We never use this code-path with KAISER enabled. Fixes: ("Prepare the x86/entry assembly code for entry/exit CR3 switching") Signed-off-by: Peter Zijlstra (Intel) --- arch/x86/entry/entry_64.S | 8 -------- 1 file changed, 8 deletions(-) --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -201,14 +201,6 @@ ENTRY(entry_SYSCALL_64) swapgs movq %rsp, PER_CPU_VAR(rsp_scratch) - - /* - * The kernel CR3 is needed to map the process stack, but we - * need a scratch register to be able to load CR3. %rsp is - * clobberable right now, so use it as a scratch register. - * %rsp will look crazy here for a couple instructions. - */ - SWITCH_TO_KERNEL_CR3 scratch_reg=%rsp movq PER_CPU_VAR(cpu_current_top_of_stack), %rsp /* Construct struct pt_regs on stack */