[Xen-changelog] [xen stable-4.12] IRQ: u16 is too narrow for an event channel number

[patchbot@xxxxxxx]

commit 5454111f2824a5d42df9f07801622cf4aff6c69e
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Thu Mar 5 11:13:55 2020 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Mar 5 11:13:55 2020 +0100

    IRQ: u16 is too narrow for an event channel number
    
    FIFO event channels allow ports up to 2^17, so we need to use a wider
    field in struct pirq. Move "masked" such that it may share the 8-byte
    slot with struct arch_pirq on 64-bit arches, rather than leaving a
    7-byte hole in all cases.
    
    Take the opportunity and also add a comment regarding "arch" placement
    within the structure.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    
    Arm: fix build after 892b9dcebdb7
    
    "IRQ: u16 is too narrow for an event channel number" introduced a use of
    evetchn_port_t, but its typedef apparently surfaces indirectly here only
    on x86.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    master commit: 892b9dcebdb7f646657e11cfdd95a385107bbefa
    master date: 2020-01-14 12:03:47 +0100
    master commit: b4194711ffaffa5e63d986338fb8d4020fa6bad1
    master date: 2020-01-14 16:06:27 +0100
---
 xen/include/xen/irq.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/xen/include/xen/irq.h b/xen/include/xen/irq.h
index 586b78393a..ce27524281 100644
--- a/xen/include/xen/irq.h
+++ b/xen/include/xen/irq.h
@@ -8,6 +8,7 @@
 #include <xen/list.h>
 #include <asm/regs.h>
 #include <asm/hardirq.h>
+#include <public/event_channel.h>
 
 struct irqaction {
     void (*handler)(int, void *, struct cpu_user_regs *);
@@ -127,9 +128,10 @@ struct vcpu;
 
 struct pirq {
     int pirq;
-    u16 evtchn;
-    bool_t masked;
+    evtchn_port_t evtchn;
     struct rcu_head rcu_head;
+    bool masked;
+    /* Architectures may require this field to be last. */
     struct arch_pirq arch;
 };
 
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.12

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