vm: add VM_FAULT_SIGSEGV handling support

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / alpha / mm / fault.c

diff --git a/arch/alpha/mm/fault.c b/arch/alpha/mm/fault.c
index 0c4132dd3507a0b62b3c40c2fc6fd4065a325262..9d0ac091a52a7d16cf1f78f402ab48c511924a24 100644 (file)
--- a/arch/alpha/mm/fault.c
+++ b/arch/alpha/mm/fault.c
@@ -89,8 +89,7 @@ do_page_fault(unsigned long address, unsigned long mmcsr,
        const struct exception_table_entry *fixup;
        int fault, si_code = SEGV_MAPERR;
        siginfo_t info;
-       unsigned int flags = (FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE |
-                             (cause > 0 ? FAULT_FLAG_WRITE : 0));
+       unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
 
        /* As of EV6, a load into $31/$f31 is a prefetch, and never faults
           (or is suppressed by the PALcode).  Support that for older CPUs
@@ -115,7 +114,8 @@ do_page_fault(unsigned long address, unsigned long mmcsr,
        if (address >= TASK_SIZE)
                goto vmalloc_fault;
 #endif
-
+       if (user_mode(regs))
+               flags |= FAULT_FLAG_USER;
 retry:
        down_read(&mm->mmap_sem);
        vma = find_vma(mm, address);
@@ -142,6 +142,7 @@ retry:
        } else {
                if (!(vma->vm_flags & VM_WRITE))
                        goto bad_area;
+               flags |= FAULT_FLAG_WRITE;
        }
 
        /* If for any reason at all we couldn't handle the fault,
@@ -155,6 +156,8 @@ retry:
        if (unlikely(fault & VM_FAULT_ERROR)) {
                if (fault & VM_FAULT_OOM)
                        goto out_of_memory;
+               else if (fault & VM_FAULT_SIGSEGV)
+                       goto bad_area;
                else if (fault & VM_FAULT_SIGBUS)
                        goto do_sigbus;
                BUG();