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SubjectRe: [PATCH] cpumask_t
On Sun, Jan 19, 2003 at 02:54:58PM -0800, William Lee Irwin III wrote:
> Thanks for spotting this, kai

Zwane spotted this one, do_irq_balance() is clearing a cpumask but used
the wrong bitmap size. This extends the API for extra safety with a
cpus_clear() and avoids the need to be aware of the size (NR_CPUS) of
cpumasks in calling code.

I might need a machine to test this on and/or testers eventually.


-- wli

Introduce cpus_clear() and convert open-coded bitmap_clear(., NR_CPUS)
to use it instead.

arch/i386/kernel/apic.c | 2 +-
arch/i386/kernel/io_apic.c | 8 ++++----
arch/i386/kernel/smpboot.c | 6 +++---
include/linux/cpumask.h | 1 +
kernel/fork.c | 2 +-
5 files changed, 10 insertions(+), 9 deletions(-)

diff -urpN cpu-2.5.59-3/arch/i386/kernel/apic.c cpu-2.5.59-4/arch/i386/kernel/apic.c
--- cpu-2.5.59-3/arch/i386/kernel/apic.c 2003-01-19 12:45:40.000000000 -0800
+++ cpu-2.5.59-4/arch/i386/kernel/apic.c 2003-02-09 23:01:02.000000000 -0800
@@ -1138,7 +1138,7 @@ int __init APIC_init_uniprocessor (void)

connect_bsp_APIC();

- bitmap_clear(phys_cpu_present_map.mask, NR_CPUS);
+ cpus_clear(phys_cpu_present_map);
cpu_set(0, phys_cpu_present_map);
apic_write_around(APIC_ID, boot_cpu_physical_apicid);

diff -urpN cpu-2.5.59-3/arch/i386/kernel/io_apic.c cpu-2.5.59-4/arch/i386/kernel/io_apic.c
--- cpu-2.5.59-3/arch/i386/kernel/io_apic.c 2003-01-19 13:01:29.000000000 -0800
+++ cpu-2.5.59-4/arch/i386/kernel/io_apic.c 2003-02-09 22:59:57.000000000 -0800
@@ -441,7 +441,7 @@ tryanotherirq:
min_loaded = cpu_sibling_map[min_loaded];

cpus_and(allowed_mask, cpu_online_map, irq_affinity[selected_irq]);
- bitmap_clear(target_cpu_mask.mask, BITS_PER_LONG);
+ cpus_clear(target_cpu_mask);
cpu_set(min_loaded, target_cpu_mask);
cpus_and(tmp, target_cpu_mask, allowed_mask);

@@ -509,7 +509,7 @@ static inline void balance_irq (int cpu,
if (cpu != new_cpu) {
irq_desc_t *desc = irq_desc + irq;
spin_lock(&desc->lock);
- bitmap_clear(irq_balance_mask[irq].mask, NR_CPUS);
+ cpus_clear(irq_balance_mask[irq]);
cpu_set(new_cpu, irq_balance_mask[irq]);
spin_unlock(&desc->lock);
}
@@ -526,7 +526,7 @@ int balanced_irq(void *unused)

/* push everything to CPU 0 to give us a starting point. */
for (i = 0 ; i < NR_IRQS ; i++) {
- bitmap_clear(irq_balance_mask[i].mask, NR_CPUS);
+ cpus_clear(irq_balance_mask[i]);
cpu_set(0, irq_balance_mask[i]);
}
for (;;) {
@@ -598,7 +598,7 @@ static inline void move_irq(int irq)
/* note - we hold the desc->lock */
if (unlikely(any_online_cpu(irq_balance_mask[irq]) < NR_CPUS)) {
set_ioapic_affinity(irq, irq_balance_mask[irq]);
- bitmap_clear(irq_balance_mask[irq].mask, NR_CPUS);
+ cpus_clear(irq_balance_mask[irq]);
}
}

diff -urpN cpu-2.5.59-3/arch/i386/kernel/smpboot.c cpu-2.5.59-4/arch/i386/kernel/smpboot.c
--- cpu-2.5.59-3/arch/i386/kernel/smpboot.c 2003-01-19 13:07:06.000000000 -0800
+++ cpu-2.5.59-4/arch/i386/kernel/smpboot.c 2003-02-09 23:00:32.000000000 -0800
@@ -979,7 +979,7 @@ static void __init smp_boot_cpus(unsigne
if (!smp_found_config) {
printk(KERN_NOTICE "SMP motherboard not detected.\n");
smpboot_clear_io_apic_irqs();
- bitmap_clear(phys_cpu_present_map.mask, NR_CPUS);
+ cpus_clear(phys_cpu_present_map);
cpu_set(1, phys_cpu_present_map);
if (APIC_init_uniprocessor())
printk(KERN_NOTICE "Local APIC not detected."
@@ -1006,7 +1006,7 @@ static void __init smp_boot_cpus(unsigne
boot_cpu_physical_apicid);
printk(KERN_ERR "... forcing use of dummy APIC emulation. (tell your hw vendor)\n");
smpboot_clear_io_apic_irqs();
- bitmap_clear(phys_cpu_present_map.mask, NR_CPUS);
+ cpus_clear(phys_cpu_present_map);
cpu_set(1, phys_cpu_present_map);
return;
}
@@ -1020,7 +1020,7 @@ static void __init smp_boot_cpus(unsigne
smp_found_config = 0;
printk(KERN_INFO "SMP mode deactivated, forcing use of dummy APIC emulation.\n");
smpboot_clear_io_apic_irqs();
- bitmap_clear(phys_cpu_present_map.mask, NR_CPUS);
+ cpus_clear(phys_cpu_present_map);
return;
}

diff -urpN cpu-2.5.59-3/include/linux/cpumask.h cpu-2.5.59-4/include/linux/cpumask.h
--- cpu-2.5.59-3/include/linux/cpumask.h 2003-01-19 14:40:49.000000000 -0800
+++ cpu-2.5.59-4/include/linux/cpumask.h 2003-02-09 22:58:35.000000000 -0800
@@ -25,6 +25,7 @@ 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_clear(map) bitmap_clear((map).mask, NR_CPUS)
#define cpus_equal(map1, map2) bitmap_equal((map1).mask, (map2).mask, NR_CPUS)
#define first_cpu(map) find_first_bit((map).mask, NR_CPUS)
#define next_cpu(cpu, map) find_next_bit((map).mask, NR_CPUS, cpu)
diff -urpN cpu-2.5.59-3/kernel/fork.c cpu-2.5.59-4/kernel/fork.c
--- cpu-2.5.59-3/kernel/fork.c 2003-01-19 12:30:54.000000000 -0800
+++ cpu-2.5.59-4/kernel/fork.c 2003-02-09 23:01:23.000000000 -0800
@@ -235,7 +235,7 @@ static inline int dup_mmap(struct mm_str
mm->free_area_cache = TASK_UNMAPPED_BASE;
mm->map_count = 0;
mm->rss = 0;
- bitmap_clear(mm->cpu_vm_mask.mask, NR_CPUS);
+ cpus_clear(mm->cpu_vm_mask);
pprev = &mm->mmap;

/*
-
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