Messages in this thread Patch in this message | | | Date | Mon, 15 Sep 2008 19:05:18 +0400 | From | Cyrill Gorcunov <> | Subject | [PATCH] x86: do_boot_cpu - check for ESR apic register presence before touching |
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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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