From: Will Deacon <will@kernel.org>
To: "André Almeida" <andrealmeid@igalia.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Billy Laws <blaws05@gmail.com>,
Mark Rutland <mark.rutland@arm.com>,
Mark Brown <broonie@kernel.org>,
Ryan Houdek <sonicadvance1@gmail.com>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, kernel-dev@igalia.com
Subject: Re: [RFC PATCH v3 1/1] arch: arm64: Implement unaligned atomic emulation
Date: Wed, 30 Sep 2026 08:48:42 +0100 [thread overview]
Message-ID: <ary-2rOs_b2IY6M1@willie-the-truck> (raw)
In-Reply-To: <20260930020138.2377090-2-andrealmeid@igalia.com>
On Tue, Sep 29, 2026 at 11:01:38PM -0300, André Almeida wrote:
> Implement support for emulating unaligned atomic operations on arm64.
> User applications that wish to enable support for this should use the
> pctrl() flag `PR_ARM64_UNALIGN_ATOMIC_EMULATE`.
>
> Signed-off-by: André Almeida <andrealmeid@igalia.com>
> ---
> arch/arm64/Kconfig | 6 +
> arch/arm64/include/asm/exception.h | 1 +
> arch/arm64/include/asm/processor.h | 5 +
> arch/arm64/include/asm/rwonce.h | 14 +-
> arch/arm64/include/asm/thread_info.h | 1 +
> arch/arm64/kernel/Makefile | 3 +-
> arch/arm64/kernel/process.c | 15 +
> arch/arm64/kernel/unaligned_atomic.c | 521 +++++++++++++++++++++++++++
> arch/arm64/mm/fault.c | 10 +
> include/uapi/linux/prctl.h | 5 +
> kernel/sys.c | 7 +-
> 11 files changed, 579 insertions(+), 9 deletions(-)
> create mode 100644 arch/arm64/kernel/unaligned_atomic.c
No.
I already explained to you why this doesn't work:
https://lore.kernel.org/r/aV1YnOetDHhKe4hz@willie-the-truck
Will
next prev parent reply other threads:[~2026-09-30 7:48 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-30 2:01 [RFC PATCH v3 0/1] arch: arm64: Implement unaligned atomic emulation André Almeida
2026-09-30 2:01 ` [RFC PATCH v3 1/1] " André Almeida
2026-09-30 7:48 ` Will Deacon [this message]
2026-09-30 10:29 ` André Almeida
2026-09-30 13:29 ` Will Deacon
2026-10-01 17:54 ` André Almeida
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