mm/page_alloc: use might_alloc()

...  instead of open coding it.  Completely equivalent code, just a notch
more meaningful when reading.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Daniel Vetter <[email protected]>
Reviewed-by: David Hildenbrand <[email protected]>
Reviewed-by: Vlastimil Babka <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Cc: Pekka Enberg <[email protected]>
Cc: Roman Gushchin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

mm/page_alloc.c

@@ -5197,10 +5197,7 @@ static inline bool prepare_alloc_pages(gfp_t gfp_mask, unsigned int order,
 			*alloc_flags |= ALLOC_CPUSET;
 	}
 
-	fs_reclaim_acquire(gfp_mask);
-	fs_reclaim_release(gfp_mask);
-
-	might_sleep_if(gfp_mask & __GFP_DIRECT_RECLAIM);
+	might_alloc(gfp_mask);
 
 	if (should_fail_alloc_page(gfp_mask, order))
 		return false;