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SubjectRe: [PATCH] cpumask_t
On Sun, Jan 19, 2003 at 02:18:52PM -0800, William Lee Irwin III wrote:
> This is just broken anyway. And fixing it isn't as obvious as just


Fix up several obvious stupidities. Atop the prior patch:

arch/i386/kernel/irq.c | 2 +-
arch/i386/kernel/smp.c | 7 +++++--
include/linux/cpumask.h | 6 +++---
3 files changed, 9 insertions(+), 6 deletions(-)


diff -urpN cpu-2.5.59-1/arch/i386/kernel/irq.c cpu-2.5.59-2/arch/i386/kernel/irq.c
--- cpu-2.5.59-1/arch/i386/kernel/irq.c 2003-01-19 13:27:24.000000000 -0800
+++ cpu-2.5.59-2/arch/i386/kernel/irq.c 2003-01-19 14:30:24.000000000 -0800
@@ -873,7 +873,7 @@ static int irq_affinity_write_proc (stru
* one online CPU still has to be targeted.
*/
cpus_and(tmp, new_value, cpu_online_map);
- if (!any_online_cpu(tmp))
+ if (!any_online_cpu(tmp) >= NR_CPUS)
return -EINVAL;

irq_affinity[irq] = new_value;
diff -urpN cpu-2.5.59-1/arch/i386/kernel/smp.c cpu-2.5.59-2/arch/i386/kernel/smp.c
--- cpu-2.5.59-1/arch/i386/kernel/smp.c 2003-01-19 12:23:52.000000000 -0800
+++ cpu-2.5.59-2/arch/i386/kernel/smp.c 2003-01-19 14:34:40.000000000 -0800
@@ -331,8 +331,9 @@ asmlinkage void smp_invalidate_interrupt
leave_mm(cpu);
}
ack_APIC_irq();
+ smp_mb__before_clear_bit();
cpu_clear(cpu, flush_cpumask);
-
+ smp_mb__after_clear_bit();
out:
put_cpu_no_resched();
}
@@ -370,6 +371,7 @@ static void flush_tlb_others(cpumask_t c
* atomic_set_mask(cpumask, &flush_cpumask);
*/
flush_cpumask = cpumask;
+ mb();
/*
* We have to send the IPI only to
* CPUs affected.
@@ -377,7 +379,8 @@ static void flush_tlb_others(cpumask_t c
send_IPI_mask(cpumask, INVALIDATE_TLB_VECTOR);

while (any_online_cpu(flush_cpumask) < NR_CPUS)
- /* nothing. lockup detection does not belong here */;
+ /* nothing. lockup detection does not belong here */
+ mb();

flush_mm = NULL;
flush_va = 0;
diff -urpN cpu-2.5.59-1/include/linux/cpumask.h cpu-2.5.59-2/include/linux/cpumask.h
--- cpu-2.5.59-1/include/linux/cpumask.h 2003-01-19 11:53:27.000000000 -0800
+++ cpu-2.5.59-2/include/linux/cpumask.h 2003-01-19 14:40:49.000000000 -0800
@@ -16,7 +16,7 @@ extern cpumask_t cpu_online_map;

#define cpu_online(cpu) test_bit(cpu, cpu_online_map.mask)
#define num_online_cpus() bitmap_weight(cpu_online_map.mask, NR_CPUS)
-#define any_online_cpu(map) find_first_zero_bit((map).mask, NR_CPUS)
+#define any_online_cpu(map) find_first_bit((map).mask, NR_CPUS)

#define cpu_set(cpu, map) set_bit(cpu, (map).mask)
#define cpu_clear(cpu, map) clear_bit(cpu, (map).mask)
@@ -26,8 +26,8 @@ extern cpumask_t cpu_online_map;
#define cpus_and(dst,src1,src2) bitmap_and((dst).mask,(src1).mask, (src2).mask, NR_CPUS)
#define cpus_or(dst,src1,src2) bitmap_or((dst).mask, (src1).mask, (src2).mask, NR_CPUS)
#define cpus_equal(map1, map2) bitmap_equal((map1).mask, (map2).mask, NR_CPUS)
-#define first_cpu(map) find_first_zero_bit((map).mask, NR_CPUS)
-#define next_cpu(cpu, map) find_next_zero_bit((map).mask, NR_CPUS, cpu)
+#define first_cpu(map) find_first_bit((map).mask, NR_CPUS)
+#define next_cpu(cpu, map) find_next_bit((map).mask, NR_CPUS, cpu)

static inline int next_online_cpu(int cpu, cpumask_t map)
{
-
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