[PATCH 3/7] arm: Implement copy_thread_tls
From: Amanieu d'Antras <hidden>
Date: 2020-01-02 17:24:33
Also in:
lkml, stable
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
This is required for clone3 which passes the TLS value through a struct rather than a register. Signed-off-by: Amanieu d'Antras <redacted> Cc: linux-arm-kernel@lists.infradead.org Cc: <redacted> # 5.3.x --- arch/arm/Kconfig | 1 + arch/arm/kernel/process.c | 6 +++--- 2 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index ba75e3661a41..96dab76da3b3 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig@@ -72,6 +72,7 @@ config ARM select HAVE_ARM_SMCCC if CPU_V7 select HAVE_EBPF_JIT if !CPU_ENDIAN_BE32 select HAVE_CONTEXT_TRACKING + select HAVE_COPY_THREAD_TLS select HAVE_C_RECORDMCOUNT select HAVE_DEBUG_KMEMLEAK select HAVE_DMA_CONTIGUOUS if MMU
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index cea1c27c29cb..46e478fb5ea2 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c@@ -226,8 +226,8 @@ void release_thread(struct task_struct *dead_task) asmlinkage void ret_from_fork(void) __asm__("ret_from_fork"); int -copy_thread(unsigned long clone_flags, unsigned long stack_start, - unsigned long stk_sz, struct task_struct *p) +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);
@@ -261,7 +261,7 @@ copy_thread(unsigned long clone_flags, unsigned long stack_start, clear_ptrace_hw_breakpoint(p); if (clone_flags & CLONE_SETTLS) - thread->tp_value[0] = childregs->ARM_r3; + thread->tp_value[0] = tls; thread->tp_value[1] = get_tpuser(); thread_notify(THREAD_NOTIFY_COPY, thread);
--
2.24.1
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