tracing: Don't call page_to_pfn() if page is NULL

When allocating memory fails, page is NULL. page_to_pfn() will
cause the kernel panicked if we don't use sparsemem vmemmap.

Link: http://lkml.kernel.org/r/[email protected]

Cc: Frederic Weisbecker <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: stable <[email protected]>
Acked-by: Mel Gorman <[email protected]>
Reviewed-by: Minchan Kim <[email protected]>
Signed-off-by: Wen Congyang <[email protected]>
Signed-off-by: Steven Rostedt <[email protected]>

0 files changed, 0 insertions, 0 deletions