Commit b05d66c8 authored by Vasily Gorbik's avatar Vasily Gorbik Committed by Alexander Gordeev
Browse files

s390/vmem: Fix null-pointer-arithmetic warning in vmem_map_init() 



Fixes the following clang warning introduced by commit d7bebcb4
("s390: Optimize __pa/__va when RANDOMIZE_IDENTITY_BASE is off")

arch/s390/mm/vmem.c:665:36: warning: performing pointer arithmetic on
a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
  665 |                 __set_memory_4k(__va(0), __va(0) + ident_map_size);
      |                                          ~~~~~~~ ^

Fixes: d7bebcb4 ("s390: Optimize __pa/__va when RANDOMIZE_IDENTITY_BASE is off")
Reported-by: default avatarkernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202501270309.HzsVNo3o-lkp@intel.com/


Reviewed-by: default avatarHeiko Carstens <hca@linux.ibm.com>
Signed-off-by: default avatarVasily Gorbik <gor@linux.ibm.com>
Signed-off-by: default avatarAlexander Gordeev <agordeev@linux.ibm.com>
parent 3b8b80e9

arch/s390/mm/vmem.c

+1 −1
Original line number Diff line number Diff line
@@ -662,7 +662,7 @@ void __init vmem_map_init(void) 
	if (!static_key_enabled(&cpu_has_bear))

		set_memory_x(0, 1);

	if (debug_pagealloc_enabled())

		__set_memory_4k(__va(0), __va(0) + ident_map_size);

		__set_memory_4k(__va(0), absolute_pointer(__va(0)) + ident_map_size);

	pr_info("Write protected kernel read-only data: %luk\n",

		(unsigned long)(__end_rodata - _stext) >> 10);

}