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s390/mm: Get rid of RELOC_HIDE()

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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>
This commit is contained in:
Heiko Carstens 2024-07-29 15:45:58 +02:00 committed by Vasily Gorbik
parent 7e12284c52
commit 1e72ba5566
1 changed files with 2 additions and 8 deletions
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10
arch/s390/mm/vmem.c
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@ -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",