diff mbox series

[4/4] vdso: avoid including asm/page.h

Message ID 20240226161414.2316610-5-arnd@kernel.org
State New
Headers
Series arch: mm, vdso: consolidate PAGE_SIZE definition |

Commit Message

Arnd Bergmann Feb. 26, 2024, 4:14 p.m. UTC 
  From: Arnd Bergmann <arnd@arndb.de>

The recent change to the vdso_data_store broke building compat VDSO
on at least arm64 because it includes headers outside of the include/vdso/
namespace:

In file included from arch/arm64/include/asm/lse.h:5,
                 from arch/arm64/include/asm/cmpxchg.h:14,
                 from arch/arm64/include/asm/atomic.h:16,
                 from include/linux/atomic.h:7,
                 from include/asm-generic/bitops/atomic.h:5,
                 from arch/arm64/include/asm/bitops.h:25,
                 from include/linux/bitops.h:68,
                 from arch/arm64/include/asm/memory.h:209,
                 from arch/arm64/include/asm/page.h:46,
                 from include/vdso/datapage.h:22,
                 from lib/vdso/gettimeofday.c:5,
                 from <command-line>:
arch/arm64/include/asm/atomic_ll_sc.h:298:9: error: unknown type name 'u128'
  298 |         u128 full;

Use an open-coded page size calculation based on the new CONFIG_PAGE_SHIFT
Kconfig symbol instead.

Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
Fixes: a0d2fcd62ac2 ("vdso/ARM: Make union vdso_data_store available for all architectures")
Link: https://lore.kernel.org/lkml/CA+G9fYtrXXm_KO9fNPz3XaRxHV7UD_yQp-TEuPQrNRHU+_0W_Q@mail.gmail.com/
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 include/vdso/datapage.h | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

Comments

Christophe Leroy Feb. 26, 2024, 6:53 p.m. UTC | #1 
Le 26/02/2024 à 17:14, Arnd Bergmann a écrit :
> From: Arnd Bergmann <arnd@arndb.de>
> 
> The recent change to the vdso_data_store broke building compat VDSO
> on at least arm64 because it includes headers outside of the include/vdso/
> namespace:

I understand that powerpc64 also has an issue, see 
https://patchwork.ozlabs.org/project/linuxppc-dev/patch/20231221120410.2226678-1-mpe@ellerman.id.au/

> 
> In file included from arch/arm64/include/asm/lse.h:5,
>                   from arch/arm64/include/asm/cmpxchg.h:14,
>                   from arch/arm64/include/asm/atomic.h:16,
>                   from include/linux/atomic.h:7,
>                   from include/asm-generic/bitops/atomic.h:5,
>                   from arch/arm64/include/asm/bitops.h:25,
>                   from include/linux/bitops.h:68,
>                   from arch/arm64/include/asm/memory.h:209,
>                   from arch/arm64/include/asm/page.h:46,
>                   from include/vdso/datapage.h:22,
>                   from lib/vdso/gettimeofday.c:5,
>                   from <command-line>:
> arch/arm64/include/asm/atomic_ll_sc.h:298:9: error: unknown type name 'u128'
>    298 |         u128 full;
> 
> Use an open-coded page size calculation based on the new CONFIG_PAGE_SHIFT
> Kconfig symbol instead.
> 
> Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
> Fixes: a0d2fcd62ac2 ("vdso/ARM: Make union vdso_data_store available for all architectures")
> Link: https://lore.kernel.org/lkml/CA+G9fYtrXXm_KO9fNPz3XaRxHV7UD_yQp-TEuPQrNRHU+_0W_Q@mail.gmail.com/
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>   include/vdso/datapage.h | 4 +---
>   1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/include/vdso/datapage.h b/include/vdso/datapage.h
> index 7ba44379a095..2c39a67d7e23 100644
> --- a/include/vdso/datapage.h
> +++ b/include/vdso/datapage.h
> @@ -19,8 +19,6 @@
>   #include <vdso/time32.h>
>   #include <vdso/time64.h>
>   
> -#include <asm/page.h>
> -
>   #ifdef CONFIG_ARCH_HAS_VDSO_DATA
>   #include <asm/vdso/data.h>
>   #else
> @@ -128,7 +126,7 @@ extern struct vdso_data _timens_data[CS_BASES] __attribute__((visibility("hidden
>    */
>   union vdso_data_store {
>   	struct vdso_data	data[CS_BASES];
> -	u8			page[PAGE_SIZE];
> +	u8			page[1ul << CONFIG_PAGE_SHIFT];

Usually 1UL is used (capital letter)

Maybe better to (re)define PAGE_SIZE instead, something like:

#define PAGE_SIZE (1UL << CONFIG_PAGE_SHIFT)


>   };
>   
>   /*
Michael Ellerman Feb. 27, 2024, 12:57 p.m. UTC | #2 
Christophe Leroy <christophe.leroy@csgroup.eu> writes:
> Le 26/02/2024 à 17:14, Arnd Bergmann a écrit :
>> From: Arnd Bergmann <arnd@arndb.de>
>> 
>> The recent change to the vdso_data_store broke building compat VDSO
>> on at least arm64 because it includes headers outside of the include/vdso/
>> namespace:
>
> I understand that powerpc64 also has an issue, see 
> https://patchwork.ozlabs.org/project/linuxppc-dev/patch/20231221120410.2226678-1-mpe@ellerman.id.au/

Yeah, and that patch would silently conflict with this series, which is
not ideal.

I could delay merging my patch above until after this series goes in,
mine only fixes a fairly obscure build warning.

cheers
Catalin Marinas Feb. 27, 2024, 1:46 p.m. UTC | #3 
On Mon, Feb 26, 2024 at 05:14:14PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> The recent change to the vdso_data_store broke building compat VDSO
> on at least arm64 because it includes headers outside of the include/vdso/
> namespace:
> 
> In file included from arch/arm64/include/asm/lse.h:5,
>                  from arch/arm64/include/asm/cmpxchg.h:14,
>                  from arch/arm64/include/asm/atomic.h:16,
>                  from include/linux/atomic.h:7,
>                  from include/asm-generic/bitops/atomic.h:5,
>                  from arch/arm64/include/asm/bitops.h:25,
>                  from include/linux/bitops.h:68,
>                  from arch/arm64/include/asm/memory.h:209,
>                  from arch/arm64/include/asm/page.h:46,
>                  from include/vdso/datapage.h:22,
>                  from lib/vdso/gettimeofday.c:5,
>                  from <command-line>:
> arch/arm64/include/asm/atomic_ll_sc.h:298:9: error: unknown type name 'u128'
>   298 |         u128 full;
> 
> Use an open-coded page size calculation based on the new CONFIG_PAGE_SHIFT
> Kconfig symbol instead.
> 
> Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
> Fixes: a0d2fcd62ac2 ("vdso/ARM: Make union vdso_data_store available for all architectures")
> Link: https://lore.kernel.org/lkml/CA+G9fYtrXXm_KO9fNPz3XaRxHV7UD_yQp-TEuPQrNRHU+_0W_Q@mail.gmail.com/
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
diff mbox series

Patch

diff --git a/include/vdso/datapage.h b/include/vdso/datapage.h
index 7ba44379a095..2c39a67d7e23 100644
--- a/include/vdso/datapage.h
+++ b/include/vdso/datapage.h
@@ -19,8 +19,6 @@ 
 #include <vdso/time32.h>
 #include <vdso/time64.h>
 
-#include <asm/page.h>
-
 #ifdef CONFIG_ARCH_HAS_VDSO_DATA
 #include <asm/vdso/data.h>
 #else
@@ -128,7 +126,7 @@  extern struct vdso_data _timens_data[CS_BASES] __attribute__((visibility("hidden
  */
 union vdso_data_store {
 	struct vdso_data	data[CS_BASES];
-	u8			page[PAGE_SIZE];
+	u8			page[1ul << CONFIG_PAGE_SHIFT];
 };
 
 /*