[PATCH] Avoid !__GFP_IO allocations to eat from memory reservations

[Marcelo Tosatti]

  
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Linus, 

In pre3, GFP_BUFFER allocations can eat from the "emergency" memory
reservations in case try_to_free_pages() fails for those allocations in
__alloc_pages(). 


Here goes the (tested) patch to fix that: 


--- linux/mm/page_alloc.c.orig  Thu Jun 14 11:00:14 2001
+++ linux/mm/page_alloc.c       Thu Jun 14 11:32:56 2001
@@ -453,6 +453,12 @@
                                int progress = try_to_free_pages(gfp_mask);
                                if (progress || gfp_mask & __GFP_IO)
                                        goto try_again;
+                               /*
+                                * Fail in case no progress was made and the
+                                * allocation may not be able to block on IO.
+                                */
+                               else
+                                       return NULL;
                        }
                }
        }

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