linux-kernel - Re: [PATCH -tip] x86/locking/atomic: Use asm

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Message-ID: <20250301123802.GCZ8L_qsv7-WwUwqt5@fat_crate.local>
Date: Sat, 1 Mar 2025 13:38:02 +0100
From: Borislav Petkov <bp@...en8.de>
To: Uros Bizjak <ubizjak@...il.com>
Cc: Dave Hansen <dave.hansen@...el.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH -tip] x86/locking/atomic: Use asm_inline for atomic
 locking insns

On Sat, Mar 01, 2025 at 10:05:56AM +0100, Uros Bizjak wrote:
> OTOH, -Os, where different code size/performance heuristics are used, now
> performs better w.r.t code size.

Did anything change since:

281dc5c5ec0f ("Give up on pushing CC_OPTIMIZE_FOR_SIZE")
3a55fb0d9fe8 ("Tell the world we gave up on pushing CC_OPTIMIZE_FOR_SIZE")

wrt -Os?

Because if not, we still don't love -Os and you can drop the -Os argument.

And without any perf data showing any improvement, this patch does nothing but
enlarge -O2 size...

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette