[PATCH 15/17] unicore: switch to copy_thread_tls()

From: Christian Brauner
Date: Mon Jun 22 2020 - 19:46:36 EST


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@xxxxxxxxxx>
Signed-off-by: Christian Brauner <christian.brauner@xxxxxxxxxx>
---
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