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authorJean Delvare <khali@linux-fr.org>2009-06-23 04:12:24 -0700
committerDavid S. Miller <davem@davemloft.net>2009-08-07 10:42:55 -0700
commita907905219dc83f501274d5d8c6d2aa2161ff8c3 (patch)
tree05e0e87ca7440b8985b526ea3c81eaa94ace0030
parent90bc1a658a53f8832ee799685703977a450e5af9 (diff)
IDE: Save a call to PageHighMem()
PageHighMem() isn't cheap so avoid calling it twice on the same page. Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/ide/ide-taskfile.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c
index 75b85a8cd2d..90e5c0deb0e 100644
--- a/drivers/ide/ide-taskfile.c
+++ b/drivers/ide/ide-taskfile.c
@@ -236,6 +236,7 @@ void ide_pio_bytes(ide_drive_t *drive, struct ide_cmd *cmd,
while (len) {
unsigned nr_bytes = min(len, cursg->length - cmd->cursg_ofs);
+ int page_is_high;
if (nr_bytes > PAGE_SIZE)
nr_bytes = PAGE_SIZE;
@@ -247,7 +248,8 @@ void ide_pio_bytes(ide_drive_t *drive, struct ide_cmd *cmd,
page = nth_page(page, (offset >> PAGE_SHIFT));
offset %= PAGE_SIZE;
- if (PageHighMem(page))
+ page_is_high = PageHighMem(page);
+ if (page_is_high)
local_irq_save(flags);
buf = kmap_atomic(page, KM_BIO_SRC_IRQ) + offset;
@@ -268,7 +270,7 @@ void ide_pio_bytes(ide_drive_t *drive, struct ide_cmd *cmd,
kunmap_atomic(buf, KM_BIO_SRC_IRQ);
- if (PageHighMem(page))
+ if (page_is_high)
local_irq_restore(flags);
len -= nr_bytes;