linux-kernel - [tip:x86/urgent] x86/apic: Simplify enable_IR_x2apic(), remove try_to_enable

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Date:   Wed, 1 Mar 2017 01:14:45 -0800
From:   tip-bot for Dou Liyang <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     douly.fnst@...fujitsu.com, torvalds@...ux-foundation.org,
        linux-kernel@...r.kernel.org, peterz@...radead.org,
        tglx@...utronix.de, mingo@...nel.org, hpa@...or.com
Subject: [tip:x86/urgent] x86/apic: Simplify enable_IR_x2apic(), remove
 try_to_enable_IR()

Commit-ID:  11277aabcbbe13916151af897d29a5e9f71ca73f
Gitweb:     http://git.kernel.org/tip/11277aabcbbe13916151af897d29a5e9f71ca73f
Author:     Dou Liyang <douly.fnst@...fujitsu.com>
AuthorDate: Thu, 23 Feb 2017 17:16:41 +0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 1 Mar 2017 10:09:09 +0100

x86/apic: Simplify enable_IR_x2apic(), remove try_to_enable_IR()

The following commit:

  2e63ad4bd5dd ("x86/apic: Do not init irq remapping if ioapic is disabled")

... added a check for skipped IO-APIC setup to enable_IR_x2apic(), but this
check is also duplicated in try_to_enable_IR() - and it will never succeed in
calling irq_remapping_enable().

Remove the whole irq_remapping_enable() complication: if the IO-APIC is
disabled we cannot enable IRQ remapping.

Signed-off-by: Dou Liyang <douly.fnst@...fujitsu.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: bp@...en8.de
Cc: nicstange@...il.com
Cc: wanpeng.li@...mail.com
Link: http://lkml.kernel.org/r/1487841401-1543-1-git-send-email-douly.fnst@cn.fujitsu.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/apic/apic.c | 17 ++++-------------
 1 file changed, 4 insertions(+), 13 deletions(-)

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 11088b8..aee7ded 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -1610,24 +1610,15 @@ static inline void try_to_enable_x2apic(int remap_mode) { }
 static inline void __x2apic_enable(void) { }
 #endif /* !CONFIG_X86_X2APIC */
 
-static int __init try_to_enable_IR(void)
-{
-#ifdef CONFIG_X86_IO_APIC
-	if (!x2apic_enabled() && skip_ioapic_setup) {
-		pr_info("Not enabling interrupt remapping due to skipped IO-APIC setup\n");
-		return -1;
-	}
-#endif
-	return irq_remapping_enable();
-}
-
 void __init enable_IR_x2apic(void)
 {
 	unsigned long flags;
 	int ret, ir_stat;
 
-	if (skip_ioapic_setup)
+	if (skip_ioapic_setup) {
+		pr_info("Not enabling interrupt remapping due to skipped IO-APIC setup\n");
 		return;
+	}
 
 	ir_stat = irq_remapping_prepare();
 	if (ir_stat < 0 && !x2apic_supported())
@@ -1645,7 +1636,7 @@ void __init enable_IR_x2apic(void)
 
 	/* If irq_remapping_prepare() succeeded, try to enable it */
 	if (ir_stat >= 0)
-		ir_stat = try_to_enable_IR();
+		ir_stat = irq_remapping_enable();
 	/* ir_stat contains the remap mode or an error code */
 	try_to_enable_x2apic(ir_stat);