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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2015-08-25 19:01:05 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-08-25 19:01:05 +0300 |
| commit | b1713b135fb1ae4d52531a55f0687f985bffe271 (patch) | |
| tree | ffec3bb733ca10d3f7a11f8febb2377b3aec04d4 /arch | |
| parent | 883985f61246ff7457325da454886bf71e40058c (diff) | |
| parent | a57e456a7b28431b55e407e5ab78ebd5b378d19e (diff) | |
| download | linux-b1713b135fb1ae4d52531a55f0687f985bffe271.tar.xz | |
Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fix from Thomas Gleixner:
"A single fix for a APIC regression introduced in 4.0 which went
undetected until now.
I screwed up the x2apic cleanup in a subtle way. The screwup is only
visible on systems which have x2apic preenabled in the BIOS and need
to disable it during boot"
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/apic: Fix fallout from x2apic cleanup
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/apic/apic.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c index dcb52850a28f..cde732c1b495 100644 --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -1424,7 +1424,7 @@ static inline void __x2apic_disable(void) { u64 msr; - if (cpu_has_apic) + if (!cpu_has_apic) return; rdmsrl(MSR_IA32_APICBASE, msr); @@ -1483,10 +1483,13 @@ void x2apic_setup(void) static __init void x2apic_disable(void) { - u32 x2apic_id; + u32 x2apic_id, state = x2apic_state; - if (x2apic_state != X2APIC_ON) - goto out; + x2apic_mode = 0; + x2apic_state = X2APIC_DISABLED; + + if (state != X2APIC_ON) + return; x2apic_id = read_apic_id(); if (x2apic_id >= 255) @@ -1494,9 +1497,6 @@ static __init void x2apic_disable(void) __x2apic_disable(); register_lapic_address(mp_lapic_addr); -out: - x2apic_state = X2APIC_DISABLED; - x2apic_mode = 0; } static __init void x2apic_enable(void) |