Re: [patch 07/18] s390/syscall: Use enter_from_user_mode_randomize_stack()
Jinjie Ruan <[email protected]>
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On 7/8/2026 3:06 AM, Thomas Gleixner wrote: > enter_from_user_mode_randomize_stack() replaces enter_from_user_mode() and > the subsequent invocation of add_random_kstack_offset_irqsoff(). > > As a bonus this avoids the overhead of get/put_cpu_var() in > add_random_kstack_offset(). > > No functional change. > > Signed-off-by: Thomas Gleixner <[email protected]> > Cc: Sven Schnelle <[email protected]> > Cc: [email protected] > --- > arch/s390/kernel/syscall.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > --- a/arch/s390/kernel/syscall.c > +++ b/arch/s390/kernel/syscall.c > @@ -97,8 +97,8 @@ void noinstr __do_syscall(struct pt_regs > { > unsigned long nr; > > - enter_from_user_mode(regs); > - add_random_kstack_offset(); > + enter_from_user_mode_randomize_stack(regs); The #include <linux/randomize_kstack.h> can be removed. > + > regs->psw = get_lowcore()->svc_old_psw; > regs->int_code = get_lowcore()->svc_int_code; > update_timer_sys(); >