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x86/entry: Fix allnoconfig build warning
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>
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@ -328,7 +328,7 @@ DEFINE_IDTENTRY_DF(exc_double_fault)
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static const char str[] = "double fault";
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struct task_struct *tsk = current;
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#ifdef CONFIG_X86_64
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#ifdef CONFIG_VMAP_STACK
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unsigned long address = read_cr2();
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#endif
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