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x86/entry: Fix allnoconfig build warning

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The following commit:

  095b7a3e7745 ("x86/entry: Convert double fault exception to IDTENTRY_DF")

introduced a new build warning on 64-bit allnoconfig kernels, that have CONFIG_VMAP_STACK disabled:

  arch/x86/kernel/traps.c:332:16: warning: unused variable ‘address’ [-Wunused-variable]

This variable is only used if CONFIG_VMAP_STACK is defined, so make it
dependent on that, not CONFIG_X86_64.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Alexandre Chartre <alexandre.chartre@oracle.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
This commit is contained in:
Ingo Molnar 2020-05-25 09:42:41 +02:00 committed by Thomas Gleixner
parent c29c775a55
commit 7102cb0713
1 changed files with 1 additions and 1 deletions
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arch/x86/kernel/traps.c
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@ -328,7 +328,7 @@ DEFINE_IDTENTRY_DF(exc_double_fault)
static const char str[] = "double fault";
struct task_struct *tsk = current;
#ifdef CONFIG_X86_64
#ifdef CONFIG_VMAP_STACK
unsigned long address = read_cr2();
#endif