linux-kernel - Re: [PATCH] riscv: Improve sbi_ecall() code generation by reordering arguments

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Message-ID: <CAHVXubisa6HQJDbj_GfjwhP1Y4as0DzrxsU0B7N6DSU6HZNaaw@mail.gmail.com>
Date: Sun, 24 Mar 2024 19:19:56 +0100
From: Alexandre Ghiti <alexghiti@...osinc.com>
To: Qingfang Deng <dqfext@...il.com>
Cc: aou@...s.berkeley.edu, linux-kernel@...r.kernel.org, 
	linux-riscv@...ts.infradead.org, palmer@...belt.com, paul.walmsley@...ive.com, 
	samuel.holland@...ive.com
Subject: Re: [PATCH] riscv: Improve sbi_ecall() code generation by reordering arguments

Hi Qingfang,

On Sat, Mar 23, 2024 at 7:26 AM Qingfang Deng <dqfext@...il.com> wrote:
>
> Hi Alexandre,
>
> You can simply make sbi_ecall `__always_inline`, so the C function call
> overhead can be fully avoided.

I understand your point, though I don't think we need to mark
sbi_ecall() as inline, it's not in any hot path so it's not worth it.
This patch simply gets rid of a really useless overhead, but it does
not visibly accelerate anything.

I hope it makes sense,

Thanks,

Alex