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Date: Tue, 16 Dec 2025 14:01:55 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: Brendan Jackman <jackmanb@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>,
	Alexander Potapenko <glider@google.com>,
	Andrey Konovalov <andreyknvl@gmail.com>,
	Dmitry Vyukov <dvyukov@google.com>,
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	Justin Stitt <justinstitt@google.com>, kasan-dev@googlegroups.com,
	linux-kernel@vger.kernel.org, llvm@lists.linux.dev
Subject: Re: [PATCH v3 1/3] kasan: mark !__SANITIZE_ADDRESS__ stubs
 __always_inline
Message-ID: <20251216130155.GD3707891@noisy.programming.kicks-ass.net>
References: <20251216-gcov-inline-noinstr-v3-0-10244d154451@google.com>
 <20251216-gcov-inline-noinstr-v3-1-10244d154451@google.com>
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In-Reply-To: <20251216-gcov-inline-noinstr-v3-1-10244d154451@google.com>

On Tue, Dec 16, 2025 at 10:16:34AM +0000, Brendan Jackman wrote:
> The x86 instrumented bitops in
> include/asm-generic/bitops/instrumented-non-atomic.h are
> KASAN-instrumented via explicit calls to instrument_* functions from
> include/linux/instrumented.h.
> 
> This bitops are used from noinstr code in __sev_es_nmi_complete(). This
> code avoids noinstr violations by disabling __SANITIZE_ADDRESS__ etc for
> the compilation unit.

Yeah, so don't do that? That's why we use raw_atomic_*() in things like
smp_text_poke_int3_handler().