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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2015-01-14 17:51:17 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2015-01-22 12:15:59 +0100 |
| commit | 1f6b83e5e4d3aed46eac1d219322fba9c7341cd8 (patch) | |
| tree | a7839cd769ec8637746d5e20a7eb7117373caaf0 /arch/s390/include/asm/pgtable.h | |
| parent | s390: add z13 code generation support (diff) | |
| download | linux-1f6b83e5e4d3aed46eac1d219322fba9c7341cd8.tar.xz linux-1f6b83e5e4d3aed46eac1d219322fba9c7341cd8.zip | |
s390: avoid z13 cache aliasing
Avoid cache aliasing on z13 by aligning shared objects to multiples
of 512K. The virtual addresses of a page from a shared file needs
to have identical bits in the range 2^12 to 2^18.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/pgtable.h')
| -rw-r--r-- | arch/s390/include/asm/pgtable.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h index 5e102422c9ab..b8641b41e19c 100644 --- a/arch/s390/include/asm/pgtable.h +++ b/arch/s390/include/asm/pgtable.h @@ -1779,6 +1779,10 @@ extern int s390_enable_sie(void); extern int s390_enable_skey(void); extern void s390_reset_cmma(struct mm_struct *mm); +/* s390 has a private copy of get unmapped area to deal with cache synonyms */ +#define HAVE_ARCH_UNMAPPED_AREA +#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN + /* * No page table caches to initialise */ |