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Message-ID: <d3453cfd4b6bcc0283865cf2dd2b03caaba8001a.1726268190.git.jpoimboe@kernel.org>
Date: Sat, 14 Sep 2024 01:02:10 +0200
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: x86@...nel.org
Cc: Peter Zijlstra <peterz@...radead.org>,
Steven Rostedt <rostedt@...dmis.org>,
Ingo Molnar <mingo@...nel.org>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
linux-kernel@...r.kernel.org,
Indu Bhagat <indu.bhagat@...cle.com>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>,
linux-perf-users@...r.kernel.org,
Mark Brown <broonie@...nel.org>,
linux-toolchains@...r.kernel.org,
Jordan Rome <jordalgo@...a.com>,
Sam James <sam@...too.org>
Subject: [PATCH v2 08/11] perf: Simplify get_perf_callchain() user logic
Simplify the get_perf_callchain() user logic a bit. task_pt_regs()
should never be NULL.
Acked-by: Namhyung Kim <namhyung@...nel.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
---
kernel/events/callchain.c | 20 +++++++++-----------
1 file changed, 9 insertions(+), 11 deletions(-)
diff --git a/kernel/events/callchain.c b/kernel/events/callchain.c
index 655fb25a725b..2278402b7ac9 100644
--- a/kernel/events/callchain.c
+++ b/kernel/events/callchain.c
@@ -241,22 +241,20 @@ get_perf_callchain(struct pt_regs *regs, bool kernel, bool user,
if (user) {
if (!user_mode(regs)) {
- if (current->mm)
- regs = task_pt_regs(current);
- else
- regs = NULL;
+ if (!current->mm)
+ goto exit_put;
+ regs = task_pt_regs(current);
}
- if (regs) {
- if (add_mark)
- perf_callchain_store_context(&ctx, PERF_CONTEXT_USER);
+ if (add_mark)
+ perf_callchain_store_context(&ctx, PERF_CONTEXT_USER);
- start_entry_idx = entry->nr;
- perf_callchain_user(&ctx, regs);
- fixup_uretprobe_trampoline_entries(entry, start_entry_idx);
- }
+ start_entry_idx = entry->nr;
+ perf_callchain_user(&ctx, regs);
+ fixup_uretprobe_trampoline_entries(entry, start_entry_idx);
}
+exit_put:
put_callchain_entry(rctx);
return entry;
--
2.46.0
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