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authorChuck Ebbert <76306.1226@compuserve.com>2006-02-04 23:28:03 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-05 11:06:53 -0800
commitfe38d8553ccb5237bf0eddda9e94fbca7288551c (patch)
tree4ebdcf473fcf7e429536e86346c258514671f044 /arch/i386/kernel/cpu/umc.c
parent170aa3d02614ae621d54af10555e2f48977ae8de (diff)
downloadblackbird-op-linux-fe38d8553ccb5237bf0eddda9e94fbca7288551c.tar.gz
blackbird-op-linux-fe38d8553ccb5237bf0eddda9e94fbca7288551c.zip
[PATCH] i386 cpu hotplug: don't access freed memory
i386 CPU init code accesses freed init memory when booting a newly-started processor after CPU hotplug. The cpu_devs array is searched to find the vendor and it contains pointers to freed data. Fix that by: 1. Zeroing entries for freed vendor data after bootup. 2. Changing Transmeta, NSC and UMC to all __init[data]. 3. Printing a warning (once only) and setting this_cpu to a safe default when the vendor is not found. This does not change behavior for AMD systems. They were broken already but no error was reported. Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/i386/kernel/cpu/umc.c')
-rw-r--r--arch/i386/kernel/cpu/umc.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/i386/kernel/cpu/umc.c b/arch/i386/kernel/cpu/umc.c
index 264fcad559d5..2cd988f6dc55 100644
--- a/arch/i386/kernel/cpu/umc.c
+++ b/arch/i386/kernel/cpu/umc.c
@@ -31,3 +31,11 @@ int __init umc_init_cpu(void)
}
//early_arch_initcall(umc_init_cpu);
+
+static int __init umc_exit_cpu(void)
+{
+ cpu_devs[X86_VENDOR_UMC] = NULL;
+ return 0;
+}
+
+late_initcall(umc_exit_cpu);
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