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: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index 41c714e212927b12dad4aceba5c73b49169531e3..4edb39e2adb7ad860cf62ec0729a976d75f6b603 100644 (file)
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -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",