parisc: constify mmap_upper_limit() parameter

For improved const-correctness.

This piece is necessary to make the `rlim_stack` parameter to mmap_base()
const.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Max Kellermann <[e-mail]>
Reviewed-by: Vishal Moola (Oracle) <[e-mail]>
Reviewed-by: Lorenzo Stoakes <[e-mail]>
Acked-by: David Hildenbrand <[e-mail]>
Acked-by: Vlastimil Babka <[e-mail]>
Acked-by: Mike Rapoport (Microsoft) <[e-mail]>
Acked-by: Shakeel Butt <[e-mail]>
Cc: Alexander Gordeev <[e-mail]>
Cc: Al Viro <[e-mail]>
Cc: Andreas Larsson <[e-mail]>
Cc: Andy Lutomirski <[e-mail]>
Cc: Axel Rasmussen <[e-mail]>
Cc: Baolin Wang <[e-mail]>
Cc: Borislav Betkov <[e-mail]>
Cc: Christian Borntraeger <[e-mail]>
Cc: Christian Brauner <[e-mail]>
Cc: Christian Zankel <[e-mail]>
Cc: David Rientjes <[e-mail]>
Cc: David S. Miller <[e-mail]>
Cc: Gerald Schaefer <[e-mail]>
Cc: Heiko Carstens <[e-mail]>
Cc: Helge Deller <[e-mail]>
Cc: "H. Peter Anvin" <[e-mail]>
Cc: Hugh Dickins <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: James Bottomley <[e-mail]>
Cc: Jan Kara <[e-mail]>
Cc: Jocelyn Falempe <[e-mail]>
Cc: Liam Howlett <[e-mail]>
Cc: Mark Brown <[e-mail]>
Cc: Matthew Wilcox (Oracle) <[e-mail]>
Cc: Max Filippov <[e-mail]>
Cc: Michael Ellerman <[e-mail]>
Cc: Michal Hocko <[e-mail]>
Cc: "Nysal Jan K.A" <[e-mail]>
Cc: Oscar Salvador <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Russel King <[e-mail]>
Cc: Suren Baghdasaryan <[e-mail]>
Cc: Sven Schnelle <[e-mail]>
Cc: Thomas Gleinxer <[e-mail]>
Cc: Thomas Huth <[e-mail]>
Cc: Vasily Gorbik <[e-mail]>
Cc: Wei Xu <[e-mail]>
Cc: Yuanchu Xie <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

arch/parisc/include/asm/processor.h

···
 #ifndef __ASSEMBLER__
 
 struct rlimit;
-unsigned long mmap_upper_limit(struct rlimit *rlim_stack);
+unsigned long mmap_upper_limit(const struct rlimit *rlim_stack);
 unsigned long calc_max_stack_size(unsigned long stack_max);
 
 /*

arch/parisc/kernel/sys_parisc.c

···
  * indicating that "current" should be used instead of a passed-in
  * value from the exec bprm as done with arch_pick_mmap_layout().
  */
-unsigned long mmap_upper_limit(struct rlimit *rlim_stack)
+unsigned long mmap_upper_limit(const struct rlimit *rlim_stack)
 {
 	unsigned long stack_base;