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From: Qiliang Yuan <odys.yuan@gmail.com>
To: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Russell King <linux@armlinux.org.uk>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Madhavan Srinivasan <maddy@linux.ibm.com>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Nicholas Piggin <npiggin@gmail.com>,
	"Christophe Leroy (CS GROUP)" <chleroy@kernel.org>,
	"Ritesh Harjani (IBM)" <ritesh.list@gmail.com>,
	Shrikanth Hegde <sshegde@linux.ibm.com>,
	Paul Walmsley <pjw@kernel.org>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Alexandre Ghiti <alex@ghiti.fr>,
	Heiko Carstens <hca@linux.ibm.com>,
	Vasily Gorbik <gor@linux.ibm.com>,
	Alexander Gordeev <agordeev@linux.ibm.com>,
	Christian Borntraeger <borntraeger@linux.ibm.com>,
	Sven Schnelle <svens@linux.ibm.com>,
	Thomas Gleixner <tglx@kernel.org>, Ingo Molnar <mingo@redhat.com>,
	Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
	Shuah Khan <shuah@kernel.org>, Marco Elver <elver@google.com>,
	Alexander Potapenko <glider@google.com>,
	Andrey Konovalov <andreyknvl@gmail.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	Vincenzo Frascino <vincenzo.frascino@arm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-arm-kernel@lists.infradead.org, Kees Cook <kees@kernel.org>,
	linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org,
	linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org,
	linux-s390@vger.kernel.org, linux-kselftest@vger.kernel.org,
	kasan-dev@googlegroups.com, linux-mm@kvack.org,
	Peter Collingbourne <peter@pcc.me.uk>
Subject: Re: [PATCH 1/2] word-at-a-time: check the first byte in load_unaligned_zeropad()
Date: Thu, 22 Oct 2026 10:18:20 +0800	[thread overview]
Message-ID: <20261022021820.1789083-1-odys.yuan@gmail.com> (raw)
In-Reply-To: <CAPAsAGyrH1quaLuyui6Qm5sokid8=yjNbAM3cOunynfPNQtfgg@mail.gmail.com>

On Tue, 20 Oct 2026 12:58:54 -0400, Andrey Ryabinin wrote:
>> +	/* open-coded instrument_read(addr, 1), as in read_word_at_a_time() */
>
> Why it's open-coded ?

For the same reason as read_word_at_a_time(): commit ece69af2ede1
("rwonce: handle KCSAN like KASAN in read_word_at_a_time()") open-coded
it "to avoid having to pull the entire instrumented.h header into
rwonce.h". I kept the six asm/word-at-a-time.h headers to the same two
small headers, kasan-checks.h and kcsan-checks.h, rather than pulling in
instrumented.h with linux/bug.h and kmsan-checks.h.

Thanks,
Qiliang

  reply	other threads:[~2026-10-22  2:18 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-10-19  1:58 [PATCH 0/2] word-at-a-time: let KASAN see load_unaligned_zeropad() Qiliang Yuan
2026-10-19  1:58 ` [PATCH 1/2] word-at-a-time: check the first byte in load_unaligned_zeropad() Qiliang Yuan
2026-10-19 22:30   ` Marco Elver
2026-10-20 16:58   ` Andrey Ryabinin
2026-10-22  2:18     ` Qiliang Yuan [this message]
2026-10-19  1:58 ` [PATCH 2/2] kasan/test: cover load_unaligned_zeropad() Qiliang Yuan
2026-10-20 17:05   ` Andrey Ryabinin

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