[PATCH 0/2] arch: Virt to phys to static inlines

[PATCH 0/2] arch: Virt to phys to static inlines

[Linus Walleij]

Some architectures have been given patches to switch their
virt_to_phys()/phys_to_virt() or underlying *pfn etc functions
over to static inlines.

Some patches have been ignored or have no maintained arch
tree.

This set includes patches that I suggest to simply be applied
to the arch tree so they get in.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
Linus Walleij (2):
      ARC: mm: Make virt_to_pfn() a static inline
      Hexagon: Make pfn accessors statics inlines

 arch/arc/include/asm/page.h           | 21 ++++++++++++---------
 arch/arc/include/asm/pgtable-levels.h |  2 +-
 arch/hexagon/include/asm/page.h       | 15 +++++++++++++--
 3 files changed, 26 insertions(+), 12 deletions(-)
---
base-commit: b85ea95d086471afb4ad062012a4d73cd328fa86
change-id: 20231115-virt-to-phy-arch-tree-137bc87046e1

Best regards,
-- 
Linus Walleij <linus.walleij@linaro.org>

[PATCH 1/2] ARC: mm: Make virt_to_pfn() a static inline

[Linus Walleij]

Making virt_to_pfn() a static inline taking a strongly typed
(const void *) makes the contract of a passing a pointer of that
type to the function explicit and exposes any misuse of the
macro virt_to_pfn() acting polymorphic and accepting many types
such as (void *), (unitptr_t) or (unsigned long) as arguments
without warnings.

In order to do this we move the virt_to_phys() and
below the definition of the __pa() and __va() macros so it
compiles. The macro version was also able to do recursive
symbol resolution.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 arch/arc/include/asm/page.h           | 21 ++++++++++++---------
 arch/arc/include/asm/pgtable-levels.h |  2 +-
 2 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/arch/arc/include/asm/page.h b/arch/arc/include/asm/page.h
index 02b53ad811fb..def0dfb95b43 100644
--- a/arch/arc/include/asm/page.h
+++ b/arch/arc/include/asm/page.h
@@ -84,15 +84,6 @@ typedef struct {
 
 typedef struct page *pgtable_t;
 
-/*
- * Use virt_to_pfn with caution:
- * If used in pte or paddr related macros, it could cause truncation
- * in PAE40 builds
- * As a rule of thumb, only use it in helpers starting with virt_
- * You have been warned !
- */
-#define virt_to_pfn(kaddr)	(__pa(kaddr) >> PAGE_SHIFT)
-
 /*
  * When HIGHMEM is enabled we have holes in the memory map so we need
  * pfn_valid() that takes into account the actual extents of the physical
@@ -122,6 +113,18 @@ extern int pfn_valid(unsigned long pfn);
 #define __pa(vaddr)  		((unsigned long)(vaddr))
 #define __va(paddr)  		((void *)((unsigned long)(paddr)))
 
+/*
+ * Use virt_to_pfn with caution:
+ * If used in pte or paddr related macros, it could cause truncation
+ * in PAE40 builds
+ * As a rule of thumb, only use it in helpers starting with virt_
+ * You have been warned !
+ */
+static inline unsigned long virt_to_pfn(const void *kaddr)
+{
+	return __pa(kaddr) >> PAGE_SHIFT;
+}
+
 #define virt_to_page(kaddr)	pfn_to_page(virt_to_pfn(kaddr))
 #define virt_addr_valid(kaddr)  pfn_valid(virt_to_pfn(kaddr))
 
diff --git a/arch/arc/include/asm/pgtable-levels.h b/arch/arc/include/asm/pgtable-levels.h
index fc417c75c24d..86e148226463 100644
--- a/arch/arc/include/asm/pgtable-levels.h
+++ b/arch/arc/include/asm/pgtable-levels.h
@@ -159,7 +159,7 @@
 #define pmd_clear(xp)		do { pmd_val(*(xp)) = 0; } while (0)
 #define pmd_page_vaddr(pmd)	(pmd_val(pmd) & PAGE_MASK)
 #define pmd_pfn(pmd)		((pmd_val(pmd) & PAGE_MASK) >> PAGE_SHIFT)
-#define pmd_page(pmd)		virt_to_page(pmd_page_vaddr(pmd))
+#define pmd_page(pmd)		virt_to_page((void *)pmd_page_vaddr(pmd))
 #define set_pmd(pmdp, pmd)	(*(pmdp) = pmd)
 #define pmd_pgtable(pmd)	((pgtable_t) pmd_page(pmd))
 

-- 
2.34.1

[PATCH 2/2] Hexagon: Make pfn accessors statics inlines

[Linus Walleij]

Making virt_to_pfn() a static inline taking a strongly typed
(const void *) makes the contract of a passing a pointer of that
type to the function explicit and exposes any misuse of the
macro virt_to_pfn() acting polymorphic and accepting many types
such as (void *), (unitptr_t) or (unsigned long) as arguments
without warnings.

For symmetry do the same with pfn_to_virt().

For compiletime resolution of __pa() we need PAGE_OFFSET which
was not available to __pa() and resolved by the preprocessor
wherever __pa() was used. Fix this by explicitly including
<asm/mem-layout.h> where required, following the pattern of the
architectures page.h file.

Acked-by: Brian Cain <bcain@quicinc.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 arch/hexagon/include/asm/page.h | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/arch/hexagon/include/asm/page.h b/arch/hexagon/include/asm/page.h
index 9c03b9965f07..10f1bc07423c 100644
--- a/arch/hexagon/include/asm/page.h
+++ b/arch/hexagon/include/asm/page.h
@@ -78,6 +78,9 @@ typedef struct page *pgtable_t;
 #define __pgd(x)       ((pgd_t) { (x) })
 #define __pgprot(x)    ((pgprot_t) { (x) })
 
+/* Needed for PAGE_OFFSET used in the macro right below */
+#include <asm/mem-layout.h>
+
 /*
  * We need a __pa and a __va routine for kernel space.
  * MIPS says they're only used during mem_init.
@@ -125,8 +128,16 @@ static inline void clear_page(void *page)
  */
 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 
-#define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
-#define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
+static inline unsigned long virt_to_pfn(const void *kaddr)
+{
+	return __pa(kaddr) >> PAGE_SHIFT;
+}
+
+static inline void *pfn_to_virt(unsigned long pfn)
+{
+	return (void *)((unsigned long)__va(pfn) << PAGE_SHIFT);
+}
+
 
 #define page_to_virt(page)	__va(page_to_phys(page))
 

-- 
2.34.1