Messages in this thread Patch in this message | | | From | Rusty Russell <> | Subject | [PATCH 1/2] Make for_each_cpu() Iterator More Friendly | Date | Wed, 31 Dec 2003 12:26:34 +1100 |
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Please apply. Applies against 2.6.0-mm2 and 2.6.0-bk3. Yay!
Anton: breaks PPC64, as it needs cpu_possible_mask, but fix is already in Ameslab tree.
Name: Make for_each_cpu() more friendly. Author: Rusty Russell Status: Booted on 2.6.0
D: The for_each_cpu() and for_each_online_cpu() iterators take a mask, D: and noone uses them that way (except for arch/i386/mach-voyager, which D: uses for_each_cpu(cpu_online_mask). Make them more usable iterators, D: by dropping the "mask" arg. D: D: This requires that archs provide a cpu_possible_mask: most do, D: but PPC64 doesn't, so it is broken by this patch. The other archs D: use a #define to define it in asm/smp.h. D: D: Most places doing loops over cpus testing for cpu_online() should use D: for_each_cpu: it is synonymous at the moment, but with the CPU hotplug patch D: the difference becomes important. D: D: Followup patches will convert users. D: D: Thanks! D: Rusty.
diff -urpN --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal .18232-linux-2.6.0-bk3/arch/i386/mach-voyager/voyager_smp.c .18232-linux-2.6.0-bk3.updated/arch/i386/mach-voyager/voyager_smp.c --- .18232-linux-2.6.0-bk3/arch/i386/mach-voyager/voyager_smp.c 2003-11-24 15:42:27.000000000 +1100 +++ .18232-linux-2.6.0-bk3.updated/arch/i386/mach-voyager/voyager_smp.c 2003-12-31 11:39:42.000000000 +1100 @@ -130,7 +130,7 @@ send_QIC_CPI(__u32 cpuset, __u8 cpi) { int cpu; - for_each_cpu(cpu, cpu_online_map) { + for_each_online_cpu(cpu) { if(cpuset & (1<<cpu)) { #ifdef VOYAGER_DEBUG if(!cpu_isset(cpu, cpu_online_map)) @@ -1465,7 +1465,7 @@ send_CPI(__u32 cpuset, __u8 cpi) cpuset &= 0xff; /* only first 8 CPUs vaild for VIC CPI */ if(cpuset == 0) return; - for_each_cpu(cpu, cpu_online_map) { + for_each_online_cpu(cpu) { if(cpuset & (1<<cpu)) set_bit(cpi, &vic_cpi_mailbox[cpu]); } @@ -1579,7 +1579,7 @@ enable_vic_irq(unsigned int irq) VDEBUG(("VOYAGER: enable_vic_irq(%d) CPU%d affinity 0x%lx\n", irq, cpu, cpu_irq_affinity[cpu])); spin_lock_irqsave(&vic_irq_lock, flags); - for_each_cpu(real_cpu, cpu_online_map) { + for_each_online_cpu(real_cpu) { if(!(voyager_extended_vic_processors & (1<<real_cpu))) continue; if(!(cpu_irq_affinity[real_cpu] & mask)) { @@ -1720,7 +1720,7 @@ after_handle_vic_irq(unsigned int irq) int i; __u8 cpu = smp_processor_id(); __u8 real_cpu; - int mask; + int mask; /* Um... initialize me??? --RR */ printk("VOYAGER SMP: CPU%d lost interrupt %d\n", cpu, irq); @@ -1809,7 +1809,7 @@ set_vic_irq_affinity(unsigned int irq, c * bus) */ return; - for_each_cpu(cpu, cpu_online_map) { + for_each_online_cpu(cpu) { unsigned long cpu_mask = 1 << cpu; if(cpu_mask & real_mask) { @@ -1875,7 +1875,7 @@ voyager_smp_dump() int old_cpu = smp_processor_id(), cpu; /* dump the interrupt masks of each processor */ - for_each_cpu(cpu, cpu_online_map) { + for_each_online_cpu(cpu) { __u16 imr, isr, irr; unsigned long flags; diff -urpN --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal .18232-linux-2.6.0-bk3/include/asm-alpha/smp.h .18232-linux-2.6.0-bk3.updated/include/asm-alpha/smp.h --- .18232-linux-2.6.0-bk3/include/asm-alpha/smp.h 2003-09-29 10:25:56.000000000 +1000 +++ .18232-linux-2.6.0-bk3.updated/include/asm-alpha/smp.h 2003-12-31 11:39:43.000000000 +1100 @@ -48,8 +48,8 @@ extern struct cpuinfo_alpha cpu_data[NR_ extern cpumask_t cpu_present_mask; extern cpumask_t cpu_online_map; extern int smp_num_cpus; +#define cpu_possible_map cpu_present_map -#define cpu_possible(cpu) cpu_isset(cpu, cpu_present_mask) #define cpu_online(cpu) cpu_isset(cpu, cpu_online_map) extern int smp_call_function_on_cpu(void (*func) (void *info), void *info,int retry, int wait, unsigned long cpu); diff -urpN --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal .18232-linux-2.6.0-bk3/include/asm-i386/smp.h .18232-linux-2.6.0-bk3.updated/include/asm-i386/smp.h --- .18232-linux-2.6.0-bk3/include/asm-i386/smp.h 2003-09-22 10:28:12.000000000 +1000 +++ .18232-linux-2.6.0-bk3.updated/include/asm-i386/smp.h 2003-12-31 11:39:43.000000000 +1100 @@ -53,8 +53,7 @@ extern void zap_low_mappings (void); #define smp_processor_id() (current_thread_info()->cpu) extern cpumask_t cpu_callout_map; - -#define cpu_possible(cpu) cpu_isset(cpu, cpu_callout_map) +#define cpu_possible_map cpu_callout_map /* We don't mark CPUs online until __cpu_up(), so we need another measure */ static inline int num_booting_cpus(void) diff -urpN --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal .18232-linux-2.6.0-bk3/include/asm-ia64/smp.h .18232-linux-2.6.0-bk3.updated/include/asm-ia64/smp.h --- .18232-linux-2.6.0-bk3/include/asm-ia64/smp.h 2003-09-22 10:27:36.000000000 +1000 +++ .18232-linux-2.6.0-bk3.updated/include/asm-ia64/smp.h 2003-12-31 11:39:43.000000000 +1100 @@ -48,7 +48,7 @@ extern volatile int ia64_cpu_to_sapicid[ extern unsigned long ap_wakeup_vector; -#define cpu_possible(cpu) cpu_isset(cpu, phys_cpu_present_map) +#define cpu_possible_map phys_cpu_present_map /* * Function to map hard smp processor id to logical id. Slow, so don't use this in diff -urpN --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal .18232-linux-2.6.0-bk3/include/asm-mips/smp.h .18232-linux-2.6.0-bk3.updated/include/asm-mips/smp.h --- .18232-linux-2.6.0-bk3/include/asm-mips/smp.h 2003-09-22 10:27:36.000000000 +1000 +++ .18232-linux-2.6.0-bk3.updated/include/asm-mips/smp.h 2003-12-31 11:39:43.000000000 +1100 @@ -48,8 +48,8 @@ extern struct call_data_struct *call_dat extern cpumask_t phys_cpu_present_map; extern cpumask_t cpu_online_map; +#define cpu_possible_map phys_cpu_present_map -#define cpu_possible(cpu) cpu_isset(cpu, phys_cpu_present_map) #define cpu_online(cpu) cpu_isset(cpu, cpu_online_map) static inline unsigned int num_online_cpus(void) diff -urpN --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal .18232-linux-2.6.0-bk3/include/asm-parisc/smp.h .18232-linux-2.6.0-bk3.updated/include/asm-parisc/smp.h --- .18232-linux-2.6.0-bk3/include/asm-parisc/smp.h 2003-09-22 10:27:36.000000000 +1000 +++ .18232-linux-2.6.0-bk3.updated/include/asm-parisc/smp.h 2003-12-31 11:39:43.000000000 +1100 @@ -54,7 +54,7 @@ extern unsigned long cpu_present_mask; #define smp_processor_id() (current_thread_info()->cpu) #define cpu_online(cpu) cpu_isset(cpu, cpu_online_map) -#define cpu_possible(cpu) cpu_isset(cpu, cpu_present_mask) +#define cpu_possible_map cpu_present_map #endif /* CONFIG_SMP */ diff -urpN --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal .18232-linux-2.6.0-bk3/include/asm-ppc/smp.h .18232-linux-2.6.0-bk3.updated/include/asm-ppc/smp.h --- .18232-linux-2.6.0-bk3/include/asm-ppc/smp.h 2003-09-22 10:27:36.000000000 +1000 +++ .18232-linux-2.6.0-bk3.updated/include/asm-ppc/smp.h 2003-12-31 11:39:43.000000000 +1100 @@ -48,7 +48,6 @@ extern void smp_local_timer_interrupt(st #define smp_processor_id() (current_thread_info()->cpu) #define cpu_online(cpu) cpu_isset(cpu, cpu_online_map) -#define cpu_possible(cpu) cpu_isset(cpu, cpu_possible_map) extern int __cpu_up(unsigned int cpu); diff -urpN --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal .18232-linux-2.6.0-bk3/include/asm-s390/smp.h .18232-linux-2.6.0-bk3.updated/include/asm-s390/smp.h --- .18232-linux-2.6.0-bk3/include/asm-s390/smp.h 2003-09-29 10:26:01.000000000 +1000 +++ .18232-linux-2.6.0-bk3.updated/include/asm-s390/smp.h 2003-12-31 11:39:43.000000000 +1100 @@ -49,7 +49,6 @@ extern cpumask_t cpu_possible_map; #define smp_processor_id() (S390_lowcore.cpu_data.cpu_nr) #define cpu_online(cpu) cpu_isset(cpu, cpu_online_map) -#define cpu_possible(cpu) cpu_isset(cpu, cpu_possible_map) extern __inline__ __u16 hard_smp_processor_id(void) { diff -urpN --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal .18232-linux-2.6.0-bk3/include/asm-sh/smp.h .18232-linux-2.6.0-bk3.updated/include/asm-sh/smp.h --- .18232-linux-2.6.0-bk3/include/asm-sh/smp.h 2003-09-22 10:23:00.000000000 +1000 +++ .18232-linux-2.6.0-bk3.updated/include/asm-sh/smp.h 2003-12-31 11:39:43.000000000 +1100 @@ -16,7 +16,6 @@ extern unsigned long cpu_online_map; #define cpu_online(cpu) (cpu_online_map & (1 << (cpu))) -#define cpu_possible(cpu) (cpu_online(cpu)) #define smp_processor_id() (current_thread_info()->cpu) diff -urpN --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal .18232-linux-2.6.0-bk3/include/asm-sparc64/smp.h .18232-linux-2.6.0-bk3.updated/include/asm-sparc64/smp.h --- .18232-linux-2.6.0-bk3/include/asm-sparc64/smp.h 2003-09-22 10:27:37.000000000 +1000 +++ .18232-linux-2.6.0-bk3.updated/include/asm-sparc64/smp.h 2003-12-31 11:39:43.000000000 +1100 @@ -33,7 +33,7 @@ extern unsigned char boot_cpu_id; extern cpumask_t phys_cpu_present_map; -#define cpu_possible(cpu) cpu_isset(cpu, phys_cpu_present_map) +#define cpu_possible_map phys_cpu_present_map #define cpu_online(cpu) cpu_isset(cpu, cpu_online_map) diff -urpN --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal .18232-linux-2.6.0-bk3/include/asm-um/smp.h .18232-linux-2.6.0-bk3.updated/include/asm-um/smp.h --- .18232-linux-2.6.0-bk3/include/asm-um/smp.h 2003-09-22 10:27:37.000000000 +1000 +++ .18232-linux-2.6.0-bk3.updated/include/asm-um/smp.h 2003-12-31 11:39:43.000000000 +1100 @@ -20,7 +20,7 @@ extern int hard_smp_processor_id(void); #define cpu_online(cpu) cpu_isset(cpu, cpu_online_map) extern int ncpus; -#define cpu_possible(cpu) (cpu < ncpus) + extern inline void smp_cpus_done(unsigned int maxcpus) { diff -urpN --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal .18232-linux-2.6.0-bk3/include/asm-x86_64/smp.h .18232-linux-2.6.0-bk3.updated/include/asm-x86_64/smp.h --- .18232-linux-2.6.0-bk3/include/asm-x86_64/smp.h 2003-11-24 15:42:33.000000000 +1100 +++ .18232-linux-2.6.0-bk3.updated/include/asm-x86_64/smp.h 2003-12-31 11:39:43.000000000 +1100 @@ -57,8 +57,7 @@ void smp_stop_cpu(void); */ extern cpumask_t cpu_callout_map; - -#define cpu_possible(cpu) cpu_isset(cpu, cpu_callout_map) +#define cpu_possible_map cpu_callout_map #define cpu_online(cpu) cpu_isset(cpu, cpu_online_map) static inline int num_booting_cpus(void) diff -urpN --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal .18232-linux-2.6.0-bk3/include/linux/cpumask.h .18232-linux-2.6.0-bk3.updated/include/linux/cpumask.h --- .18232-linux-2.6.0-bk3/include/linux/cpumask.h 2003-12-31 10:04:40.000000000 +1100 +++ .18232-linux-2.6.0-bk3.updated/include/linux/cpumask.h 2003-12-31 11:40:59.000000000 +1100 @@ -8,32 +8,28 @@ #ifdef CONFIG_SMP extern cpumask_t cpu_online_map; +extern cpumask_t cpu_possible_map; #define num_online_cpus() cpus_weight(cpu_online_map) #define cpu_online(cpu) cpu_isset(cpu, cpu_online_map) +#define cpu_possible(cpu) cpu_isset(cpu, cpu_possible_map) + +#define for_each_cpu_mask(cpu, mask) \ + for (cpu = first_cpu_const(mask); \ + cpu < NR_CPUS; \ + cpu = next_cpu_const(cpu, mask)) + +#define for_each_cpu(cpu) for_each_cpu_mask(cpu, cpu_possible_map) +#define for_each_online_cpu(cpu) for_each_cpu_mask(cpu, cpu_online_map) #else #define cpu_online_map cpumask_of_cpu(0) #define num_online_cpus() 1 #define cpu_online(cpu) ({ BUG_ON((cpu) != 0); 1; }) -#endif - -static inline int next_online_cpu(int cpu, cpumask_t map) -{ - do - cpu = next_cpu_const(cpu, mk_cpumask_const(map)); - while (cpu < NR_CPUS && !cpu_online(cpu)); - return cpu; -} - -#define for_each_cpu(cpu, map) \ - for (cpu = first_cpu_const(mk_cpumask_const(map)); \ - cpu < NR_CPUS; \ - cpu = next_cpu_const(cpu,mk_cpumask_const(map))) +#define cpu_possible(cpu) ({ BUG_ON((cpu) != 0); 1; }) -#define for_each_online_cpu(cpu, map) \ - for (cpu = first_cpu_const(mk_cpumask_const(map)); \ - cpu < NR_CPUS; \ - cpu = next_online_cpu(cpu,map)) +#define for_each_cpu(cpu) for (cpu = 0; cpu < 1; cpu++) +#define for_each_online_cpu(cpu) for (cpu = 0; cpu < 1; cpu++) +#endif extern int __mask_snprintf_len(char *buf, unsigned int buflen, const unsigned long *maskp, unsigned int maskbytes); diff -urpN --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal .18232-linux-2.6.0-bk3/include/linux/smp.h .18232-linux-2.6.0-bk3.updated/include/linux/smp.h --- .18232-linux-2.6.0-bk3/include/linux/smp.h 2003-09-22 10:27:37.000000000 +1000 +++ .18232-linux-2.6.0-bk3.updated/include/linux/smp.h 2003-12-31 11:39:43.000000000 +1100 @@ -103,7 +103,6 @@ void smp_prepare_boot_cpu(void); #define on_each_cpu(func,info,retry,wait) ({ func(info); 0; }) static inline void smp_send_reschedule(int cpu) { } #define num_booting_cpus() 1 -#define cpu_possible(cpu) ({ BUG_ON((cpu) != 0); 1; }) #define smp_prepare_boot_cpu() do {} while (0) #endif /* !SMP */ -- Anyone who quotes me in their sig is an idiot. -- Rusty Russell. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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