[PATCH] xfs: only modify ACLs if CONFIG_XFS_POSIX_ACL enabled

[Arnd Bergmann <arnd@xxxxxxxx>]

A recent bug fix added a call to forget_cached_acl(), but that
function is not always available, so we can get a build error
here:

fs/xfs/xfs_xattr.c: In function 'xfs_xattr_set':
fs/xfs/xfs_xattr.c:84:4: error: implicit declaration of function 
'forget_cached_acl' [-Werror=implicit-function-declaration]

This changes the code to use the same #ifdef that we already
use to encapsule the existing ACL handling.

Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Fixes: 6caa105651cb ("xfs: invalidate cached acl if set directly via xattr")
---
This started breaking ARM davinci_all_defconfig today in linux-next

diff --git a/fs/xfs/xfs_xattr.c b/fs/xfs/xfs_xattr.c
index 2e1eb80d5374..6229325abdd3 100644
--- a/fs/xfs/xfs_xattr.c
+++ b/fs/xfs/xfs_xattr.c
@@ -73,6 +73,7 @@ xfs_xattr_set(struct dentry *dentry, const char *name, const 
void *value,
                return xfs_attr_remove(ip, (unsigned char *)name, xflags);
        error = xfs_attr_set(ip, (unsigned char *)name,
                                (void *)value, size, xflags);
+#ifdef CONFIG_XFS_POSIX_ACL
        /*
         * Invalidate any cached ACLs if the user has bypassed the ACL
         * interface. We don't validate the content whatsoever so it is caller
@@ -85,6 +86,7 @@ xfs_xattr_set(struct dentry *dentry, const char *name, const 
void *value,
                else if (!strncmp(name, SGI_ACL_DEFAULT, strlen(name)))
                        forget_cached_acl(VFS_I(ip), ACL_TYPE_DEFAULT);
        }
+#endif
 
        return error;
 }