From patchwork Thu Nov 3 07:50:46 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guo Ren X-Patchwork-Id: 13029668 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id CA056C4332F for ; Thu, 3 Nov 2022 07:53:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=cZq5rBj5zwoUecTp/6C+RuY+1LMceCyt3x37ycKhGrc=; b=lJSbUIKbNZ6Zx4 fVWAeFEZQtmBClr8b5jq8b/2gQ3wzHT8HfFFdQYXoQqac4S12F12WxVMQFultkdvfEaziOz+qCotJ xoyytCbniN9/qQdFqd7zSVeamfBZcMKn58527w7EFIasQSNzxNLfHLuoYUtv8OHJrYdNgW8LhlFn+ Yp9lXZS+ukzSXr/RRUHHwmwT9jwUh/u7+1znX8Z/OXkmgzH5fcjE9EcHTNTc675XgF4NSX38VVhSS 1/406nrGSp+j7LNJJquDJphmG5kGsiaiH4Wq9rXzZy63k7UYgIs7A3gjZ/YOcQ8mHKabXNkuWLhYU //tFVy9vHg7RcB0sHeaQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oqV2F-00GWd4-EZ; Thu, 03 Nov 2022 07:53:11 +0000 Received: from ams.source.kernel.org ([145.40.68.75]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oqV2D-00GWaa-1F for linux-riscv@lists.infradead.org; Thu, 03 Nov 2022 07:53:10 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 9F0C0B8269F; Thu, 3 Nov 2022 07:53:07 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8CD29C43142; Thu, 3 Nov 2022 07:52:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1667461986; bh=6mT3EvXtlXRLieGroNt7lX/Uc/Cj0ALZoGomS8K8Gk0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=V78/QTVTsB/9IOs1gnYjFDMP1uUhzfuBshCTyZNFpHP7GefsP9Y/+s8ZxegVRgS9H Q4elPrDERZP/B1orRR5ncmIFm/CVhFzFvV6hhmgXcaWSE996eIjcfsvQNAaHUL8GfE 1m9I7tauLWftwZOX211ZBKdHscRLDyASdVhQqKkJGcUX6YwS0JG5tIkxHsiohaZMAS c6Vy0eIzN1yYirikeiGJaS7ldS6GiJd6xo351gtewYWIe0M9ul5dbvh0N38Q8ARzKu AbkSbYbViqe0ZQrnrcuQ/fLeGatnJ7b8DCjWeyfblPKy/qrheu62XeQsbtNAAl/Ncy CER7YDiN44MZw== From: guoren@kernel.org To: arnd@arndb.de, guoren@kernel.org, palmer@rivosinc.com, tglx@linutronix.de, peterz@infradead.org, luto@kernel.org, conor.dooley@microchip.com, heiko@sntech.de, jszhang@kernel.org, lazyparser@gmail.com, falcon@tinylab.org, chenhuacai@kernel.org, apatel@ventanamicro.com, atishp@atishpatra.org, palmer@dabbelt.com, paul.walmsley@sifive.com, mark.rutland@arm.com, zouyipeng@huawei.com, bigeasy@linutronix.de, David.Laight@aculab.com, chenzhongjin@huawei.com, greentime.hu@sifive.com, andy.chiu@sifive.com Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org Subject: [PATCH -next V8 13/14] riscv: consolidate ret_from_kernel_thread into ret_from_fork Date: Thu, 3 Nov 2022 03:50:46 -0400 Message-Id: <20221103075047.1634923-14-guoren@kernel.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20221103075047.1634923-1-guoren@kernel.org> References: <20221103075047.1634923-1-guoren@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221103_005309_386225_EFBB69B6 X-CRM114-Status: GOOD ( 12.78 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org From: Jisheng Zhang The ret_from_kernel_thread() behaves similarly with ret_from_fork(), the only difference is whether call the fn(arg) or not, this can be achieved by testing fn is NULL or not, I.E s0 is 0 or not. Many architectures have done the same thing, it make entry.S more clean. Signed-off-by: Jisheng Zhang Signed-off-by: Guo Ren --- arch/riscv/kernel/entry.S | 12 +++--------- arch/riscv/kernel/process.c | 5 ++--- 2 files changed, 5 insertions(+), 12 deletions(-) diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S index b1babad5f829..d4c061f7fbfa 100644 --- a/arch/riscv/kernel/entry.S +++ b/arch/riscv/kernel/entry.S @@ -132,7 +132,6 @@ END(handle_exception) * caller list: * - handle_exception * - ret_from_fork - * - ret_from_kernel_thread */ ENTRY(ret_from_exception) REG_L s0, PT_STATUS(sp) @@ -326,20 +325,15 @@ END(handle_kernel_stack_overflow) ENTRY(ret_from_fork) call schedule_tail - move a0, sp /* pt_regs */ - la ra, ret_from_exception - tail syscall_exit_to_user_mode -ENDPROC(ret_from_fork) - -ENTRY(ret_from_kernel_thread) - call schedule_tail + beqz s0, 1f /* not from kernel thread */ /* Call fn(arg) */ move a0, s1 jalr s0 +1: move a0, sp /* pt_regs */ la ra, ret_from_exception tail syscall_exit_to_user_mode -ENDPROC(ret_from_kernel_thread) +ENDPROC(ret_from_fork) /* diff --git a/arch/riscv/kernel/process.c b/arch/riscv/kernel/process.c index b0c63e8e867e..5108c76a14dd 100644 --- a/arch/riscv/kernel/process.c +++ b/arch/riscv/kernel/process.c @@ -34,7 +34,6 @@ EXPORT_SYMBOL(__stack_chk_guard); #endif extern asmlinkage void ret_from_fork(void); -extern asmlinkage void ret_from_kernel_thread(void); void arch_cpu_idle(void) { @@ -172,7 +171,6 @@ int copy_thread(struct task_struct *p, const struct kernel_clone_args *args) /* Supervisor/Machine, irqs on: */ childregs->status = SR_PP | SR_PIE; - p->thread.ra = (unsigned long)ret_from_kernel_thread; p->thread.s[0] = (unsigned long)args->fn; p->thread.s[1] = (unsigned long)args->fn_arg; } else { @@ -182,8 +180,9 @@ int copy_thread(struct task_struct *p, const struct kernel_clone_args *args) if (clone_flags & CLONE_SETTLS) childregs->tp = tls; childregs->a0 = 0; /* Return value of fork() */ - p->thread.ra = (unsigned long)ret_from_fork; + p->thread.s[0] = 0; } + p->thread.ra = (unsigned long)ret_from_fork; p->thread.sp = (unsigned long)childregs; /* kernel sp */ return 0; }