linux-kernel - [PATCH 15/17] unicore: switch to copy_thread

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Date:   Tue, 23 Jun 2020 01:43:24 +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>,
        Guan Xuetao <gxt@....edu.cn>
Subject: [PATCH 15/17] unicore: 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: Guan Xuetao <gxt@....edu.cn>
Signed-off-by: Christian Brauner <christian.brauner@...ntu.com>
---
 arch/unicore32/Kconfig          | 1 +
 arch/unicore32/kernel/process.c | 8 ++++----
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/unicore32/Kconfig b/arch/unicore32/Kconfig
index 11ba1839d198..01451cf500d2 100644
--- a/arch/unicore32/Kconfig
+++ b/arch/unicore32/Kconfig
@@ -22,6 +22,7 @@ config UNICORE32
 	select MODULES_USE_ELF_REL
 	select NEED_DMA_MAP_STATE
 	select MMU_GATHER_NO_RANGE if MMU
+	select HAVE_COPY_THREAD_TLS
 	help
 	  UniCore-32 is 32-bit Instruction Set Architecture,
 	  including a series of low-power-consumption RISC chip
diff --git a/arch/unicore32/kernel/process.c b/arch/unicore32/kernel/process.c
index b4fd3a604a18..49a305565a53 100644
--- a/arch/unicore32/kernel/process.c
+++ b/arch/unicore32/kernel/process.c
@@ -219,9 +219,9 @@ void release_thread(struct task_struct *dead_task)
 asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
 asmlinkage void ret_from_kernel_thread(void) __asm__("ret_from_kernel_thread");
 
-int
-copy_thread(unsigned long clone_flags, unsigned long stack_start,
-	    unsigned long stk_sz, struct task_struct *p)
+int copy_thread_tls(unsigned long clone_flags, unsigned long stack_start,
+		    unsigned long stk_sz, struct task_struct *p,
+		    unsigned long tls)
 {
 	struct thread_info *thread = task_thread_info(p);
 	struct pt_regs *childregs = task_pt_regs(p);
@@ -241,7 +241,7 @@ copy_thread(unsigned long clone_flags, unsigned long stack_start,
 			childregs->UCreg_sp = stack_start;
 
 		if (clone_flags & CLONE_SETTLS)
-			childregs->UCreg_16 = childregs->UCreg_03;
+			childregs->UCreg_16 = tls;
 	}
 	return 0;
 }
-- 
2.27.0