From: Oleg Nesterov <oleg@redhat.com>
To: Rosen Penev <rosenp@gmail.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Namhyung Kim <namhyung@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@kernel.org>, Ian Rogers <irogers@google.com>,
Adrian Hunter <adrian.hunter@intel.com>,
James Clark <james.clark@linaro.org>,
linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org,
linux-perf-users@vger.kernel.org
Subject: Re: [PATCH v2] uprobes: Use flexible array for xol_area bitmap
Date: Wed, 11 Nov 2026 16:06:50 +0100 [thread overview]
Message-ID: <avSEikCPEn_Q3KpI@redhat.com> (raw)
In-Reply-To: <20261111022605.66010-1-rosenp@gmail.com>
On 11/10, Rosen Penev wrote:
>
> --- a/kernel/events/uprobes.c
> +++ b/kernel/events/uprobes.c
> @@ -108,7 +108,6 @@ static LIST_HEAD(delayed_uprobe_list);
> */
> struct xol_area {
> wait_queue_head_t wq; /* if all slots are busy */
> - unsigned long *bitmap; /* 0 = free slot */
>
> struct page *page;
> /*
> @@ -117,6 +116,7 @@ struct xol_area {
> * the vma go away, and we must handle that reasonably gracefully.
> */
> unsigned long vaddr; /* Page(s) of instruction slots */
> + unsigned long bitmap[]; /* 0 = free slot */
I agree with Peter, you can just use
unsigned long bitmap[BITS_TO_LONGS(UINSNS_PER_PAGE)];
Oleg.
prev parent reply other threads:[~2026-11-11 15:07 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-11 2:26 [PATCH v2] uprobes: Use flexible array for xol_area bitmap Rosen Penev
2026-11-11 2:48 ` sashiko-bot
2026-11-11 9:09 ` Peter Zijlstra
2026-11-11 15:06 ` Oleg Nesterov [this message]
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