The sparc perf_callchain_user() functions looks at current->mm,
apparently to determine whether the thread is a kthread without any
valid user context.
In general, a non-NULL current->mm doesn't imply that current is a
kthread, as kthreads can install an mm via use_mm(), and so it's
preferable to use is_kthread() to determine whether a thread is a
kthread.
For consistency, let's use is_kthread() here.
Signed-off-by: Mark Rutland <mark.rutl...@arm.com>
Cc: David S. Miller <da...@davemloft.net>
Cc: Ingo Molnar <mi...@kernel.org>
Cc: Peter Zijlstra <pet...@infradead.org>
---
arch/sparc/kernel/perf_event.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/sparc/kernel/perf_event.c b/arch/sparc/kernel/perf_event.c
index a58ae9c42803..ef7b1a03bea9 100644
--- a/arch/sparc/kernel/perf_event.c
+++ b/arch/sparc/kernel/perf_event.c
@@ -1858,7 +1858,7 @@ perf_callchain_user(struct perf_callchain_entry_ctx
*entry, struct pt_regs *regs
perf_callchain_store(entry, regs->tpc);
- if (!current->mm)
+ if (is_kthread(current))
return;
flushw_user();
--
2.11.0
