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[PATCH] add PF_MEMALLOC to __alloc_pages()
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;
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