From: Oleg Nesterov <oleg@redhat.com>
To: Liao Chang <liaochang1@huawei.com>
Cc: peterz@infradead.org, mingo@redhat.com, acme@kernel.org,
namhyung@kernel.org, mark.rutland@arm.com,
alexander.shishkin@linux.intel.com, jolsa@kernel.org,
irogers@google.com, adrian.hunter@intel.com,
kan.liang@linux.intel.com, mhiramat@kernel.org,
linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-trace-kernel@vger.kernel.org
Subject: Re: [PATCH] uprobes: Remove redundant spinlock in uprobe_deny_signal
Date: Wed, 31 Jul 2024 16:12:32 +0200 [thread overview]
Message-ID: <20240731141231.GB16718@redhat.com> (raw)
In-Reply-To: <20240731095017.1560516-1-liaochang1@huawei.com>
On 07/31, Liao Chang wrote:
>
> --- a/kernel/events/uprobes.c
> +++ b/kernel/events/uprobes.c
> @@ -1979,9 +1979,7 @@ bool uprobe_deny_signal(void)
> WARN_ON_ONCE(utask->state != UTASK_SSTEP);
>
> if (task_sigpending(t)) {
> - spin_lock_irq(&t->sighand->siglock);
> clear_tsk_thread_flag(t, TIF_SIGPENDING);
> - spin_unlock_irq(&t->sighand->siglock);
Agreed, in this case ->siglock buys nothing, another signal can come
right after spin_unlock().
Acked-by: Oleg Nesterov <oleg@redhat.com>
next prev parent reply other threads:[~2024-07-31 14:12 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-07-31 9:50 [PATCH] uprobes: Remove redundant spinlock in uprobe_deny_signal Liao Chang
2024-07-31 14:12 ` Oleg Nesterov [this message]
2024-10-22 2:22 ` Masami Hiramatsu
2024-10-22 3:45 ` Masami Hiramatsu
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