacoherent' [-Werror=implicit-function-declaration]
>> > >   prot = pgprot_dmacoherent(prot);
>> >
>> > A lot of other drivers (including /dev/mem) just use pgprot_noncached() or
>> > pgprot_writecombine(), which would make the code portable and might be
>> > what you want here as well.
>> >
>> > pgprot_dmacoherent() is meant specifically for mapping RAM that is used
>> > for DMA buffers that come from dma_alloc_coherent(), which doesn't seem
>> > to be the case here.
>> >
>> > What kind of address range is this really?
>>
>> It's a piece of RAM that we reserve via a reserved region, which will
>> be accessed by HW (sort-of-DMA, ie, the "host" system will access that
>> using FW cycles on the LPC bus which we map to that reserved region of
>> memory).
>>
>> Joel, Cyril, can you send a 1-liner patch to change that to
>> pgprot_noncached() ?
>>
>
> Sure. Just to be clear - we want to keep COMPILE_TEST in kconfig?

Yep. With the change that Ben suggested we should be ok.

pgprot_noncached has a fall back definition in
include/asm-generic/pgtable.h, so all platforms will compile.

Cheers,

Joel

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