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s390: avoid z13 cache aliasing

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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>
This commit is contained in:
Martin Schwidefsky
2015-01-14 17:51:17 +01:00
parent f8b2dcbd9e
commit 1f6b83e5e4
5 changed files with 155 additions and 18 deletions
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8
arch/s390/include/asm/elf.h
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@@ -163,8 +163,8 @@ extern unsigned int vdso_enabled;
the loader. We need to make sure that it is out of the way of the program
that it will "exec", and that there is sufficient room for the brk. */
extern unsigned long randomize_et_dyn(unsigned long base);
#define ELF_ET_DYN_BASE (randomize_et_dyn(STACK_TOP / 3 * 2))
extern unsigned long randomize_et_dyn(void);
#define ELF_ET_DYN_BASE randomize_et_dyn()
/* This yields a mask that user programs can use to figure out what
instruction set this CPU supports. */
@@ -209,7 +209,9 @@ do { \
} while (0)
#endif /* CONFIG_COMPAT */
#define STACK_RND_MASK 0x7ffUL
extern unsigned long mmap_rnd_mask;
#define STACK_RND_MASK (mmap_rnd_mask)
#define ARCH_DLINFO \
do { \