linux-kernel - [PATCH] x86-32: NUMA irq stacks allocations

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Message-ID: <1288276854.2649.607.camel@edumazet-laptop>
Date:	Thu, 28 Oct 2010 16:40:54 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>
Cc:	Brian Gerst <brgerst@...il.com>, tj@...nel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org
Subject: [PATCH] x86-32: NUMA irq stacks allocations

commit 22d4cd4c4d (Allocate irq stacks seperate from percpu area)
removed NUMA affinity of IRQ stacks.

Using alloc_pages_node() instead of __get_free_pages() is safe, even if
the target node has no available LOWMEM pages : alloc_pages_node()
fallbacks to another node.

Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
Cc: Brian Gerst <brgerst@...il.com>
Cc: tj@...nel.org
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Peter Zijlstra <peterz@...radead.org>
---
 arch/x86/kernel/irq_32.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/irq_32.c b/arch/x86/kernel/irq_32.c
index 64668db..96656f2 100644
--- a/arch/x86/kernel/irq_32.c
+++ b/arch/x86/kernel/irq_32.c
@@ -17,6 +17,7 @@
 #include <linux/delay.h>
 #include <linux/uaccess.h>
 #include <linux/percpu.h>
+#include <linux/mm.h>
 
 #include <asm/apic.h>
 
@@ -125,7 +126,9 @@ void __cpuinit irq_ctx_init(int cpu)
 	if (per_cpu(hardirq_ctx, cpu))
 		return;
 
-	irqctx = (union irq_ctx *)__get_free_pages(THREAD_FLAGS, THREAD_ORDER);
+	irqctx = page_address(alloc_pages_node(cpu_to_node(cpu),
+					       THREAD_FLAGS,
+					       THREAD_ORDER));
 	irqctx->tinfo.task		= NULL;
 	irqctx->tinfo.exec_domain	= NULL;
 	irqctx->tinfo.cpu		= cpu;
@@ -134,7 +137,9 @@ void __cpuinit irq_ctx_init(int cpu)
 
 	per_cpu(hardirq_ctx, cpu) = irqctx;
 
-	irqctx = (union irq_ctx *)__get_free_pages(THREAD_FLAGS, THREAD_ORDER);
+	irqctx = page_address(alloc_pages_node(cpu_to_node(cpu),
+					       THREAD_FLAGS,
+					       THREAD_ORDER));
 	irqctx->tinfo.task		= NULL;
 	irqctx->tinfo.exec_domain	= NULL;
 	irqctx->tinfo.cpu		= cpu;


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