linux-kernel - [PATCH v2 1/5] perf tools: [uclibc] fix statfs.f

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Message-ID: <1420888254-17504-2-git-send-email-vgupta@synopsys.com>
Date:	Sat, 10 Jan 2015 16:40:50 +0530
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	<acme@...hat.com>, <namhyung@...nel.org>
CC:	<peterz@...radead.org>, <jolsa@...nel.org>, <mingo@...nel.org>,
	<linux-kernel@...r.kernel.org>, <linux-perf-users@...r.kernel.org>,
	<linux-arch@...r.kernel.org>, <Alexey.Brodkin@...opsys.com>,
	Borislav Petkov <bp@...e.de>, Cody P Schafer <dev@...yps.com>,
	Vineet Gupta <Vineet.Gupta1@...opsys.com>
Subject: [PATCH v2 1/5] perf tools: [uclibc] fix statfs.f_type data type mismatch build error

From: Alexey Brodkin <abrodkin@...opsys.com>

ARC Linux uses the no legacy syscalls abi and corresponding uClibc headers
statfs defines f_type to be U32 which causes perf build breakage

http://git.uclibc.org/uClibc/tree/libc/sysdeps/linux/common-generic/bits/statfs.h

----------->8---------------
  CC       fs/fs.o
fs/fs.c: In function 'fs__valid_mount':
fs/fs.c:82:24: 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
----------->8---------------

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>
Cc: linux-perf-users@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Alexey Brodkin <abrodkin@...opsys.com>

---
v3: Changes since v2 [2]
 * Made Changelog a bit more concise, no code changes [vgupta]

v2: Changes since v1 [1]
 * Added type cast to DEBUGFS_MAGIC in "debugfs.c" [Arnaldo]
 * Added verbose explanation of root cause

[2] https://lkml.org/lkml/2014/9/16/296
[1] https://lkml.org/lkml/2014/8/13/529

Signed-off-by: Vineet Gupta <vgupta@...opsys.com>
---
 tools/lib/api/fs/debugfs.c | 2 +-
 tools/lib/api/fs/fs.c      | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/lib/api/fs/debugfs.c b/tools/lib/api/fs/debugfs.c
index a74fba6d7743..93aa4cd2416f 100644
--- a/tools/lib/api/fs/debugfs.c
+++ b/tools/lib/api/fs/debugfs.c
@@ -67,7 +67,7 @@ int debugfs_valid_mountpoint(const char *debugfs)
 
 	if (statfs(debugfs, &st_fs) < 0)
 		return -ENOENT;
-	else if (st_fs.f_type != (long) DEBUGFS_MAGIC)
+	else if ((long) st_fs.f_type != (long) DEBUGFS_MAGIC)
 		return -ENOENT;
 
 	return 0;
diff --git a/tools/lib/api/fs/fs.c b/tools/lib/api/fs/fs.c
index 65d9be3f9887..15e64921ea84 100644
--- a/tools/lib/api/fs/fs.c
+++ b/tools/lib/api/fs/fs.c
@@ -79,7 +79,7 @@ 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;
-- 
1.9.1

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