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| author | Amanieu d'Antras <amanieu@gmail.com> | 2020-01-02 18:24:12 +0100 |
|---|---|---|
| committer | Christian Brauner <christian.brauner@ubuntu.com> | 2020-01-07 13:31:25 +0100 |
| commit | c346b94f8c5d1b7d637522c908209de93305a8eb (patch) | |
| tree | 51c3062c64b2a423fd43e31404c2ca6b29afbe1e | |
| parent | riscv: Implement copy_thread_tls (diff) | |
| download | linux-c346b94f8c5d1b7d637522c908209de93305a8eb.tar.xz linux-c346b94f8c5d1b7d637522c908209de93305a8eb.zip | |
xtensa: 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@gmail.com>
Cc: linux-xtensa@linux-xtensa.org
Cc: <stable@vger.kernel.org> # 5.3.x
Link: https://lore.kernel.org/r/20200102172413.654385-7-amanieu@gmail.com
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
| -rw-r--r-- | arch/xtensa/Kconfig | 1 | ||||
| -rw-r--r-- | arch/xtensa/kernel/process.c | 8 |
2 files changed, 5 insertions, 4 deletions
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig index 4a3fa295d8fe..296c5324dace 100644 --- a/arch/xtensa/Kconfig +++ b/arch/xtensa/Kconfig @@ -24,6 +24,7 @@ config XTENSA select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL select HAVE_ARCH_KASAN if MMU && !XIP_KERNEL select HAVE_ARCH_TRACEHOOK + select HAVE_COPY_THREAD_TLS select HAVE_DEBUG_KMEMLEAK select HAVE_DMA_CONTIGUOUS select HAVE_EXIT_THREAD diff --git a/arch/xtensa/kernel/process.c b/arch/xtensa/kernel/process.c index 9e1c49134c07..3edecc41ef8c 100644 --- a/arch/xtensa/kernel/process.c +++ b/arch/xtensa/kernel/process.c @@ -202,8 +202,9 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) * involved. Much simpler to just not copy those live frames across. */ -int copy_thread(unsigned long clone_flags, unsigned long usp_thread_fn, - unsigned long thread_fn_arg, struct task_struct *p) +int copy_thread_tls(unsigned long clone_flags, unsigned long usp_thread_fn, + unsigned long thread_fn_arg, struct task_struct *p, + unsigned long tls) { struct pt_regs *childregs = task_pt_regs(p); @@ -266,9 +267,8 @@ int copy_thread(unsigned long clone_flags, unsigned long usp_thread_fn, childregs->syscall = regs->syscall; - /* The thread pointer is passed in the '4th argument' (= a5) */ if (clone_flags & CLONE_SETTLS) - childregs->threadptr = childregs->areg[5]; + childregs->threadptr = tls; } else { p->thread.ra = MAKE_RA_FOR_CALL( (unsigned long)ret_from_kernel_thread, 1); |