diff options
Diffstat (limited to 'arch/arm64/kernel/process.c')
| -rw-r--r-- | arch/arm64/kernel/process.c | 62 |
1 files changed, 23 insertions, 39 deletions
diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c index c6b1f3b96..223b093c9 100644 --- a/arch/arm64/kernel/process.c +++ b/arch/arm64/kernel/process.c @@ -58,14 +58,6 @@ unsigned long __stack_chk_guard __read_mostly; EXPORT_SYMBOL(__stack_chk_guard); #endif -void soft_restart(unsigned long addr) -{ - setup_mm_for_reboot(); - cpu_soft_restart(virt_to_phys(cpu_reset), addr); - /* Should never get here */ - BUG(); -} - /* * Function pointers to optional machine specific functions */ @@ -136,9 +128,7 @@ void machine_power_off(void) /* * Restart requires that the secondary CPUs stop performing any activity - * while the primary CPU resets the system. Systems with a single CPU can - * use soft_restart() as their machine descriptor's .restart hook, since that - * will cause the only available CPU to reset. Systems with multiple CPUs must + * while the primary CPU resets the system. Systems with multiple CPUs must * provide a HW restart implementation, to ensure that all CPUs reset at once. * This is required so that any code running after reset on the primary CPU * doesn't have to co-ordinate with other CPUs to ensure they aren't still @@ -243,7 +233,8 @@ void release_thread(struct task_struct *dead_task) int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) { - fpsimd_preserve_current_state(); + if (current->mm) + fpsimd_preserve_current_state(); *dst = *src; return 0; } @@ -254,35 +245,35 @@ int copy_thread(unsigned long clone_flags, unsigned long stack_start, unsigned long stk_sz, struct task_struct *p) { struct pt_regs *childregs = task_pt_regs(p); - unsigned long tls = p->thread.tp_value; memset(&p->thread.cpu_context, 0, sizeof(struct cpu_context)); if (likely(!(p->flags & PF_KTHREAD))) { *childregs = *current_pt_regs(); childregs->regs[0] = 0; - if (is_compat_thread(task_thread_info(p))) { - if (stack_start) + + /* + * Read the current TLS pointer from tpidr_el0 as it may be + * out-of-sync with the saved value. + */ + asm("mrs %0, tpidr_el0" : "=r" (*task_user_tls(p))); + + if (stack_start) { + if (is_compat_thread(task_thread_info(p))) childregs->compat_sp = stack_start; - } else { - /* - * Read the current TLS pointer from tpidr_el0 as it may be - * out-of-sync with the saved value. - */ - asm("mrs %0, tpidr_el0" : "=r" (tls)); - if (stack_start) { - /* 16-byte aligned stack mandatory on AArch64 */ - if (stack_start & 15) - return -EINVAL; + /* 16-byte aligned stack mandatory on AArch64 */ + else if (stack_start & 15) + return -EINVAL; + else childregs->sp = stack_start; - } } + /* * If a TLS pointer was passed to clone (4th argument), use it * for the new thread. */ if (clone_flags & CLONE_SETTLS) - tls = childregs->regs[3]; + p->thread.tp_value = childregs->regs[3]; } else { memset(childregs, 0, sizeof(struct pt_regs)); childregs->pstate = PSR_MODE_EL1h; @@ -291,7 +282,6 @@ int copy_thread(unsigned long clone_flags, unsigned long stack_start, } p->thread.cpu_context.pc = (unsigned long)ret_from_fork; p->thread.cpu_context.sp = (unsigned long)childregs; - p->thread.tp_value = tls; ptrace_hw_copy_thread(p); @@ -302,18 +292,12 @@ static void tls_thread_switch(struct task_struct *next) { unsigned long tpidr, tpidrro; - if (!is_compat_task()) { - asm("mrs %0, tpidr_el0" : "=r" (tpidr)); - current->thread.tp_value = tpidr; - } + asm("mrs %0, tpidr_el0" : "=r" (tpidr)); + *task_user_tls(current) = tpidr; - if (is_compat_thread(task_thread_info(next))) { - tpidr = 0; - tpidrro = next->thread.tp_value; - } else { - tpidr = next->thread.tp_value; - tpidrro = 0; - } + tpidr = *task_user_tls(next); + tpidrro = is_compat_thread(task_thread_info(next)) ? + next->thread.tp_value : 0; asm( " msr tpidr_el0, %0\n" |