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s390/mm: align swapper_pg_dir to 16k

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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
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@@ -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);