From 2b633e3fac5efada088b57d31e65401f22bcc18f Mon Sep 17 00:00:00 2001 From: Yinghai Lu Date: Wed, 10 Feb 2010 01:20:37 -0800 Subject: smp: Use nr_cpus= to set nr_cpu_ids early On x86, before prefill_possible_map(), nr_cpu_ids will be NR_CPUS aka CONFIG_NR_CPUS. Add nr_cpus= to set nr_cpu_ids. so we can simulate cpus <=8 are installed on normal config. -v2: accordging to Christoph, acpi_numa_init should use nr_cpu_ids in stead of NR_CPUS. -v3: add doc in kernel-parameters.txt according to Andrew. Signed-off-by: Yinghai Lu LKML-Reference: <1265793639-15071-34-git-send-email-yinghai@kernel.org> Acked-by: Linus Torvalds Signed-off-by: H. Peter Anvin Cc: Tony Luck --- arch/ia64/kernel/acpi.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'arch/ia64') diff --git a/arch/ia64/kernel/acpi.c b/arch/ia64/kernel/acpi.c index 40574ae11401..605a08b29721 100644 --- a/arch/ia64/kernel/acpi.c +++ b/arch/ia64/kernel/acpi.c @@ -881,8 +881,8 @@ __init void prefill_possible_map(void) possible = available_cpus + additional_cpus; - if (possible > NR_CPUS) - possible = NR_CPUS; + if (possible > nr_cpu_ids) + possible = nr_cpu_ids; printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n", possible, max((possible - available_cpus), 0)); -- cgit v1.2.3-70-g09d2 From ca4dbc668412d5fe039be3e26e8e717a616d1ca5 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Wed, 17 Feb 2010 18:49:54 -0800 Subject: xen: Remove unnecessary arch specific xen irq functions. Right now xen's use of the x86 and ia64 handle_irq is just bizarre and very fragile as it is very non-obvious the function exists and is is used by code out in drivers/.... Luckily using handle_irq is completely unnecessary, and we can just use the generic irq apis instead. This still leaves drivers/xen/events.c as a problematic user of the generic irq apis it has "static struct irq_info irq_info[NR_IRQS]" but that can be fixed some other time. Signed-off-by: Eric W. Biederman LKML-Reference: <4B7CAAD2.10803@kernel.org> Acked-by: Jeremy Fitzhardinge Cc: Ian Campbell Signed-off-by: H. Peter Anvin --- arch/ia64/include/asm/xen/events.h | 4 ---- drivers/xen/events.c | 8 ++++++-- 2 files changed, 6 insertions(+), 6 deletions(-) (limited to 'arch/ia64') diff --git a/arch/ia64/include/asm/xen/events.h b/arch/ia64/include/asm/xen/events.h index b8370c8b6198..baa74c82aa71 100644 --- a/arch/ia64/include/asm/xen/events.h +++ b/arch/ia64/include/asm/xen/events.h @@ -36,10 +36,6 @@ static inline int xen_irqs_disabled(struct pt_regs *regs) return !(ia64_psr(regs)->i); } -static inline void handle_irq(int irq, struct pt_regs *regs) -{ - __do_IRQ(irq); -} #define irq_ctx_init(cpu) do { } while (0) #endif /* _ASM_IA64_XEN_EVENTS_H */ diff --git a/drivers/xen/events.c b/drivers/xen/events.c index ce602dd09bc1..2f8413794d05 100644 --- a/drivers/xen/events.c +++ b/drivers/xen/events.c @@ -649,9 +649,13 @@ void xen_evtchn_do_upcall(struct pt_regs *regs) int bit_idx = __ffs(pending_bits); int port = (word_idx * BITS_PER_LONG) + bit_idx; int irq = evtchn_to_irq[port]; + struct irq_desc *desc; - if (irq != -1) - handle_irq(irq, regs); + if (irq != -1) { + desc = irq_to_desc(irq); + if (desc) + generic_handle_irq_desc(irq, desc); + } } } -- cgit v1.2.3-70-g09d2