Merge branch 'for-linus' of git://git.o-hand.com/linux-rpurdie-backlight

[linux-2.6-omap-h63xx.git] / arch / powerpc / mm / fault.c

diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index 3767211b3d0f665e0666dcfcea246009c1d159ed..7b2510799266654e4fb8ec1283adfbbbfb159158 100644 (file)
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -167,10 +167,8 @@ int __kprobes do_page_fault(struct pt_regs *regs, unsigned long address,
        if (notify_page_fault(regs))
                return 0;
 
-       if (trap == 0x300) {
-               if (debugger_fault_handler(regs))
-                       return 0;
-       }
+       if (unlikely(debugger_fault_handler(regs)))
+               return 0;
 
        /* On a kernel SLB miss we can only check for a valid exception entry */
        if (!user_mode(regs) && (address >= TASK_SIZE))
@@ -189,7 +187,7 @@ int __kprobes do_page_fault(struct pt_regs *regs, unsigned long address,
                        return SIGSEGV;
                /* in_atomic() in user mode is really bad,
                   as is current->mm == NULL. */
-               printk(KERN_EMERG "Page fault in user mode with"
+               printk(KERN_EMERG "Page fault in user mode with "
                       "in_atomic() = %d mm = %p\n", in_atomic(), mm);
                printk(KERN_EMERG "NIP = %lx  MSR = %lx\n",
                       regs->nip, regs->msr);
@@ -283,7 +281,13 @@ good_area:
                /* protection fault */
                if (error_code & DSISR_PROTFAULT)
                        goto bad_area;
-               if (!(vma->vm_flags & VM_EXEC))
+               /*
+                * Allow execution from readable areas if the MMU does not
+                * provide separate controls over reading and executing.
+                */
+               if (!(vma->vm_flags & VM_EXEC) &&
+                   (cpu_has_feature(CPU_FTR_NOEXECUTE) ||
+                    !(vma->vm_flags & (VM_READ | VM_WRITE))))
                        goto bad_area;
 #else
                pte_t *ptep;
@@ -303,7 +307,7 @@ good_area:
                                        set_bit(PG_arch_1, &page->flags);
                                }
                                pte_update(ptep, 0, _PAGE_HWEXEC);
-                               _tlbie(address);
+                               _tlbie(address, mm->context.id);
                                pte_unmap_unlock(ptep, ptl);
                                up_read(&mm->mmap_sem);
                                return 0;
@@ -369,7 +373,7 @@ bad_area_nosemaphore:
  */
 out_of_memory:
        up_read(&mm->mmap_sem);
-       if (is_init(current)) {
+       if (is_global_init(current)) {
                yield();
                down_read(&mm->mmap_sem);
                goto survive;