For x86_64, it is not necessary to incur the additional overhead in
kmap_atomic to map the scatter gather buffer to a linear address.
Mapping the address directly will allow in x86_64 allows multi-buffer
crypto hash alogrithms to have several unfinished buffers with their
address stored in job context before switching out of the crypto daemon.
Signed-off-by: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>
---
crypto/ahash.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/crypto/ahash.c b/crypto/ahash.c
index a92dc38..556f1fa 100644
--- a/crypto/ahash.c
+++ b/crypto/ahash.c
@@ -46,7 +46,11 @@ static int hash_walk_next(struct crypto_hash_walk *walk)
unsigned int nbytes = min(walk->entrylen,
((unsigned int)(PAGE_SIZE)) - offset);
+#ifdef CONFIG_X86_64
+ walk->data = page_address(walk->pg);
+#else
walk->data = kmap_atomic(walk->pg);
+#endif
walk->data += offset;
if (offset & alignmask) {
@@ -93,7 +97,9 @@ int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
return nbytes;
}
+#ifndef CONFIG_X86_64
kunmap_atomic(walk->data);
+#endif
crypto_yield(walk->flags);
if (err)
--
1.7.11.7
--
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