Peter Zijlstra <peterz@xxxxxxxxxxxxx> writes: > On Wed, May 04, 2022 at 08:23:50AM +0200, Thomas Richter wrote: >> From: Sven Schnelle <svens@xxxxxxxxxxxxx> >> >> arch_check_user_regs() is used at the moment to verify that struct pt_regs >> contains valid values when entering the kernel from userspace. s390 needs >> a place in the generic entry code to modify a cpu data structure when >> switching from userspace to kernel mode. As arch_check_user_regs() is >> exactly this, rename it to arch_enter_from_user_mode(). >> >> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> >> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> >> Cc: Andy Lutomirski <luto@xxxxxxxxxx> >> Signed-off-by: Sven Schnelle <svens@xxxxxxxxxxxxx> >> --- > > With the note that NMI doesn't (necessarily) call this.. > > Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> How about: "When entering the kernel from userspace, arch_check_user_regs() is used to verify that struct pt_regs contains valid values. Note that the NMI codepath doesn't call this function. s390 needs a place in the generic entry code to modify a cpu data structure when switching from userspace to kernel mode. As arch_check_user_regs() is exactly this, rename it to arch_enter_from_user_mode()."
