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venti: work around gcc 4.3 bug (reported by Lucho Ionkov)

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Russ Cox 2008-07-31 15:41:54 -04:00
parent 17b19538a4
commit dce4cbabd1
1 changed files with 13 additions and 1 deletions
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14
src/cmd/venti/srv/icache.c
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@ -15,7 +15,19 @@ struct ICache
IHash *hash; IHash *hash;
IEntry *entries; IEntry *entries;
int nentries; int nentries;
IEntry free;
/*
* gcc 4.3 inlines the pushfirst loop in initicache,
* but the inliner incorrectly deduces that
* icache.free.next has a constant value
* throughout the loop. (In fact, pushfirst
* assigns to it as ie->prev->next.)
* Marking it volatile should avoid this bug.
* The speed of linked list operations is dwarfed
* by the disk i/o anyway.
*/
volatile IEntry free;
IEntry clean; IEntry clean;
IEntry dirty; IEntry dirty;
u32int maxdirty; u32int maxdirty;