linux-kernel - [PATCH 12/14] sparc64: rtrap: Remove unneeded need

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Date:   Mon, 11 Mar 2019 22:47:50 +0000
From:   Valentin Schneider <valentin.schneider@....com>
To:     linux-kernel@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>, sparclinux@...r.kernel.org
Subject: [PATCH 12/14] sparc64: rtrap: Remove unneeded need_resched() loop

Since the enabling and disabling of IRQs within preempt_schedule_irq()
is contained in a need_resched() loop, we don't need the outer arch
code loop.

We seem to be looping back somewhere much higher than the usual
preempt/need_resched checks, but AFAICT we would just branch to
'rtrap_no_irq_enable' and then back to 'to_kernel', which is
a need_resched() loop with a few extra steps.

Signed-off-by: Valentin Schneider <valentin.schneider@....com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: sparclinux@...r.kernel.org
---
 arch/sparc/kernel/rtrap_64.S | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/sparc/kernel/rtrap_64.S b/arch/sparc/kernel/rtrap_64.S
index 29aa34f11720..57fb75686957 100644
--- a/arch/sparc/kernel/rtrap_64.S
+++ b/arch/sparc/kernel/rtrap_64.S
@@ -322,7 +322,6 @@ to_kernel:
 		 nop
 		call			preempt_schedule_irq
 		 nop
-		ba,pt			%xcc, rtrap
 #endif
 kern_fpucheck:	ldub			[%g6 + TI_FPDEPTH], %l5
 		brz,pt			%l5, rt_continue
-- 
2.20.1