linux-kernel - Re: [PATCH] x86/hweight: Fix and improve __arch

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Message-ID: <20250310201227.GXZ89Hq5LVWKHjHBeO@fat_crate.local>
Date: Mon, 10 Mar 2025 21:12:27 +0100
From: Borislav Petkov <bp@...en8.de>
To: Uros Bizjak <ubizjak@...il.com>
Cc: x86@...nel.org, linux-kernel@...r.kernel.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] x86/hweight: Fix and improve __arch_hweight{32,64}()
 assembly

On Mon, Mar 10, 2025 at 09:08:04PM +0100, Uros Bizjak wrote:
> a) Use ASM_CALL_CONSTRAINT to prevent inline asm that includes call
> instruction from being scheduled before the frame pointer gets set
> up by the containing function, causing objtool to print a "call
> without frame pointer save/setup" warning.

The other two are ok but this is new. How do you trigger this? I've never seen
it in my randconfig builds...

-- 
Regards/Gruss,
    Boris.

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