linux-kernel - [PATCH RESEND] fs/exofs: Remove ignored _

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Date:   Fri, 25 Jan 2019 23:42:02 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Boaz Harrosh <ooo@...ctrozaur.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org
Cc:     Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: [PATCH RESEND] fs/exofs: Remove ignored __weak attribute

Clang warns that the __weak attribute is going to be ignored on
g_attr_inode_data because it's not in the correct location (needs to be
after the type).

In file included from fs/exofs/dir.c:35:
In file included from fs/exofs/exofs.h:41:
fs/exofs/common.h:186:21: warning: 'weak' attribute only applies to
variables, functions, and classes [-Wignored-attributes]
static const struct __weak osd_attr g_attr_inode_data = ATTR_DEF(
                    ^

Turns out that GCC ignores the attribute too albeit silently because
moving the attribute after either osd_attr or g_attr_inode_data like
all other uses of __weak on variables in the kernel causes a build
error on both GCC and Clang because static variables cannot be weak
since weak definitions rely on not having internal linkage:

In file included from fs/exofs/namei.c:34:
In file included from fs/exofs/exofs.h:41:
fs/exofs/common.h:186:30: error: weak declaration cannot have internal
linkage
static const struct osd_attr __weak g_attr_inode_data = ATTR_DEF(
                             ^

Just remove the attribute because it hasn't been correct since the
initial addition of this file in commit b14f8ab28449 ("exofs: Kbuild,
Headers and osd utils").

Reported-by: Nick Desaulniers <ndesaulniers@...gle.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
Acked-by: Boaz Harrosh <ooo@...ctrozaur.com>
---

Andrew, could you please pick this up? This warning is rather noisy when
doing allyesconfig builds.

 fs/exofs/common.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/exofs/common.h b/fs/exofs/common.h
index 7d88ef566213..45da96a1528d 100644
--- a/fs/exofs/common.h
+++ b/fs/exofs/common.h
@@ -183,7 +183,7 @@ struct exofs_fcb {
 #define EXOFS_INO_ATTR_SIZE	sizeof(struct exofs_fcb)
 
 /* This is the Attribute the fcb is stored in */
-static const struct __weak osd_attr g_attr_inode_data = ATTR_DEF(
+static const struct osd_attr g_attr_inode_data = ATTR_DEF(
 	EXOFS_APAGE_FS_DATA,
 	EXOFS_ATTR_INODE_DATA,
 	EXOFS_INO_ATTR_SIZE);
-- 
2.20.1