linux-kernel - [PATCH 1/2] Fix detection of CPUs in sysfs

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Date:	Thu, 23 Sep 2010 16:38:06 -0500
From:	Shawn Bohrer <sbohrer@...advisors.com>
To:	arjan@...ux.intel.com, nhorman@...driver.com
Cc:	tomk@...advisors.com, danb@...advisors.com,
	linux-kernel@...r.kernel.org,
	Shawn Bohrer <sbohrer@...advisors.com>
Subject: [PATCH 1/2] Fix detection of CPUs in sysfs

Only count directories that match /sys/devices/system/cpu/cpu[0-9]+ as
CPUs.  Previously any directory that started with cpu was counted which
caused cpufreq and cpuidle to be counted as CPUs.

Signed-off-by: Shawn Bohrer <sbohrer@...advisors.com>
---
 cputree.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/cputree.c b/cputree.c
index 3b0c982..b879785 100644
--- a/cputree.c
+++ b/cputree.c
@@ -25,6 +25,7 @@
  */
 
 #include "config.h"
+#include <ctype.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
@@ -321,7 +322,7 @@ void parse_cpu_tree(void)
 		return;
 	do {
 		entry = readdir(dir);
-                if (entry && strlen(entry->d_name)>3 && strstr(entry->d_name,"cpu")) {
+                if (entry && !strncmp(entry->d_name,"cpu", 3) && isdigit(entry->d_name[3])) {
 			char new_path[PATH_MAX];
 			sprintf(new_path, "/sys/devices/system/cpu/%s", entry->d_name);
 			do_one_cpu(new_path);
-- 
1.6.5.2

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