x86/power/64: Use struct desc_ptr for the IDT in struct saved_context

x86_64's saved_context nonsensically used separate idt_limit and
idt_base fields and then cast &idt_limit to struct desc_ptr *.

This was correct (with -fno-strict-aliasing), but it's confusing,
served no purpose, and required #ifdeffery. Simplify this by
using struct desc_ptr directly.

No change in functionality.

Tested-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Borislav Petkov <bpetkov@suse.de>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Zhang Rui <rui.zhang@intel.com>
Link: http://lkml.kernel.org/r/967909ce38d341b01d45eff53e278e2728a3a93a.1513286253.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/include/asm/suspend_64.h b/arch/x86/include/asm/suspend_64.h
index 7306e91..600e9e0 100644 (file)
--- a/arch/x86/include/asm/suspend_64.h
+++ b/arch/x86/include/asm/suspend_64.h
@@ -30,8 +30,7 @@ struct saved_context {
        u16 gdt_pad; /* Unused */
        struct desc_ptr gdt_desc;
        u16 idt_pad;
-       u16 idt_limit;
-       unsigned long idt_base;
+       struct desc_ptr idt;
        u16 ldt;
        u16 tss;
        unsigned long tr;

diff --git a/arch/x86/power/cpu.c b/arch/x86/power/cpu.c
index 5191de1..472bc8c 100644 (file)
--- a/arch/x86/power/cpu.c
+++ b/arch/x86/power/cpu.c
@@ -82,12 +82,8 @@ static void __save_processor_state(struct saved_context *ctxt)
        /*
         * descriptor tables
         */
-#ifdef CONFIG_X86_32
        store_idt(&ctxt->idt);
-#else
-/* CONFIG_X86_64 */
-       store_idt((struct desc_ptr *)&ctxt->idt_limit);
-#endif
+
        /*
         * We save it here, but restore it only in the hibernate case.
         * For ACPI S3 resume, this is loaded via 'early_gdt_desc' in 64-bit
@@ -219,12 +215,7 @@ static void notrace __restore_processor_state(struct saved_context *ctxt)
         * now restore the descriptor tables to their proper values
         * ltr is done i fix_processor_context().
         */
-#ifdef CONFIG_X86_32
        load_idt(&ctxt->idt);
-#else
-/* CONFIG_X86_64 */
-       load_idt((const struct desc_ptr *)&ctxt->idt_limit);
-#endif
 
 #ifdef CONFIG_X86_64
        /*