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| author | Cyrill Gorcunov <gorcunov@gmail.com> | 2008-10-22 18:00:09 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-10-22 16:56:16 +0200 |
| commit | db96b0a0e4158806fcf03945a870f9320e6bac9b (patch) | |
| tree | 3697acccd698b9dcfc51995ed3855116863bb67d /arch | |
| parent | 8d433c407dea248c8db09edbc0b3c245977d596f (diff) | |
| download | linux-db96b0a0e4158806fcf03945a870f9320e6bac9b.tar.gz linux-db96b0a0e4158806fcf03945a870f9320e6bac9b.tar.xz | |
x86: do_boot_cpu - check if we have ESR register
Impact: fix APIC IRQ irregularities on certain older boxes
We should touch the APIC ESR register if only we have it.
The patch fixes the problem mentioned by Max Kellermann:
http://lkml.org/lkml/2008/10/17/147
Bisected-by: Max Kellermann <mk@cm4all.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
[ mingo@elte.hu: build fix ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/smpboot.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index 7ece815ea637..7b1093397319 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -893,9 +893,11 @@ do_rest: smpboot_setup_warm_reset_vector(start_ip); /* * Be paranoid about clearing APIC errors. - */ - apic_write(APIC_ESR, 0); - apic_read(APIC_ESR); + */ + if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) { + apic_write(APIC_ESR, 0); + apic_read(APIC_ESR); + } } /* |