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35 lines
1.3 KiB
Diff
35 lines
1.3 KiB
Diff
From d4490efed068a552e8b67d52a0726458a224c9a0 Mon Sep 17 00:00:00 2001
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From: Frank Arnold <frank.arnold@amd.com>
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Date: Wed, 8 Dec 2010 17:39:14 +0100
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Subject: [PATCH 3/8] cpufrequtils aperf: Fix MSR read on 32-bit
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The cpufreq-aperf command does not work on 32-bit systems. The reason
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for that is a wrong count argument passed to the read() call. Instead
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of the buffer size, the size of the pointer to the buffer is used. On
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64-bit systems this just happened to work, because we need to read an
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8 byte value and a pointer has a size of 8 bytes on 64-bit. On 32-bit
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systems only 4 bytes are read, which then triggers the error path.
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Signed-off-by: Frank Arnold <frank.arnold@amd.com>
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Reviewed-by: Thomas Renninger <trenn@suse.de>
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Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
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---
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utils/aperf.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/utils/aperf.c b/utils/aperf.c
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index 1c64501..6302f5a 100644
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--- a/utils/aperf.c
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+++ b/utils/aperf.c
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@@ -100,7 +100,7 @@ static int read_msr(int cpu, unsigned int idx, unsigned long long *val)
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return -1;
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if (lseek(fd, idx, SEEK_CUR) == -1)
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goto err;
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- if (read(fd, val, sizeof val) != sizeof *val)
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+ if (read(fd, val, sizeof *val) != sizeof *val)
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goto err;
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close(fd);
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return 0;
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--
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1.7.10
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