Messages in this thread |  | | Date | Wed, 22 Oct 2014 12:22:23 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH 2/4] mm: introduce mm_forbids_zeropage function |
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On Wed, 22 Oct 2014 13:09:28 +0200 Dominik Dingel <dingel@linux.vnet.ibm.com> wrote:
> Add a new function stub to allow architectures to disable for > an mm_structthe backing of non-present, anonymous pages with > read-only empty zero pages. > > ... > > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -56,6 +56,10 @@ extern int sysctl_legacy_va_layout; > #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) > #endif > > +#ifndef mm_forbids_zeropage > +#define mm_forbids_zeropage(X) (0) > +#endif
Can we document this please? What it does, why it does it. We should also specify precisely which arch header file is responsible for defining mm_forbids_zeropage.
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