[PATCH RFC 06/13] x86/irq: Unionize PID.PIR for 64bit access w/o casting

[Jacob Pan]

Make PIR field into u64 such that atomic xchg64 can be used without ugly
casting.

Suggested-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx>
---
 arch/x86/include/asm/posted_intr.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/posted_intr.h b/arch/x86/include/asm/posted_intr.h
index 2cd9ac1af835..3af00f5395e4 100644
--- a/arch/x86/include/asm/posted_intr.h
+++ b/arch/x86/include/asm/posted_intr.h
@@ -9,7 +9,10 @@
 
 /* Posted-Interrupt Descriptor */
 struct pi_desc {
-	u32 pir[8];     /* Posted interrupt requested */
+	union {
+		u32 pir[8];     /* Posted interrupt requested */
+		u64 pir_l[4];
+	};
 	union {
 		struct {
 				/* bit 256 - Outstanding Notification */
-- 
2.25.1