diff options
| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2017-07-19 14:49:41 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-08-03 16:06:50 +1000 |
| commit | b15021d994f09e9309ad37c1821ce4e3ee0cd62d (patch) | |
| tree | 366422ca2235759bd0c34ab3eef0480e5272ba0e /arch/powerpc/mm/fault.c | |
| parent | 11ccdd33d6ad8d0ade866fc1c6c691c0c57b6ace (diff) | |
powerpc/mm: Add a bunch of (un)likely annotations to do_page_fault
Mostly for the failure cases
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm/fault.c')
| -rw-r--r-- | arch/powerpc/mm/fault.c | 20 |
1 files changed, 10 insertions, 10 deletions
diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c index 792844559343..572c80129581 100644 --- a/arch/powerpc/mm/fault.c +++ b/arch/powerpc/mm/fault.c @@ -400,7 +400,7 @@ static int __do_page_fault(struct pt_regs *regs, unsigned long address, * source. If this is invalid we can skip the address space check, * thus avoiding the deadlock. */ - if (!down_read_trylock(&mm->mmap_sem)) { + if (unlikely(!down_read_trylock(&mm->mmap_sem))) { if (!is_user && !search_exception_tables(regs->nip)) return bad_area_nosemaphore(regs, address); @@ -416,11 +416,11 @@ retry: } vma = find_vma(mm, address); - if (!vma) + if (unlikely(!vma)) return bad_area(regs, address); - if (vma->vm_start <= address) + if (likely(vma->vm_start <= address)) goto good_area; - if (!(vma->vm_flags & VM_GROWSDOWN)) + if (unlikely(!(vma->vm_flags & VM_GROWSDOWN))) return bad_area(regs, address); /* @@ -453,7 +453,7 @@ retry: if (address + 2048 < uregs->gpr[1] && !store_update_sp) return bad_area(regs, address); } - if (expand_stack(vma, address)) + if (unlikely(expand_stack(vma, address))) return bad_area(regs, address); good_area: @@ -468,18 +468,18 @@ good_area: * below wouldn't be valid on those processors. This -may- * break programs compiled with a really old ABI though. */ - if (!(vma->vm_flags & VM_EXEC) && - (cpu_has_feature(CPU_FTR_NOEXECUTE) || - !(vma->vm_flags & (VM_READ | VM_WRITE)))) + if (unlikely(!(vma->vm_flags & VM_EXEC) && + (cpu_has_feature(CPU_FTR_NOEXECUTE) || + !(vma->vm_flags & (VM_READ | VM_WRITE))))) return bad_area(regs, address); /* a write */ } else if (is_write) { - if (!(vma->vm_flags & VM_WRITE)) + if (unlikely(!(vma->vm_flags & VM_WRITE))) return bad_area(regs, address); flags |= FAULT_FLAG_WRITE; /* a read */ } else { - if (!(vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE))) + if (unlikely(!(vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE)))) return bad_area(regs, address); } |