Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=cf89ec924da5b76cbff293a1b378f312c7161411
Commit: cf89ec924da5b76cbff293a1b378f312c7161411
Parent: 6118f76fb7408bad7631345cc41a5f0efc49ce3e
Author: Harvey Harrison <[EMAIL PROTECTED]>
AuthorDate: Mon Feb 4 16:47:56 2008 +0100
Committer: Ingo Molnar <[EMAIL PROTECTED]>
CommitDate: Mon Feb 4 16:47:56 2008 +0100
x86: reduce ifdef sections in fault.c
Signed-off-by: Harvey Harrison <[EMAIL PROTECTED]>
Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
Signed-off-by: Thomas Gleixner <[EMAIL PROTECTED]>
---
arch/x86/mm/fault.c | 31 +++++++++----------------------
1 files changed, 9 insertions(+), 22 deletions(-)
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index e4440d0..3fff490 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -508,6 +508,10 @@ static int vmalloc_fault(unsigned long address)
pmd_t *pmd, *pmd_ref;
pte_t *pte, *pte_ref;
+ /* Make sure we are in vmalloc area */
+ if (!(address >= VMALLOC_START && address < VMALLOC_END))
+ return -1;
+
/* Copy kernel mappings over when needed. This can also
happen within a race in page table update. In the later
case just flush. */
@@ -603,6 +607,9 @@ void __kprobes do_page_fault(struct pt_regs *regs, unsigned
long error_code)
*/
#ifdef CONFIG_X86_32
if (unlikely(address >= TASK_SIZE)) {
+#else
+ if (unlikely(address >= TASK_SIZE64)) {
+#endif
if (!(error_code & (PF_RSVD|PF_USER|PF_PROT)) &&
vmalloc_fault(address) >= 0)
return;
@@ -618,6 +625,8 @@ void __kprobes do_page_fault(struct pt_regs *regs, unsigned
long error_code)
goto bad_area_nosemaphore;
}
+
+#ifdef CONFIG_X86_32
/* It's safe to allow irq's after cr2 has been saved and the vmalloc
fault has been handled. */
if (regs->flags & (X86_EFLAGS_IF|VM_MASK))
@@ -630,28 +639,6 @@ void __kprobes do_page_fault(struct pt_regs *regs,
unsigned long error_code)
if (in_atomic() || !mm)
goto bad_area_nosemaphore;
#else /* CONFIG_X86_64 */
- if (unlikely(address >= TASK_SIZE64)) {
- /*
- * Don't check for the module range here: its PML4
- * is always initialized because it's shared with the main
- * kernel text. Only vmalloc may need PML4 syncups.
- */
- if (!(error_code & (PF_RSVD|PF_USER|PF_PROT)) &&
- ((address >= VMALLOC_START && address < VMALLOC_END))) {
- if (vmalloc_fault(address) >= 0)
- return;
- }
-
- /* Can handle a stale RO->RW TLB */
- if (spurious_fault(address, error_code))
- return;
-
- /*
- * Don't take the mm semaphore here. If we fixup a prefetch
- * fault we could otherwise deadlock.
- */
- goto bad_area_nosemaphore;
- }
if (likely(regs->flags & X86_EFLAGS_IF))
local_irq_enable();
-
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