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[PATCH] i386 cpu hotplug: don't access freed memory

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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>
This commit is contained in:
Chuck Ebbert
2006-02-04 23:28:03 -08:00
committed by Linus Torvalds
parent 170aa3d026
commit fe38d8553c
9 changed files with 77 additions and 3 deletions
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10
arch/i386/kernel/cpu/transmeta.c
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@@ -84,7 +84,7 @@ static void __init init_transmeta(struct cpuinfo_x86 *c)
#endif
}
static void transmeta_identify(struct cpuinfo_x86 * c)
static void __init transmeta_identify(struct cpuinfo_x86 * c)
{
u32 xlvl;
generic_identify(c);
@@ -111,3 +111,11 @@ int __init transmeta_init_cpu(void)
}
//early_arch_initcall(transmeta_init_cpu);
static int __init transmeta_exit_cpu(void)
{
cpu_devs[X86_VENDOR_TRANSMETA] = NULL;
return 0;
}
late_initcall(transmeta_exit_cpu);