android_kernel_motorola_sm6225/arch/i386/kernel/cpu/umc.c
Chuck Ebbert fe38d8553c [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>
2006-02-05 11:06:53 -08:00

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C

#include <linux/kernel.h>
#include <linux/init.h>
#include <asm/processor.h>
#include "cpu.h"
/* UMC chips appear to be only either 386 or 486, so no special init takes place.
*/
static void __init init_umc(struct cpuinfo_x86 * c)
{
}
static struct cpu_dev umc_cpu_dev __initdata = {
.c_vendor = "UMC",
.c_ident = { "UMC UMC UMC" },
.c_models = {
{ .vendor = X86_VENDOR_UMC, .family = 4, .model_names =
{
[1] = "U5D",
[2] = "U5S",
}
},
},
.c_init = init_umc,
};
int __init umc_init_cpu(void)
{
cpu_devs[X86_VENDOR_UMC] = &umc_cpu_dev;
return 0;
}
//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);