linux-kernel - [PATCH 12/17] microblaze: switch to copy_thread

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Message-Id: <20200622234326.906346-13-christian.brauner@ubuntu.com>
Date:   Tue, 23 Jun 2020 01:43:21 +0200
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     linux-kernel@...r.kernel.org
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Michal Simek <monstr@...str.eu>
Subject: [PATCH 12/17] microblaze: switch to copy_thread_tls()

Use the copy_thread_tls() calling convention which passes tls through a
register. This is required so we can remove the copy_thread{_tls}() split
and remove the HAVE_COPY_THREAD_TLS macro.

Cc: Michal Simek <monstr@...str.eu>
Signed-off-by: Christian Brauner <christian.brauner@...ntu.com>
---
 arch/microblaze/Kconfig          | 1 +
 arch/microblaze/kernel/process.c | 6 +++---
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index d262ac0c8714..e3a211a41880 100644
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig
@@ -46,6 +46,7 @@ config MICROBLAZE
 	select CPU_NO_EFFICIENT_FFS
 	select MMU_GATHER_NO_RANGE if MMU
 	select SPARSE_IRQ
+	select HAVE_COPY_THREAD_TLS
 
 # Endianness selection
 choice
diff --git a/arch/microblaze/kernel/process.c b/arch/microblaze/kernel/process.c
index 6527ec22f158..c2ca9c326510 100644
--- a/arch/microblaze/kernel/process.c
+++ b/arch/microblaze/kernel/process.c
@@ -54,8 +54,8 @@ void flush_thread(void)
 {
 }
 
-int copy_thread(unsigned long clone_flags, unsigned long usp,
-		unsigned long arg, struct task_struct *p)
+int copy_thread_tls(unsigned long clone_flags, unsigned long usp,
+		    unsigned long arg, struct task_struct *p, unsigned long tls)
 {
 	struct pt_regs *childregs = task_pt_regs(p);
 	struct thread_info *ti = task_thread_info(p);
@@ -114,7 +114,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
 	 *  which contains TLS area
 	 */
 	if (clone_flags & CLONE_SETTLS)
-		childregs->r21 = childregs->r10;
+		childregs->r21 = tls;
 
 	return 0;
 }
-- 
2.27.0