[PATCH v4 07/14] mm, page_alloc: print symbolic gfp_flags on allocation failure

From: Vlastimil Babka
Date: Tue Jan 26 2016 - 07:46:36 EST

It would be useful to translate gfp_flags into string representation when
printing in case of an allocation failure, especially as the flags have been
undergoing some changes recently and the script ./scripts/gfp-translate needs
a matching source version to be accurate.

Example output:

stapio: page allocation failure: order:9, mode:0x2080020(GFP_ATOMIC)

Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Sasha Levin <sasha.levin@xxxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
mm/page_alloc.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index d60c8600e5f6..f89f51aae9a6 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2691,9 +2691,8 @@ void warn_alloc_failed(gfp_t gfp_mask, unsigned int order, const char *fmt, ...)

- pr_warn("%s: page allocation failure: order:%u, mode:0x%x\n",
- current->comm, order, gfp_mask);
+ pr_warn("%s: page allocation failure: order:%u, mode:%#x(%pGg)\n",
+ current->comm, order, gfp_mask, &gfp_mask);
if (!should_suppress_show_mem())