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xtensa: implement pgprot_noncached 

The default pgprot_noncached doesn't do anything. This leads to issues
when drivers rely on it to disable caching in userspace mappings.
Implement pgprot_noncached properly so that caching of userspace mappings
could be controlled.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov 2014-09-10 21:05:21 -07:00
parent bfe01a5ba2
commit a211276a8e
1 changed files with 2 additions and 0 deletions
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2
arch/xtensa/include/asm/pgtable.h
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@ -277,6 +277,8 @@ static inline pte_t pte_mkwrite(pte_t pte)
static inline pte_t pte_mkspecial(pte_t pte)
{ return pte; }
#define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) & ~_PAGE_CA_MASK))
/*
* Conversion functions: convert a page and protection to a page entry,
* and a page entry and page directory to the page they refer to.