From: Andy Lutomirski <luto@kernel.org>
Date: Tue, 22 Mar 2016 21:25:04 +0000 (-0700)
Subject: ext4: in ext4_dir_llseek, check syscall bitness directly
X-Git-Tag: v4.6-rc1~45^2~66
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=121cef8f17d80e97838ea2f88715417e675e4403;p=linux.git

ext4: in ext4_dir_llseek, check syscall bitness directly

ext4 treats directory offsets differently for 32-bit and 64-bit callers.
Check the caller type using in_compat_syscall, not is_compat_task.  This
changes behavior on SPARC slightly.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
index 33f5e2a50cf8..50ba27cbed03 100644
--- a/fs/ext4/dir.c
+++ b/fs/ext4/dir.c
@@ -285,7 +285,7 @@ static int ext4_readdir(struct file *file, struct dir_context *ctx)
 static inline int is_32bit_api(void)
 {
 #ifdef CONFIG_COMPAT
-	return is_compat_task();
+	return in_compat_syscall();
 #else
 	return (BITS_PER_LONG == 32);
 #endif