linux-kernel - [tip:x86/urgent] x86/irq: Get rid of code duplication

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Message-ID: <tip-ab25ac02148b600e645f77cfb8b8ea415ed75bb4@git.kernel.org>
Date:	Sat, 16 Jan 2016 13:18:32 -0800
From:	tip-bot for Thomas Gleixner <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, joe.lawrence@...atus.com,
	bp@...en8.de, hpa@...or.com, linux@...ck-us.net, mingo@...nel.org,
	jiang.liu@...ux.intel.com, tglx@...utronix.de, jmmahler@...il.com
Subject: [tip:x86/urgent] x86/irq: Get rid of code duplication

Commit-ID:  ab25ac02148b600e645f77cfb8b8ea415ed75bb4
Gitweb:     http://git.kernel.org/tip/ab25ac02148b600e645f77cfb8b8ea415ed75bb4
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Thu, 31 Dec 2015 16:30:49 +0000
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Fri, 15 Jan 2016 13:44:00 +0100

x86/irq: Get rid of code duplication

Reusing an existing vector and assigning a new vector has duplicated
code. Consolidate it.

This is also a preparatory patch for finally plugging the cleanup race.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Tested-by: Borislav Petkov <bp@...en8.de>
Tested-by: Joe Lawrence <joe.lawrence@...atus.com>
Cc: Jiang Liu <jiang.liu@...ux.intel.com>
Cc: Jeremiah Mahler <jmmahler@...il.com>
Cc: andy.shevchenko@...il.com
Cc: Guenter Roeck <linux@...ck-us.net>
Cc: stable@...r.kernel.org #4.3+
Link: http://lkml.kernel.org/r/20151231160106.721599216@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/kernel/apic/vector.c | 33 +++++++++++++++------------------
 1 file changed, 15 insertions(+), 18 deletions(-)

diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
index 1bd29c6..fccfa3f 100644
--- a/arch/x86/kernel/apic/vector.c
+++ b/arch/x86/kernel/apic/vector.c
@@ -118,7 +118,7 @@ static int __assign_irq_vector(int irq, struct apic_chip_data *d,
 	 */
 	static int current_vector = FIRST_EXTERNAL_VECTOR + VECTOR_OFFSET_START;
 	static int current_offset = VECTOR_OFFSET_START % 16;
-	int cpu;
+	int cpu, vector;
 
 	if (d->move_in_progress)
 		return -EBUSY;
@@ -128,7 +128,7 @@ static int __assign_irq_vector(int irq, struct apic_chip_data *d,
 	cpumask_clear(searched_cpumask);
 	cpu = cpumask_first_and(mask, cpu_online_mask);
 	while (cpu < nr_cpu_ids) {
-		int new_cpu, vector, offset;
+		int new_cpu, offset;
 
 		/* Get the possible target cpus for @mask/@cpu from the apic */
 		apic->vector_allocation_domain(cpu, vector_cpumask, mask);
@@ -148,16 +148,12 @@ static int __assign_irq_vector(int irq, struct apic_chip_data *d,
 			if (cpumask_equal(vector_cpumask, d->domain))
 				goto success;
 			/*
-			 * New cpumask using the vector is a proper subset of
-			 * the current in use mask. So cleanup the vector
-			 * allocation for the members that are not used anymore.
+			 * Mark the cpus which are not longer in the mask for
+			 * cleanup.
 			 */
-			cpumask_andnot(d->old_domain, d->domain,
-				       vector_cpumask);
-			d->move_in_progress =
-			   cpumask_intersects(d->old_domain, cpu_online_mask);
-			cpumask_copy(d->domain, vector_cpumask);
-			goto success;
+			cpumask_andnot(d->old_domain, d->domain, vector_cpumask);
+			vector = d->cfg.vector;
+			goto update;
 		}
 
 		vector = current_vector;
@@ -183,16 +179,12 @@ next:
 		/* Found one! */
 		current_vector = vector;
 		current_offset = offset;
-		if (d->cfg.vector) {
+		/* Schedule the old vector for cleanup on all cpus */
+		if (d->cfg.vector)
 			cpumask_copy(d->old_domain, d->domain);
-			d->move_in_progress =
-			   cpumask_intersects(d->old_domain, cpu_online_mask);
-		}
 		for_each_cpu(new_cpu, vector_searchmask)
 			per_cpu(vector_irq, new_cpu)[vector] = irq_to_desc(irq);
-		d->cfg.vector = vector;
-		cpumask_copy(d->domain, vector_cpumask);
-		goto success;
+		goto update;
 
 next_cpu:
 		/*
@@ -209,6 +201,11 @@ next_cpu:
 	}
 	return -ENOSPC;
 
+update:
+	/* Cleanup required ? */
+	d->move_in_progress = cpumask_intersects(d->old_domain, cpu_online_mask);
+	d->cfg.vector = vector;
+	cpumask_copy(d->domain, vector_cpumask);
 success:
 	/*
 	 * Cache destination APIC IDs into cfg->dest_apicid. This cannot fail