linux-kernel - [PATCH 4/7] parisc: Implement copy_thread

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Date:   Thu,  2 Jan 2020 18:24:10 +0100
From:   Amanieu d'Antras <amanieu@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Christian Brauner <christian@...uner.io>, stable@...r.kernel.org,
        Amanieu d'Antras <amanieu@...il.com>,
        linux-parisc@...r.kernel.org
Subject: [PATCH 4/7] parisc: Implement copy_thread_tls

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

Signed-off-by: Amanieu d'Antras <amanieu@...il.com>
Cc: linux-parisc@...r.kernel.org
Cc: <stable@...r.kernel.org> # 5.3.x
---
 arch/parisc/Kconfig          | 1 +
 arch/parisc/kernel/process.c | 8 ++++----
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index b16237c95ea3..0c29d6cb2c8d 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -62,6 +62,7 @@ config PARISC
 	select HAVE_FTRACE_MCOUNT_RECORD if HAVE_DYNAMIC_FTRACE
 	select HAVE_KPROBES_ON_FTRACE
 	select HAVE_DYNAMIC_FTRACE_WITH_REGS
+	select HAVE_COPY_THREAD_TLS
 
 	help
 	  The PA-RISC microprocessor is designed by Hewlett-Packard and used
diff --git a/arch/parisc/kernel/process.c b/arch/parisc/kernel/process.c
index ecc5c2771208..230a6422b99f 100644
--- a/arch/parisc/kernel/process.c
+++ b/arch/parisc/kernel/process.c
@@ -208,8 +208,8 @@ arch_initcall(parisc_idle_init);
  * Copy architecture-specific thread state
  */
 int
-copy_thread(unsigned long clone_flags, unsigned long usp,
-	    unsigned long kthread_arg, struct task_struct *p)
+copy_thread_tls(unsigned long clone_flags, unsigned long usp,
+	    unsigned long kthread_arg, struct task_struct *p, unsigned long tls)
 {
 	struct pt_regs *cregs = &(p->thread.regs);
 	void *stack = task_stack_page(p);
@@ -254,9 +254,9 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
 		cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN + FRAME_SIZE;
 		cregs->kpc = (unsigned long) &child_return;
 
-		/* Setup thread TLS area from the 4th parameter in clone */
+		/* Setup thread TLS area */
 		if (clone_flags & CLONE_SETTLS)
-			cregs->cr27 = cregs->gr[23];
+			cregs->cr27 = tls;
 	}
 
 	return 0;
-- 
2.24.1