From: Jessica Clarke <jrtc27@jrtc27.com>
To: Andy Chiu <andy.chiu@sifive.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
Albert Ou <aou@eecs.berkeley.edu>,
rostedt@goodmis.org, Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
jpoimboe@kernel.org, jbaron@akamai.com, ardb@kernel.org,
greentime.hu@sifive.com, zong.li@sifive.com, guoren@kernel.org,
kernel@esmil.dk, linux-riscv@lists.infradead.org
Subject: Re: [PATCH RFC v2 riscv/for-next 5/5] riscv: align arch_static_branch function
Date: Wed, 14 Sep 2022 15:24:31 +0100 [thread overview]
Message-ID: <82E75CB4-3849-455E-807F-A0DBCAEED3CE@jrtc27.com> (raw)
In-Reply-To: <20220913094252.3555240-6-andy.chiu@sifive.com>
On 13 Sept 2022, at 10:42, Andy Chiu <andy.chiu@sifive.com> wrote:
>
> runtime code patching must be done at a naturally aligned address, or we
> may execute on a partial instruction.
>
> Signed-off-by: Andy Chiu <andy.chiu@sifive.com>
> Reviewed-by: Greentime Hu <greentime.hu@sifive.com>
> ---
> arch/riscv/include/asm/jump_label.h | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/arch/riscv/include/asm/jump_label.h b/arch/riscv/include/asm/jump_label.h
> index 38af2ec7b9bf..729991e8f782 100644
> --- a/arch/riscv/include/asm/jump_label.h
> +++ b/arch/riscv/include/asm/jump_label.h
> @@ -18,6 +18,7 @@ static __always_inline bool arch_static_branch(struct static_key *key,
> bool branch)
> {
> asm_volatile_goto(
> + " .align 2 \n\t"
.align is a horrible directive whose meaning changes between
architectures and requires careful thought, especially when the
argument is a power of 2. Better to use .balign 4, or .p2align 2 if you
really want to for some reason.
Jess
> " .option push \n\t"
> " .option norelax \n\t"
> " .option norvc \n\t"
> @@ -39,6 +40,7 @@ static __always_inline bool arch_static_branch_jump(struct static_key *key,
> bool branch)
> {
> asm_volatile_goto(
> + " .align 2 \n\t"
> " .option push \n\t"
> " .option norelax \n\t"
> " .option norvc \n\t"
> --
> 2.36.0
>
>
> _______________________________________________
> linux-riscv mailing list
> linux-riscv@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv
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next prev parent reply other threads:[~2022-09-14 14:24 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-13 9:42 [PATCH RFC v2 riscv/for-next 0/5] Enable ftrace with kernel preemption for RISC-V Andy Chiu
2022-09-13 9:42 ` [PATCH RFC v2 riscv/for-next 1/5] riscv: align ftrace to 4 Byte boundary and increase ftrace prologue size Andy Chiu
2022-09-15 13:53 ` Guo Ren
2022-09-17 1:15 ` Andy Chiu
2022-09-13 9:42 ` [PATCH RFC v2 riscv/for-next 2/5] riscv: export patch_insn_write Andy Chiu
2022-09-13 9:42 ` [PATCH RFC v2 riscv/for-next 3/5] riscv: ftrace: use indirect jump to work with kernel preemption Andy Chiu
2022-09-14 13:45 ` Guo Ren
2022-09-15 13:30 ` Guo Ren
2022-09-17 1:04 ` Andy Chiu
2022-09-17 10:56 ` Guo Ren
2024-02-20 14:17 ` Evgenii Shatokhin
2022-09-13 9:42 ` [PATCH RFC v2 riscv/for-next 4/5] riscv: ftrace: do not use stop_machine to update code Andy Chiu
2022-09-13 9:42 ` [PATCH RFC v2 riscv/for-next 5/5] riscv: align arch_static_branch function Andy Chiu
2022-09-14 14:06 ` Guo Ren
2022-09-16 23:54 ` Andy Chiu
2022-09-17 0:22 ` Guo Ren
2022-09-17 18:17 ` [PATCH] riscv: jump_label: Optimize size with RISCV_ISA_C guoren
2022-09-17 18:38 ` [PATCH RFC v2 riscv/for-next 5/5] riscv: align arch_static_branch function guoren
2022-09-17 23:49 ` Guo Ren
2022-09-17 23:59 ` Guo Ren
2022-09-18 0:12 ` Jessica Clarke
2022-09-18 0:46 ` Guo Ren
2022-09-14 14:24 ` Jessica Clarke [this message]
2022-09-15 1:47 ` Guo Ren
2022-09-15 2:34 ` Jessica Clarke
2024-02-13 19:42 ` [PATCH RFC v2 riscv/for-next 0/5] Enable ftrace with kernel preemption for RISC-V Evgenii Shatokhin
2024-02-21 5:27 ` Andy Chiu
2024-02-21 16:55 ` Evgenii Shatokhin
2024-03-06 20:57 ` Alexandre Ghiti
2024-03-07 8:35 ` Evgenii Shatokhin
2024-03-07 12:27 ` Andy Chiu
2024-03-07 13:21 ` Alexandre Ghiti
2024-03-07 15:57 ` Samuel Holland
2024-03-11 14:24 ` Andy Chiu
2024-03-19 14:50 ` Alexandre Ghiti
2024-03-19 14:58 ` Conor Dooley
2024-03-20 16:37 ` Andy Chiu
2024-03-18 15:31 ` Andy Chiu
2024-03-19 15:32 ` Evgenii Shatokhin
2024-03-20 16:38 ` Andy Chiu
2024-03-19 17:37 ` Alexandre Ghiti
2024-03-20 16:36 ` Andy Chiu
2024-03-21 11:02 ` Alexandre Ghiti
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