From 0b6a39f7ebcb1c82587ce35b401c513eed41ac5c Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Mon, 9 Jun 2008 13:29:43 +0200 Subject: Revert "x86: fix ioapic bug again" MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This reverts commit 6e908947b4995bc0e551a8257c586d5c3e428201. Németh Márton reported: | there is a problem in 2.6.26-rc3 which was not there in case of | 2.6.25: the CPU wakes up ~90,000 times per sec instead of ~60 per sec. | | I also "git bisected" the problem, the result is: | | 6e908947b4995bc0e551a8257c586d5c3e428201 is first bad commit | commit 6e908947b4995bc0e551a8257c586d5c3e428201 | Author: Ingo Molnar | Date: Fri Mar 21 14:32:36 2008 +0100 | | x86: fix ioapic bug again the original problem is fixed by Maciej W. Rozycki in the tip/x86/apic branch (confirmed by Márton), but those changes are too intrusive for v2.6.26 so we'll go for the less intrusive (repeated) revert now. Reported-and-bisected-by: Németh Márton Signed-off-by: Ingo Molnar --- arch/x86/kernel/io_apic_32.c | 12 ++---------- 1 file changed, 2 insertions(+), 10 deletions(-) (limited to 'arch/x86/kernel/io_apic_32.c') diff --git a/arch/x86/kernel/io_apic_32.c b/arch/x86/kernel/io_apic_32.c index a40d54fc1fd..4dc8600d9d2 100644 --- a/arch/x86/kernel/io_apic_32.c +++ b/arch/x86/kernel/io_apic_32.c @@ -2130,14 +2130,10 @@ static inline void __init check_timer(void) { int apic1, pin1, apic2, pin2; int vector; - unsigned int ver; unsigned long flags; local_irq_save(flags); - ver = apic_read(APIC_LVR); - ver = GET_APIC_VERSION(ver); - /* * get/set the timer IRQ vector: */ @@ -2150,15 +2146,11 @@ static inline void __init check_timer(void) * mode for the 8259A whenever interrupts are routed * through I/O APICs. Also IRQ0 has to be enabled in * the 8259A which implies the virtual wire has to be - * disabled in the local APIC. Finally timer interrupts - * need to be acknowledged manually in the 8259A for - * timer_interrupt() and for the i82489DX when using - * the NMI watchdog. + * disabled in the local APIC. */ apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT); init_8259A(1); - timer_ack = !cpu_has_tsc; - timer_ack |= (nmi_watchdog == NMI_IO_APIC && !APIC_INTEGRATED(ver)); + timer_ack = 1; if (timer_over_8254 > 0) enable_8259A_irq(0); -- cgit v1.2.3-70-g09d2