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MIPS: Opt into HAVE_COPY_THREAD_TLS 

This the mips version of commit c1bd55f922 ("x86: opt into
HAVE_COPY_THREAD_TLS, for both 32-bit and 64-bit").

Simply use the tls system call argument instead of extracting the tls
argument by magic from the pt_regs structure.

See commit 3033f14ab7 ("clone: support passing tls argument via C
rather than pt_regs magic") for more background.

Signed-off-by: James Cowgill <James.Cowgill@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/15855/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
James Cowgill 2017-03-31 17:09:58 +01:00 committed by Ralf Baechle
parent 759f534e93
commit f9c4e3a6da
2 changed files with 4 additions and 3 deletions
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1
arch/mips/Kconfig
View File

@ -70,6 +70,7 @@ config MIPS
select HAVE_EXIT_THREAD
select HAVE_REGS_AND_STACK_ACCESS_API
select HAVE_ARCH_HARDENED_USERCOPY
select HAVE_COPY_THREAD_TLS
menu "Machine selection"

6
arch/mips/kernel/process.c
View File

@ -114,8 +114,8 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
/*
* Copy architecture-specific thread state
*/
int copy_thread(unsigned long clone_flags, unsigned long usp,
unsigned long kthread_arg, struct task_struct *p)
int copy_thread_tls(unsigned long clone_flags, unsigned long usp,
unsigned long kthread_arg, struct task_struct *p, unsigned long tls)
{
struct thread_info *ti = task_thread_info(p);
struct pt_regs *childregs, *regs = current_pt_regs();
@ -176,7 +176,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
atomic_set(&p->thread.bd_emu_frame, BD_EMUFRAME_NONE);
if (clone_flags & CLONE_SETTLS)
ti->tp_value = regs->regs[7];
ti->tp_value = tls;
return 0;
}