linux-kernel - [PATCH] fs/namei.c: Update !CONFIG_DCACHE_WORD

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Date:	29 May 2016 08:41:52 -0400
From:	"George Spelvin" <linux@...encehorizons.net>
To:	geert@...ux-m68k.org, linux@...encehorizons.net
Cc:	linux-kernel@...r.kernel.org, linux@...ck-us.net,
	torvalds@...ux-foundation.org
Subject: [PATCH] fs/namei.c: Update !CONFIG_DCACHE_WORD_ACCESS case

>From be5e653c0d5ec890c32a48851dcd0a347df8e5fa Mon Sep 17 00:00:00 2001
From: George Spelvin <linux@...encehorizons.net>
Date: Sun, 29 May 2016 01:23:14 -0400
Subject: [PATCH] fs/namei.c: Update !CONFIG_DCACHE_WORD_ACCESS case

A couple of late changes to the previous patch didn't update the
!CONFIG_DCACHE_WORD_ACCESS option correspondingly.  It hadn't
changed, so didn't need re-testing, right?

Yeah.  Let that be a lesson to me.

Specifically the caller got changed in two ways:
- The function name was changed from v1 to avoid a collision.
- The self-test was updated to cover zero-length strings; the function
  needs to be updated, too.

Signed-off-by: George Spelvin <linux@...encehorizons.net>
Fixes: fcfd2fbf22d2587196890103d41e3d554c47da0e
---
Here's the combined patch, if that's preferred.  Obviously Correct(tm),
but I'm starting the full test quite right now.

That just takes a few hours.  (I have to reboot two machines multiple
times with 32- and 64-bit kernels and and test NFS between them.)

 fs/namei.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index 968dae02..dcb85255 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1952,20 +1952,20 @@ unsigned int full_name_hash(const char *name, unsigned int len)
 EXPORT_SYMBOL(full_name_hash);
 
 /* Return the "hash_len" (hash and length) of a null-terminated string */
-u64 hash_string(const char *name)
+u64 hashlen_string(const char *name)
 {
 	unsigned long hash = init_name_hash();
 	unsigned long len = 0, c;
 
 	c = (unsigned char)*name;
-	do {
+	while (c) {
 		len++;
 		hash = partial_name_hash(c, hash);
 		c = (unsigned char)name[len];
-	} while (c);
+	}
 	return hashlen_create(end_name_hash(hash), len);
 }
-EXPORT_SYMBOL(hash_string);
+EXPORT_SYMBOL(hashlen_string);
 
 /*
  * We know there's a real path component here of at least
-- 
2.8.1