On 6/8/21 9:05 AM, Christoph Hellwig wrote:
> diff --git a/drivers/md/dm-writecache.c b/drivers/md/dm-writecache.c
> index aecc246ade26..93ca454eaca9 100644
> --- a/drivers/md/dm-writecache.c
> +++ b/drivers/md/dm-writecache.c
> @@ -1205,14 +1205,13 @@ static void memcpy_flushcache_optimized(void *dest, void *source, size_t size)
> static void bio_copy_block(struct dm_writecache *wc, struct bio *bio, void *data)
> {
> void *buf;
> - unsigned long flags;
> unsigned size;
> int rw = bio_data_dir(bio);
> unsigned remaining_size = wc->block_size;
>
> do {
> struct bio_vec bv = bio_iter_iovec(bio, bio->bi_iter);
> - buf = bvec_kmap_irq(&bv, &flags);
> + buf = bvec_kmap_local(&bv);
> size = bv.bv_len;
> if (unlikely(size > remaining_size))
> size = remaining_size;
> @@ -1230,7 +1229,7 @@ static void bio_copy_block(struct dm_writecache *wc, struct bio *bio, void *data
> memcpy_flushcache_optimized(data, buf, size);
> }
>
> - bvec_kunmap_irq(buf, &flags);
> + kunmap_local(buf);
>
> data = (char *)data + size;
> remaining_size -= size;
>From one of the functions called by kunmap_local():
unsigned long addr = (unsigned long) vaddr & PAGE_MASK;
This won't work well if bvec->bv_offset >= PAGE_SIZE I assume?
Thanks,
Bart.
