Re: [PATCH v4 2/2] x86/apic: Replace common tools with new ones

From: Andy Shevchenko
Date: Mon Feb 26 2018 - 06:50:15 EST


On Mon, Feb 26, 2018 at 4:39 AM, Dou Liyang <douly.fnst@xxxxxxxxxxxxxx> wrote:
> The pending interrupt check code is old, update the following.
>
> -Replace for-if pair with for_each_set_bit()
> -Replace printk() with pr_err()
>
> Also merge the printk's code in one line and make curly braces balanced
>

Suggested-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>

> Signed-off-by: Dou Liyang <douly.fnst@xxxxxxxxxxxxxx>
> ---
> changlog:
> v3 --> v4:
> -Fix the wrong check for bit 0 suggested by Andy
>
> arch/x86/kernel/apic/apic.c | 17 ++++++++---------
> 1 file changed, 8 insertions(+), 9 deletions(-)
>
> diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
> index be223ebd1bb3..81db2aab257b 100644
> --- a/arch/x86/kernel/apic/apic.c
> +++ b/arch/x86/kernel/apic/apic.c
> @@ -1412,7 +1412,8 @@ static void apic_pending_intr_clear(void)
> {
> long long max_loops = cpu_khz ? cpu_khz : 1000000;
> unsigned long long tsc = 0, ntsc;
> - unsigned int value, queued;
> + unsigned int queued;
> + unsigned long value;
> int i, j, acked = 0;
>
> 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--) {
> value = apic_read(APIC_ISR + i*0x10);
> - for (j = 31; j >= 0; j--) {
> - if (value & (1<<j)) {
> - ack_APIC_irq();
> - acked++;
> - }
> + for_each_set_bit(j, &value, 32) {
> + ack_APIC_irq();
> + acked++;
> }
> }
> if (acked > 256) {
> - printk(KERN_ERR "LAPIC pending interrupts after %d EOI\n",
> - acked);
> + pr_err("LAPIC pending interrupts after %d EOI\n", acked);
> break;
> }
> if (queued) {
> if (boot_cpu_has(X86_FEATURE_TSC) && cpu_khz) {
> ntsc = rdtsc();
> max_loops = (cpu_khz << 10) - (ntsc - tsc);
> - } else
> + } else {
> max_loops--;
> + }
> }
> } while (queued && max_loops > 0);
> WARN_ON(max_loops <= 0);
> --
> 2.14.3
>
>
>



--
With Best Regards,
Andy Shevchenko