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x86/apic: Modernize the pending interrupt code 

The pending interrupt check code is old, update the following:

  - Use for_each_set_bit() instead of open coding it
  - Replace printk() with pr_err()
  - Get rid of printk line breaks
  - Make curly braces balanced

Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Dou Liyang <douly.fnst@cn.fujitsu.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: bhe@redhat.com
Cc: ebiederm@xmission.com
Link: https://lkml.kernel.org/r/20180301055930.2396-3-douly.fnst@cn.fujitsu.com
This commit is contained in:
Dou Liyang 2018-03-01 13:59:29 +08:00 committed by Thomas Gleixner
parent 9b217f3301
commit 3ea9e7ae1a
1 changed files with 8 additions and 9 deletions
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17
arch/x86/kernel/apic/apic.c
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@ -1412,7 +1412,8 @@ static void apic_pending_intr_clear(void)
{ {
long long max_loops = cpu_khz ? cpu_khz : 1000000; long long max_loops = cpu_khz ? cpu_khz : 1000000;
unsigned long long tsc = 0, ntsc; unsigned long long tsc = 0, ntsc;
unsigned int value, queued; unsigned int queued;
unsigned long value;
int i, j, acked = 0; int i, j, acked = 0;
if (boot_cpu_has(X86_FEATURE_TSC)) if (boot_cpu_has(X86_FEATURE_TSC))
@ -1435,24 +1436,22 @@ static void apic_pending_intr_clear(void)
for (i = APIC_ISR_NR - 1; i >= 0; i--) { for (i = APIC_ISR_NR - 1; i >= 0; i--) {
value = apic_read(APIC_ISR + i*0x10); value = apic_read(APIC_ISR + i*0x10);
for (j = 31; j >= 0; j--) { for_each_set_bit(j, &value, 32) {
if (value & (1<<j)) { ack_APIC_irq();
ack_APIC_irq(); acked++;
acked++;
}
} }
} }
if (acked > 256) { if (acked > 256) {
printk(KERN_ERR "LAPIC pending interrupts after %d EOI\n", pr_err("LAPIC pending interrupts after %d EOI\n", acked);
acked);
break; break;
} }
if (queued) { if (queued) {
if (boot_cpu_has(X86_FEATURE_TSC) && cpu_khz) { if (boot_cpu_has(X86_FEATURE_TSC) && cpu_khz) {
ntsc = rdtsc(); ntsc = rdtsc();
max_loops = (cpu_khz << 10) - (ntsc - tsc); max_loops = (cpu_khz << 10) - (ntsc - tsc);
} else } else {
max_loops--; max_loops--;
}
} }
} while (queued && max_loops > 0); } while (queued && max_loops > 0);
WARN_ON(max_loops <= 0); WARN_ON(max_loops <= 0);