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Message-ID: <Y35783GmAtJ+JuGW@spud>
Date: Wed, 23 Nov 2022 20:00:51 +0000
From: Conor Dooley <conor@...nel.org>
To: guoren@...nel.org
Cc: anup@...infault.org, paul.walmsley@...ive.com, palmer@...belt.com,
conor.dooley@...rochip.com, heiko@...ech.de, rostedt@...dmis.org,
mhiramat@...nel.org, jolsa@...hat.com, bp@...e.de,
jpoimboe@...nel.org, suagrfillet@...il.com, andy.chiu@...ive.com,
linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
Guo Ren <guoren@...ux.alibaba.com>
Subject: Re: [PATCH V3 3/5] riscv: ftrace: Reduce the detour code size to half
On Wed, Nov 23, 2022 at 10:39:48AM -0500, guoren@...nel.org wrote:
> From: Guo Ren <guoren@...ux.alibaba.com>
>
> Use a temporary register to reduce the size of detour code from
> 16 bytes to 8 bytes. The previous implementation is from
> afc76b8b8011 ("riscv: Using PATCHABLE_FUNCTION_ENTRY instead of
> MCOUNT").
>
> Before the patch:
> <func_prolog>:
> 0: REG_S ra, -SZREG(sp)
> 4: auipc ra, ?
> 8: jalr ?(ra)
> 12: REG_L ra, -SZREG(sp)
> (func_boddy)
>
> After the patch:
> <func_prolog>:
> 0: auipc t0, ?
> 4: jalr t0, ?(t0)
> (func_boddy)
>
> Link: https://lore.kernel.org/linux-riscv/20221122075440.1165172-1-suagrfillet@gmail.com/
> Co-developed-by: Song Shuai <suagrfillet@...il.com>
> Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
> Signed-off-by: Guo Ren <guoren@...nel.org>
FYI missing a sign-off from Song Shuai. They were happy with you folding
their patch in during the discussion linked above - so I suppose that is
an accidental omission?
Thanks,
Conor.
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