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irq/matrix: Fix memory overallocation

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[ Upstream commit 57f01796f14fecf00d330fe39c8d2477ced9cd79 ]

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 to size 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.

Fixes: 2f75d9e1c9 ("genirq: Implement bitmap matrix allocator")
Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: KY Srinivasan <kys@microsoft.com>
Link: https://lkml.kernel.org/r/1541032428-10392-1-git-send-email-mikelley@microsoft.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Michael Kelley 2018-11-01 00:35:05 +00:00 committed by Greg Kroah-Hartman
parent ad8298fccd
commit 0bbb8382db
1 changed files with 1 additions and 1 deletions
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2
kernel/irq/matrix.c
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@ -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;