diff options
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/mm/vmem.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c index 9b31dc565bc5..a1e01542790b 100644 --- a/arch/s390/mm/vmem.c +++ b/arch/s390/mm/vmem.c @@ -659,8 +659,11 @@ void __init vmem_map_init(void) (unsigned long)(_einittext - _sinittext) >> PAGE_SHIFT); set_memory_rox((unsigned long)__stext_amode31, (unsigned long)(__etext_amode31 - __stext_amode31) >> PAGE_SHIFT); - - /* lowcore must be executable for LPSWE */ + /* + * If the BEAR-enhancement facility is not installed the first + * prefix page is used to return to the previous context with + * an LPSWE instruction and therefore must be executable. + */ if (!static_key_enabled(&cpu_has_bear)) set_memory_x(0, 1); if (debug_pagealloc_enabled()) { |