Messages in this thread Patch in this message |  | | Date | Wed, 22 Jan 2003 00:25:41 -0500 (EST) | From | Zwane Mwaikambo <> | Subject | [PATCH][2.5][7/18] smp_call_function_on_cpu - mips |
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Index: linux-2.5.59/arch/mips/kernel/smp.c =================================================================== RCS file: /build/cvsroot/linux-2.5.59/arch/mips/kernel/smp.c,v retrieving revision 1.1.1.1 diff -u -r1.1.1.1 smp.c --- linux-2.5.59/arch/mips/kernel/smp.c 17 Jan 2003 11:14:52 -0000 1.1.1.1 +++ linux-2.5.59/arch/mips/kernel/smp.c 22 Jan 2003 00:38:02 -0000 @@ -182,7 +182,7 @@ void FASTCALL(smp_send_reschedule(int cpu)) { - smp_call_function(reschedule_this_cpu, NULL, 0, 0); + smp_call_function(reschedule_this_cpu, NULL, 0); } @@ -193,8 +193,7 @@ * You must not call this function with disabled interrupts or from a * hardware interrupt handler or from a bottom half handler. */ -int smp_call_function (void (*func) (void *info), void *info, int retry, - int wait) +int smp_call_function (void (*func) (void *info), void *info, int wait) { int cpus = smp_num_cpus - 1; int i; @@ -224,6 +223,53 @@ return 0; } +/* + * smp_call_function_on_cpu - Runs func on all processors in the mask + * + * @func: The function to run. This must be fast and non-blocking. + * @info: An arbitrary pointer to pass to the function. + * @wait: If true, wait (atomically) until function has completed on other CPUs. + * @mask The bitmask of CPUs to call the function + * + * Returns 0 on success, else a negative status code. Does not return until + * remote CPUs are nearly ready to execute func or have executed it. + * + * You must not call this function with disabled interrupts or from a + * hardware interrupt handler or from a bottom half handler. + */ + +int smp_call_function_on_cpu (void (*func) (void *info), void *info, int wait, + unsigned long mask) +{ + int cpu, i, num_cpus = hweight32(mask); + + cpu = get_cpu(); + if (((1UL << cpu) & mask) || num_cpus == 0) { + put_cpu_no_resched(); + return -EINVAL; + } + + spin_lock(&smp_fn_call.lock); + + atomic_set(&smp_fn_call.finished, 0); + smp_fn_call.fn = func; + smp_fn_call.data = info; + + for (i = 0; i < NR_CPUS; i++) { + if (cpu_online(i) && ((1UL << i) & mask)) + /* Call the board specific routine */ + core_call_function(i); + } + + if (wait) { + while(atomic_read(&smp_fn_call.finished) != num_cpus) {} + } + + spin_unlock(&smp_fn_call.lock); + put_cpu_no_resched(); + return 0; +} + void synchronize_irq(void) { panic("synchronize_irq"); @@ -237,7 +283,7 @@ void smp_send_stop(void) { - smp_call_function(stop_this_cpu, NULL, 1, 0); + smp_call_function(stop_this_cpu, NULL, 0); smp_num_cpus = 1; } -- function.linuxpower.ca
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