[PATCH] [v3] arm64/io: add constant-argument check

[Will Deacon]

On Tue, 04 Jun 2024 22:59:57 +0200, Arnd Bergmann wrote:
> In some configurations __const_iowrite32_copy() does not get inlined
> and gcc runs into the BUILD_BUG():
> 
> In file included from <command-line>:
> In function '__const_memcpy_toio_aligned32',
>     inlined from '__const_iowrite32_copy' at arch/arm64/include/asm/io.h:203:3,
>     inlined from '__const_iowrite32_copy' at arch/arm64/include/asm/io.h:199:20:
> include/linux/compiler_types.h:487:45: error: call to '__compiletime_assert_538' declared with attribute error: BUILD_BUG failed
>   487 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>       |                                             ^
> include/linux/compiler_types.h:468:25: note: in definition of macro '__compiletime_assert'
>   468 |                         prefix ## suffix();                             \
>       |                         ^~~~~~
> include/linux/compiler_types.h:487:9: note: in expansion of macro '_compiletime_assert'
>   487 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>       |         ^~~~~~~~~~~~~~~~~~~
> include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
>    39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
>       |                                     ^~~~~~~~~~~~~~~~~~
> include/linux/build_bug.h:59:21: note: in expansion of macro 'BUILD_BUG_ON_MSG'
>    59 | #define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed")
>       |                     ^~~~~~~~~~~~~~~~
> arch/arm64/include/asm/io.h:193:17: note: in expansion of macro 'BUILD_BUG'
>   193 |                 BUILD_BUG();
>       |                 ^~~~~~~~~
> 
> [...]

Applied to arm64 (for-next/fixes), thanks!

[1/1] arm64/io: add constant-argument check
      https://git.kernel.org/arm64/c/5c40e428aea6

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
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