Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754427Ab2KGJtn (ORCPT ); Wed, 7 Nov 2012 04:49:43 -0500 Received: from us01smtp2.synopsys.com ([198.182.44.80]:58068 "EHLO kiruna.synopsys.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754342Ab2KGJtC (ORCPT ); Wed, 7 Nov 2012 04:49:02 -0500 From: Vineet Gupta To: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org Cc: tglx@linutronix.de, arnd@arndb.de, Vineet Gupta Subject: [RFC PATCH v1 29/31] ARC: switch to generic kernel_thread() Date: Wed, 7 Nov 2012 10:47:52 +0100 Message-Id: <1352281674-2186-30-git-send-email-vgupta@synopsys.com> X-Mailer: git-send-email 1.7.0.4 In-Reply-To: <1352281674-2186-1-git-send-email-vgupta@synopsys.com> References: <1352281674-2186-1-git-send-email-vgupta@synopsys.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2802 Lines: 88 Signed-off-by: Vineet Gupta --- arch/arc/Kconfig | 1 + arch/arc/kernel/process.c | 29 +++++++++-------------------- 2 files changed, 10 insertions(+), 20 deletions(-) diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig index d6983afa..f3aacfc 100644 --- a/arch/arc/Kconfig +++ b/arch/arc/Kconfig @@ -17,6 +17,7 @@ config ARC select GENERIC_FIND_FIRST_BIT # for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP select GENERIC_IRQ_SHOW + select GENERIC_KERNEL_THREAD select GENERIC_PENDING_IRQ if SMP select GENERIC_SMP_IDLE_THREAD select HAVE_GENERIC_HARDIRQS diff --git a/arch/arc/kernel/process.c b/arch/arc/kernel/process.c index fee3e11..d2bb27f 100644 --- a/arch/arc/kernel/process.c +++ b/arch/arc/kernel/process.c @@ -142,22 +142,6 @@ void cpu_idle(void) } } -int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags) -{ - struct pt_regs regs = { - .r0 = (unsigned long)arg, - .r1 = (unsigned long)fn - }; - - regs.status32 = read_aux_reg(0xa); - - /* Ok, create the new process.. */ - return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL, - NULL); - -} -EXPORT_SYMBOL(kernel_thread); - asmlinkage void ret_from_fork(void); asmlinkage void ret_from_kernel_thread(void) __attribute__((noreturn)); @@ -192,7 +176,7 @@ asmlinkage void ret_from_kernel_thread(void) __attribute__((noreturn)); * ------------------ <===== END of PAGE */ int copy_thread(unsigned long clone_flags, - unsigned long usp, unsigned long topstk, + unsigned long usp, unsigned long arg, struct task_struct *p, struct pt_regs *regs) { struct pt_regs *c_regs; /* child's pt_regs */ @@ -213,10 +197,12 @@ int copy_thread(unsigned long clone_flags, */ p->thread.ksp = (unsigned long)c_callee; /* THREAD_KSP */ - /* Copy parents pt regs on child's kernel mode stack */ - *c_regs = *regs; + if (unlikely(p->flags & PF_KTHREAD)) { + memset(c_regs, 0, sizeof(struct pt_regs)); + c_regs->r0 = arg; /* argument to kernel thread */ + c_regs->r1 = usp; /* function */ + c_regs->status32 = read_aux_reg(0xa); - if (!(user_mode(regs))) { c_regs->sp = (unsigned long)task_thread_info(p) + (THREAD_SIZE - 4); @@ -232,6 +218,9 @@ int copy_thread(unsigned long clone_flags, childksp[0] = 0; /* for POP fp */ childksp[1] = (unsigned long)ret_from_fork; /* for POP blink */ + /* Copy parents pt regs on child's kernel mode stack */ + *c_regs = *regs; + c_regs->sp = usp; c_regs->r0 = 0; /* fork returns 0 in child */ -- 1.7.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/