A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-29 03:01:39 -04:00
Code Issues Projects Releases Packages Wiki Activity

block: add helpers to run flush_dcache_page() against a bio and a request's pages

Browse source 
Mtdblock driver doesn't call flush_dcache_page for pages in request.  So,
this causes problems on architectures where the icache doesn't fill from
the dcache or with dcache aliases.  The patch fixes this.

The ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE symbol was introduced to avoid
pointless empty cache-thrashing loops on architectures for which
flush_dcache_page() is a no-op.  Every architecture was provided with this
flush pages on architectires where ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE is
equal 1 or do nothing otherwise.

See "fix mtd_blkdevs problem with caches on some architectures" discussion
on LKML for more information.

Signed-off-by: Ilya Loginov <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: David Woodhouse <[email protected]>
Cc: Peter Horton <[email protected]>
Cc: "Ed L. Cashin" <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Ilya Loginov 2009-11-26 09:16:19 +01:00 • committed by Jens Axboe
commit 2d4dc890b5
29 changed files with 83 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

12
fs/bio.c
View file

@ -1393,6 +1393,18 @@ void bio_check_pages_dirty(struct bio *bio)
}
}
#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
void bio_flush_dcache_pages(struct bio *bi)
{
int i;
struct bio_vec *bvec;
bio_for_each_segment(bvec, bi, i)
flush_dcache_page(bvec->bv_page);
}
EXPORT_SYMBOL(bio_flush_dcache_pages);
#endif
/**
* bio_endio - end I/O on a bio
* @bio: bio