From: Reza Arbab <arbab@linux.ibm.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: Charles Johns <crjohns@us.ibm.com>,
Paul Mackerras <paulus@samba.org>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Subject: [PATCH] powerpc/mm: Add _PAGE_SAO to _PAGE_CACHE_CTL mask
Date: Mon, 28 Jan 2019 11:31:42 -0600 [thread overview]
Message-ID: <1548696702-20686-1-git-send-email-arbab@linux.ibm.com> (raw)
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 <crjohns@us.ibm.com>
Signed-off-by: Reza Arbab <arbab@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
next reply other threads:[~2019-01-28 17:54 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-28 17:31 Reza Arbab [this message]
2019-01-29 1:39 ` [PATCH] powerpc/mm: Add _PAGE_SAO to _PAGE_CACHE_CTL mask Alexey Kardashevskiy
2019-01-29 15:07 ` Aneesh Kumar K.V
2019-01-29 17:03 ` Reza Arbab
2019-01-30 13:35 ` Michael Ellerman
2019-02-01 5:02 ` Alexey Kardashevskiy
2019-02-08 13:02 ` Michael Ellerman
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