linux-kernel - [PATCH] turbostat: Don't attempt to printf an off

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Message-ID: <20130810235518.GA9342@jtriplet-mobl1>
Date:	Sat, 10 Aug 2013 16:55:19 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	linux-kernel@...r.kernel.org
Cc:	Len Brown <len.brown@...el.com>, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org
Subject: [PATCH] turbostat: Don't attempt to printf an off_t with %zx

turbostat uses the format %zx to print an off_t.  However, %zx wants a
size_t, not an off_t.  On 32-bit targets, those refer to different
types, potentially even with different sizes.  Use %llx and a cast
instead, since printf does not have a length modifier for off_t.

Without this patch, when compiling for a 32-bit target:

turbostat.c: In function 'get_msr':
turbostat.c:231:3: warning: format '%zx' expects argument of type 'size_t', but argument 4 has type 'off_t' [-Wformat]

Signed-off-by: Josh Triplett <josh@...htriplett.org>
---
 tools/power/x86/turbostat/turbostat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index 5bf4a67..b10b8d2 100644
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -230,7 +230,7 @@ int get_msr(int cpu, off_t offset, unsigned long long *msr)
 	close(fd);
 
 	if (retval != sizeof *msr) {
-		fprintf(stderr, "%s offset 0x%zx read failed\n", pathname, offset);
+		fprintf(stderr, "%s offset 0x%llx read failed\n", pathname, (unsigned long long)offset);
 		return -1;
 	}
 
-- 
1.8.4.rc1

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