Commit 1e72ba55 authored by Heiko Carstens's avatar Heiko Carstens Committed by Vasily Gorbik
Browse files

s390/mm: Get rid of RELOC_HIDE() 



Since __va(0) does not translate to NULL anymore remove RELOC_HIDE()
which was only added to get rid of a compile warning with clang W=1:

    arch/s390/mm/vmem.c:666:36: warning: performing pointer arithmetic on
     a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
      666 |                 __set_memory_4k(__va(0), __va(0) + ident_map_size);
          |                                          ~~~~~~~ ^

Reviewed-by: default avatarAlexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
Signed-off-by: default avatarVasily Gorbik <gor@linux.ibm.com>
parent 7e12284c

arch/s390/mm/vmem.c

+2 −8
Original line number Diff line number Diff line
@@ -670,14 +670,8 @@ void __init vmem_map_init(void) 
	 */

	if (!static_key_enabled(&cpu_has_bear))

		set_memory_x(0, 1);

	if (debug_pagealloc_enabled()) {

		/*

		 * Use RELOC_HIDE() as long as __va(0) translates to NULL,

		 * since performing pointer arithmetic on a NULL pointer

		 * has undefined behavior and generates compiler warnings.

		 */

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

	}

	if (debug_pagealloc_enabled())

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

	if (MACHINE_HAS_NX)

		system_ctl_set_bit(0, CR0_INSTRUCTION_EXEC_PROTECTION_BIT);

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