On Fri, Jun 27, 2014 at 03:57:45PM +0100, Jean Pihet wrote: > 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 <[email protected]> > Cc: Will Deacon <[email protected]> > ---
Acked-by: Will Deacon <[email protected]> > 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 [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
