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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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10
arch/s390/kernel/process.c
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@@ -243,13 +243,3 @@ unsigned long arch_randomize_brk(struct mm_struct *mm)
ret = PAGE_ALIGN(mm->brk + brk_rnd());
return (ret > mm->brk) ? ret : mm->brk;
}
unsigned long randomize_et_dyn(unsigned long base)
{
unsigned long ret;
if (!(current->flags & PF_RANDOMIZE))
return base;
ret = PAGE_ALIGN(base + brk_rnd());
return (ret > base) ? ret : base;
}