Messages in this thread Patch in this message | | | Date | Fri, 14 Feb 2003 04:34:06 -0500 (EST) | From | Zwane Mwaikambo <> | Subject | [PATCH][2.5][13/14] smp_call_function_on_cpu - UML |
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smp.c | 31 ++++++++++++++++++++----------- 1 files changed, 20 insertions(+), 11 deletions(-)
Index: linux-2.5.60/arch/um/kernel/smp.c =================================================================== RCS file: /build/cvsroot/linux-2.5.60/arch/um/kernel/smp.c,v retrieving revision 1.1.1.1 diff -u -r1.1.1.1 smp.c --- linux-2.5.60/arch/um/kernel/smp.c 10 Feb 2003 22:15:17 -0000 1.1.1.1 +++ linux-2.5.60/arch/um/kernel/smp.c 14 Feb 2003 07:46:06 -0000 @@ -255,15 +255,19 @@ atomic_inc(&scf_finished); } -int smp_call_function(void (*_func)(void *info), void *_info, int nonatomic, - int wait) +int smp_call_function_on_cpu(void (*_func)(void *info), void *_info, int wait, + unsigned long mask) { - int cpus = num_online_cpus() - 1; - int i; - - if (!cpus) - return 0; + int i, cpu, num_cpus; + cpu = get_cpu(); + mask &= ~(1UL << cpu); + num_cpus = hweight32(mask); + if (num_cpus == 0) { + put_cpu_no_resched(); + return -EINVAL; + } + spin_lock_bh(&call_lock); atomic_set(&scf_started, 0); atomic_set(&scf_finished, 0); @@ -271,19 +275,24 @@ info = _info; for (i=0;i<NR_CPUS;i++) - if((i != current->thread_info->cpu) && - test_bit(i, &cpu_online_map)) + if (cpu_online(i) && ((1UL << i) & mask)) write(cpu_data[i].ipi_pipe[1], "C", 1); - while (atomic_read(&scf_started) != cpus) + while (atomic_read(&scf_started) != num_cpus) barrier(); if (wait) - while (atomic_read(&scf_finished) != cpus) + while (atomic_read(&scf_finished) != num_cpus) barrier(); spin_unlock_bh(&call_lock); + put_cpu_no_resched(); return 0; +} + +int smp_call_function(void (*_func)(void *info), void *_info, int wait) +{ + return smp_call_function_on_cpu(_func, _info, wait, cpu_online_map); } #endif - 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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