[tip:x86/urgent] x86: irq: Get correct available vectors for cpu disable

From: tip-bot for Yinghai Lu
Date: Wed Jun 04 2014 - 08:23:17 EST


Commit-ID: ac2a55395eddccd6e3e39532df9869d61e97b2ee
Gitweb: http://git.kernel.org/tip/ac2a55395eddccd6e3e39532df9869d61e97b2ee
Author: Yinghai Lu <yinghai@xxxxxxxxxx>
AuthorDate: Tue, 13 May 2014 11:39:34 -0400
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Wed, 4 Jun 2014 14:18:34 +0200

x86: irq: Get correct available vectors for cpu disable

check_irq_vectors_for_cpu_disable() can overestimate the number of
available interrupt vectors, so the check for cpu down succeeds, but
the actual cpu removal fails.

It iterates from FIRST_EXTERNAL_VECTOR to NR_VECTORS, which is wrong
because the systems vectors are not taken into account.

Limit the search to first_system_vector instead of NR_VECTORS.

The second indicator for vector availability the used_vectors bitmap
is not taken into account at all. So system vectors,
e.g. IA32_SYSCALL_VECTOR (0x80) and IRQ_MOVE_CLEANUP_VECTOR (0x20),
are accounted as available.

Add a check for the used_vectors bitmap and do not account vectors
which are marked there.

[ tglx: Simplified code. Rewrote changelog and code comments. ]

Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
Acked-by: Prarit Bhargava <prarit@xxxxxxxxxx>
Cc: Seiji Aguchi <seiji.aguchi@xxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
Cc: Steven Rostedt (Red Hat) <rostedt@xxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: "Elliott, Robert (Server Storage)" <Elliott@xxxxxx>
Cc: x86@xxxxxxxxxx
Link: http://lkml.kernel.org/r/1400160305-17774-2-git-send-email-prarit@xxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
arch/x86/kernel/irq.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index 283a76a..11ccfb0 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -17,6 +17,7 @@
#include <asm/idle.h>
#include <asm/mce.h>
#include <asm/hw_irq.h>
+#include <asm/desc.h>

#define CREATE_TRACE_POINTS
#include <asm/trace/irq_vectors.h>
@@ -334,10 +335,17 @@ int check_irq_vectors_for_cpu_disable(void)
for_each_online_cpu(cpu) {
if (cpu == this_cpu)
continue;
- for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS;
- vector++) {
- if (per_cpu(vector_irq, cpu)[vector] < 0)
- count++;
+ /*
+ * We scan from FIRST_EXTERNAL_VECTOR to first system
+ * vector. If the vector is marked in the used vectors
+ * bitmap or an irq is assigned to it, we don't count
+ * it as available.
+ */
+ for (vector = FIRST_EXTERNAL_VECTOR;
+ vector < first_system_vector; vector++) {
+ if (!test_bit(vector, used_vectors) &&
+ per_cpu(vector_irq, cpu)[vector] < 0)
+ count++;
}
}

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