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Subject[tip:irq/core] irq/Documentation: Correct result of echnoing 5 to smp_affinity
Commit-ID:  99e9d958726c04cec3e36902d8583fdd8cb5b1bb
Gitweb: http://git.kernel.org/tip/99e9d958726c04cec3e36902d8583fdd8cb5b1bb
Author: John Kacur <jkacur@redhat.com>
AuthorDate: Fri, 17 Jun 2016 15:05:15 +0200
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Sun, 10 Jul 2016 16:55:04 +0200

irq/Documentation: Correct result of echnoing 5 to smp_affinity

This command:

echo 5 > /proc/irq/10/smp_affinity

means only the first and third (not fourth) CPUs can handle irqs
That is, CPU0 is the first CPU and CPU2 is the third cpu

Signed-off-by: John Kacur <jkacur@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1466168715-8410-1-git-send-email-jkacur@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
Documentation/filesystems/proc.txt | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
index e8d0075..5b61eea 100644
--- a/Documentation/filesystems/proc.txt
+++ b/Documentation/filesystems/proc.txt
@@ -725,7 +725,7 @@ IRQ, you can set it by doing:
> echo 1 > /proc/irq/10/smp_affinity

This means that only the first CPU will handle the IRQ, but you can also echo
-5 which means that only the first and fourth CPU can handle the IRQ.
+5 which means that only the first and third CPU can handle the IRQ.

The contents of each smp_affinity file is the same by default:

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