linux-kernel - [RFC PATCH 1/2] ARM: !MMU: v7-M: prepare preemption support

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Date:   Mon, 30 Dec 2019 17:24:48 +0530
From:   afzal mohammed <afzal.mohd.ma@...il.com>
To:     Russell King <linux@...linux.org.uk>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Greg Ungerer <gerg@...ux-m68k.org>,
        Vladimir Murzin <vladimir.murzin@....com>
Subject: [RFC PATCH 1/2] ARM: !MMU: v7-M: prepare preemption support

Rearrange getting thread_info pointer & popping lr so as to have an
easy to review diff for preempt support that is going to be added.

Signed-off-by: afzal mohammed <afzal.mohd.ma@...il.com>
---
 arch/arm/kernel/entry-v7m.S | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/arm/kernel/entry-v7m.S b/arch/arm/kernel/entry-v7m.S
index de1f20624be1..581562dbecf3 100644
--- a/arch/arm/kernel/entry-v7m.S
+++ b/arch/arm/kernel/entry-v7m.S
@@ -48,7 +48,7 @@ strerr:	.asciz	"\nUnhandled exception: IPSR = %08lx LR = %08lx\n"
 	@ routine called with r0 = irq number, r1 = struct pt_regs *
 	bl	nvic_handle_irq
 
-	pop	{lr}
+	get_thread_info tsk
 	@
 	@ Check for any pending work if returning to user
 	@
@@ -57,7 +57,6 @@ strerr:	.asciz	"\nUnhandled exception: IPSR = %08lx LR = %08lx\n"
 	tst	r0, V7M_SCB_ICSR_RETTOBASE
 	beq	2f
 
-	get_thread_info tsk
 	ldr	r2, [tsk, #TI_FLAGS]
 	tst	r2, #_TIF_WORK_MASK
 	beq	2f			@ no work pending
@@ -65,6 +64,8 @@ strerr:	.asciz	"\nUnhandled exception: IPSR = %08lx LR = %08lx\n"
 	str	r0, [r1, V7M_SCB_ICSR]	@ raise PendSV
 
 2:
+	pop	{lr}
+
 	@ registers r0-r3 and r12 are automatically restored on exception
 	@ return. r4-r7 were not clobbered in v7m_exception_entry so for
 	@ correctness they don't need to be restored. So only r8-r11 must be
-- 
2.24.1