Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull additional x86 fixes from Peter Anvin:
 - address a long-standing bug related to when a kernel-spawned process
   gets a signal on an i386 kernel compiled without CONFIG_VM86.

 - fix the newly introduced build warning in arch/x86/boot.

 - fix a typo in the i386 system call table which affects building some
   libcs.

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86-32: Fix endless loop when processing signals for kernel tasks
  x86, boot: Correct CFLAGS for hostprogs
  x86-32: Fix typo for mq_getsetattr in syscall table

1 files changed, 10 insertions, 7 deletions

diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S
index 79d97e68f042..7b784f4ef1e4 100644
--- a/arch/x86/kernel/entry_32.S
+++ b/arch/x86/kernel/entry_32.S
@@ -98,12 +98,6 @@
 #endif
 .endm
 
-#ifdef CONFIG_VM86
-#define resume_userspace_sig    check_userspace
-#else
-#define resume_userspace_sig    resume_userspace
-#endif
-
 /*
  * User gs save/restore
  *
@@ -327,10 +321,19 @@ ret_from_exception:
         preempt_stop(CLBR_ANY)
 ret_from_intr:
         GET_THREAD_INFO(%ebp)
-check_userspace:
+resume_userspace_sig:
+#ifdef CONFIG_VM86
         movl PT_EFLAGS(%esp), %eax      # mix EFLAGS and CS
         movb PT_CS(%esp), %al
         andl $(X86_EFLAGS_VM | SEGMENT_RPL_MASK), %eax
+#else
+        /*
+         * We can be coming here from a syscall done in the kernel space,
+         * e.g. a failed kernel_execve().
+         */
+        movl PT_CS(%esp), %eax
+        andl $SEGMENT_RPL_MASK, %eax
+#endif
         cmpl $USER_RPL, %eax
         jb resume_kernel                # not returning to v8086 or userspace