Messages in this thread Patch in this message | | | Date | Mon, 10 Jul 2006 00:46:03 -0500 (CDT) | Subject | Re: [PATCH] blktrace: readahead support | From | Milton Miller <> |
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Looking at the commit
Date: Thu, 6 Jul 2006 08:03:28 +0000 (+0200) X-Git-Url: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=40359ccb836866435b03a0cb57345002b587d875
> --- a/block/blktrace.c > +++ b/block/blktrace.c .. > @@ -79,6 +79,8 @@ static u32 bio_act[3] __read_mostly = { > (((rw) & (1 << BIO_RW_BARRIER)) >> (BIO_RW_BARRIER - 0)) > #define trace_sync_bit(rw) \ > (((rw) & (1 << BIO_RW_SYNC)) >> (BIO_RW_SYNC - 1)) > +#define trace_ahead_bit(rw) \ > + (((rw) & (1 << BIO_RW_AHEAD)) << (BIO_RW_AHEAD - 0)) > > /* > * The worker for the various blk_add_trace*() types. Fills out a
Than doesn't make sense, we are using the bit position in the BIO_RW_ name space twice instead of factoring it out like the other uses.
Looking at include/linux/bio.h line 147 we find #define BIO_RW_AHEAD 1
So this is moving it from bit 1 (value 2) to bit 2 (value 4).
I think the shift should be << (2 - BIO_RW_AHEAD).
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