Merge tag 'virt-to-pfn-for-arch-v6.5-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-integrator into asm-generic

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:

- 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 architectures 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.
New added or deeply hidden problems appear all the time so
some minor fallout can be expected.

* tag 'virt-to-pfn-for-arch-v6.5-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-integrator:
  m68k/mm: Make pfn accessors static inlines
  arm64: memory: Make virt_to_pfn() a static inline
  ARM: mm: Make virt_to_pfn() a static inline
  asm-generic/page.h: Make pfn accessors static inlines
  xen/netback: Pass (void *) to virt_to_page()
  netfs: Pass a pointer to virt_to_page()
  cifs: Pass a pointer to virt_to_page() in cifsglob
  cifs: Pass a pointer to virt_to_page()
  riscv: mm: init: Pass a pointer to virt_to_page()
  ARC: init: Pass a pointer to virt_to_pfn() in init
  m68k: Pass a pointer to virt_to_pfn() virt_to_page()
  fs/proc/kcore.c: Pass a pointer to virt_addr_valid()

64 files changed, 108 insertions, 80 deletions

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);
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>