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* [merged] mm-pgtable-make-generic-pgprot_-macros-available-for-no-mmu.patch removed from -mm tree
@ 2020-07-23 23:23 akpm
  0 siblings, 0 replies; only message in thread
From: akpm @ 2020-07-23 23:23 UTC (permalink / raw)
  To: mm-commits, palmerdabbelt, penberg, rientjes, rppt, thomas.lendacky


The patch titled
     Subject: mm: pgtable: make generic pgprot_* macros available for no-MMU
has been removed from the -mm tree.  Its filename was
     mm-pgtable-make-generic-pgprot_-macros-available-for-no-mmu.patch

This patch was dropped because it was merged into mainline or a subsystem tree

------------------------------------------------------
From: Pekka Enberg <penberg@kernel.org>
Subject: mm: pgtable: make generic pgprot_* macros available for no-MMU

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.

Link: http://lkml.kernel.org/r/20200715053340.576300-1-penberg@gmail.com
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Suggested-by: Palmer Dabbelt <palmerdabbelt@google.com>
Reviewed-by: Mike Rapoport <rppt@linux.ibm.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/pgtable.h |   71 +++++++++++++++++++-------------------
 1 file changed, 37 insertions(+), 34 deletions(-)

--- a/include/linux/pgtable.h~mm-pgtable-make-generic-pgprot_-macros-available-for-no-mmu
+++ a/include/linux/pgtable.h
@@ -675,40 +675,6 @@ static inline void arch_swap_restore(swp
 #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
@@ -868,6 +834,43 @@ static inline void ptep_modify_prot_comm
  * No-op macros that just return the current protection value. Defined here
  * because these macros can be 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
+
+#ifdef CONFIG_MMU
+#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
+#endif /* CONFIG_MMU */
+
 #ifndef pgprot_encrypted
 #define pgprot_encrypted(prot)	(prot)
 #endif
_

Patches currently in -mm which might be from penberg@kernel.org are



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2020-07-23 23:23 [merged] mm-pgtable-make-generic-pgprot_-macros-available-for-no-mmu.patch removed from -mm tree akpm

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