linux-kernel - [PATCH 1/1] irq/matrix: Fix memory overallocation

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Message-ID: <1541032428-10392-1-git-send-email-mikelley@microsoft.com>
Date:   Thu, 1 Nov 2018 00:35:05 +0000
From:   Michael Kelley <mikelley@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>
CC:     Michael Kelley <mikelley@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>
Subject: [PATCH 1/1] irq/matrix: Fix memory overallocation

IRQ_MATRIX_SIZE is the number of longs needed for a bitmap,
multiplied by the size of a long, yielding a byte count. But
it is used as the size of an array of longs, which is way more
memory than is needed.  Change IRQ_MATRIX_SIZE so it is just the
number of longs needed and the arrays come out the correct size.

Signed-off-by: Michael Kelley <mikelley@...rosoft.com>
---
 kernel/irq/matrix.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/irq/matrix.c b/kernel/irq/matrix.c
index 6e6d467..1f0985a 100644
--- a/kernel/irq/matrix.c
+++ b/kernel/irq/matrix.c
@@ -8,7 +8,7 @@
 #include <linux/cpu.h>
 #include <linux/irq.h>
 
-#define IRQ_MATRIX_SIZE	(BITS_TO_LONGS(IRQ_MATRIX_BITS) * sizeof(unsigned long))
+#define IRQ_MATRIX_SIZE	(BITS_TO_LONGS(IRQ_MATRIX_BITS))
 
 struct cpumap {
 	unsigned int		available;
-- 
1.8.3.1