[tip: x86/entry] x86/idt: Use proper constants for table size

["tip-bot2 for Thomas Gleixner" <tip-bot2@linutronix.de>]

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

Commit-ID:     ab46346736ed50ed90f4bfb854f4bec61fecee9e
Gitweb:        https://git.kernel.org/tip/ab46346736ed50ed90f4bfb854f4bec61fecee9e
Author:        Thomas Gleixner <tglx@linutronix.de>
AuthorDate:    Thu, 28 May 2020 16:53:18 +02:00
Committer:     Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Sat, 30 May 2020 11:50:12 +02:00

x86/idt: Use proper constants for table size

Use the actual struct size to calculate the IDT table size instead of
hardcoded values.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200528145522.898591501@linutronix.de

---
 arch/x86/kernel/idt.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/idt.c b/arch/x86/kernel/idt.c
index 5ef82fc..b6e1a87 100644
--- a/arch/x86/kernel/idt.c
+++ b/arch/x86/kernel/idt.c
@@ -51,6 +51,7 @@ struct idt_data {
 #define TSKG(_vector, _gdt)				\
 	G(_vector, NULL, DEFAULT_STACK, GATE_TASK, DPL0, _gdt << 3)
 
+#define IDT_TABLE_SIZE		(IDT_ENTRIES * sizeof(gate_desc))
 
 static bool idt_setup_done __initdata;
 
@@ -168,7 +169,7 @@ static const __initconst struct idt_data early_pf_idts[] = {
 gate_desc idt_table[IDT_ENTRIES] __page_aligned_bss;
 
 struct desc_ptr idt_descr __ro_after_init = {
-	.size		= (IDT_ENTRIES * 2 * sizeof(unsigned long)) - 1,
+	.size		= IDT_TABLE_SIZE - 1,
 	.address	= (unsigned long) idt_table,
 };