From 9f0e8d0400d925c3acd5f4e01dbeb736e4011882 Mon Sep 17 00:00:00 2001 From: Mike Travis Date: Fri, 4 Apr 2008 18:11:01 -0700 Subject: x86: convert cpumask_of_cpu macro to allocated array * Here is a simple patch to use an allocated array of cpumasks to represent cpumask_of_cpu() instead of constructing one on the stack. It's based on the Kconfig option "HAVE_CPUMASK_OF_CPU_MAP" which is currently only set for x86_64 SMP. Otherwise the the existing cpumask_of_cpu() is used but has been changed to produce an lvalue so a pointer to it can be used. Cc: H. Peter Anvin Signed-off-by: Christoph Lameter Signed-off-by: Mike Travis Signed-off-by: Ingo Molnar --- arch/x86/Kconfig | 3 +++ arch/x86/kernel/setup.c | 28 +++++++++++++++++++++++++++- 2 files changed, 30 insertions(+), 1 deletion(-) (limited to 'arch') diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 2a59dbb2824..7f30b754bfc 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -117,6 +117,9 @@ config ARCH_HAS_CPU_RELAX config HAVE_SETUP_PER_CPU_AREA def_bool X86_64 || (X86_SMP && !X86_VOYAGER) +config HAVE_CPUMASK_OF_CPU_MAP + def_bool X86_64_SMP + config ARCH_HIBERNATION_POSSIBLE def_bool y depends on !SMP || !X86_VOYAGER diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index ed157c90412..0d1f44ae6ee 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -54,6 +54,24 @@ static void __init setup_per_cpu_maps(void) #endif } +#ifdef CONFIG_HAVE_CPUMASK_OF_CPU_MAP +cpumask_t *cpumask_of_cpu_map __read_mostly; +EXPORT_SYMBOL(cpumask_of_cpu_map); + +/* requires nr_cpu_ids to be initialized */ +static void __init setup_cpumask_of_cpu(void) +{ + int i; + + /* alloc_bootmem zeroes memory */ + cpumask_of_cpu_map = alloc_bootmem_low(sizeof(cpumask_t) * nr_cpu_ids); + for (i = 0; i < nr_cpu_ids; i++) + cpu_set(i, cpumask_of_cpu_map[i]); +} +#else +static inline void setup_cpumask_of_cpu(void) { } +#endif + #ifdef CONFIG_X86_32 /* * Great future not-so-futuristic plan: make i386 and x86_64 do it @@ -70,7 +88,7 @@ EXPORT_SYMBOL(__per_cpu_offset); */ void __init setup_per_cpu_areas(void) { - int i; + int i, highest_cpu = 0; unsigned long size; #ifdef CONFIG_HOTPLUG_CPU @@ -104,10 +122,18 @@ void __init setup_per_cpu_areas(void) __per_cpu_offset[i] = ptr - __per_cpu_start; #endif memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start); + + highest_cpu = i; } + nr_cpu_ids = highest_cpu + 1; + printk(KERN_DEBUG "NR_CPUS: %d, nr_cpu_ids: %d\n", NR_CPUS, nr_cpu_ids); + /* Setup percpu data maps */ setup_per_cpu_maps(); + + /* Setup cpumask_of_cpu map */ + setup_cpumask_of_cpu(); } #endif -- cgit v1.2.3-70-g09d2