[PATCH] arm64: entry: always restore x0 from the stack on syscall return
From: catalin.marinas@arm.com (Catalin Marinas)
Date: 2015-08-19 16:03:24
Also in:
stable
On Wed, Aug 19, 2015 at 04:09:49PM +0100, Will Deacon wrote:
quoted hunk ↗ jump to hunk
@@ -613,13 +609,14 @@ ENDPROC(cpu_switch_to) */ ret_fast_syscall: disable_irq // disable interrupts + str x0, [sp, #S_X0] // returned x0 ldr x1, [tsk, #TI_FLAGS] // re-check for syscall tracing and x2, x1, #_TIF_SYSCALL_WORK cbnz x2, ret_fast_syscall_trace and x2, x1, #_TIF_WORK_MASK - cbnz x2, fast_work_pending + cbnz x2, work_pending enable_step_tsk x1, x2 - kernel_exit 0, ret = 1 + kernel_exit 0 ret_fast_syscall_trace: enable_irq // enable interrupts b __sys_trace_return
There is another str x0 in __sys_trace_return which I think we could remove. -- Catalin