Merge tag 'cris-for-4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/jesper...

[cascardo/linux.git] / arch / arm64 / kernel / entry.S

diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index 441420c..223d54a 100644 (file)
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -104,7 +104,7 @@
        str     x20, [sp, #S_ORIG_ADDR_LIMIT]
        mov     x20, #TASK_SIZE_64
        str     x20, [tsk, #TI_ADDR_LIMIT]
-       ALTERNATIVE(nop, SET_PSTATE_UAO(0), ARM64_HAS_UAO, CONFIG_ARM64_UAO)
+       /* No need to reset PSTATE.UAO, hardware's already set it to 0 for us */
        .endif /* \el == 0 */
        mrs     x22, elr_el1
        mrs     x23, spsr_el1
@@ -150,13 +150,7 @@
        ldr     x23, [sp, #S_SP]                // load return stack pointer
        msr     sp_el0, x23
 #ifdef CONFIG_ARM64_ERRATUM_845719
-alternative_if_not ARM64_WORKAROUND_845719
-       nop
-       nop
-#ifdef CONFIG_PID_IN_CONTEXTIDR
-       nop
-#endif
-alternative_else
+alternative_if ARM64_WORKAROUND_845719
        tbz     x22, #4, 1f
 #ifdef CONFIG_PID_IN_CONTEXTIDR
        mrs     x29, contextidr_el1
@@ -165,7 +159,7 @@ alternative_else
        msr contextidr_el1, xzr
 #endif
 1:
-alternative_endif
+alternative_else_nop_endif
 #endif
        .endif
        msr     elr_el1, x21                    // set up the return data
@@ -707,18 +701,13 @@ ret_fast_syscall_trace:
  * Ok, we need to do extra processing, enter the slow path.
  */
 work_pending:
-       tbnz    x1, #TIF_NEED_RESCHED, work_resched
-       /* TIF_SIGPENDING, TIF_NOTIFY_RESUME or TIF_FOREIGN_FPSTATE case */
        mov     x0, sp                          // 'regs'
-       enable_irq                              // enable interrupts for do_notify_resume()
        bl      do_notify_resume
-       b       ret_to_user
-work_resched:
 #ifdef CONFIG_TRACE_IRQFLAGS
-       bl      trace_hardirqs_off              // the IRQs are off here, inform the tracing code
+       bl      trace_hardirqs_on               // enabled while in userspace
 #endif
-       bl      schedule
-
+       ldr     x1, [tsk, #TI_FLAGS]            // re-check for single-step
+       b       finish_ret_to_user
 /*
  * "slow" syscall return path.
  */
@@ -727,6 +716,7 @@ ret_to_user:
        ldr     x1, [tsk, #TI_FLAGS]
        and     x2, x1, #_TIF_WORK_MASK
        cbnz    x2, work_pending
+finish_ret_to_user:
        enable_step_tsk x1, x2
        kernel_exit 0
 ENDPROC(ret_to_user)