We try to support different page offset for xor compution functions
in the following. To avoid repeatly allocate a new array each time,
we add a memory region into scribble buffer to record offset.
Signed-off-by: Yufen Yu <yuyufen@xxxxxxxxxx>
---
drivers/md/raid5.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index fb8d1fb14088..a4df2c2085a6 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -1404,6 +1404,15 @@ static addr_conv_t *to_addr_conv(struct stripe_head *sh,
return (void *) (to_addr_page(percpu, i) + sh->disks + 2);
}
+/*
+ * Return a pointer to record offset address.
+ */
+static unsigned int *
+to_addr_offs(struct stripe_head *sh, struct raid5_percpu *percpu)
+{
+ return (unsigned int *) (to_addr_conv(sh, percpu, 0) + sh->disks + 2);
+}
+
static struct dma_async_tx_descriptor *
ops_run_compute5(struct stripe_head *sh, struct raid5_percpu *percpu)
{
@@ -2253,8 +2262,9 @@ static int scribble_alloc(struct raid5_percpu *percpu,
int num, int cnt)
{
size_t obj_size =
- sizeof(struct page *) * (num+2) +
- sizeof(addr_conv_t) * (num+2);
+ sizeof(struct page *) * (num + 2) +
+ sizeof(addr_conv_t) * (num + 2) +
+ sizeof(unsigned int) * (num + 2);
void *scribble;
/*
--
2.25.4
