From: Christophe Leroy <christophe.leroy@c-s.fr>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
aneesh.kumar@linux.ibm.com
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: [PATCH] powerpc/book3e: redefine pte_mkprivileged() and pte_mkuser()
Date: Wed, 17 Oct 2018 13:03:22 +0000 (UTC) [thread overview]
Message-ID: <19885260cc71182f8c03840204e2553ef42acb67.1539781367.git.christophe.leroy@c-s.fr> (raw)
Book3e defines both _PAGE_USER and _PAGE_PRIVILEGED, so the nohash
default pte_mkprivileged() and pte_mkuser() are not usable.
This patch redefines them for book3e.
In theorie, only pte_mkprivileged() needs to be redefined because
_PAGE_USER includes _PAGE_PRIVILEGED, but it is less confusing
to redefine both.
Fixes: a0da4bc166f2 ("powerpc/mm: Allow platforms to redefine some helpers")
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/include/asm/nohash/pte-book3e.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/arch/powerpc/include/asm/nohash/pte-book3e.h b/arch/powerpc/include/asm/nohash/pte-book3e.h
index 58eef8cb569d..fa1451e15b4e 100644
--- a/arch/powerpc/include/asm/nohash/pte-book3e.h
+++ b/arch/powerpc/include/asm/nohash/pte-book3e.h
@@ -109,5 +109,21 @@
#define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_USER)
#define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
+#ifndef __ASSEMBLY__
+static inline pte_t pte_mkprivileged(pte_t pte)
+{
+ return __pte((pte_val(pte) & ~_PAGE_USER) | _PAGE_PRIVILEGED);
+}
+
+#define pte_mkprivileged pte_mkprivileged
+
+static inline pte_t pte_mkuser(pte_t pte)
+{
+ return __pte((pte_val(pte) & ~_PAGE_PRIVILEGED) | _PAGE_USER);
+}
+
+#define pte_mkuser pte_mkuser
+#endif /* __ASSEMBLY__ */
+
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_NOHASH_PTE_BOOK3E_H */
--
2.13.3
next reply other threads:[~2018-10-17 13:07 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-17 13:03 Christophe Leroy [this message]
2018-10-17 13:23 ` [PATCH] powerpc/book3e: redefine pte_mkprivileged() and pte_mkuser() Aneesh Kumar K.V
2018-10-19 2:51 ` Michael Ellerman
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