linux-kernel - Re: [PATCH] riscv: Mark __se_sys_* functions _

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Date: Wed, 27 Mar 2024 14:00:29 +0000
From: patchwork-bot+linux-riscv@...nel.org
To: Sami Tolvanen <samitolvanen@...gle.com>
Cc: linux-riscv@...ts.infradead.org, paul.walmsley@...ive.com,
 palmer@...belt.com, aou@...s.berkeley.edu, keescook@...omium.org,
 llvm@...ts.linux.dev, linux-kernel@...r.kernel.org, lkft@...aro.org
Subject: Re: [PATCH] riscv: Mark __se_sys_* functions __used

Hello:

This patch was applied to riscv/linux.git (fixes)
by Palmer Dabbelt <palmer@...osinc.com>:

On Tue, 26 Mar 2024 15:37:13 +0000 you wrote:
> Clang doesn't think ___se_sys_* functions used even though they are
> aliased to __se_sys_*, resulting in -Wunused-function warnings when
> building rv32. For example:
> 
>    mm/oom_kill.c:1195:1: warning: unused function '___se_sys_process_mrelease' [-Wunused-function]
>     1195 | SYSCALL_DEFINE2(process_mrelease, int, pidfd, unsigned int, flags)
>          | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    include/linux/syscalls.h:221:36: note: expanded from macro 'SYSCALL_DEFINE2'
>      221 | #define SYSCALL_DEFINE2(name, ...) SYSCALL_DEFINEx(2, _##name, __VA_ARGS__)
>          |                                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    include/linux/syscalls.h:231:2: note: expanded from macro 'SYSCALL_DEFINEx'
>      231 |         __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
>          |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    arch/riscv/include/asm/syscall_wrapper.h:81:2: note: expanded from macro '__SYSCALL_DEFINEx'
>       81 |         __SYSCALL_SE_DEFINEx(x, sys, name, __VA_ARGS__)                         \
>          |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    arch/riscv/include/asm/syscall_wrapper.h:40:14: note: expanded from macro '__SYSCALL_SE_DEFINEx'
>       40 |         static long ___se_##prefix##name(__MAP(x,__SC_LONG,__VA_ARGS__))
>          |                     ^~~~~~~~~~~~~~~~~~~~
>    <scratch space>:30:1: note: expanded from here
>       30 | ___se_sys_process_mrelease
>          | ^~~~~~~~~~~~~~~~~~~~~~~~~~
>    1 warning generated.
> 
> [...]

Here is the summary with links:
  - riscv: Mark __se_sys_* functions __used
    https://git.kernel.org/riscv/c/653650c468be

You are awesome, thank you!
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