Messages in this thread Patch in this message | | | Date | Sun, 21 Apr 2013 18:47:59 +0200 | From | Oleg Nesterov <> | Subject | [PATCH] ptrace/powerpc: dont flush_ptrace_hw_breakpoint() on fork() |
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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 <oleg@redhat.com> Acked-by: Michael Neuling <mikey@neuling.org>
--- x/arch/powerpc/kernel/process.c +++ x/arch/powerpc/kernel/process.c @@ -910,10 +910,6 @@ int arch_dup_task_struct(struct task_str 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_flag 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;
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