[PATCH v3 00/12] arch: Make virt_to_pfn into a static inline

[PATCH v3 00/12] arch: Make virt_to_pfn into a static inline

[Linus Walleij]

This is an attempt to harden the typing on virt_to_pfn()
and pfn_to_virt().

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, we do the same with pfn_to_virt().

The problem with this inconsistent typing was pointed out by
Russell King:
https://lore.kernel.org/linux-arm-kernel/YoJDKJXc0MJ2QZTb@shell.armlinux.org.uk/

And confirmed by Andrew Morton:
https://lore.kernel.org/linux-mm/20220701160004.2ffff4e5ab59a55499f4c736@linux-foundation.org/

So the recognition of the problem is widespread.

These platforms have been chosen as initial conversion targets:

- ARC
- ARM
- ARM64/Aarch64
- asm-generic (including for example x86)
- m68k

The idea is that if this goes in, it will block further misuse
of the function signatures due to the large compile coverage,
and then I can go in and fix the remaining platforms on a
one-by-one basis.

Some of the patches have been circulated before but were not
picked up by subsystem maintainers, so now the arch tree is
target for this series.

It has passed zeroday builds after a lot of iterations in my
personal tree, but there could be some randconfig outliers.

The To/Cc list would be too long if I include all the minor
patches maintainers, so I have trimmed it down to the mailing
lists since these people certainly have received the patches
before.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
Changes in v3:
- Fix up the Coldfire changes in accordance with Geert's feedback.
- Link to v2: https://lore.kernel.org/r/20230503-virt-to-pfn-v6-4-rc1-v2-0-0948d38bddab@linaro.org

Changes in v2:
- Fix some "void * x" into "void *x" in generic page accessors and
  in m68k.
- Collected a few ACKs
- All build tests appear to pass!
- Added Andrew Mortin to To: line to see what he thinks
- Link to v1: https://lore.kernel.org/r/20230503-virt-to-pfn-v6-4-rc1-v1-0-6c4698dcf9c8@linaro.org

---
Linus Walleij (12):
      fs/proc/kcore.c: Pass a pointer to virt_addr_valid()
      m68k: Pass a pointer to virt_to_pfn() virt_to_page()
      ARC: init: Pass a pointer to virt_to_pfn() in init
      riscv: mm: init: Pass a pointer to virt_to_page()
      cifs: Pass a pointer to virt_to_page()
      cifs: Pass a pointer to virt_to_page() in cifsglob
      netfs: Pass a pointer to virt_to_page()
      arm64: vdso: Pass (void *) to virt_to_page()
      asm-generic/page.h: Make pfn accessors static inlines
      ARM: mm: Make virt_to_pfn() a static inline
      arm64: memory: Make virt_to_pfn() a static inline
      m68k/mm: Make pfn accessors static inlines

 arch/arc/mm/init.c                   |  2 +-
 arch/arm/common/sharpsl_param.c      |  2 +-
 arch/arm/include/asm/delay.h         |  2 +-
 arch/arm/include/asm/io.h            |  2 +-
 arch/arm/include/asm/memory.h        | 17 ++++++++++++-----
 arch/arm/include/asm/page.h          |  4 ++--
 arch/arm/include/asm/pgtable.h       |  2 +-
 arch/arm/include/asm/proc-fns.h      |  2 --
 arch/arm/include/asm/sparsemem.h     |  2 +-
 arch/arm/include/asm/uaccess-asm.h   |  2 +-
 arch/arm/include/asm/uaccess.h       |  2 +-
 arch/arm/kernel/asm-offsets.c        |  2 +-
 arch/arm/kernel/entry-armv.S         |  2 +-
 arch/arm/kernel/entry-common.S       |  2 +-
 arch/arm/kernel/entry-v7m.S          |  2 +-
 arch/arm/kernel/head-nommu.S         |  3 +--
 arch/arm/kernel/head.S               |  2 +-
 arch/arm/kernel/hibernate.c          |  2 +-
 arch/arm/kernel/suspend.c            |  2 +-
 arch/arm/kernel/tcm.c                |  2 +-
 arch/arm/kernel/vmlinux-xip.lds.S    |  3 +--
 arch/arm/kernel/vmlinux.lds.S        |  3 +--
 arch/arm/mach-berlin/platsmp.c       |  2 +-
 arch/arm/mach-keystone/keystone.c    |  2 +-
 arch/arm/mach-omap2/sleep33xx.S      |  2 +-
 arch/arm/mach-omap2/sleep43xx.S      |  2 +-
 arch/arm/mach-omap2/sleep44xx.S      |  2 +-
 arch/arm/mach-pxa/gumstix.c          |  2 +-
 arch/arm/mach-rockchip/sleep.S       |  2 +-
 arch/arm/mach-sa1100/pm.c            |  2 +-
 arch/arm/mach-shmobile/headsmp-scu.S |  2 +-
 arch/arm/mach-shmobile/headsmp.S     |  2 +-
 arch/arm/mach-socfpga/headsmp.S      |  2 +-
 arch/arm/mach-spear/spear.h          |  2 +-
 arch/arm/mm/cache-fa.S               |  1 -
 arch/arm/mm/cache-v4wb.S             |  1 -
 arch/arm/mm/dma-mapping.c            |  2 +-
 arch/arm/mm/dump.c                   |  2 +-
 arch/arm/mm/init.c                   |  2 +-
 arch/arm/mm/kasan_init.c             |  1 -
 arch/arm/mm/mmu.c                    |  2 +-
 arch/arm/mm/physaddr.c               |  2 +-
 arch/arm/mm/pmsa-v8.c                |  2 +-
 arch/arm/mm/proc-v7.S                |  2 +-
 arch/arm/mm/proc-v7m.S               |  2 +-
 arch/arm/mm/pv-fixup-asm.S           |  2 +-
 arch/arm64/include/asm/memory.h      |  9 ++++++++-
 arch/arm64/kernel/vdso.c             |  2 +-
 arch/m68k/include/asm/mcf_pgtable.h  |  3 +--
 arch/m68k/include/asm/page_mm.h      | 11 +++++++++--
 arch/m68k/include/asm/page_no.h      | 11 +++++++++--
 arch/m68k/include/asm/sun3_pgtable.h |  4 ++--
 arch/m68k/mm/mcfmmu.c                |  3 ++-
 arch/m68k/mm/motorola.c              |  4 ++--
 arch/m68k/mm/sun3mmu.c               |  2 +-
 arch/m68k/sun3/dvma.c                |  2 +-
 arch/m68k/sun3x/dvma.c               |  2 +-
 arch/riscv/mm/init.c                 |  4 ++--
 drivers/memory/ti-emif-sram-pm.S     |  2 +-
 fs/cifs/cifsglob.h                   |  2 +-
 fs/cifs/smbdirect.c                  |  2 +-
 fs/netfs/iterator.c                  |  2 +-
 fs/proc/kcore.c                      |  2 +-
 include/asm-generic/page.h           | 12 ++++++++++--
 64 files changed, 108 insertions(+), 80 deletions(-)
---
base-commit: ac9a78681b921877518763ba0e89202254349d1b
change-id: 20230503-virt-to-pfn-v6-4-rc1-4f5739e8d60d

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

[PATCH v3 01/12] fs/proc/kcore.c: Pass a pointer to virt_addr_valid()

[Linus Walleij]

The virt_addr_valid() should be passed a pointer, the current
code passing a long unsigned int is just exploiting the
unintentional polymorphism of these calls being implemented
as preprocessor macros.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 fs/proc/kcore.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
index 25b44b303b35..75708c66527f 100644
--- a/fs/proc/kcore.c
+++ b/fs/proc/kcore.c
@@ -199,7 +199,7 @@ kclist_add_private(unsigned long pfn, unsigned long nr_pages, void *arg)
 	ent->addr = (unsigned long)page_to_virt(p);
 	ent->size = nr_pages << PAGE_SHIFT;
 
-	if (!virt_addr_valid(ent->addr))
+	if (!virt_addr_valid((void *)ent->addr))
 		goto free_out;
 
 	/* cut not-mapped area. ....from ppc-32 code. */

-- 
2.34.1

[PATCH v3 02/12] m68k: Pass a pointer to virt_to_pfn() virt_to_page()

[Linus Walleij]

Functions that work on a pointer to virtual memory such as
virt_to_pfn() and users of that function such as
virt_to_page() are supposed to pass a pointer to virtual
memory, ideally a (void *) or other pointer. However since
many architectures implement virt_to_pfn() as a macro,
this function becomes polymorphic and accepts both a
(unsigned long) and a (void *).

Fix up the offending calls in arch/m68k with explicit casts.

The page table include <asm/pgtable.h> will include different
variants of the defines depending on whether you build for
classic m68k, ColdFire or Sun3, so fix all variants.

Tested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
ChangeLog v2->v3:
- Fix up versioning. This is v3.
- Let Coldfire __pte_page() return a (void *) instead of __va
- Delete Coldfire pte_pagenr() which was using unsigned long
  semantics from __pte_page()
- Drop ill-advised change to Coldfire pmd_page_vaddr()
ChangeLog v1->v2:
- Fix the sun3 pgtable macro to not cast to unsigned long.
- Make a similar change to the ColdFire include.
- Add an extra parens around the page argument to the
  PD_PTABLE() macro, as is normally required.
---
 arch/m68k/include/asm/mcf_pgtable.h  | 3 +--
 arch/m68k/include/asm/sun3_pgtable.h | 4 ++--
 arch/m68k/mm/mcfmmu.c                | 3 ++-
 arch/m68k/mm/motorola.c              | 4 ++--
 arch/m68k/mm/sun3mmu.c               | 2 +-
 arch/m68k/sun3/dvma.c                | 2 +-
 arch/m68k/sun3x/dvma.c               | 2 +-
 7 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/arch/m68k/include/asm/mcf_pgtable.h b/arch/m68k/include/asm/mcf_pgtable.h
index d97fbb812f63..43e8da8465f9 100644
--- a/arch/m68k/include/asm/mcf_pgtable.h
+++ b/arch/m68k/include/asm/mcf_pgtable.h
@@ -115,7 +115,7 @@ static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
 	pgd_val(*pgdp) = virt_to_phys(pmdp);
 }
 
-#define __pte_page(pte)	((unsigned long) (pte_val(pte) & PAGE_MASK))
+#define __pte_page(pte)	((void *) (pte_val(pte) & PAGE_MASK))
 #define pmd_page_vaddr(pmd)	((unsigned long) (pmd_val(pmd)))
 
 static inline int pte_none(pte_t pte)
@@ -134,7 +134,6 @@ static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
 	pte_val(*ptep) = 0;
 }
 
-#define pte_pagenr(pte)	((__pte_page(pte) - PAGE_OFFSET) >> PAGE_SHIFT)
 #define pte_page(pte)	virt_to_page(__pte_page(pte))
 
 static inline int pmd_none2(pmd_t *pmd) { return !pmd_val(*pmd); }
diff --git a/arch/m68k/include/asm/sun3_pgtable.h b/arch/m68k/include/asm/sun3_pgtable.h
index e582b0484a55..f428f73125d5 100644
--- a/arch/m68k/include/asm/sun3_pgtable.h
+++ b/arch/m68k/include/asm/sun3_pgtable.h
@@ -91,7 +91,7 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 #define pmd_set(pmdp,ptep) do {} while (0)
 
 #define __pte_page(pte) \
-((unsigned long) __va ((pte_val (pte) & SUN3_PAGE_PGNUM_MASK) << PAGE_SHIFT))
+(__va ((pte_val (pte) & SUN3_PAGE_PGNUM_MASK) << PAGE_SHIFT))
 
 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
 {
@@ -111,7 +111,7 @@ static inline void pte_clear (struct mm_struct *mm, unsigned long addr, pte_t *p
 
 #define pte_page(pte)		virt_to_page(__pte_page(pte))
 #define pmd_pfn(pmd)		(pmd_val(pmd) >> 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))
 
 
 static inline int pmd_none2 (pmd_t *pmd) { return !pmd_val (*pmd); }
diff --git a/arch/m68k/mm/mcfmmu.c b/arch/m68k/mm/mcfmmu.c
index 70aa0979e027..278e85fcecd4 100644
--- a/arch/m68k/mm/mcfmmu.c
+++ b/arch/m68k/mm/mcfmmu.c
@@ -69,7 +69,8 @@ void __init paging_init(void)
 
 		/* now change pg_table to kernel virtual addresses */
 		for (i = 0; i < PTRS_PER_PTE; ++i, ++pg_table) {
-			pte_t pte = pfn_pte(virt_to_pfn(address), PAGE_INIT);
+			pte_t pte = pfn_pte(virt_to_pfn((void *)address),
+					    PAGE_INIT);
 			if (address >= (unsigned long) high_memory)
 				pte_val(pte) = 0;
 
diff --git a/arch/m68k/mm/motorola.c b/arch/m68k/mm/motorola.c
index 911301224078..c75984e2d86b 100644
--- a/arch/m68k/mm/motorola.c
+++ b/arch/m68k/mm/motorola.c
@@ -102,7 +102,7 @@ static struct list_head ptable_list[2] = {
 	LIST_HEAD_INIT(ptable_list[1]),
 };
 
-#define PD_PTABLE(page) ((ptable_desc *)&(virt_to_page(page)->lru))
+#define PD_PTABLE(page) ((ptable_desc *)&(virt_to_page((void *)(page))->lru))
 #define PD_PAGE(ptable) (list_entry(ptable, struct page, lru))
 #define PD_MARKBITS(dp) (*(unsigned int *)&PD_PAGE(dp)->index)
 
@@ -201,7 +201,7 @@ int free_pointer_table(void *table, int type)
 		list_del(dp);
 		mmu_page_dtor((void *)page);
 		if (type == TABLE_PTE)
-			pgtable_pte_page_dtor(virt_to_page(page));
+			pgtable_pte_page_dtor(virt_to_page((void *)page));
 		free_page (page);
 		return 1;
 	} else if (ptable_list[type].next != dp) {
diff --git a/arch/m68k/mm/sun3mmu.c b/arch/m68k/mm/sun3mmu.c
index b619d0d4319c..c5e6a23e0262 100644
--- a/arch/m68k/mm/sun3mmu.c
+++ b/arch/m68k/mm/sun3mmu.c
@@ -75,7 +75,7 @@ void __init paging_init(void)
 		/* now change pg_table to kernel virtual addresses */
 		pg_table = (pte_t *) __va ((unsigned long) pg_table);
 		for (i=0; i<PTRS_PER_PTE; ++i, ++pg_table) {
-			pte_t pte = pfn_pte(virt_to_pfn(address), PAGE_INIT);
+			pte_t pte = pfn_pte(virt_to_pfn((void *)address), PAGE_INIT);
 			if (address >= (unsigned long)high_memory)
 				pte_val (pte) = 0;
 			set_pte (pg_table, pte);
diff --git a/arch/m68k/sun3/dvma.c b/arch/m68k/sun3/dvma.c
index f15ff16b9997..83fcae6a0e79 100644
--- a/arch/m68k/sun3/dvma.c
+++ b/arch/m68k/sun3/dvma.c
@@ -29,7 +29,7 @@ static unsigned long dvma_page(unsigned long kaddr, unsigned long vaddr)
 	j = *(volatile unsigned long *)kaddr;
 	*(volatile unsigned long *)kaddr = j;
 
-	ptep = pfn_pte(virt_to_pfn(kaddr), PAGE_KERNEL);
+	ptep = pfn_pte(virt_to_pfn((void *)kaddr), PAGE_KERNEL);
 	pte = pte_val(ptep);
 //	pr_info("dvma_remap: addr %lx -> %lx pte %08lx\n", kaddr, vaddr, pte);
 	if(ptelist[(vaddr & 0xff000) >> PAGE_SHIFT] != pte) {
diff --git a/arch/m68k/sun3x/dvma.c b/arch/m68k/sun3x/dvma.c
index 08bb92113026..a6034ba05845 100644
--- a/arch/m68k/sun3x/dvma.c
+++ b/arch/m68k/sun3x/dvma.c
@@ -125,7 +125,7 @@ inline int dvma_map_cpu(unsigned long kaddr,
 			do {
 				pr_debug("mapping %08lx phys to %08lx\n",
 					 __pa(kaddr), vaddr);
-				set_pte(pte, pfn_pte(virt_to_pfn(kaddr),
+				set_pte(pte, pfn_pte(virt_to_pfn((void *)kaddr),
 						     PAGE_KERNEL));
 				pte++;
 				kaddr += PAGE_SIZE;

-- 
2.34.1

[PATCH v3 03/12] ARC: init: Pass a pointer to virt_to_pfn() in init

[Linus Walleij]

Functions that work on a pointer to virtual memory such as
virt_to_pfn() and users of that function such as
virt_to_page() are supposed to pass a pointer to virtual
memory, ideally a (void *) or other pointer. However since
many architectures implement virt_to_pfn() as a macro,
this function becomes polymorphic and accepts both a
(unsigned long) and a (void *).

Fix up the offending call in arch/arc with an explicit cast.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 arch/arc/mm/init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arc/mm/init.c b/arch/arc/mm/init.c
index 2b89b6c53801..9f64d729c9f8 100644
--- a/arch/arc/mm/init.c
+++ b/arch/arc/mm/init.c
@@ -87,7 +87,7 @@ void __init setup_arch_memory(void)
 	setup_initial_init_mm(_text, _etext, _edata, _end);
 
 	/* first page of system - kernel .vector starts here */
-	min_low_pfn = virt_to_pfn(CONFIG_LINUX_RAM_BASE);
+	min_low_pfn = virt_to_pfn((void *)CONFIG_LINUX_RAM_BASE);
 
 	/* Last usable page of low mem */
 	max_low_pfn = max_pfn = PFN_DOWN(low_mem_start + low_mem_sz);

-- 
2.34.1

[PATCH v3 04/12] riscv: mm: init: Pass a pointer to virt_to_page()

[Linus Walleij]

Functions that work on a pointer to virtual memory such as
virt_to_pfn() and users of that function such as
virt_to_page() are supposed to pass a pointer to virtual
memory, ideally a (void *) or other pointer. However since
many architectures implement virt_to_pfn() as a macro,
this function becomes polymorphic and accepts both a
(unsigned long) and a (void *).

Fix this in the RISCV mm init code, so we can implement
a strongly typed virt_to_pfn().

Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 arch/riscv/mm/init.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index 747e5b1ef02d..2f7a7c345a6a 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -356,7 +356,7 @@ static phys_addr_t __init alloc_pte_late(uintptr_t va)
 	unsigned long vaddr;
 
 	vaddr = __get_free_page(GFP_KERNEL);
-	BUG_ON(!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr)));
+	BUG_ON(!vaddr || !pgtable_pte_page_ctor(virt_to_page((void *)vaddr)));
 
 	return __pa(vaddr);
 }
@@ -439,7 +439,7 @@ static phys_addr_t __init alloc_pmd_late(uintptr_t va)
 	unsigned long vaddr;
 
 	vaddr = __get_free_page(GFP_KERNEL);
-	BUG_ON(!vaddr || !pgtable_pmd_page_ctor(virt_to_page(vaddr)));
+	BUG_ON(!vaddr || !pgtable_pmd_page_ctor(virt_to_page((void *)vaddr)));
 
 	return __pa(vaddr);
 }

-- 
2.34.1

[PATCH v3 05/12] cifs: Pass a pointer to virt_to_page()

[Linus Walleij]

Like the other calls in this function virt_to_page() expects
a pointer, not an integer.

However since many architectures implement virt_to_pfn() as
a macro, this function becomes polymorphic and accepts both a
(unsigned long) and a (void *).

Fix this up with an explicit cast.

Acked-by: Tom Talpey <tom@talpey.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 fs/cifs/smbdirect.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/cifs/smbdirect.c b/fs/cifs/smbdirect.c
index 0362ebd4fa0f..964f07375a8d 100644
--- a/fs/cifs/smbdirect.c
+++ b/fs/cifs/smbdirect.c
@@ -2500,7 +2500,7 @@ static ssize_t smb_extract_kvec_to_rdma(struct iov_iter *iter,
 			if (is_vmalloc_or_module_addr((void *)kaddr))
 				page = vmalloc_to_page((void *)kaddr);
 			else
-				page = virt_to_page(kaddr);
+				page = virt_to_page((void *)kaddr);
 
 			if (!smb_set_sge(rdma, page, off, seg))
 				return -EIO;

-- 
2.34.1

[PATCH v3 06/12] cifs: Pass a pointer to virt_to_page() in cifsglob

[Linus Walleij]

Like the other calls in this function virt_to_page() expects
a pointer, not an integer.

However since many architectures implement virt_to_pfn() as
a macro, this function becomes polymorphic and accepts both a
(unsigned long) and a (void *).

Fix this up with an explicit cast.

Acked-by: Tom Talpey <tom@talpey.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 fs/cifs/cifsglob.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 414685c5d530..3d29a4bbbc40 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -2218,7 +2218,7 @@ static inline void cifs_sg_set_buf(struct sg_table *sgtable,
 		} while (buflen);
 	} else {
 		sg_set_page(&sgtable->sgl[sgtable->nents++],
-			    virt_to_page(addr), buflen, off);
+			    virt_to_page((void *)addr), buflen, off);
 	}
 }
 

-- 
2.34.1

[PATCH v3 07/12] netfs: Pass a pointer to virt_to_page()

[Linus Walleij]

Like the other calls in this function virt_to_page() expects
a pointer, not an integer.

However since many architectures implement virt_to_pfn() as
a macro, this function becomes polymorphic and accepts both a
(unsigned long) and a (void *).

Fix this up with an explicit cast.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 fs/netfs/iterator.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/netfs/iterator.c b/fs/netfs/iterator.c
index 8a4c86687429..0431ec4a7298 100644
--- a/fs/netfs/iterator.c
+++ b/fs/netfs/iterator.c
@@ -240,7 +240,7 @@ static ssize_t netfs_extract_kvec_to_sg(struct iov_iter *iter,
 			if (is_vmalloc_or_module_addr((void *)kaddr))
 				page = vmalloc_to_page((void *)kaddr);
 			else
-				page = virt_to_page(kaddr);
+				page = virt_to_page((void *)kaddr);
 
 			sg_set_page(sg, page, len, off);
 			sgtable->nents++;

-- 
2.34.1

[PATCH v3 08/12] arm64: vdso: Pass (void *) to virt_to_page()

[Linus Walleij]

Like the other calls in this function virt_to_page() expects
a pointer, not an integer.

However since many architectures implement virt_to_pfn() as
a macro, this function becomes polymorphic and accepts both a
(unsigned long) and a (void *).

Fix this up with an explicit cast.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 arch/arm64/kernel/vdso.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/vdso.c b/arch/arm64/kernel/vdso.c
index 0119dc91abb5..d9e1355730ef 100644
--- a/arch/arm64/kernel/vdso.c
+++ b/arch/arm64/kernel/vdso.c
@@ -288,7 +288,7 @@ static int aarch32_alloc_kuser_vdso_page(void)
 
 	memcpy((void *)(vdso_page + 0x1000 - kuser_sz), __kuser_helper_start,
 	       kuser_sz);
-	aarch32_vectors_page = virt_to_page(vdso_page);
+	aarch32_vectors_page = virt_to_page((void *)vdso_page);
 	return 0;
 }
 

-- 
2.34.1

[PATCH v3 09/12] asm-generic/page.h: Make pfn accessors static 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 we do the same change for pfn_to_virt.

Immediately define virt_to_pfn and pfn_to_virt to the static
inline after the static inline since this style of defining
functions is used for the generic helpers.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 include/asm-generic/page.h | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/include/asm-generic/page.h b/include/asm-generic/page.h
index c0be2edeb484..9773582fd96e 100644
--- a/include/asm-generic/page.h
+++ b/include/asm-generic/page.h
@@ -74,8 +74,16 @@ extern unsigned long memory_end;
 #define __va(x) ((void *)((unsigned long) (x)))
 #define __pa(x) ((unsigned long) (x))
 
-#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;
+}
+#define virt_to_pfn virt_to_pfn
+static inline void *pfn_to_virt(unsigned long pfn)
+{
+	return __va(pfn) << PAGE_SHIFT;
+}
+#define pfn_to_virt pfn_to_virt
 
 #define virt_to_page(addr)	pfn_to_page(virt_to_pfn(addr))
 #define page_to_virt(page)	pfn_to_virt(page_to_pfn(page))

-- 
2.34.1

[PATCH v3 10/12] ARM: 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.

Doing this is a bit intrusive: virt_to_pfn() requires
PHYS_PFN_OFFSET and PAGE_SHIFT to be defined, and this is defined in
<asm/page.h>, so this must be included *before* <asm/memory.h>.

The use of macros were obscuring the unclear inclusion order here,
as the macros would eventually be resolved, but a static inline
like this cannot be compiled with unresolved macros.

The naive solution to include <asm/page.h> at the top of
<asm/memory.h> does not work, because <asm/memory.h> sometimes
includes <asm/page.h> at the end of itself, which would create a
confusing inclusion loop. So instead, take the approach to always
unconditionally include <asm/page.h> at the end of <asm/memory.h>

arch/arm uses <asm/memory.h> explicitly in a lot of places,
however it turns out that if we just unconditionally include
<asm/memory.h> into <asm/page.h> and switch all inclusions of
<asm/memory.h> to <asm/page.h> instead, we enforce the right
order and <asm/memory.h> will always have access to the
definitions.

Put an inclusion guard in place making it impossible to include
<asm/memory.h> explicitly.

Link: https://lore.kernel.org/linux-mm/20220701160004.2ffff4e5ab59a55499f4c736@linux-foundation.org/
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
Russell: the <asm/memory.h> vs <asm/page.h> inclusion really
gave me headaches, if you have a better idea how to do it
I'm all ears!
---
 arch/arm/common/sharpsl_param.c      |  2 +-
 arch/arm/include/asm/delay.h         |  2 +-
 arch/arm/include/asm/io.h            |  2 +-
 arch/arm/include/asm/memory.h        | 17 ++++++++++++-----
 arch/arm/include/asm/page.h          |  4 ++--
 arch/arm/include/asm/pgtable.h       |  2 +-
 arch/arm/include/asm/proc-fns.h      |  2 --
 arch/arm/include/asm/sparsemem.h     |  2 +-
 arch/arm/include/asm/uaccess-asm.h   |  2 +-
 arch/arm/include/asm/uaccess.h       |  2 +-
 arch/arm/kernel/asm-offsets.c        |  2 +-
 arch/arm/kernel/entry-armv.S         |  2 +-
 arch/arm/kernel/entry-common.S       |  2 +-
 arch/arm/kernel/entry-v7m.S          |  2 +-
 arch/arm/kernel/head-nommu.S         |  3 +--
 arch/arm/kernel/head.S               |  2 +-
 arch/arm/kernel/hibernate.c          |  2 +-
 arch/arm/kernel/suspend.c            |  2 +-
 arch/arm/kernel/tcm.c                |  2 +-
 arch/arm/kernel/vmlinux-xip.lds.S    |  3 +--
 arch/arm/kernel/vmlinux.lds.S        |  3 +--
 arch/arm/mach-berlin/platsmp.c       |  2 +-
 arch/arm/mach-keystone/keystone.c    |  2 +-
 arch/arm/mach-omap2/sleep33xx.S      |  2 +-
 arch/arm/mach-omap2/sleep43xx.S      |  2 +-
 arch/arm/mach-omap2/sleep44xx.S      |  2 +-
 arch/arm/mach-pxa/gumstix.c          |  2 +-
 arch/arm/mach-rockchip/sleep.S       |  2 +-
 arch/arm/mach-sa1100/pm.c            |  2 +-
 arch/arm/mach-shmobile/headsmp-scu.S |  2 +-
 arch/arm/mach-shmobile/headsmp.S     |  2 +-
 arch/arm/mach-socfpga/headsmp.S      |  2 +-
 arch/arm/mach-spear/spear.h          |  2 +-
 arch/arm/mm/cache-fa.S               |  1 -
 arch/arm/mm/cache-v4wb.S             |  1 -
 arch/arm/mm/dma-mapping.c            |  2 +-
 arch/arm/mm/dump.c                   |  2 +-
 arch/arm/mm/init.c                   |  2 +-
 arch/arm/mm/kasan_init.c             |  1 -
 arch/arm/mm/mmu.c                    |  2 +-
 arch/arm/mm/physaddr.c               |  2 +-
 arch/arm/mm/pmsa-v8.c                |  2 +-
 arch/arm/mm/proc-v7.S                |  2 +-
 arch/arm/mm/proc-v7m.S               |  2 +-
 arch/arm/mm/pv-fixup-asm.S           |  2 +-
 drivers/memory/ti-emif-sram-pm.S     |  2 +-
 46 files changed, 54 insertions(+), 55 deletions(-)

diff --git a/arch/arm/common/sharpsl_param.c b/arch/arm/common/sharpsl_param.c
index 6237ede2f0c7..1ca26c063f80 100644
--- a/arch/arm/common/sharpsl_param.c
+++ b/arch/arm/common/sharpsl_param.c
@@ -11,7 +11,7 @@
 #include <linux/module.h>
 #include <linux/string.h>
 #include <asm/mach/sharpsl_param.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 
 /*
  * Certain hardware parameters determined at the time of device manufacture,
diff --git a/arch/arm/include/asm/delay.h b/arch/arm/include/asm/delay.h
index 4f80b72372b4..1d069e558d8d 100644
--- a/arch/arm/include/asm/delay.h
+++ b/arch/arm/include/asm/delay.h
@@ -7,7 +7,7 @@
 #ifndef __ASM_ARM_DELAY_H
 #define __ASM_ARM_DELAY_H
 
-#include <asm/memory.h>
+#include <asm/page.h>
 #include <asm/param.h>	/* HZ */
 
 /*
diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h
index 7fcdc785366c..56b08ed6cc3b 100644
--- a/arch/arm/include/asm/io.h
+++ b/arch/arm/include/asm/io.h
@@ -23,7 +23,7 @@
 #include <linux/string.h>
 #include <linux/types.h>
 #include <asm/byteorder.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 #include <asm-generic/pci_iomap.h>
 
 /*
diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
index 62e9df024445..ef2aa79ece5a 100644
--- a/arch/arm/include/asm/memory.h
+++ b/arch/arm/include/asm/memory.h
@@ -5,11 +5,16 @@
  *  Copyright (C) 2000-2002 Russell King
  *  modification for nommu, Hyok S. Choi, 2004
  *
- *  Note: this file should not be included by non-asm/.h files
+ *  Note: this file should not be included explicitly, include <asm/page.h>
+ *  to get access to these definitions.
  */
 #ifndef __ASM_ARM_MEMORY_H
 #define __ASM_ARM_MEMORY_H
 
+#ifndef _ASMARM_PAGE_H
+#error "Do not include <asm/memory.h> directly"
+#endif
+
 #include <linux/compiler.h>
 #include <linux/const.h>
 #include <linux/types.h>
@@ -288,10 +293,12 @@ static inline unsigned long __phys_to_virt(phys_addr_t x)
 
 #endif
 
-#define virt_to_pfn(kaddr) \
-	((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \
-	 PHYS_PFN_OFFSET)
-
+static inline unsigned long virt_to_pfn(const void *p)
+{
+	unsigned long kaddr = (unsigned long)p;
+	return (((kaddr - PAGE_OFFSET) >> PAGE_SHIFT) +
+		PHYS_PFN_OFFSET);
+}
 #define __pa_symbol_nodebug(x)	__virt_to_phys_nodebug((x))
 
 #ifdef CONFIG_DEBUG_VIRTUAL
diff --git a/arch/arm/include/asm/page.h b/arch/arm/include/asm/page.h
index 74bb5947b387..4e44f9707376 100644
--- a/arch/arm/include/asm/page.h
+++ b/arch/arm/include/asm/page.h
@@ -161,10 +161,10 @@ extern int pfn_valid(unsigned long);
 #define pfn_valid pfn_valid
 #endif
 
-#include <asm/memory.h>
-
 #endif /* !__ASSEMBLY__ */
 
+#include <asm/memory.h>
+
 #define VM_DATA_DEFAULT_FLAGS	VM_DATA_FLAGS_TSK_EXEC
 
 #include <asm-generic/getorder.h>
diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h
index a58ccbb406ad..34662a9d4cab 100644
--- a/arch/arm/include/asm/pgtable.h
+++ b/arch/arm/include/asm/pgtable.h
@@ -27,7 +27,7 @@ extern struct page *empty_zero_page;
 #else
 
 #include <asm-generic/pgtable-nopud.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 #include <asm/pgtable-hwdef.h>
 
 
diff --git a/arch/arm/include/asm/proc-fns.h b/arch/arm/include/asm/proc-fns.h
index c82f7a29ec4a..280396483f5d 100644
--- a/arch/arm/include/asm/proc-fns.h
+++ b/arch/arm/include/asm/proc-fns.h
@@ -147,8 +147,6 @@ static inline void init_proc_vtable(const struct processor *p)
 
 extern void cpu_resume(void);
 
-#include <asm/memory.h>
-
 #ifdef CONFIG_MMU
 
 #define cpu_switch_mm(pgd,mm) cpu_do_switch_mm(virt_to_phys(pgd),mm)
diff --git a/arch/arm/include/asm/sparsemem.h b/arch/arm/include/asm/sparsemem.h
index d362233856a5..421e3415338a 100644
--- a/arch/arm/include/asm/sparsemem.h
+++ b/arch/arm/include/asm/sparsemem.h
@@ -2,7 +2,7 @@
 #ifndef ASMARM_SPARSEMEM_H
 #define ASMARM_SPARSEMEM_H
 
-#include <asm/memory.h>
+#include <asm/page.h>
 
 /*
  * Two definitions are required for sparsemem:
diff --git a/arch/arm/include/asm/uaccess-asm.h b/arch/arm/include/asm/uaccess-asm.h
index 6451a433912c..65da32e1f1c1 100644
--- a/arch/arm/include/asm/uaccess-asm.h
+++ b/arch/arm/include/asm/uaccess-asm.h
@@ -5,7 +5,7 @@
 
 #include <asm/asm-offsets.h>
 #include <asm/domain.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 #include <asm/thread_info.h>
 
 	.macro	csdb
diff --git a/arch/arm/include/asm/uaccess.h b/arch/arm/include/asm/uaccess.h
index 2fcbec9c306c..bb5c81823117 100644
--- a/arch/arm/include/asm/uaccess.h
+++ b/arch/arm/include/asm/uaccess.h
@@ -9,7 +9,7 @@
  * User space memory access functions
  */
 #include <linux/string.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 #include <asm/domain.h>
 #include <asm/unaligned.h>
 #include <asm/unified.h>
diff --git a/arch/arm/kernel/asm-offsets.c b/arch/arm/kernel/asm-offsets.c
index 38121c59cbc2..6a80d4be743b 100644
--- a/arch/arm/kernel/asm-offsets.c
+++ b/arch/arm/kernel/asm-offsets.c
@@ -17,7 +17,7 @@
 #include <asm/glue-pf.h>
 #include <asm/mach/arch.h>
 #include <asm/thread_info.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 #include <asm/mpu.h>
 #include <asm/procinfo.h>
 #include <asm/suspend.h>
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index c39303e5c234..112fd6cd3f26 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -15,7 +15,7 @@
 #include <linux/init.h>
 
 #include <asm/assembler.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 #include <asm/glue-df.h>
 #include <asm/glue-pf.h>
 #include <asm/vfpmacros.h>
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index 03d4c5578c5c..bcc4c9ec3aa4 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -9,7 +9,7 @@
 #include <asm/unistd.h>
 #include <asm/ftrace.h>
 #include <asm/unwind.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 #ifdef CONFIG_AEABI
 #include <asm/unistd-oabi.h>
 #endif
diff --git a/arch/arm/kernel/entry-v7m.S b/arch/arm/kernel/entry-v7m.S
index de8a60363c85..52bacf07ba16 100644
--- a/arch/arm/kernel/entry-v7m.S
+++ b/arch/arm/kernel/entry-v7m.S
@@ -6,7 +6,7 @@
  *
  * Low-level vector interface routines for the ARMv7-M architecture
  */
-#include <asm/memory.h>
+#include <asm/page.h>
 #include <asm/glue.h>
 #include <asm/thread_notify.h>
 #include <asm/v7m.h>
diff --git a/arch/arm/kernel/head-nommu.S b/arch/arm/kernel/head-nommu.S
index 950bef83339f..b9d6818f1ee1 100644
--- a/arch/arm/kernel/head-nommu.S
+++ b/arch/arm/kernel/head-nommu.S
@@ -14,12 +14,11 @@
 #include <asm/assembler.h>
 #include <asm/ptrace.h>
 #include <asm/asm-offsets.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 #include <asm/cp15.h>
 #include <asm/thread_info.h>
 #include <asm/v7m.h>
 #include <asm/mpu.h>
-#include <asm/page.h>
 
 /*
  * Kernel startup entry point.
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index 656991055bc1..1ec35f065617 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -17,7 +17,7 @@
 #include <asm/domain.h>
 #include <asm/ptrace.h>
 #include <asm/asm-offsets.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 #include <asm/thread_info.h>
 
 #if defined(CONFIG_DEBUG_LL) && !defined(CONFIG_DEBUG_SEMIHOSTING)
diff --git a/arch/arm/kernel/hibernate.c b/arch/arm/kernel/hibernate.c
index 2373020af965..38a90a3d12b2 100644
--- a/arch/arm/kernel/hibernate.c
+++ b/arch/arm/kernel/hibernate.c
@@ -19,7 +19,7 @@
 #include <asm/system_misc.h>
 #include <asm/idmap.h>
 #include <asm/suspend.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 #include <asm/sections.h>
 #include "reboot.h"
 
diff --git a/arch/arm/kernel/suspend.c b/arch/arm/kernel/suspend.c
index 43f0a3ebf390..c3ec3861dd07 100644
--- a/arch/arm/kernel/suspend.c
+++ b/arch/arm/kernel/suspend.c
@@ -8,7 +8,7 @@
 #include <asm/bugs.h>
 #include <asm/cacheflush.h>
 #include <asm/idmap.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 #include <asm/smp_plat.h>
 #include <asm/suspend.h>
 #include <asm/tlbflush.h>
diff --git a/arch/arm/kernel/tcm.c b/arch/arm/kernel/tcm.c
index d3a85f01b328..f59927bcfbce 100644
--- a/arch/arm/kernel/tcm.c
+++ b/arch/arm/kernel/tcm.c
@@ -15,7 +15,7 @@
 #include <linux/string.h> /* memcpy */
 #include <asm/cputype.h>
 #include <asm/mach/map.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 #include <asm/system_info.h>
 #include <asm/traps.h>
 #include <asm/tcm.h>
diff --git a/arch/arm/kernel/vmlinux-xip.lds.S b/arch/arm/kernel/vmlinux-xip.lds.S
index 76678732c60d..c16d196b5aad 100644
--- a/arch/arm/kernel/vmlinux-xip.lds.S
+++ b/arch/arm/kernel/vmlinux-xip.lds.S
@@ -12,9 +12,8 @@
 #include <asm/vmlinux.lds.h>
 #include <asm/cache.h>
 #include <asm/thread_info.h>
-#include <asm/memory.h>
-#include <asm/mpu.h>
 #include <asm/page.h>
+#include <asm/mpu.h>
 
 OUTPUT_ARCH(arm)
 ENTRY(stext)
diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S
index aa12b65a7fd6..bd9127c4b451 100644
--- a/arch/arm/kernel/vmlinux.lds.S
+++ b/arch/arm/kernel/vmlinux.lds.S
@@ -12,9 +12,8 @@
 #include <asm/vmlinux.lds.h>
 #include <asm/cache.h>
 #include <asm/thread_info.h>
-#include <asm/memory.h>
-#include <asm/mpu.h>
 #include <asm/page.h>
+#include <asm/mpu.h>
 
 OUTPUT_ARCH(arm)
 ENTRY(stext)
diff --git a/arch/arm/mach-berlin/platsmp.c b/arch/arm/mach-berlin/platsmp.c
index 593fc4a69d84..ed94758d30ff 100644
--- a/arch/arm/mach-berlin/platsmp.c
+++ b/arch/arm/mach-berlin/platsmp.c
@@ -12,7 +12,7 @@
 
 #include <asm/cacheflush.h>
 #include <asm/cp15.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 #include <asm/smp_plat.h>
 #include <asm/smp_scu.h>
 
diff --git a/arch/arm/mach-keystone/keystone.c b/arch/arm/mach-keystone/keystone.c
index aa352c2de313..68039aad3014 100644
--- a/arch/arm/mach-keystone/keystone.c
+++ b/arch/arm/mach-keystone/keystone.c
@@ -18,7 +18,7 @@
 #include <asm/mach/map.h>
 #include <asm/mach/arch.h>
 #include <asm/mach/time.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 
 #include "memory.h"
 
diff --git a/arch/arm/mach-omap2/sleep33xx.S b/arch/arm/mach-omap2/sleep33xx.S
index ac3d0b363c51..3bfd8b5e03ed 100644
--- a/arch/arm/mach-omap2/sleep33xx.S
+++ b/arch/arm/mach-omap2/sleep33xx.S
@@ -10,7 +10,7 @@
 #include <linux/platform_data/pm33xx.h>
 #include <linux/ti-emif-sram.h>
 #include <asm/assembler.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 
 #include "iomap.h"
 #include "cm33xx.h"
diff --git a/arch/arm/mach-omap2/sleep43xx.S b/arch/arm/mach-omap2/sleep43xx.S
index 832c91327945..ec0972a48f08 100644
--- a/arch/arm/mach-omap2/sleep43xx.S
+++ b/arch/arm/mach-omap2/sleep43xx.S
@@ -11,7 +11,7 @@
 #include <linux/platform_data/pm33xx.h>
 #include <asm/assembler.h>
 #include <asm/hardware/cache-l2x0.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 
 #include "cm33xx.h"
 #include "common.h"
diff --git a/arch/arm/mach-omap2/sleep44xx.S b/arch/arm/mach-omap2/sleep44xx.S
index f60f6a9aed73..f09c9197808b 100644
--- a/arch/arm/mach-omap2/sleep44xx.S
+++ b/arch/arm/mach-omap2/sleep44xx.S
@@ -9,7 +9,7 @@
 #include <linux/linkage.h>
 #include <asm/assembler.h>
 #include <asm/smp_scu.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 #include <asm/hardware/cache-l2x0.h>
 
 #include "omap-secure.h"
diff --git a/arch/arm/mach-pxa/gumstix.c b/arch/arm/mach-pxa/gumstix.c
index 72b08a9bf0fd..ebeee82e649e 100644
--- a/arch/arm/mach-pxa/gumstix.c
+++ b/arch/arm/mach-pxa/gumstix.c
@@ -26,7 +26,7 @@
 #include <linux/clk.h>
 
 #include <asm/setup.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 #include <asm/mach-types.h>
 #include <asm/irq.h>
 #include <linux/sizes.h>
diff --git a/arch/arm/mach-rockchip/sleep.S b/arch/arm/mach-rockchip/sleep.S
index 3eca3922c944..38b6c5186c3c 100644
--- a/arch/arm/mach-rockchip/sleep.S
+++ b/arch/arm/mach-rockchip/sleep.S
@@ -6,7 +6,7 @@
 
 #include <linux/linkage.h>
 #include <asm/assembler.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 
 .data
 /*
diff --git a/arch/arm/mach-sa1100/pm.c b/arch/arm/mach-sa1100/pm.c
index 9a7079f565bd..9cf5d917bb92 100644
--- a/arch/arm/mach-sa1100/pm.c
+++ b/arch/arm/mach-sa1100/pm.c
@@ -29,7 +29,7 @@
 #include <linux/time.h>
 
 #include <mach/hardware.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 #include <asm/suspend.h>
 #include <asm/mach/time.h>
 
diff --git a/arch/arm/mach-shmobile/headsmp-scu.S b/arch/arm/mach-shmobile/headsmp-scu.S
index d0234296ae62..e892ee794d64 100644
--- a/arch/arm/mach-shmobile/headsmp-scu.S
+++ b/arch/arm/mach-shmobile/headsmp-scu.S
@@ -7,7 +7,7 @@
 
 #include <linux/linkage.h>
 #include <linux/init.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 
 /*
  * Boot code for secondary CPUs.
diff --git a/arch/arm/mach-shmobile/headsmp.S b/arch/arm/mach-shmobile/headsmp.S
index 9466ae61f56a..a956b489b6ea 100644
--- a/arch/arm/mach-shmobile/headsmp.S
+++ b/arch/arm/mach-shmobile/headsmp.S
@@ -11,7 +11,7 @@
 #include <linux/linkage.h>
 #include <linux/threads.h>
 #include <asm/assembler.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 
 #define SCTLR_MMU	0x01
 #define BOOTROM_ADDRESS	0xE6340000
diff --git a/arch/arm/mach-socfpga/headsmp.S b/arch/arm/mach-socfpga/headsmp.S
index 54f1844eac03..f7e91a772428 100644
--- a/arch/arm/mach-socfpga/headsmp.S
+++ b/arch/arm/mach-socfpga/headsmp.S
@@ -6,7 +6,7 @@
  */
 #include <linux/linkage.h>
 #include <linux/init.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 #include <asm/assembler.h>
 
 	.arch	armv7-a
diff --git a/arch/arm/mach-spear/spear.h b/arch/arm/mach-spear/spear.h
index 432efd407c76..f23eaf1e522f 100644
--- a/arch/arm/mach-spear/spear.h
+++ b/arch/arm/mach-spear/spear.h
@@ -10,7 +10,7 @@
 #ifndef __MACH_SPEAR_H
 #define __MACH_SPEAR_H
 
-#include <asm/memory.h>
+#include <asm/page.h>
 
 #if defined(CONFIG_ARCH_SPEAR3XX) || defined (CONFIG_ARCH_SPEAR6XX)
 
diff --git a/arch/arm/mm/cache-fa.S b/arch/arm/mm/cache-fa.S
index 3a464d1649b4..71c64e92dead 100644
--- a/arch/arm/mm/cache-fa.S
+++ b/arch/arm/mm/cache-fa.S
@@ -13,7 +13,6 @@
 #include <linux/linkage.h>
 #include <linux/init.h>
 #include <asm/assembler.h>
-#include <asm/memory.h>
 #include <asm/page.h>
 
 #include "proc-macros.S"
diff --git a/arch/arm/mm/cache-v4wb.S b/arch/arm/mm/cache-v4wb.S
index 905ac2fa2b1e..ad382cee0fdb 100644
--- a/arch/arm/mm/cache-v4wb.S
+++ b/arch/arm/mm/cache-v4wb.S
@@ -7,7 +7,6 @@
 #include <linux/linkage.h>
 #include <linux/init.h>
 #include <asm/assembler.h>
-#include <asm/memory.h>
 #include <asm/page.h>
 #include "proc-macros.S"
 
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index b4a33358d2e9..0549bee68a67 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -25,7 +25,7 @@
 #include <linux/sizes.h>
 #include <linux/cma.h>
 
-#include <asm/memory.h>
+#include <asm/page.h>
 #include <asm/highmem.h>
 #include <asm/cacheflush.h>
 #include <asm/tlbflush.h>
diff --git a/arch/arm/mm/dump.c b/arch/arm/mm/dump.c
index 059eb4cdc9c2..a9381095ab36 100644
--- a/arch/arm/mm/dump.c
+++ b/arch/arm/mm/dump.c
@@ -15,7 +15,7 @@
 
 #include <asm/domain.h>
 #include <asm/fixmap.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 #include <asm/ptdump.h>
 
 static struct addr_marker address_markers[] = {
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index ce64bdb55a16..a42e4cd11db2 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -26,7 +26,7 @@
 #include <asm/cp15.h>
 #include <asm/mach-types.h>
 #include <asm/memblock.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 #include <asm/prom.h>
 #include <asm/sections.h>
 #include <asm/setup.h>
diff --git a/arch/arm/mm/kasan_init.c b/arch/arm/mm/kasan_init.c
index 46d9f4a622cb..24d71b5db62d 100644
--- a/arch/arm/mm/kasan_init.c
+++ b/arch/arm/mm/kasan_init.c
@@ -17,7 +17,6 @@
 #include <asm/cputype.h>
 #include <asm/highmem.h>
 #include <asm/mach/map.h>
-#include <asm/memory.h>
 #include <asm/page.h>
 #include <asm/pgalloc.h>
 #include <asm/procinfo.h>
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 463fc2a8448f..22292cf3381c 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -26,7 +26,7 @@
 #include <asm/system_info.h>
 #include <asm/traps.h>
 #include <asm/procinfo.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 #include <asm/pgalloc.h>
 #include <asm/kasan_def.h>
 
diff --git a/arch/arm/mm/physaddr.c b/arch/arm/mm/physaddr.c
index cf75819e4c13..3f263c840ebc 100644
--- a/arch/arm/mm/physaddr.c
+++ b/arch/arm/mm/physaddr.c
@@ -6,7 +6,7 @@
 #include <linux/mm.h>
 
 #include <asm/sections.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 #include <asm/fixmap.h>
 #include <asm/dma.h>
 
diff --git a/arch/arm/mm/pmsa-v8.c b/arch/arm/mm/pmsa-v8.c
index 8359748a19a1..28cdc5468406 100644
--- a/arch/arm/mm/pmsa-v8.c
+++ b/arch/arm/mm/pmsa-v8.c
@@ -11,7 +11,7 @@
 #include <asm/cputype.h>
 #include <asm/mpu.h>
 
-#include <asm/memory.h>
+#include <asm/page.h>
 #include <asm/sections.h>
 
 #include "mm.h"
diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S
index 6b4ef9539b68..193c7aeb6703 100644
--- a/arch/arm/mm/proc-v7.S
+++ b/arch/arm/mm/proc-v7.S
@@ -14,7 +14,7 @@
 #include <asm/asm-offsets.h>
 #include <asm/hwcap.h>
 #include <asm/pgtable-hwdef.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 
 #include "proc-macros.S"
 
diff --git a/arch/arm/mm/proc-v7m.S b/arch/arm/mm/proc-v7m.S
index 335144d50134..d65a12f851a9 100644
--- a/arch/arm/mm/proc-v7m.S
+++ b/arch/arm/mm/proc-v7m.S
@@ -9,7 +9,7 @@
  */
 #include <linux/linkage.h>
 #include <asm/assembler.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 #include <asm/v7m.h>
 #include "proc-macros.S"
 
diff --git a/arch/arm/mm/pv-fixup-asm.S b/arch/arm/mm/pv-fixup-asm.S
index f8e11f7c7880..1d9f52c71ad0 100644
--- a/arch/arm/mm/pv-fixup-asm.S
+++ b/arch/arm/mm/pv-fixup-asm.S
@@ -9,7 +9,7 @@
 #include <linux/pgtable.h>
 #include <asm/asm-offsets.h>
 #include <asm/cp15.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 
 	.section ".idmap.text", "ax"
 
diff --git a/drivers/memory/ti-emif-sram-pm.S b/drivers/memory/ti-emif-sram-pm.S
index d60a8cfd63f3..7756b3971244 100644
--- a/drivers/memory/ti-emif-sram-pm.S
+++ b/drivers/memory/ti-emif-sram-pm.S
@@ -8,7 +8,7 @@
 
 #include <linux/linkage.h>
 #include <asm/assembler.h>
-#include <asm/memory.h>
+#include <asm/page.h>
 
 #include "emif.h"
 #include "ti-emif-asm-offsets.h"

-- 
2.34.1

[PATCH v3 11/12] arm64: memory: 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.

Since arm64 is using <asm-generic/memory_model.h> to provide
__phys_to_pfn() we need to move the inclusion of that header
up, so we can resolve the static inline at compile time.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 arch/arm64/include/asm/memory.h | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index c735afdf639b..4d85212b622e 100644
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -331,6 +331,14 @@ static inline void *phys_to_virt(phys_addr_t x)
 	return (void *)(__phys_to_virt(x));
 }
 
+/* Needed already here for resolving __phys_to_pfn() in virt_to_pfn() */
+#include <asm-generic/memory_model.h>
+
+static inline unsigned long virt_to_pfn(const void *kaddr)
+{
+	return __phys_to_pfn(virt_to_phys(kaddr));
+}
+
 /*
  * Drivers should NOT use these either.
  */
@@ -339,7 +347,6 @@ static inline void *phys_to_virt(phys_addr_t x)
 #define __pa_nodebug(x)		__virt_to_phys_nodebug((unsigned long)(x))
 #define __va(x)			((void *)__phys_to_virt((phys_addr_t)(x)))
 #define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)
-#define virt_to_pfn(x)		__phys_to_pfn(__virt_to_phys((unsigned long)(x)))
 #define sym_to_pfn(x)		__phys_to_pfn(__pa_symbol(x))
 
 /*

-- 
2.34.1

[PATCH v3 12/12] m68k/mm: Make pfn accessors static 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().

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 arch/m68k/include/asm/page_mm.h | 11 +++++++++--
 arch/m68k/include/asm/page_no.h | 11 +++++++++--
 2 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/arch/m68k/include/asm/page_mm.h b/arch/m68k/include/asm/page_mm.h
index 3903db2e8da7..363aa0f9ba8a 100644
--- a/arch/m68k/include/asm/page_mm.h
+++ b/arch/m68k/include/asm/page_mm.h
@@ -121,8 +121,15 @@ static inline void *__va(unsigned long x)
  * TODO: implement (fast) pfn<->pgdat_idx conversion functions, this makes lots
  * of the shifts unnecessary.
  */
-#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 __va(pfn << PAGE_SHIFT);
+}
 
 extern int m68k_virt_to_node_shift;
 
diff --git a/arch/m68k/include/asm/page_no.h b/arch/m68k/include/asm/page_no.h
index 060e4c0e7605..af3a10973233 100644
--- a/arch/m68k/include/asm/page_no.h
+++ b/arch/m68k/include/asm/page_no.h
@@ -19,8 +19,15 @@ extern unsigned long memory_end;
 #define __pa(vaddr)		((unsigned long)(vaddr))
 #define __va(paddr)		((void *)((unsigned long)(paddr)))
 
-#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 __va(pfn << PAGE_SHIFT);
+}
 
 #define virt_to_page(addr)	(mem_map + (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT))
 #define page_to_virt(page)	__va(((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET))

-- 
2.34.1

Re: [PATCH v3 02/12] m68k: Pass a pointer to virt_to_pfn() virt_to_page()

[Geert Uytterhoeven]

Hi Linus,

On Tue, May 23, 2023 at 4:05 PM Linus Walleij <linus.walleij@linaro.org> wrote:
> Functions that work on a pointer to virtual memory such as
> virt_to_pfn() and users of that function such as
> virt_to_page() are supposed to pass a pointer to virtual
> memory, ideally a (void *) or other pointer. However since
> many architectures implement virt_to_pfn() as a macro,
> this function becomes polymorphic and accepts both a
> (unsigned long) and a (void *).
>
> Fix up the offending calls in arch/m68k with explicit casts.
>
> The page table include <asm/pgtable.h> will include different
> variants of the defines depending on whether you build for
> classic m68k, ColdFire or Sun3, so fix all variants.
>
> Tested-by: Geert Uytterhoeven <geert@linux-m68k.org>
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Thanks for your patch!

> ---
> ChangeLog v2->v3:
> - Fix up versioning. This is v3.
> - Let Coldfire __pte_page() return a (void *) instead of __va
> - Delete Coldfire pte_pagenr() which was using unsigned long
>   semantics from __pte_page()

You may want to mention this removal in the patch descriptin.

> - Drop ill-advised change to Coldfire pmd_page_vaddr()

> --- a/arch/m68k/include/asm/sun3_pgtable.h
> +++ b/arch/m68k/include/asm/sun3_pgtable.h

> @@ -111,7 +111,7 @@ static inline void pte_clear (struct mm_struct *mm, unsigned long addr, pte_t *p
>
>  #define pte_page(pte)          virt_to_page(__pte_page(pte))
>  #define pmd_pfn(pmd)           (pmd_val(pmd) >> 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))

There's an extra space between "void" and "*".

Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [PATCH v3 12/12] m68k/mm: Make pfn accessors static inlines

[Geert Uytterhoeven]

On Tue, May 23, 2023 at 4:05 PM Linus Walleij <linus.walleij@linaro.org> wrote:
> 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().
>
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds