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authorDave Jones <davej@redhat.com>2006-02-28 16:58:53 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-28 20:53:43 -0800
commit5cf6c541f5b3902bdcc2d311d70f8e730aaff1be (patch)
tree2298029c0e4d0e40853983d4e8f88627bb564947 /arch/i386
parentec72070b1201203387e0c32a23ed17e35a24b170 (diff)
[PATCH] x86 microcode driver vs hotplug CPUs.
This driver loops over 'num_online_cpus', but it doesn't account for holes in the online map created by offlined cpus, and assumes that the cpu numbers stay linear. Signed-off-by: Dave Jones <davej@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/i386')
-rw-r--r--arch/i386/kernel/microcode.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/arch/i386/kernel/microcode.c b/arch/i386/kernel/microcode.c
index d3fdf0057d8..5390b521aca 100644
--- a/arch/i386/kernel/microcode.c
+++ b/arch/i386/kernel/microcode.c
@@ -74,6 +74,7 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.h>
+#include <linux/cpumask.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
@@ -250,8 +251,8 @@ static int find_matching_ucodes (void)
error = -EINVAL;
goto out;
}
-
- for (cpu_num = 0; cpu_num < num_online_cpus(); cpu_num++) {
+
+ for_each_online_cpu(cpu_num) {
struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
if (uci->err != MC_NOTFOUND) /* already found a match or not an online cpu*/
continue;
@@ -293,7 +294,7 @@ static int find_matching_ucodes (void)
error = -EFAULT;
goto out;
}
- for (cpu_num = 0; cpu_num < num_online_cpus(); cpu_num++) {
+ for_each_online_cpu(cpu_num) {
struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
if (uci->err != MC_NOTFOUND) /* already found a match or not an online cpu*/
continue;
@@ -304,7 +305,9 @@ static int find_matching_ucodes (void)
}
}
/* now check if any cpu has matched */
- for (cpu_num = 0, allocated_flag = 0, sum = 0; cpu_num < num_online_cpus(); cpu_num++) {
+ allocated_flag = 0;
+ sum = 0;
+ for_each_online_cpu(cpu_num) {
if (ucode_cpu_info[cpu_num].err == MC_MARKED) {
struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
if (!allocated_flag) {
@@ -415,12 +418,12 @@ static int do_microcode_update (void)
}
out_free:
- for (i = 0; i < num_online_cpus(); i++) {
+ for_each_online_cpu(i) {
if (ucode_cpu_info[i].mc) {
int j;
void *tmp = ucode_cpu_info[i].mc;
vfree(tmp);
- for (j = i; j < num_online_cpus(); j++) {
+ for_each_online_cpu(j) {
if (ucode_cpu_info[j].mc == tmp)
ucode_cpu_info[j].mc = NULL;
}