Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 28d170ab authored by Oleg Nesterov's avatar Oleg Nesterov Committed by Benjamin Herrenschmidt
Browse files

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: default avatarOleg Nesterov <oleg@redhat.com>
Acked-by: default avatarMichael Neuling <mikey@neuling.org>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent fcb41a20

arch/powerpc/kernel/process.c

+4 −4
Original line number Diff line number Diff line
@@ -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;