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>
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@ -277,6 +277,8 @@ static inline pte_t pte_mkwrite(pte_t pte)
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static inline pte_t pte_mkspecial(pte_t pte)
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{ return pte; }
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#define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) & ~_PAGE_CA_MASK))
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/*
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* Conversion functions: convert a page and protection to a page entry,
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* and a page entry and page directory to the page they refer to.
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