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x86: Use u32 instead of long to set reset vector back to 0

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A customer of ours, complained that when setting the reset
vector back to 0, it trashed other data and hung their box.
They noticed when only 4 bytes were set to 0 instead of 8,
everything worked correctly.

Mathew pointed out:

 |
 | We're supposed to be resetting trampoline_phys_low and
 | trampoline_phys_high here, which are two 16-bit values.
 | Writing 64 bits is definitely going to overwrite space
 | that we're not supposed to be touching.
 |

So limit the area modified to u32.

Signed-off-by: Don Zickus <dzickus@redhat.com>
Acked-by: Matthew Garrett <mjg@redhat.com>
Cc: <stable@kernel.org>
LKML-Reference: <1297139100-424-1-git-send-email-dzickus@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Don Zickus 2011-02-07 23:25:00 -05:00 committed by Ingo Molnar
parent 493f3358cb
commit 299c56966a
1 changed files with 1 additions and 1 deletions
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2
arch/x86/include/asm/smpboot_hooks.h
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@ -34,7 +34,7 @@ static inline void smpboot_restore_warm_reset_vector(void)
*/
CMOS_WRITE(0, 0xf);
*((volatile long *)phys_to_virt(apic->trampoline_phys_low)) = 0;
*((volatile u32 *)phys_to_virt(apic->trampoline_phys_low)) = 0;
}
static inline void __init smpboot_setup_io_apic(void)