linux-kernel - Re: [PATCH] x86/irqflags: Force a register output in native_save

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Message-ID: <CANn89iLwQh+qswC=GYrOxzgztjFHhuU7NV=yu8FhLU59hLEZvA@mail.gmail.com>
Date: Thu, 18 Dec 2025 11:21:10 +0100
From: Eric Dumazet <edumazet@...gle.com>
To: "H. Peter Anvin" <hpa@...or.com>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, 
	linux-kernel <linux-kernel@...r.kernel.org>, Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH] x86/irqflags: Force a register output in native_save_fl()

On Thu, Dec 18, 2025 at 11:15 AM Eric Dumazet <edumazet@...gle.com> wrote:
>
> On Thu, Dec 18, 2025 at 11:13 AM H. Peter Anvin <hpa@...or.com> wrote:
> >

> >
> > Maybe report a bug to the clang team?
>
> This has been done 8 years ago. No progress so far...
>
> They claim we should use __builtin_ia32_readeflags_u64 /
> __builtin_ia32_writeeflags_u64, which seems unlikely to please x86
> maintainers ?

Although it seems we already use them in tools/testing/selftests/x86/helpers.h