On 9/7/26 04:46, Jinjie Ruan wrote:

On 7/8/2026 3:06 AM, Thomas Gleixner wrote:

quoted

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 <tglx@kernel.org>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: linux-s390@vger.kernel.org
---
  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.

Reviewed-by: Philippe Mathieu-Daudé <redacted>