linux-kernel - [PATCH v4 2/2] x86/apic: Replace common tools with new ones

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Message-ID: <20180226023957.22861-2-douly.fnst@cn.fujitsu.com>
Date:   Mon, 26 Feb 2018 10:39:57 +0800
From:   Dou Liyang <douly.fnst@...fujitsu.com>
To:     <linux-kernel@...r.kernel.org>, <x86@...nel.org>
CC:     <tglx@...utronix.de>, <mingo@...nel.org>, <ebiederm@...ssion.com>,
        <bhe@...hat.com>, <andy.shevchenko@...il.com>,
        Dou Liyang <douly.fnst@...fujitsu.com>
Subject: [PATCH v4 2/2] x86/apic: Replace common tools with new ones

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

Signed-off-by: Dou Liyang <douly.fnst@...fujitsu.com>
---
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