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:
	787b2faadc4356b6c2c71feb42fb944fece9a12f
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>

2 files changed, 3 insertions, 26 deletions

diff --git a/drivers/staging/ramzswap/TODO b/drivers/staging/ramzswap/TODO
index bac40d6cb9f1..8d64e28fac0e 100644
--- a/drivers/staging/ramzswap/TODO
+++ b/drivers/staging/ramzswap/TODO
@@ -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>
diff --git a/drivers/staging/ramzswap/ramzswap_drv.c b/drivers/staging/ramzswap/ramzswap_drv.c
index b839f05efbce..989fac5b01b3 100644
--- a/drivers/staging/ramzswap/ramzswap_drv.c
+++ b/drivers/staging/ramzswap/ramzswap_drv.c
@@ -222,28 +222,6 @@ out:
         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);