path: root/init
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authorJiri Hladky <>2008-06-02 12:00:19 +0200
committerIngo Molnar <>2008-06-17 10:55:47 +0200
commite01b70ef3eb3080fecc35e15f68cd274c0a48163 (patch)
tree968f1da3d1f60236df49c24943e99bbf84ce81ca /init
parent066519068ad2fbe98c7f45552b1f592903a9c8c8 (diff)
x86: fix bug in arch/i386/lib/delay.c file, delay_loop function
when trying to understand how Bogomips are implemented I have found a bug in arch/i386/lib/delay.c file, delay_loop function. The function fails for loops > 2^31+1. It because SF is set when dec returns numbers > 2^31. The fix is to use jnz instruction instead of jns (and add one decl instruction to the end to have exactly the same number of loops as in original version). Martin Mares observed: > It is a long time since I have hacked that file, but you should definitely > make sure that the function is never called with a zero argument. In such > case, the original version made just a single pass, but your version > makes 2^32 of them. fixed that. Signed-off-by: Ingo Molnar <>
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