linux-kernel - [PATCH] perf tools: fix type mismatch

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Date:	Wed, 13 Aug 2014 21:03:49 +0400
From:	Alexey Brodkin <Alexey.Brodkin@...opsys.com>
To:	linux-kernel@...r.kernel.org
Cc:	Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
	Vineet Gupta <Vineet.Gupta1@...opsys.com>,
	Borislav Petkov <bp@...e.de>, Jiri Olsa <jolsa@...nel.org>,
	Cody P Schafer <dev@...yps.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH] perf tools: fix type mismatch - long vs __statfs_word

>From "include/uapi/asm-generic/statfs.h" it is seen that "statfs.f_type" is of
type "__statfs_word" which in its turn is "__u32" (unsigned int) for 32-bit
systems.

So in case of compilation with "-Werror" following breakage happens:
--->---
fs.c: In function ‘fs__valid_mount’:
fs.c:76:24: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
  else if (st_fs.f_type != magic)
                        ^
cc1: all warnings being treated as errors
--->---

Note that now when fs.c is in "lib/api/fs" and in "tools/lib/api/Makefile"
CFLAGS has hard-coded "-Werror" this is inevitable even if one builds "perf"
with "WERROR=0".

Signed-off-by: Alexey Brodkin <abrodkin@...opsys.com>

Cc: Vineet Gupta <vgupta@...opsys.com>
Cc: Borislav Petkov <bp@...e.de>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Cody P Schafer <dev@...yps.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/lib/api/fs/fs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/lib/api/fs/fs.c b/tools/lib/api/fs/fs.c
index c1b49c3..4b2fa7b 100644
--- a/tools/lib/api/fs/fs.c
+++ b/tools/lib/api/fs/fs.c
@@ -75,7 +75,7 @@ static int fs__valid_mount(const char *fs, long magic)
 
 	if (statfs(fs, &st_fs) < 0)
 		return -ENOENT;
-	else if (st_fs.f_type != magic)
+	else if ((long)st_fs.f_type != magic)
 		return -ENOENT;
 
 	return 0;
-- 
1.9.3

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