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Mon, 30 Dec 2019 03:54:50 -0800 (PST) Date: Mon, 30 Dec 2019 17:24:48 +0530 From: afzal mohammed To: Russell King Subject: [RFC PATCH 1/2] ARM: !MMU: v7-M: prepare preemption support Message-ID: <7a69ad9c2db39f6f17225eb0e79057bc221cc4a4.1577705829.git.afzal.mohd.ma@gmail.com> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.3 (2018-01-21) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191230_035451_445253_7A1B111F X-CRM114-Status: GOOD ( 12.89 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Vladimir Murzin , Catalin Marinas , linux-kernel@vger.kernel.org, Uwe =?iso-8859-1?Q?Kleine-K=F6nig?= , Greg Ungerer , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 --- 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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel