[PATCH] ubifs: work around high stack usage with clang

[Arnd Bergmann]

Building this file with clang can result in large stack usage as seen from
this warning:

fs/ubifs/auth.c:78:5: error: stack frame size of 1152 bytes in function 
'ubifs_prepare_auth_node'

The problem is that inlining ubifs_hash_calc_hmac() leads to
two SHASH_DESC_ON_STACK() blocks in the same function, and clang
for some reason does not reuse the stack space as it should.

Putting the first declaration into a separate basic block avoids
this problem and reduces the stack allocation to 640 bytes.

Signed-off-by: Arnd Bergmann <a...@arndb.de>
---
 fs/ubifs/auth.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/fs/ubifs/auth.c b/fs/ubifs/auth.c
index 5bf5fd08879e..5d3d0b37a908 100644
--- a/fs/ubifs/auth.c
+++ b/fs/ubifs/auth.c
@@ -78,7 +78,6 @@ static int ubifs_hash_calc_hmac(const struct ubifs_info *c, 
const u8 *hash,
 int ubifs_prepare_auth_node(struct ubifs_info *c, void *node,
                             struct shash_desc *inhash)
 {
-       SHASH_DESC_ON_STACK(hash_desc, c->hash_tfm);
        struct ubifs_auth_node *auth = node;
        u8 *hash;
        int err;
@@ -87,13 +86,17 @@ int ubifs_prepare_auth_node(struct ubifs_info *c, void 
*node,
        if (!hash)
                return -ENOMEM;
 
-       hash_desc->tfm = c->hash_tfm;
-       hash_desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
-       ubifs_shash_copy_state(c, inhash, hash_desc);
+       {
+               SHASH_DESC_ON_STACK(hash_desc, c->hash_tfm);
 
-       err = crypto_shash_final(hash_desc, hash);
-       if (err)
-               goto out;
+               hash_desc->tfm = c->hash_tfm;
+               hash_desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
+               ubifs_shash_copy_state(c, inhash, hash_desc);
+
+               err = crypto_shash_final(hash_desc, hash);
+               if (err)
+                       goto out;
+       }
 
        err = ubifs_hash_calc_hmac(c, hash, auth->hmac);
        if (err)
-- 
2.20.0