linux-kernel - Re: [PATCH] riscv: Fix build with CONFIG_CC_OPTIMIZE_FOR

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Message-Id: <167523607081.29266.3967297527966644183.b4-ty@rivosinc.com>
Date:   Tue, 31 Jan 2023 23:21:10 -0800
From:   Palmer Dabbelt <palmer@...osinc.com>
To:     Palmer Dabbelt <palmer@...belt.com>,
        Samuel Holland <samuel@...lland.org>,
        linux-riscv@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, Dao Lu <daolu@...osinc.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Heiko Stuebner <heiko@...ech.de>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Anup Patel <anup@...infault.org>,
        Jisheng Zhang <jszhang@...nel.org>,
        Atish Patra <atishp@...osinc.com>, Guo Ren <guoren@...nel.org>
Subject: Re: [PATCH] riscv: Fix build with CONFIG_CC_OPTIMIZE_FOR_SIZE=y

On Thu, 22 Sep 2022 01:09:58 -0500, Samuel Holland wrote:
> commit 8eb060e10185 ("arch/riscv: add Zihintpause support") broke
> building with CONFIG_CC_OPTIMIZE_FOR_SIZE enabled (gcc 11.1.0):
> 
>   CC      arch/riscv/kernel/vdso/vgettimeofday.o
> In file included from <command-line>:
> ./arch/riscv/include/asm/jump_label.h: In function 'cpu_relax':
> ././include/linux/compiler_types.h:285:33: warning: 'asm' operand 0 probably does not match constraints
>   285 | #define asm_volatile_goto(x...) asm goto(x)
>       |                                 ^~~
> ./arch/riscv/include/asm/jump_label.h:41:9: note: in expansion of macro 'asm_volatile_goto'
>    41 |         asm_volatile_goto(
>       |         ^~~~~~~~~~~~~~~~~
> ././include/linux/compiler_types.h:285:33: error: impossible constraint in 'asm'
>   285 | #define asm_volatile_goto(x...) asm goto(x)
>       |                                 ^~~
> ./arch/riscv/include/asm/jump_label.h:41:9: note: in expansion of macro 'asm_volatile_goto'
>    41 |         asm_volatile_goto(
>       |         ^~~~~~~~~~~~~~~~~
> make[1]: *** [scripts/Makefile.build:249: arch/riscv/kernel/vdso/vgettimeofday.o] Error 1
> make: *** [arch/riscv/Makefile:128: vdso_prepare] Error 2
> 
> [...]

Applied, thanks!

[1/1] riscv: Fix build with CONFIG_CC_OPTIMIZE_FOR_SIZE=y
      https://git.kernel.org/palmer/c/3c349eacc559

Best regards,
-- 
Palmer Dabbelt <palmer@...osinc.com>