From: "Alexei Starovoitov" <alexei.starovoitov@gmail.com>
To: "Puranjay Mohan" <puranjay@kernel.org>, <bpf@vger.kernel.org>
Cc: <daniel@iogearbox.net>, <andrii@kernel.org>, <eddyz87@gmail.com>,
<memxor@gmail.com>, "Puranjay Mohan" <puranjay12@gmail.com>
Subject: Re: [PATCH bpf] bpf: Don't hold pack_mutex over arm64 IPIs
Date: Wed, 28 Oct 2026 04:23:36 +0000 [thread overview]
Message-ID: <DMG6O6EP77A5.2C5VRL2JY4KAJ@gmail.com> (raw)
In-Reply-To: <m21p9avrr7.fsf@kernel.org>
On Tue, Oct 27, 2026 at 12:59 PM Puranjay Mohan <puranjay@kernel.org> wrote:
> Can't we do the bpf_arch_text_invalidate() before taking the pack_mutex?
> then it works on all architectures and there is no lock nesting.
>
> Because the caller owns [ptr, ptr+size) until bitmap_clear() so it
> should work.
Interesting idea. I guess that's simpler.
bpf_arch_text_copy() already writes into a pack without pack_mutex.
but other archs gain nothing. fine.
> I can commandeer it if you want.
Sure. pls go ahead.
pw-bot:cr
first time for my own patches. next level unlocked :)
prev parent reply other threads:[~2026-10-28 4:23 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-24 3:10 [PATCH bpf] bpf: Don't hold pack_mutex over arm64 IPIs Alexei Starovoitov
2026-10-27 19:59 ` Puranjay Mohan
2026-10-28 4:23 ` Alexei Starovoitov [this message]
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