[Xen-changelog] [linux-2.6.18-xen] Make last processed event channel a per-cpu variable.

["Xen patchbot-linux-2.6.18-xen" <patchbot-linux-2.6.18-xen@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Ian Campbell <ian.campbell@xxxxxxxxxx>
# Date 1196671812 0
# Node ID b2768401db943e66af9d64bd610ffa225f560c0b
# Parent  7fe1c6d02a2bd8d38b6a8b529f166990e4cd1dc3
Make last processed event channel a per-cpu variable.

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxxxxx>
---
 drivers/xen/core/evtchn.c |   11 ++++++-----
 1 files changed, 6 insertions(+), 5 deletions(-)

diff -r 7fe1c6d02a2b -r b2768401db94 drivers/xen/core/evtchn.c
--- a/drivers/xen/core/evtchn.c Fri Nov 30 14:35:31 2007 +0000
+++ b/drivers/xen/core/evtchn.c Mon Dec 03 08:50:12 2007 +0000
@@ -221,6 +221,8 @@ EXPORT_SYMBOL(force_evtchn_callback);
 EXPORT_SYMBOL(force_evtchn_callback);
 
 static DEFINE_PER_CPU(unsigned int, upcall_count) = { 0 };
+static DEFINE_PER_CPU(unsigned int, last_processed_l1i) = { BITS_PER_LONG - 1 
};
+static DEFINE_PER_CPU(unsigned int, last_processed_l2i) = { BITS_PER_LONG - 1 
};
 
 /* NB. Interrupts are disabled on entry. */
 asmlinkage void evtchn_do_upcall(struct pt_regs *regs)
@@ -228,7 +230,6 @@ asmlinkage void evtchn_do_upcall(struct 
        unsigned long       l1, l2;
        unsigned long       masked_l1, masked_l2;
        unsigned int        l1i, l2i, port, count;
-       static unsigned int last_processed_l1i = BITS_PER_LONG - 1, 
last_processed_l2i = BITS_PER_LONG - 1;
        int                 irq, cpu = smp_processor_id();
        shared_info_t      *s = HYPERVISOR_shared_info;
        vcpu_info_t        *vcpu_info = &s->vcpu_info[cpu];
@@ -248,8 +249,8 @@ asmlinkage void evtchn_do_upcall(struct 
 #endif
                l1 = xchg(&vcpu_info->evtchn_pending_sel, 0);
 
-               l1i = last_processed_l1i;
-               l2i = last_processed_l2i;
+               l1i = per_cpu(last_processed_l1i, cpu);
+               l2i = per_cpu(last_processed_l2i, cpu);
 
                while (l1 != 0) {
 
@@ -286,8 +287,8 @@ asmlinkage void evtchn_do_upcall(struct 
                                }
 
                                /* if this is the final port processed, we'll 
pick up here+1 next time */
-                               last_processed_l1i = l1i;
-                               last_processed_l2i = l2i;
+                               per_cpu(last_processed_l1i, cpu) = l1i;
+                               per_cpu(last_processed_l2i, cpu) = l2i;
 
                        } while (l2i != BITS_PER_LONG - 1);
 

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