From fd501d4f0399700011acde486576c7c1eb8e7a61 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Fri, 29 May 2020 23:27:38 +0200 Subject: x86/entry: Remove DBn stacks Both #DB itself, as all other IST users (NMI, #MC) now clear DR7 on entry. Combined with not allowing breakpoints on entry/noinstr/NOKPROBE text and no single step (EFLAGS.TF) inside the #DB handler should guarantee no nested #DB. Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Thomas Gleixner Link: https://lkml.kernel.org/r/20200529213321.303027161@infradead.org --- arch/x86/mm/cpu_entry_area.c | 1 - 1 file changed, 1 deletion(-) (limited to 'arch/x86/mm') diff --git a/arch/x86/mm/cpu_entry_area.c b/arch/x86/mm/cpu_entry_area.c index 6f8b48f545f4..770b613790b3 100644 --- a/arch/x86/mm/cpu_entry_area.c +++ b/arch/x86/mm/cpu_entry_area.c @@ -107,7 +107,6 @@ static void __init percpu_setup_exception_stacks(unsigned int cpu) */ cea_map_stack(DF); cea_map_stack(NMI); - cea_map_stack(DB1); cea_map_stack(DB); cea_map_stack(MCE); } -- cgit