linux-kernel - [PATCH v3 02/12] x86/irq: Unionize PID.PIR for 64bit access w/o casting

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Message-Id: <20240423174114.526704-3-jacob.jun.pan@linux.intel.com>
Date: Tue, 23 Apr 2024 10:41:04 -0700
From: Jacob Pan <jacob.jun.pan@...ux.intel.com>
To: LKML <linux-kernel@...r.kernel.org>,
	X86 Kernel <x86@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	iommu@...ts.linux.dev,
	Thomas Gleixner <tglx@...utronix.de>,
	"Lu Baolu" <baolu.lu@...ux.intel.com>,
	kvm@...r.kernel.org,
	Dave Hansen <dave.hansen@...el.com>,
	Joerg Roedel <joro@...tes.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Borislav Petkov" <bp@...en8.de>,
	"Ingo Molnar" <mingo@...hat.com>
Cc: Paul Luse <paul.e.luse@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Jens Axboe <axboe@...nel.dk>,
	Raj Ashok <ashok.raj@...el.com>,
	"Tian, Kevin" <kevin.tian@...el.com>,
	maz@...nel.org,
	seanjc@...gle.com,
	"Robin Murphy" <robin.murphy@....com>,
	jim.harris@...sung.com,
	a.manzanares@...sung.com,
	"Bjorn Helgaas" <helgaas@...nel.org>,
	guang.zeng@...el.com,
	robert.hoo.linux@...il.com,
	oliver.sang@...el.com,
	acme@...nel.org,
	Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH v3  02/12] x86/irq: Unionize PID.PIR for 64bit access w/o casting

Make 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>
---
 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 f0324c56f7af..acf237b2882e 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 */
-- 
2.25.1