diff options
| -rw-r--r-- | arch/s390/include/asm/cache.h | 3 | ||||
| -rw-r--r-- | arch/s390/include/asm/sections.h | 1 | ||||
| -rw-r--r-- | arch/s390/kernel/vmlinux.lds.S | 12 | ||||
| -rw-r--r-- | arch/s390/mm/init.c | 7 | ||||
| -rw-r--r-- | arch/s390/mm/vmem.c | 7 |
5 files changed, 19 insertions, 11 deletions
diff --git a/arch/s390/include/asm/cache.h b/arch/s390/include/asm/cache.h index 22da3b3..4d7ccac 100644 --- a/arch/s390/include/asm/cache.h +++ b/arch/s390/include/asm/cache.h @@ -15,7 +15,4 @@ #define __read_mostly __attribute__((__section__(".data..read_mostly"))) -/* Read-only memory is marked before mark_rodata_ro() is called. */ -#define __ro_after_init __read_mostly - #endif diff --git a/arch/s390/include/asm/sections.h b/arch/s390/include/asm/sections.h index fbd9116..5ce29fe 100644 --- a/arch/s390/include/asm/sections.h +++ b/arch/s390/include/asm/sections.h @@ -4,5 +4,6 @@ #include <asm-generic/sections.h> extern char _eshared[], _ehead[]; +extern char __start_ro_after_init[], __end_ro_after_init[]; #endif diff --git a/arch/s390/kernel/vmlinux.lds.S b/arch/s390/kernel/vmlinux.lds.S index 0656f7c..429bfd1 100644 --- a/arch/s390/kernel/vmlinux.lds.S +++ b/arch/s390/kernel/vmlinux.lds.S @@ -11,6 +11,9 @@ */ #define BSS_FIRST_SECTIONS *(.bss..swapper_pg_dir) +/* Handle ro_after_init data on our own. */ +#define RO_AFTER_INIT_DATA + #include <asm-generic/vmlinux.lds.h> OUTPUT_FORMAT("elf64-s390", "elf64-s390", "elf64-s390") @@ -56,7 +59,14 @@ SECTIONS _eshared = .; /* End of shareable data */ _sdata = .; /* Start of data section */ - EXCEPTION_TABLE(16) :data + . = ALIGN(PAGE_SIZE); + __start_ro_after_init = .; + .data..ro_after_init : { + *(.data..ro_after_init) + } + EXCEPTION_TABLE(16) + . = ALIGN(PAGE_SIZE); + __end_ro_after_init = .; RW_DATA_SECTION(0x100, PAGE_SIZE, THREAD_SIZE) diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c index de2cdf4..f56a39b 100644 --- a/arch/s390/mm/init.c +++ b/arch/s390/mm/init.c @@ -111,9 +111,10 @@ void __init paging_init(void) void mark_rodata_ro(void) { - /* Text and rodata are already protected. Nothing to do here. */ - pr_info("Write protecting the kernel read-only data: %luk\n", - ((unsigned long)&_eshared - (unsigned long)&_stext) >> 10); + unsigned long size = __end_ro_after_init - __start_ro_after_init; + + set_memory_ro((unsigned long)__start_ro_after_init, size >> PAGE_SHIFT); + pr_info("Write protected read-only-after-init data: %luk\n", size >> 10); } void __init mem_init(void) diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c index a1e7c0b..1848292 100644 --- a/arch/s390/mm/vmem.c +++ b/arch/s390/mm/vmem.c @@ -373,14 +373,13 @@ out: */ void __init vmem_map_init(void) { - unsigned long ro_start, ro_end; + unsigned long size = _eshared - _stext; struct memblock_region *reg; for_each_memblock(memory, reg) vmem_add_mem(reg->base, reg->size); - ro_start = PFN_ALIGN((unsigned long)&_stext); - ro_end = (unsigned long)&_eshared & PAGE_MASK; - set_memory_ro(ro_start, (ro_end - ro_start) >> PAGE_SHIFT); + set_memory_ro((unsigned long)_stext, size >> PAGE_SHIFT); + pr_info("Write protected kernel read-only data: %luk\n", size >> 10); } /* |