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author | Chuck Ebbert <76306.1226@compuserve.com> | 2006-02-04 23:28:03 -0800 |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-02-05 11:06:53 -0800 |
commit | fe38d8553ccb5237bf0eddda9e94fbca7288551c (patch) | |
tree | 4ebdcf473fcf7e429536e86346c258514671f044 /arch/i386/kernel/cpu/umc.c | |
parent | 170aa3d02614ae621d54af10555e2f48977ae8de (diff) | |
download | blackbird-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.c | 8 |
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); |