linux-kernel - Re: [PATCH v5 4/4] entry: Inline syscall_exit_to_user

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Message-ID: <87jz8y3953.ffs@tglx>
Date: Sun, 09 Mar 2025 09:23:20 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: Charlie Jenkins <charlie@...osinc.com>
Cc: Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt
 <palmer@...belt.com>, Huacai Chen <chenhuacai@...nel.org>, WANG Xuerui
 <kernel@...0n.name>, Peter Zijlstra <peterz@...radead.org>, Andy
 Lutomirski <luto@...nel.org>, Alexandre Ghiti <alexghiti@...osinc.com>,
 linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
 loongarch@...ts.linux.dev
Subject: Re: [PATCH v5 4/4] entry: Inline syscall_exit_to_user_mode()

On Sat, Mar 08 2025 at 16:08, Charlie Jenkins wrote:
> On Sat, Mar 08, 2025 at 01:37:30PM +0100, Thomas Gleixner wrote:
>> On Wed, Mar 05 2025 at 16:43, Charlie Jenkins wrote:
>> > Architectures using the generic entry code can be optimized by having
>> > syscall_exit_to_user_mode inlined.
>> 
>> That's a pretty handwavy claim. What's the actual benefit in numbers?
>
> I put the numbers in the cover letter! Here is the data I gathered:

They should be in the change log as the cover letter is not part of what
ends up in git.