1 files changed, 20 insertions, 15 deletions

diff --git a/arch/tile/kernel/single_step.c b/arch/tile/kernel/single_step.c
index bc1eb586e24d..89529c9f0605 100644
--- a/arch/tile/kernel/single_step.c
+++ b/arch/tile/kernel/single_step.c
@@ -153,6 +153,25 @@ static tile_bundle_bits rewrite_load_store_unaligned(
         if (((unsigned long)addr % size) == 0)
                 return bundle;
 
+        /*
+         * Return SIGBUS with the unaligned address, if requested.
+         * Note that we return SIGBUS even for completely invalid addresses
+         * as long as they are in fact unaligned; this matches what the
+         * tilepro hardware would be doing, if it could provide us with the
+         * actual bad address in an SPR, which it doesn't.
+         */
+        if (unaligned_fixup == 0) {
+                siginfo_t info = {
+                        .si_signo = SIGBUS,
+                        .si_code = BUS_ADRALN,
+                        .si_addr = addr
+                };
+                trace_unhandled_signal("unaligned trap", regs,
+                                       (unsigned long)addr, SIGBUS);
+                force_sig_info(info.si_signo, &info, current);
+                return (tilepro_bundle_bits) 0;
+        }
+
 #ifndef __LITTLE_ENDIAN
 # error We assume little-endian representation with copy_xx_user size 2 here
 #endif
@@ -192,18 +211,6 @@ static tile_bundle_bits rewrite_load_store_unaligned(
                 return (tile_bundle_bits) 0;
         }
 
-        if (unaligned_fixup == 0) {
-                siginfo_t info = {
-                        .si_signo = SIGBUS,
-                        .si_code = BUS_ADRALN,
-                        .si_addr = addr
-                };
-                trace_unhandled_signal("unaligned trap", regs,
-                                       (unsigned long)addr, SIGBUS);
-                force_sig_info(info.si_signo, &info, current);
-                return (tile_bundle_bits) 0;
-        }
-
         if (unaligned_printk || unaligned_fixup_count == 0) {
                 pr_info("Process %d/%s: PC %#lx: Fixup of"
                         " unaligned %s at %#lx.\n",
@@ -339,12 +346,10 @@ void single_step_once(struct pt_regs *regs)
                 }
 
                 /* allocate a cache line of writable, executable memory */
-                down_write(&current->mm->mmap_sem);
-                buffer = (void __user *) do_mmap(NULL, 0, 64,
+                buffer = (void __user *) vm_mmap(NULL, 0, 64,
                                           PROT_EXEC | PROT_READ | PROT_WRITE,
                                           MAP_PRIVATE | MAP_ANONYMOUS,
                                           0);
-                up_write(&current->mm->mmap_sem);
 
                 if (IS_ERR((void __force *)buffer)) {
                         kfree(state);