linux-kernel - [PATCH] csky: Implement copy_thread

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Message-Id: <20200212022651.11169-1-guoren@kernel.org>
Date:   Wed, 12 Feb 2020 10:26:51 +0800
From:   guoren@...nel.org
To:     linux-csky@...r.kernel.org
Cc:     linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        Guo Ren <guoren@...ux.alibaba.com>,
        Amanieu d'Antras <amanieu@...il.com>
Subject: [PATCH] csky: Implement copy_thread_tls

From: Guo Ren <guoren@...ux.alibaba.com>

This is required for clone3 which passes the TLS value through a
struct rather than a register.

Cc: Amanieu d'Antras <amanieu@...il.com>
Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
---
 arch/csky/Kconfig          | 1 +
 arch/csky/kernel/process.c | 7 ++++---
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig
index 72b2999a889a..047427f71d83 100644
--- a/arch/csky/Kconfig
+++ b/arch/csky/Kconfig
@@ -36,6 +36,7 @@ config CSKY
 	select GX6605S_TIMER if CPU_CK610
 	select HAVE_ARCH_TRACEHOOK
 	select HAVE_ARCH_AUDITSYSCALL
+	select HAVE_COPY_THREAD_TLS
 	select HAVE_DYNAMIC_FTRACE
 	select HAVE_FUNCTION_TRACER
 	select HAVE_FUNCTION_GRAPH_TRACER
diff --git a/arch/csky/kernel/process.c b/arch/csky/kernel/process.c
index 5349cd8c0f30..f7b231ca269a 100644
--- a/arch/csky/kernel/process.c
+++ b/arch/csky/kernel/process.c
@@ -40,10 +40,11 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
 	return sw->r15;
 }
 
-int copy_thread(unsigned long clone_flags,
+int copy_thread_tls(unsigned long clone_flags,
 		unsigned long usp,
 		unsigned long kthread_arg,
-		struct task_struct *p)
+		struct task_struct *p,
+		unsigned long tls)
 {
 	struct switch_stack *childstack;
 	struct pt_regs *childregs = task_pt_regs(p);
@@ -70,7 +71,7 @@ int copy_thread(unsigned long clone_flags,
 			childregs->usp = usp;
 		if (clone_flags & CLONE_SETTLS)
 			task_thread_info(p)->tp_value = childregs->tls
-						      = childregs->regs[0];
+						      = tls;
 
 		childregs->a0 = 0;
 		childstack->r15 = (unsigned long) ret_from_fork;
-- 
2.17.0