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Staging: ramzswap: remove ARM specific d-cache hack 

Remove d-cache hack in ramzswap driver that was needed
to workaround a bug in ARM version of update_mmu_cache()
which caused stale data in d-cache to be transferred to
userspace. This bug was fixed by git commit:
	787b2faadc
This also brings down one entry in TODO file.

Signed-off-by: Nitin Gupta <ngupta@vflare.org>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Nitin Gupta 2009-12-12 11:44:46 +05:30 committed by Greg Kroah-Hartman
parent 3d8affc001
commit 30fb8a7141
2 changed files with 3 additions and 26 deletions
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1
drivers/staging/ramzswap/TODO
View File

@ -1,6 +1,5 @@
TODO:
- Add support for swap notifiers
- Remove CONFIG_ARM hack
Please send patches to Greg Kroah-Hartman <greg@kroah.com> and
Nitin Gupta <ngupta@vflare.org>

28
drivers/staging/ramzswap/ramzswap_drv.c
View File

@ -222,28 +222,6 @@ static int setup_swap_header(struct ramzswap *rzs, union swap_header *s)
return ret;
}
static void ramzswap_flush_dcache_page(struct page *page)
{
#ifdef CONFIG_ARM
int flag = 0;
/*
* Ugly hack to get flush_dcache_page() work on ARM.
* page_mapping(page) == NULL after clearing this swap cache flag.
* Without clearing this flag, flush_dcache_page() will simply set
* "PG_dcache_dirty" bit and return.
*/
if (PageSwapCache(page)) {
flag = 1;
ClearPageSwapCache(page);
}
#endif
flush_dcache_page(page);
#ifdef CONFIG_ARM
if (flag)
SetPageSwapCache(page);
#endif
}
void ramzswap_ioctl_get_stats(struct ramzswap *rzs,
struct ramzswap_ioctl_stats *s)
{
@ -655,7 +633,7 @@ static int handle_zero_page(struct bio *bio)
memset(user_mem, 0, PAGE_SIZE);
kunmap_atomic(user_mem, KM_USER0);
ramzswap_flush_dcache_page(page);
flush_dcache_page(page);
set_bit(BIO_UPTODATE, &bio->bi_flags);
bio_endio(bio, 0);
@ -679,7 +657,7 @@ static int handle_uncompressed_page(struct ramzswap *rzs, struct bio *bio)
kunmap_atomic(user_mem, KM_USER0);
kunmap_atomic(cmem, KM_USER1);
ramzswap_flush_dcache_page(page);
flush_dcache_page(page);
set_bit(BIO_UPTODATE, &bio->bi_flags);
bio_endio(bio, 0);
@ -779,7 +757,7 @@ static int ramzswap_read(struct ramzswap *rzs, struct bio *bio)
goto out;
}
ramzswap_flush_dcache_page(page);
flush_dcache_page(page);
set_bit(BIO_UPTODATE, &bio->bi_flags);
bio_endio(bio, 0);