1 files changed, 13 insertions, 19 deletions

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index c251be745107..bd5bbddddf91 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -146,7 +146,7 @@ ENTRY(ftrace_graph_caller)
 END(ftrace_graph_caller)
 
 GLOBAL(return_to_handler)
-        subq  $80, %rsp
+        subq  $24, %rsp
 
         /* Save the return values */
         movq %rax, (%rsp)
@@ -155,11 +155,11 @@ GLOBAL(return_to_handler)
 
         call ftrace_return_to_handler
 
-        movq %rax, 72(%rsp)
+        movq %rax, %rdi
         movq 8(%rsp), %rdx
         movq (%rsp), %rax
-        addq $72, %rsp
-        retq
+        addq $24, %rsp
+        jmp *%rdi
 #endif
 
 
@@ -536,20 +536,13 @@ sysret_signal:
         bt $TIF_SYSCALL_AUDIT,%edx
         jc sysret_audit
 #endif
-        /* edx: work flags (arg3) */
-        leaq -ARGOFFSET(%rsp),%rdi # &pt_regs -> arg1
-        xorl %esi,%esi # oldset -> arg2
-        SAVE_REST
-        FIXUP_TOP_OF_STACK %r11
-        call do_notify_resume
-        RESTORE_TOP_OF_STACK %r11
-        RESTORE_REST
-        movl $_TIF_WORK_MASK,%edi
-        /* Use IRET because user could have changed frame. This
-           works because ptregscall_common has called FIXUP_TOP_OF_STACK. */
-        DISABLE_INTERRUPTS(CLBR_NONE)
-        TRACE_IRQS_OFF
-        jmp int_with_check
+        /*
+         * We have a signal, or exit tracing or single-step.
+         * These all wind up with the iret return path anyway,
+         * so just join that path right now.
+         */
+        FIXUP_TOP_OF_STACK %r11, -ARGOFFSET
+        jmp int_check_syscall_exit_work
 
 badsys:
         movq $-ENOSYS,RAX-ARGOFFSET(%rsp)
@@ -654,6 +647,7 @@ int_careful:
 int_very_careful:
         TRACE_IRQS_ON
         ENABLE_INTERRUPTS(CLBR_NONE)
+int_check_syscall_exit_work:
         SAVE_REST
         /* Check for syscall exit trace */
         testl $_TIF_WORK_SYSCALL_EXIT,%edx
@@ -1021,7 +1015,7 @@ apicinterrupt ERROR_APIC_VECTOR \
 apicinterrupt SPURIOUS_APIC_VECTOR \
         spurious_interrupt smp_spurious_interrupt
 
-#ifdef CONFIG_PERF_COUNTERS
+#ifdef CONFIG_PERF_EVENTS
 apicinterrupt LOCAL_PENDING_VECTOR \
         perf_pending_interrupt smp_perf_pending_interrupt
 #endif