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Date: Tue, 26 Mar 2024 18:49:25 +0000
From: Conor Dooley <conor@...nel.org>
To: Sami Tolvanen <samitolvanen@...gle.com>
Cc: Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Kees Cook <keescook@...omium.org>, linux-riscv@...ts.infradead.org,
llvm@...ts.linux.dev, linux-kernel@...r.kernel.org,
Linux Kernel Functional Testing <lkft@...aro.org>
Subject: Re: [PATCH] riscv: Mark __se_sys_* functions __used
On Tue, Mar 26, 2024 at 03:37:13PM +0000, Sami Tolvanen 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.
>
> Mark the functions __used explicitly to fix the Clang warnings.
>
> Fixes: a9ad73295cc1 ("riscv: Fix syscall wrapper for >word-size arguments")
> Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
> Tested-by: Linux Kernel Functional Testing <lkft@...aro.org>
> Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
Oh neat, thanks. This was generating a shed load of noise in CI :)
Tested-by: Conor Dooley <conor.dooley@...rochip.com>
Thanks,
Conor.
> ---
> arch/riscv/include/asm/syscall_wrapper.h | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/arch/riscv/include/asm/syscall_wrapper.h b/arch/riscv/include/asm/syscall_wrapper.h
> index 980094c2e976..ac80216549ff 100644
> --- a/arch/riscv/include/asm/syscall_wrapper.h
> +++ b/arch/riscv/include/asm/syscall_wrapper.h
> @@ -36,7 +36,8 @@ asmlinkage long __riscv_sys_ni_syscall(const struct pt_regs *);
> ulong) \
> __attribute__((alias(__stringify(___se_##prefix##name)))); \
> __diag_pop(); \
> - static long noinline ___se_##prefix##name(__MAP(x,__SC_LONG,__VA_ARGS__)); \
> + static long noinline ___se_##prefix##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
> + __used; \
> static long ___se_##prefix##name(__MAP(x,__SC_LONG,__VA_ARGS__))
>
> #define SC_RISCV_REGS_TO_ARGS(x, ...) \
>
> base-commit: 4cece764965020c22cff7665b18a012006359095
> --
> 2.44.0.396.g6e790dbe36-goog
>
>
> _______________________________________________
> linux-riscv mailing list
> linux-riscv@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv
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