On Mon, May 09, 2022 at 08:20:41AM +0200, Sven Schnelle wrote: > 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()." Sure, thanks!
