From: David Laight <David.Laight@ACULAB.COM>
To: 'Ard Biesheuvel' <ardb@kernel.org>
Cc: Frederic Weisbecker <frederic@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
James Morse <james.morse@arm.com>,
Quentin Perret <qperret@google.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Mark Rutland <mark.rutland@arm.com>
Subject: RE: [PATCH 2/4] arm64: implement support for static call trampolines
Date: Mon, 25 Oct 2021 14:38:38 +0000 [thread overview]
Message-ID: <9247968df0fa4ab8a617b24195f178b4@AcuMS.aculab.com> (raw)
In-Reply-To: <CAMj1kXGuVdSVe29WoensbxC5fqp4HFQeBK2-oLxHA_BQLp2jww@mail.gmail.com>
From: Ard Biesheuvel
> Sent: 25 October 2021 15:32
...
> On arm64, we can only patch NOPs into branch instructions or vice
> versa, or we'd have to run the whole thing under stop_machine() to
> ensure that other cores don't fetch garbage.
Ok, I was thinking it would be safe to patch a single instruction.
Clearly you can't patch more than one without danger of 'garbage'.
David
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next prev parent reply other threads:[~2021-10-25 14:38 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-25 12:20 [PATCH 0/4] arm64: Support dynamic preemption v2 Frederic Weisbecker
2021-10-25 12:20 ` [PATCH 1/4] sched/preempt: Prepare for supporting !CONFIG_GENERIC_ENTRY dynamic preemption Frederic Weisbecker
2021-10-25 12:21 ` [PATCH 2/4] arm64: implement support for static call trampolines Frederic Weisbecker
2021-10-25 13:56 ` Peter Zijlstra
2021-10-25 14:08 ` Ard Biesheuvel
2021-10-25 14:19 ` Peter Zijlstra
2021-10-25 14:44 ` Peter Zijlstra
2021-10-25 14:55 ` Ard Biesheuvel
2021-10-25 15:03 ` Peter Zijlstra
2021-10-25 15:10 ` Ard Biesheuvel
2021-10-26 10:36 ` Mark Rutland
2021-10-26 10:45 ` Peter Zijlstra
2021-10-26 11:06 ` David Laight
2021-10-27 12:47 ` Mark Rutland
2021-10-25 15:03 ` David Laight
2021-10-25 14:25 ` David Laight
2021-10-25 14:31 ` Ard Biesheuvel
2021-10-25 14:38 ` David Laight [this message]
2021-10-25 12:21 ` [PATCH 3/4] arm64: Implement IRQ exit preemption static call for dynamic preemption Frederic Weisbecker
2021-10-25 12:21 ` [PATCH 4/4] arm64: Implement HAVE_PREEMPT_DYNAMIC Frederic Weisbecker
-- strict thread matches above, loose matches on Subject: below --
2021-09-20 23:32 [PATCH 0/4] arm64: Support dynamic preemption Frederic Weisbecker
2021-09-20 23:32 ` [PATCH 2/4] arm64: implement support for static call trampolines Frederic Weisbecker
2021-09-21 7:09 ` Peter Zijlstra
2021-09-21 14:44 ` Ard Biesheuvel
2021-09-21 15:08 ` Peter Zijlstra
2021-09-21 15:33 ` Mark Rutland
2021-09-21 15:55 ` Ard Biesheuvel
2021-09-21 16:28 ` Mark Rutland
2021-09-25 17:46 ` David Laight
2021-09-27 8:58 ` Mark Rutland
2021-09-21 16:10 ` Ard Biesheuvel
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