diff options
| author | Don Zickus <dzickus@redhat.com> | 2011-02-07 23:25:00 -0500 |
|---|---|---|
| committer | AK <andi@firstfloor.org> | 2011-03-31 11:58:15 -0700 |
| commit | 71f4fa9d7193a64da840be62cc4de3b7e1c6f43c (patch) | |
| tree | f532c336431b2fd14459aafcb82e4335da8ca925 /arch/x86 | |
| parent | dc85a0dd595f342727bdae2ab72b6e860b8c38ab (diff) | |
x86: Use u32 instead of long to set reset vector back to 0
commit 299c56966a72b9109d47c71a6db52097098703dd upstream.
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>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
LKML-Reference: <1297139100-424-1-git-send-email-dzickus@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/include/asm/smpboot_hooks.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/include/asm/smpboot_hooks.h b/arch/x86/include/asm/smpboot_hooks.h index 1def6011490..cfdc6c88c9d 100644 --- a/arch/x86/include/asm/smpboot_hooks.h +++ b/arch/x86/include/asm/smpboot_hooks.h @@ -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) |