linux-kernel - [tip: x86/irq] x86/idt: Remove address argument from idt

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Date:   Tue, 25 May 2021 09:29:16 -0000
From:   "tip-bot2 for H. Peter Anvin (Intel)" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     "H. Peter Anvin (Intel)" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/irq] x86/idt: Remove address argument from idt_invalidate()

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

Commit-ID:     8ec9069a432c873e52e6f4ce1496f282a4299604
Gitweb:        https://git.kernel.org/tip/8ec9069a432c873e52e6f4ce1496f282a4299604
Author:        H. Peter Anvin (Intel) <hpa@...or.com>
AuthorDate:    Wed, 19 May 2021 14:21:50 -07:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Fri, 21 May 2021 12:36:45 +02:00

x86/idt: Remove address argument from idt_invalidate()

There is no reason to specify any specific address to idt_invalidate(). It
looks mostly like an artifact of unifying code done differently by
accident. The most "sensible" address to set here is a NULL pointer -
virtual address zero, just as a visual marker.

This also makes it possible to mark the struct desc_ptr in idt_invalidate()
as static const.

Signed-off-by: H. Peter Anvin (Intel) <hpa@...or.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Link: https://lore.kernel.org/r/20210519212154.511983-5-hpa@zytor.com

---
 arch/x86/include/asm/desc.h        | 2 +-
 arch/x86/kernel/idt.c              | 5 ++---
 arch/x86/kernel/machine_kexec_32.c | 2 +-
 arch/x86/kernel/reboot.c           | 2 +-
 4 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/arch/x86/include/asm/desc.h b/arch/x86/include/asm/desc.h
index 476082a..b8429ae 100644
--- a/arch/x86/include/asm/desc.h
+++ b/arch/x86/include/asm/desc.h
@@ -427,6 +427,6 @@ static inline void idt_setup_early_pf(void) { }
 static inline void idt_setup_ist_traps(void) { }
 #endif
 
-extern void idt_invalidate(void *addr);
+extern void idt_invalidate(void);
 
 #endif /* _ASM_X86_DESC_H */
diff --git a/arch/x86/kernel/idt.c b/arch/x86/kernel/idt.c
index d552f17..2779f52 100644
--- a/arch/x86/kernel/idt.c
+++ b/arch/x86/kernel/idt.c
@@ -331,11 +331,10 @@ void __init idt_setup_early_handler(void)
 
 /**
  * idt_invalidate - Invalidate interrupt descriptor table
- * @addr:	The virtual address of the 'invalid' IDT
  */
-void idt_invalidate(void *addr)
+void idt_invalidate(void)
 {
-	struct desc_ptr idt = { .address = (unsigned long) addr, .size = 0 };
+	static const struct desc_ptr idt = { .address = 0, .size = 0 };
 
 	load_idt(&idt);
 }
diff --git a/arch/x86/kernel/machine_kexec_32.c b/arch/x86/kernel/machine_kexec_32.c
index 64b00b0..1e34fee 100644
--- a/arch/x86/kernel/machine_kexec_32.c
+++ b/arch/x86/kernel/machine_kexec_32.c
@@ -232,7 +232,7 @@ void machine_kexec(struct kimage *image)
 	 * The gdt & idt are now invalid.
 	 * If you want to load them you must set up your own idt & gdt.
 	 */
-	idt_invalidate(phys_to_virt(0));
+	idt_invalidate();
 	set_gdt(phys_to_virt(0), 0);
 
 	/* now call it */
diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index b29657b..ebfb911 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -669,7 +669,7 @@ static void native_machine_emergency_restart(void)
 			break;
 
 		case BOOT_TRIPLE:
-			idt_invalidate(NULL);
+			idt_invalidate();
 			__asm__ __volatile__("int3");
 
 			/* We're probably dead after this, but... */