mm: always define pxx_pgprot()

jira LE-3557
Rebuild_History Non-Buildable kernel-5.14.0-570.26.1.el9_6
commit-author Peter Xu <[email protected]>
commit 0515e02

There're:

  - 8 archs (arc, arm64, include, mips, powerpc, s390, sh, x86) that
  support pte_pgprot().

  - 2 archs (x86, sparc) that support pmd_pgprot().

  - 1 arch (x86) that support pud_pgprot().

Always define them to be used in generic code, and then we don't need to
fiddle with "#ifdef"s when doing so.

Link: https://lkml.kernel.org/r/[email protected]
	Signed-off-by: Peter Xu <[email protected]>
	Reviewed-by: Jason Gunthorpe <[email protected]>
	Cc: Alexander Gordeev <[email protected]>
	Cc: Alex Williamson <[email protected]>
	Cc: Aneesh Kumar K.V <[email protected]>
	Cc: Borislav Petkov <[email protected]>
	Cc: Catalin Marinas <[email protected]>
	Cc: Christian Borntraeger <[email protected]>
	Cc: Dave Hansen <[email protected]>
	Cc: David Hildenbrand <[email protected]>
	Cc: Gavin Shan <[email protected]>
	Cc: Gerald Schaefer <[email protected]>
	Cc: Heiko Carstens <[email protected]>
	Cc: Ingo Molnar <[email protected]>
	Cc: Matthew Wilcox <[email protected]>
	Cc: Niklas Schnelle <[email protected]>
	Cc: Paolo Bonzini <[email protected]>
	Cc: Ryan Roberts <[email protected]>
	Cc: Sean Christopherson <[email protected]>
	Cc: Sven Schnelle <[email protected]>
	Cc: Thomas Gleixner <[email protected]>
	Cc: Vasily Gorbik <[email protected]>
	Cc: Will Deacon <[email protected]>
	Cc: Zi Yan <[email protected]>
	Signed-off-by: Andrew Morton <[email protected]>
(cherry picked from commit 0515e02)
	Signed-off-by: Jonathan Maple <[email protected]>

Author: PlaidCat

arch/arm64/include/asm/pgtable.h

@@ -354,6 +354,7 @@ static inline void __sync_cache_and_tags(pte_t pte, unsigned int nr_pages)
 /*
  * Select all bits except the pfn
  */
+#define pte_pgprot pte_pgprot
 static inline pgprot_t pte_pgprot(pte_t pte)
 {
 	unsigned long pfn = pte_pfn(pte);

arch/powerpc/include/asm/pgtable.h

@@ -44,6 +44,7 @@ static inline unsigned long pte_pfn(pte_t pte)
 /*
  * Select all bits except the pfn
  */
+#define pte_pgprot pte_pgprot
 static inline pgprot_t pte_pgprot(pte_t pte)
 {
 	unsigned long pte_flags;

arch/s390/include/asm/pgtable.h

@@ -941,6 +941,7 @@ static inline int pte_unused(pte_t pte)
  * young/old accounting is not supported, i.e _PAGE_PROTECT and _PAGE_INVALID
  * must not be set.
  */
+#define pte_pgprot pte_pgprot
 static inline pgprot_t pte_pgprot(pte_t pte)
 {
 	unsigned long pte_flags = pte_val(pte) & _PAGE_CHG_MASK;

arch/sparc/include/asm/pgtable_64.h

@@ -782,6 +782,7 @@ static inline pmd_t pmd_mkwrite_novma(pmd_t pmd)
 	return __pmd(pte_val(pte));
 }
 
+#define pmd_pgprot pmd_pgprot
 static inline pgprot_t pmd_pgprot(pmd_t entry)
 {
 	unsigned long val = pmd_val(entry);

include/linux/pgtable.h

@@ -1685,6 +1685,18 @@ typedef unsigned int pgtbl_mod_mask;
 #define MAX_PTRS_PER_P4D PTRS_PER_P4D
 #endif
 
+#ifndef pte_pgprot
+#define pte_pgprot(x) ((pgprot_t) {0})
+#endif
+
+#ifndef pmd_pgprot
+#define pmd_pgprot(x) ((pgprot_t) {0})
+#endif
+
+#ifndef pud_pgprot
+#define pud_pgprot(x) ((pgprot_t) {0})
+#endif
+
 /* description of effects of mapping type and prot in current implementation.
  * this is due to the limited x86 page protection hardware.  The expected
  * behavior is in parens: