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[S390] pgtable_list corruption

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After page_table_free_rcu removed a page from the pgtable_list
page_table_free better not add it again. Otherwise a page_table_alloc
can reuse a page table fragment that is still in the rcu process.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2011-01-31 11:30:04 +01:00 committed by Martin Schwidefsky
parent f602f6d694
commit f1be77bb21
1 changed files with 2 additions and 1 deletions
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3
arch/s390/mm/pgtable.c
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@ -336,7 +336,8 @@ void page_table_free(struct mm_struct *mm, unsigned long *table)
page->flags ^= bits;
if (page->flags & FRAG_MASK) {
/* Page now has some free pgtable fragments. */
list_move(&page->lru, &mm->context.pgtable_list);
if (!list_empty(&page->lru))
list_move(&page->lru, &mm->context.pgtable_list);
page = NULL;
} else
/* All fragments of the 4K page have been freed. */