[Xen-changelog] [xen master] xen arm/arm64: minor improvement in smp_send_call_function_mask()

[patchbot@xxxxxxx]

commit 95f7ed9abb71b897c70893aaa9c4f413aa4b487e
Author:     Anup Patel <anup.patel@xxxxxxxxxx>
AuthorDate: Mon Aug 25 15:48:40 2014 +0530
Commit:     Ian Campbell <ian.campbell@xxxxxxxxxx>
CommitDate: Tue Aug 26 21:31:29 2014 +0100

    xen arm/arm64: minor improvement in smp_send_call_function_mask()
    
    Currently, smp_send_call_function_mask() function implemented
    by xen arm/arm64 will use IPI to call function on current CPU.
    
    This means that current smp_send_call_function_mask() will do
    the following on current CPU:
    Trigger SGI for current CPU => Xen takes interrupt on current CPU
    => IPI interrupt handler will call smp_call_function_interrupt()
    
    This patch improves the above by straight away calling
    smp_call_function_interrupt() for current CPU. This is very
    similar to smp_send_call_function_mask() implemented by Xen x86.
    
    Signed-off-by: Anup Patel <anup.patel@xxxxxxxxxx>
    Signed-off-by: Pranavkumar Sawargaonkar <pranavkumar@xxxxxxxxxx>
    Acked-by: Julien Grall <julien.grall@xxxxxxxxxx>
    Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 xen/arch/arm/smp.c |   13 ++++++++++++-
 1 files changed, 12 insertions(+), 1 deletions(-)

diff --git a/xen/arch/arm/smp.c b/xen/arch/arm/smp.c
index 30203b8..917d490 100644
--- a/xen/arch/arm/smp.c
+++ b/xen/arch/arm/smp.c
@@ -19,7 +19,18 @@ void smp_send_event_check_mask(const cpumask_t *mask)
 
 void smp_send_call_function_mask(const cpumask_t *mask)
 {
-    send_SGI_mask(mask, GIC_SGI_CALL_FUNCTION);
+    cpumask_t target_mask;
+
+    cpumask_andnot(&target_mask, mask, cpumask_of(smp_processor_id()));
+
+    send_SGI_mask(&target_mask, GIC_SGI_CALL_FUNCTION);
+
+    if ( cpumask_test_cpu(smp_processor_id(), mask) )
+    {
+        local_irq_disable();
+        smp_call_function_interrupt();
+        local_irq_enable();
+    }
 }
 
 /*
--
generated by git-patchbot for /home/xen/git/xen.git#master

_______________________________________________
Xen-changelog mailing list
Xen-changelog@xxxxxxxxxxxxx
http://lists.xensource.com/xen-changelog