[PATCH] add PF_MEMALLOC to __alloc_pages()

[Rik van Riel]

Hi Linus, Alan, Mike,

the following patch sets PF_MEMALLOC for the current task
in __alloc_pages() to avoid infinite recursion when we try
to free memory from __alloc_pages().

Please apply the patch below, which fixes this (embarrasing)
bug...

regards,

Rik
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--- linux-2.4.0-prerelease/mm/page_alloc.c.orig	Wed Jan  3 12:52:13 2001
+++ linux-2.4.0-prerelease/mm/page_alloc.c	Wed Jan  3 13:01:19 2001
@@ -427,7 +427,9 @@
 		if (order > 0 && (gfp_mask & __GFP_WAIT)) {
 			zone = zonelist->zones;
 			/* First, clean some dirty pages. */
+			current->flags |= PF_MEMALLOC;
 			page_launder(gfp_mask, 1);
+			current->flags &= ~PF_MEMALLOC;
 			for (;;) {
 				zone_t *z = *(zone++);
 				if (!z)
@@ -475,7 +477,9 @@
 		 * free ourselves...
 		 */
 		} else if (gfp_mask & __GFP_WAIT) {
+			current->flags |= PF_MEMALLOC;
 			try_to_free_pages(gfp_mask);
+			current->flags &= ~PF_MEMALLOC;
 			memory_pressure++;
 			if (!order)
 				goto try_again;