From: Pekka Enberg <penberg@gmail.com>
To: linux-riscv@lists.infradead.org, linux-mm@kvack.org
Cc: Pekka Enberg <penberg@kernel.org>,
Palmer Dabbelt <palmerdabbelt@google.com>,
Mike Rapoport <rppt@linux.ibm.com>,
Tom Lendacky <thomas.lendacky@amd.com>
Subject: [PATCH 1/2] mm: pgtable: Make generic pgprot_* macros available for no-MMU
Date: Tue, 14 Jul 2020 13:00:50 +0300 [thread overview]
Message-ID: <20200714100051.345018-1-penberg@gmail.com> (raw)
From: Pekka Enberg <penberg@kernel.org>
The <linux/pgtable.h> header defines some generic pgprot_*
implementations, but they are only available when CONFIG_MMU is enabled.
The RISC-V architecture, for example, therefore defines some of these
pgprot_* macros for !NOMMU.
Let's make the pgprot_* generic available even for !NOMMU so we can
remove the RISC-V specific definitions.
Compile-tested with x86 defconfig, and riscv defconfig and !MMU defconfig.
Suggested-by: Palmer Dabbelt <palmerdabbelt@google.com>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
---
include/linux/pgtable.h | 69 +++++++++++++++++++++--------------------
1 file changed, 35 insertions(+), 34 deletions(-)
diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index 56c1e8eb7bb0..ed9026ad7c31 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -647,40 +647,6 @@ static inline int arch_unmap_one(struct mm_struct *mm,
#define flush_tlb_fix_spurious_fault(vma, address) flush_tlb_page(vma, address)
#endif
-#ifndef pgprot_nx
-#define pgprot_nx(prot) (prot)
-#endif
-
-#ifndef pgprot_noncached
-#define pgprot_noncached(prot) (prot)
-#endif
-
-#ifndef pgprot_writecombine
-#define pgprot_writecombine pgprot_noncached
-#endif
-
-#ifndef pgprot_writethrough
-#define pgprot_writethrough pgprot_noncached
-#endif
-
-#ifndef pgprot_device
-#define pgprot_device pgprot_noncached
-#endif
-
-#ifndef pgprot_modify
-#define pgprot_modify pgprot_modify
-static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
-{
- if (pgprot_val(oldprot) == pgprot_val(pgprot_noncached(oldprot)))
- newprot = pgprot_noncached(newprot);
- if (pgprot_val(oldprot) == pgprot_val(pgprot_writecombine(oldprot)))
- newprot = pgprot_writecombine(newprot);
- if (pgprot_val(oldprot) == pgprot_val(pgprot_device(oldprot)))
- newprot = pgprot_device(newprot);
- return newprot;
-}
-#endif
-
/*
* When walking page tables, get the address of the next boundary,
* or the end address of the range if that comes earlier. Although no
@@ -840,6 +806,41 @@ static inline void ptep_modify_prot_commit(struct vm_area_struct *vma,
* No-op macros that just return the current protection value. Defined here
* because these macros can be used used even if CONFIG_MMU is not defined.
*/
+
+#ifndef pgprot_nx
+#define pgprot_nx(prot) (prot)
+#endif
+
+#ifndef pgprot_noncached
+#define pgprot_noncached(prot) (prot)
+#endif
+
+#ifndef pgprot_writecombine
+#define pgprot_writecombine pgprot_noncached
+#endif
+
+#ifndef pgprot_writethrough
+#define pgprot_writethrough pgprot_noncached
+#endif
+
+#ifndef pgprot_device
+#define pgprot_device pgprot_noncached
+#endif
+
+#ifndef pgprot_modify
+#define pgprot_modify pgprot_modify
+static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
+{
+ if (pgprot_val(oldprot) == pgprot_val(pgprot_noncached(oldprot)))
+ newprot = pgprot_noncached(newprot);
+ if (pgprot_val(oldprot) == pgprot_val(pgprot_writecombine(oldprot)))
+ newprot = pgprot_writecombine(newprot);
+ if (pgprot_val(oldprot) == pgprot_val(pgprot_device(oldprot)))
+ newprot = pgprot_device(newprot);
+ return newprot;
+}
+#endif
+
#ifndef pgprot_encrypted
#define pgprot_encrypted(prot) (prot)
#endif
--
2.26.2
next reply other threads:[~2020-07-14 10:01 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-14 10:00 Pekka Enberg [this message]
2020-07-14 10:00 ` [PATCH 2/2] riscv: Use generic pgprot_* macros from <linux/pgtable.h> Pekka Enberg
2020-07-14 11:53 ` [PATCH 1/2] mm: pgtable: Make generic pgprot_* macros available for no-MMU Mike Rapoport
2020-07-14 20:42 ` kernel test robot
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