Hi,
the following patch corrects a bug where rmap would continue
trying to swap out a page even after it failed on one pte,
which could result in leaked pte chains and a bug when exiting
applications which use mlock().
The bug was tracked down by Christian Ehrhardt, the reason
it wasn't found earlier was a subtlety in the code, so I've
taken the liberty of changing Christian's patch into something
more explicit, we shouldn't let this one happen again ;)
please apply,
Rik
-- Bravely reimplemented by the knights who say "NIH".http://www.surriel.com/ http://distro.conectiva.com/
===== mm/rmap.c 1.7 vs edited ===== --- 1.7/mm/rmap.c Wed Jul 31 06:58:53 2002 +++ edited/mm/rmap.c Mon Aug 12 11:22:05 2002 @@ -328,7 +328,7 @@ case SWAP_SUCCESS: /* Free the pte_chain struct. */ pte_chain_free(pc, prev_pc, page); - break; + continue; case SWAP_AGAIN: /* Skip this pte, remembering status. */ prev_pc = pc; @@ -336,12 +336,13 @@ continue; case SWAP_FAIL: ret = SWAP_FAIL; - break; + goto give_up; case SWAP_ERROR: ret = SWAP_ERROR; - break; + goto give_up; } } +give_up: /* Check whether we can convert to direct pte pointer */ pc = page->pte.chain; if (pc && !pc->next) {
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This archive was generated by hypermail 2b29 : Thu Aug 15 2002 - 22:00:28 EST