From c4cb768f027706b3a0190309416b13f07114fe56 Mon Sep 17 00:00:00 2001 From: Marcelo Tosatti Date: Tue, 14 Apr 2009 18:08:37 -0300 Subject: [IA64] export smp_send_reschedule KVM will use smp_send_reschedule to force a cpu out of guest mode. Signed-off-by: Marcelo Tosatti Signed-off-by: Tony Luck diff --git a/arch/ia64/kernel/smp.c b/arch/ia64/kernel/smp.c index 2ea4199..c2d9823 100644 --- a/arch/ia64/kernel/smp.c +++ b/arch/ia64/kernel/smp.c @@ -225,6 +225,7 @@ smp_send_reschedule (int cpu) { platform_send_ipi(cpu, IA64_IPI_RESCHEDULE, IA64_IPI_DM_INT, 0); } +EXPORT_SYMBOL_GPL(smp_send_reschedule); /* * Called with preemption disabled. -- cgit v0.10.2 From edb91dc01a216e84b78721b71a06db1e0db141b7 Mon Sep 17 00:00:00 2001 From: Dimitri Sivanich Date: Wed, 15 Apr 2009 10:56:25 -0500 Subject: [IA64] smp_flush_tlb_mm() should only send IPI's to cpus in cpu_vm_mask Having flush_tlb_mm->smp_flush_tlb_mm() send an IPI to every cpu on the system is occasionally triggering spin_lock contention in generic_smp_call_function_interrupt(). Follow x86 arch's lead and only sends IPIs to the cpus in mm->cpu_vm_mask. Experiments with this change have shown significant improvement in this contention issue. Signed-off-by: Dimitri Sivanich Signed-off-by: Tony Luck diff --git a/arch/ia64/kernel/smp.c b/arch/ia64/kernel/smp.c index c2d9823..5230eaa 100644 --- a/arch/ia64/kernel/smp.c +++ b/arch/ia64/kernel/smp.c @@ -301,15 +301,12 @@ smp_flush_tlb_mm (struct mm_struct *mm) return; } + smp_call_function_mask(mm->cpu_vm_mask, + (void (*)(void *))local_finish_flush_tlb_mm, mm, 1); + local_irq_disable(); + local_finish_flush_tlb_mm(mm); + local_irq_enable(); preempt_enable(); - /* - * We could optimize this further by using mm->cpu_vm_mask to track which CPUs - * have been running in the address space. It's not clear that this is worth the - * trouble though: to avoid races, we have to raise the IPI on the target CPU - * anyhow, and once a CPU is interrupted, the cost of local_flush_tlb_all() is - * rather trivial. - */ - on_each_cpu((void (*)(void *))local_finish_flush_tlb_mm, mm, 1); } void arch_send_call_function_single_ipi(int cpu) -- cgit v0.10.2 From 05f0ecbda5c215279f8e0f852e1606f441a11236 Mon Sep 17 00:00:00 2001 From: Isaku Yamahata Date: Sat, 18 Apr 2009 12:15:23 +0900 Subject: [IA64] fix allmodconfig compilation breakage. This patch fixes the following compilation error caused by recursive inclusion of kernel.h which defines BUILD_BUG_ON(). In this case, the case it catches will be caught by the case CONFIG_PARAVIRT=n, so removing it would not hurt compile time check very much. So fix the breakage by removing it. CC arch/ia64/kernel/asm-offsets.s In file included from include/linux/bitops.h:17, from include/linux/kernel.h:15, from include/linux/sched.h:52, from arch/ia64/kernel/asm-offsets.c:9: arch/ia64/include/asm/bitops.h: In function 'set_bit': arch/ia64/include/asm/bitops.h:47: error: implicit declaration of function 'BUILD_BUG_ON' Signed-off-by: Isaku Yamahata Signed-off-by: Tony Luck diff --git a/arch/ia64/include/asm/paravirt_privop.h b/arch/ia64/include/asm/paravirt_privop.h index 3d29511..8f6cb11 100644 --- a/arch/ia64/include/asm/paravirt_privop.h +++ b/arch/ia64/include/asm/paravirt_privop.h @@ -445,7 +445,6 @@ paravirt_set_rr0_to_rr4(unsigned long val0, unsigned long val1, register unsigned long ia64_intri_res asm ("r8"); \ register unsigned long __reg asm ("r8") = (reg); \ \ - BUILD_BUG_ON(!__builtin_constant_p(reg)); \ asm volatile (paravirt_alt_bundle(__PARAVIRT_BR, \ PARAVIRT_TYPE(GETREG) \ + (reg)) \ @@ -464,7 +463,6 @@ paravirt_set_rr0_to_rr4(unsigned long val0, unsigned long val1, register unsigned long ia64_clobber1 asm ("r8"); \ register unsigned long ia64_clobber2 asm ("r9"); \ \ - BUILD_BUG_ON(!__builtin_constant_p(reg)); \ asm volatile (paravirt_alt_bundle(__PARAVIRT_BR, \ PARAVIRT_TYPE(SETREG) \ + (reg)) \ -- cgit v0.10.2