* [PATCH] xtensa: fix pgprot_noncached assumptions
@ 2021-03-15 3:21 Max Filippov
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From: Max Filippov @ 2021-03-15 3:21 UTC (permalink / raw)
To: linux-xtensa; +Cc: Chris Zankel, linux-kernel, Max Filippov
pgprot_noncached assumes that cache bypass attribute is represented as
zero. This may not always be true. Fix pgprot_noncached definition by
adding _PAGE_CA_BYPASS to the result.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
---
arch/xtensa/include/asm/pgtable.h | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/xtensa/include/asm/pgtable.h b/arch/xtensa/include/asm/pgtable.h
index 4dc04e6c01d7..d7fc45c920c2 100644
--- a/arch/xtensa/include/asm/pgtable.h
+++ b/arch/xtensa/include/asm/pgtable.h
@@ -280,7 +280,9 @@ static inline pte_t pte_mkyoung(pte_t pte)
static inline pte_t pte_mkwrite(pte_t pte)
{ pte_val(pte) |= _PAGE_WRITABLE; return pte; }
-#define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) & ~_PAGE_CA_MASK))
+#define pgprot_noncached(prot) \
+ ((__pgprot((pgprot_val(prot) & ~_PAGE_CA_MASK) | \
+ _PAGE_CA_BYPASS)))
/*
* Conversion functions: convert a page and protection to a page entry,
--
2.20.1
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