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s390/mm: align swapper_pg_dir to 16k 

The segment/region table that is part of the kernel image must be
properly aligned to 16k in order to make the crdte inline assembly
work.
Otherwise it will calculate a wrong segment/region table start address
and access incorrect memory locations if the swapper_pg_dir is not
aligned to 16k.

Therefore define BSS_FIRST_SECTIONS in order to put the swapper_pg_dir
at the beginning of the bss section and also align the bss section to
16k just like other architectures did.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2016-05-28 10:03:55 +02:00 committed by Martin Schwidefsky
parent 4b8fe77ace
commit 0ccb32c983
3 changed files with 10 additions and 3 deletions
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2
arch/s390/include/asm/pgtable.h
View File

@ -32,7 +32,7 @@
#include <asm/bug.h>
#include <asm/page.h>
extern pgd_t swapper_pg_dir[] __attribute__ ((aligned (4096)));
extern pgd_t swapper_pg_dir[];
extern void paging_init(void);
extern void vmem_map_init(void);
pmd_t *vmem_pmd_alloc(void);

9
arch/s390/kernel/vmlinux.lds.S
View File

@ -4,6 +4,13 @@
#include <asm/thread_info.h>
#include <asm/page.h>
/*
* Put .bss..swapper_pg_dir as the first thing in .bss. This will
* make sure it has 16k alignment.
*/
#define BSS_FIRST_SECTIONS *(.bss..swapper_pg_dir)
#include <asm-generic/vmlinux.lds.h>
OUTPUT_FORMAT("elf64-s390", "elf64-s390", "elf64-s390")
@ -81,7 +88,7 @@ SECTIONS
. = ALIGN(PAGE_SIZE);
__init_end = .; /* freed after init ends here */
BSS_SECTION(0, 2, 0)
BSS_SECTION(PAGE_SIZE, 4 * PAGE_SIZE, PAGE_SIZE)
_end = . ;

2
arch/s390/mm/init.c
View File

@ -40,7 +40,7 @@
#include <asm/ctl_reg.h>
#include <asm/sclp.h>
pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE)));
pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(.bss..swapper_pg_dir);
unsigned long empty_zero_page, zero_page_mask;
EXPORT_SYMBOL(empty_zero_page);