Merge tag 'v3.10.91' into update

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / arm64 / mm / fault.c

diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index 94a2b644b95951add24053867e63aa925059c8b9..3918de991872bb0eed1d4982a9774f9100ba3b60 100644 (file)
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -199,13 +199,6 @@ static int __kprobes do_page_fault(unsigned long addr, unsigned int esr,
        unsigned long vm_flags = VM_READ | VM_WRITE | VM_EXEC;
        unsigned int mm_flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
 
-       if (esr & ESR_LNX_EXEC) {
-               vm_flags = VM_EXEC;
-       } else if ((esr & ESR_WRITE) && !(esr & ESR_CM)) {
-               vm_flags = VM_WRITE;
-               mm_flags |= FAULT_FLAG_WRITE;
-       }
-
        tsk = current;
        mm  = tsk->mm;
 
@@ -220,6 +213,16 @@ static int __kprobes do_page_fault(unsigned long addr, unsigned int esr,
        if (in_atomic() || !mm)
                goto no_context;
 
+       if (user_mode(regs))
+               mm_flags |= FAULT_FLAG_USER;
+
+       if (esr & ESR_LNX_EXEC) {
+               vm_flags = VM_EXEC;
+       } else if ((esr & ESR_WRITE) && !(esr & ESR_CM)) {
+               vm_flags = VM_WRITE;
+               mm_flags |= FAULT_FLAG_WRITE;
+       }
+
        /*
         * As per x86, we may deadlock here. However, since the kernel only
         * validly references user space from well defined areas of the code,
@@ -275,6 +278,7 @@ retry:
                         * starvation.
                         */
                        mm_flags &= ~FAULT_FLAG_ALLOW_RETRY;
+                       mm_flags |= FAULT_FLAG_TRIED;
                        goto retry;
                }
        }
@@ -288,6 +292,13 @@ retry:
                              VM_FAULT_BADACCESS))))
                return 0;
 
+       /*
+        * If we are in kernel mode at this point, we have no context to
+        * handle this fault with.
+        */
+       if (!user_mode(regs))
+               goto no_context;
+
        if (fault & VM_FAULT_OOM) {
                /*
                 * We ran out of memory, call the OOM killer, and return to
@@ -298,13 +309,6 @@ retry:
                return 0;
        }
 
-       /*
-        * If we are in kernel mode at this point, we have no context to
-        * handle this fault with.
-        */
-       if (!user_mode(regs))
-               goto no_context;
-
        if (fault & VM_FAULT_SIGBUS) {
                /*
                 * We had some memory, but were unable to successfully fix up