From 28d170abad3d6dfbe7309c0097d7de8a51c6b779 Mon Sep 17 00:00:00 2001 From: Oleg Nesterov Date: Sun, 21 Apr 2013 06:47:59 +0000 Subject: [PATCH] ptrace/powerpc: Don't flush_ptrace_hw_breakpoint() on fork() arch_dup_task_struct() does flush_ptrace_hw_breakpoint(src), this destroys the parent's breakpoints for no reason. We should clear child->thread.ptrace_bps[] copied by dup_task_struct() instead. Signed-off-by: Oleg Nesterov Acked-by: Michael Neuling Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/kernel/process.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 59dd545fdde1..834805cf13cb 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -910,10 +910,6 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) flush_altivec_to_thread(src); flush_vsx_to_thread(src); flush_spe_to_thread(src); -#ifdef CONFIG_HAVE_HW_BREAKPOINT - flush_ptrace_hw_breakpoint(src); -#endif /* CONFIG_HAVE_HW_BREAKPOINT */ - *dst = *src; return 0; } @@ -984,6 +980,10 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, p->thread.ksp_limit = (unsigned long)task_stack_page(p) + _ALIGN_UP(sizeof(struct thread_info), 16); +#ifdef CONFIG_HAVE_HW_BREAKPOINT + p->thread.ptrace_bps[0] = NULL; +#endif + #ifdef CONFIG_PPC_STD_MMU_64 if (mmu_has_feature(MMU_FTR_SLB)) { unsigned long sp_vsid; -- 2.39.2