linux-kernel - [tip: x86/irq] x86/irq: Unionize PID.PIR for 64bit access w/o casting

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Date: Tue, 30 Apr 2024 13:28:42 -0000
From: "tip-bot2 for Jacob Pan" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>,
 Jacob Pan <jacob.jun.pan@...ux.intel.com>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: x86/irq] x86/irq: Unionize PID.PIR for 64bit access w/o casting

The following commit has been merged into the x86/irq branch of tip:

Commit-ID:     4ec8fd037139a4d8afb2a5c7edb4a17f9449a035
Gitweb:        https://git.kernel.org/tip/4ec8fd037139a4d8afb2a5c7edb4a17f9449a035
Author:        Jacob Pan <jacob.jun.pan@...ux.intel.com>
AuthorDate:    Tue, 23 Apr 2024 10:41:04 -07:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Tue, 30 Apr 2024 00:54:42 +02:00

x86/irq: Unionize PID.PIR for 64bit access w/o casting

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

Suggested-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Link: https://lore.kernel.org/r/20240423174114.526704-3-jacob.jun.pan@linux.intel.com

---
 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 f0324c5..acf237b 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 pir64[4];
+	};
 	union {
 		struct {
 				/* bit 256 - Outstanding Notification */