Revert "mm: fail GFP_DMA allocations when ZONE_DMA is not configured"

torvalds · torvalds · commit 1fa7b6a29c61 · 2011-06-02T06:11:24.000+09:00
This reverts commit a197b59. As rmk says: "Commit a197b59 (mm: fail GFP_DMA allocations when ZONE_DMA is not configured) is causing regressions on ARM with various drivers which use GFP_DMA. The behaviour up until now has been to silently ignore that flag when CONFIG_ZONE_DMA is not enabled, and to allocate from the normal zone. However, as a result of the above commit, such allocations now fail which causes drivers to fail. These are regressions compared to the previous kernel version." so just revert it. Requested-by: Russell King <linux@arm.linux.org.uk> Acked-by: Andrew Morton <akpm@linux-foundation.org> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
@@ -2247,10 +2247,6 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
 
 	if (should_fail_alloc_page(gfp_mask, order))
 		return NULL;
-#ifndef CONFIG_ZONE_DMA
-	if (WARN_ON_ONCE(gfp_mask & __GFP_DMA))
-		return NULL;
-#endif
 
 	/*
 	 * Check the zones suitable for the gfp_mask contain at least one
