linux-kernel - Re: [PATCH v3 1/3] kasan: mark !__SANITIZE_ADDRESS__ stubs __always

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Message-ID: <20260104060739.GAaVoDq_VggsNP5jif@fat_crate.local>
Date: Sun, 4 Jan 2026 07:07:39 +0100
From: Borislav Petkov <bp@...en8.de>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Brendan Jackman <jackmanb@...gle.com>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	Alexander Potapenko <glider@...gle.com>,
	Andrey Konovalov <andreyknvl@...il.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Vincenzo Frascino <vincenzo.frascino@....com>,
	Marco Elver <elver@...gle.com>, Ard Biesheuvel <ardb@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>, kasan-dev@...glegroups.com,
	linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH v3 1/3] kasan: mark !__SANITIZE_ADDRESS__ stubs
 __always_inline

On Thu, Dec 18, 2025 at 10:24:39AM +0100, Peter Zijlstra wrote:
> > And in the meantime, I guess patch 3/3 is OK? 
> 
> I'm not sure, ISTR having yelled profanities at GCOV in general for
> being just straight up broken. And people seem to insist on adding more
> and more *COV variants and I keep yelling at them or something.
> 
> That is GCOV, KCOV and llvm-cov are all doing basically the same damn
> thing (and sure, llvm-cov gets more edges but details) and we should not
> be having 3 different damn interfaces for it. Also, they all should
> bloody well respect noinstr and if they don't they're just broken and
> all that :-)
> 
> That is, I'd as soon just make them all "depend BROKEN" and call it a
> day.

Right.

And I don't think anyone has had any serious plans for COV-ing the SEV code so
lemme take 3/3.

I, like Peter, am gravitating towards a kill-that-thing-with-a-master-switch
instead of whack-a-mole-ing the kernel.

Thx.

-- 
Regards/Gruss,
    Boris.

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