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Date: Mon, 7 Jul 2014 15:45:08 +0200 From: Jean Pihet <jean.pihet@...aro.org> To: linux-kernel@...r.kernel.org, linaro-kernel@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org, Will Deacon <will.deacon@....com> Cc: Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>, Arnaldo Carvalho de Melo <acme@...radead.org>, steve.capper@...aro.org, Jean Pihet <jean.pihet@...aro.org> Subject: [PATCH 1/3] ARM: perf: Check that current->mm is alive before getting user callchain An event may occur when an mm is already released. As per commit 20afc60f892d285fde179ead4b24e6a7938c2f1b 'x86, perf: Check that current->mm is alive before getting user callchain' Signed-off-by: Jean Pihet <jean.pihet@...aro.org> Cc: Will Deacon <will.deacon@....com> Acked-by: Will Deacon <will.deacon@....com> --- arch/arm/kernel/perf_event.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c index 4238bcb..6493c4c 100644 --- a/arch/arm/kernel/perf_event.c +++ b/arch/arm/kernel/perf_event.c @@ -590,6 +590,10 @@ perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs) } perf_callchain_store(entry, regs->ARM_pc); + + if (!current->mm) + return; + tail = (struct frame_tail __user *)regs->ARM_fp - 1; while ((entry->nr < PERF_MAX_STACK_DEPTH) && -- 1.8.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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