diff options
| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2017-02-13 15:52:28 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-02-25 11:05:53 +0100 |
| commit | 6215c811b3a8a5fef320588ac0193ea70574c8e6 (patch) | |
| tree | afae24459d42b93f69a70966ea3d6a2bc04f46c6 | |
| parent | bb70b2a03c7c150b292ba2ba83afd31481b11fd6 (diff) | |
x86/vm86: Fix unused variable warning if THP is disabled
commit 3ba5b5ea7dc3a10ef50819b43a9f8de2705f4eec upstream.
GCC complains about unused variable 'vma' in mark_screen_rdonly() if THP is
disabled:
arch/x86/kernel/vm86_32.c: In function ‘mark_screen_rdonly’:
arch/x86/kernel/vm86_32.c:180:26: warning: unused variable ‘vma’
[-Wunused-variable]
struct vm_area_struct *vma = find_vma(mm, 0xA0000);
That's silly. pmd_trans_huge() resolves to 0 when THP is disabled, so the
whole block should be eliminated.
Moving the variable declaration outside the if() block shuts GCC up.
Reported-by: Jérémy Lefaure <jeremy.lefaure@lse.epita.fr>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Tested-by: Borislav Petkov <bp@suse.de>
Cc: Carlos O'Donell <carlos@redhat.com>
Link: http://lkml.kernel.org/r/20170213125228.63645-1-kirill.shutemov@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/x86/kernel/vm86_32.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/x86/kernel/vm86_32.c b/arch/x86/kernel/vm86_32.c index 4b3012888ada..8a1d63591399 100644 --- a/arch/x86/kernel/vm86_32.c +++ b/arch/x86/kernel/vm86_32.c @@ -160,11 +160,12 @@ void save_v86_state(struct kernel_vm86_regs *regs, int retval) static void mark_screen_rdonly(struct mm_struct *mm) { + struct vm_area_struct *vma; + spinlock_t *ptl; pgd_t *pgd; pud_t *pud; pmd_t *pmd; pte_t *pte; - spinlock_t *ptl; int i; down_write(&mm->mmap_sem); @@ -177,7 +178,7 @@ static void mark_screen_rdonly(struct mm_struct *mm) pmd = pmd_offset(pud, 0xA0000); if (pmd_trans_huge(*pmd)) { - struct vm_area_struct *vma = find_vma(mm, 0xA0000); + vma = find_vma(mm, 0xA0000); split_huge_pmd(vma, pmd, 0xA0000); } if (pmd_none_or_clear_bad(pmd)) |