In htab_convert_pte_flags(), _PAGE_CACHE_CTL is used to check for the _PAGE_SAO flag:
else if ((pteflags & _PAGE_CACHE_CTL) == _PAGE_SAO) rflags |= (HPTE_R_W | HPTE_R_I | HPTE_R_M); But, it isn't defined to include that flag: #define _PAGE_CACHE_CTL (_PAGE_NON_IDEMPOTENT | _PAGE_TOLERANT) This happens to work, but only because of the flag values: #define _PAGE_SAO 0x00010 /* Strong access order */ #define _PAGE_NON_IDEMPOTENT 0x00020 /* non idempotent memory */ #define _PAGE_TOLERANT 0x00030 /* tolerant memory, cache inhibited */ To prevent any issues if these particulars ever change, add _PAGE_SAO to the mask. Suggested-by: Charles Johns <crjo...@us.ibm.com> Signed-off-by: Reza Arbab <ar...@linux.ibm.com> --- arch/powerpc/include/asm/book3s/64/pgtable.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h index 2e6ada2..1d97a28 100644 --- a/arch/powerpc/include/asm/book3s/64/pgtable.h +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h @@ -811,7 +811,7 @@ static inline void __set_pte_at(struct mm_struct *mm, unsigned long addr, return hash__set_pte_at(mm, addr, ptep, pte, percpu); } -#define _PAGE_CACHE_CTL (_PAGE_NON_IDEMPOTENT | _PAGE_TOLERANT) +#define _PAGE_CACHE_CTL (_PAGE_SAO | _PAGE_NON_IDEMPOTENT | _PAGE_TOLERANT) #define pgprot_noncached pgprot_noncached static inline pgprot_t pgprot_noncached(pgprot_t prot) -- 1.8.3.1