We currently hash the XID to determine a hash bucket to use for the
reply cache entry, which is fed into hash_32 without byte-swapping it.
Add __force to make sparse happy, and add some comments to explain
why.
Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxxxxxxx>
---
fs/nfsd/nfscache.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/fs/nfsd/nfscache.c b/fs/nfsd/nfscache.c
index 6040da8830ff..ff9567633245 100644
--- a/fs/nfsd/nfscache.c
+++ b/fs/nfsd/nfscache.c
@@ -221,7 +221,12 @@ static void
hash_refile(struct svc_cacherep *rp)
{
hlist_del_init(&rp->c_hash);
- hlist_add_head(&rp->c_hash, cache_hash + hash_32(rp->c_xid, maskbits));
+ /*
+ * No point in byte swapping c_xid since we're just using it to pick
+ * a hash bucket.
+ */
+ hlist_add_head(&rp->c_hash, cache_hash +
+ hash_32((__force u32)rp->c_xid, maskbits));
}
/*
@@ -356,7 +361,11 @@ nfsd_cache_search(struct svc_rqst *rqstp, __wsum csum)
struct hlist_head *rh;
unsigned int entries = 0;
- rh = &cache_hash[hash_32(rqstp->rq_xid, maskbits)];
+ /*
+ * No point in byte swapping rq_xid since we're just using it to pick
+ * a hash bucket.
+ */
+ rh = &cache_hash[hash_32((__force u32)rqstp->rq_xid, maskbits)];
hlist_for_each_entry(rp, rh, c_hash) {
++entries;
if (nfsd_cache_match(rqstp, csum, rp)) {
--
1.9.3
--
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