[PATCH] cma: Take __GFP_NOWARN into account in cma_alloc()

[Boris Brezillon]

cma_alloc() unconditionally prints an INFO message when the CMA
allocation fails. Make this message conditional on the non-presence of
__GFP_NOWARN in gfp_mask.

Signed-off-by: Boris Brezillon <boris.brezillon at free-electrons.com>
---
Hello,

This patch aims at removing INFO messages that are displayed when the
VC4 driver tries to allocate buffer objects. From the driver perspective
an allocation failure is acceptable, and the driver can possibly do
something to make following allocation succeed (like flushing the VC4
internal cache).

Also, I don't understand why this message is only an INFO message, and
not a WARN (pr_warn()). Please let me know if you have good reasons to
keep it as an unconditional pr_info().

Thanks,

Boris
---
 mm/cma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/cma.c b/mm/cma.c
index c0da318c020e..022e52bd8370 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -460,7 +460,7 @@ struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
 
 	trace_cma_alloc(pfn, page, count, align);
 
-	if (ret) {
+	if (ret && !(gfp_mask & __GFP_NOWARN)) {
 		pr_info("%s: alloc failed, req-size: %zu pages, ret: %d\n",
 			__func__, count, ret);
 		cma_debug_show_areas(cma);
-- 
2.11.0