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Subject[PATCH] x86: do_boot_cpu - check for ESR apic register presence before touching
We should check first if there is ESR register before read/write it.

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
---

Please review and test if possible. Thanks.

Index: linux-2.6.git/arch/x86/kernel/smpboot.c
===================================================================
--- linux-2.6.git.orig/arch/x86/kernel/smpboot.c 2008-09-14 21:49:36.000000000 +0400
+++ linux-2.6.git/arch/x86/kernel/smpboot.c 2008-09-15 18:30:37.000000000 +0400
@@ -893,8 +893,10 @@ do_rest:
/*
* Be paranoid about clearing APIC errors.
*/
- apic_write(APIC_ESR, 0);
- apic_read(APIC_ESR);
+ if (APIC_INTEGRATED(apic_version[phys_apicid])) {
+ apic_write(APIC_ESR, 0);
+ apic_read(APIC_ESR);
+ }
}

/*

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