linux-kernel - Re: [PATCH] x86/vdso: add mremap hook to vm_special

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Date:	Mon, 11 Apr 2016 18:54:25 +0300
From:	Dmitry Safonov <dsafonov@...tuozzo.com>
To:	kbuild test robot <lkp@...el.com>
CC:	<kbuild-all@...org>, <linux-kernel@...r.kernel.org>,
	<luto@...capital.net>, <tglx@...utronix.de>, <mingo@...hat.com>,
	<hpa@...or.com>, <x86@...nel.org>, <akpm@...ux-foundation.org>,
	<linux-mm@...ck.org>, <0x7f454c46@...il.com>
Subject: Re: [PATCH] x86/vdso: add mremap hook to vm_special_mapping

On 04/11/2016 06:41 PM, kbuild test robot wrote:
> Hi Dmitry,
>
> [auto build test WARNING on v4.6-rc3]
> [also build test WARNING on next-20160411]
> [cannot apply to tip/x86/vdso luto/next]
> [if your patch is applied to the wrong git tree, please drop us a note to help improving the system]
>
> url:    https://github.com/0day-ci/linux/commits/Dmitry-Safonov/x86-vdso-add-mremap-hook-to-vm_special_mapping/20160411-232653
> config: x86_64-randconfig-x000-201615 (attached as .config)
> reproduce:
>          # save the attached .config to linux build tree
>          make ARCH=x86_64
>
> All warnings (new ones prefixed by >>):
>
>     arch/x86/entry/vdso/vma.c: In function 'vdso_mremap':
>>> arch/x86/entry/vdso/vma.c:105:18: warning: unused variable 'regs' [-Wunused-variable]
>       struct pt_regs *regs = current_pt_regs();
>                       ^
Thanks, it should go with this:
--->8---
diff --git a/arch/x86/entry/vdso/vma.c b/arch/x86/entry/vdso/vma.c
index 08ac59907cde..7e261e2554c8 100644
--- a/arch/x86/entry/vdso/vma.c
+++ b/arch/x86/entry/vdso/vma.c
@@ -102,7 +102,7 @@ static int vdso_fault(const struct 
vm_special_mapping *sm,
  static int vdso_mremap(const struct vm_special_mapping *sm,
                struct vm_area_struct *new_vma)
  {
-    struct pt_regs *regs = current_pt_regs();
+    struct pt_regs __maybe_unused *regs = current_pt_regs();

  #if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION)
      /* Fixing userspace landing - look at do_fast_syscall_32 */