arch: simplify architecture specific page size configuration

arc, arm64, parisc and powerpc all have their own Kconfig symbols
in place of the common CONFIG_PAGE_SIZE_4KB symbols. Change these
so the common symbols are the ones that are actually used, while
leaving the arhcitecture specific ones as the user visible
place for configuring it, to avoid breaking user configs.

Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu> (powerpc32)
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Helge Deller <deller@gmx.de> # parisc
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arc/Kconfig

@@ -284,14 +284,17 @@ choice
 
 config ARC_PAGE_SIZE_8K
 	bool "8KB"
+	select HAVE_PAGE_SIZE_8KB
 	help
 	  Choose between 8k vs 16k
 
 config ARC_PAGE_SIZE_16K
+	select HAVE_PAGE_SIZE_16KB
 	bool "16KB"
 
 config ARC_PAGE_SIZE_4K
 	bool "4KB"
+	select HAVE_PAGE_SIZE_4KB
 	depends on ARC_MMU_V3 || ARC_MMU_V4
 
 endchoice

arch/arc/include/uapi/asm/page.h

@@ -13,10 +13,8 @@
 #include <linux/const.h>
 
 /* PAGE_SHIFT determines the page size */
-#if defined(CONFIG_ARC_PAGE_SIZE_16K)
-#define PAGE_SHIFT 14
-#elif defined(CONFIG_ARC_PAGE_SIZE_4K)
-#define PAGE_SHIFT 12
+#ifdef __KERNEL__
+#define PAGE_SHIFT CONFIG_PAGE_SHIFT
 #else
 /*
  * Default 8k

arch/arm64/Kconfig

@@ -277,27 +277,21 @@ config 64BIT
 config MMU
 	def_bool y
 
-config ARM64_PAGE_SHIFT
-	int
-	default 16 if ARM64_64K_PAGES
-	default 14 if ARM64_16K_PAGES
-	default 12
-
 config ARM64_CONT_PTE_SHIFT
 	int
-	default 5 if ARM64_64K_PAGES
-	default 7 if ARM64_16K_PAGES
+	default 5 if PAGE_SIZE_64KB
+	default 7 if PAGE_SIZE_16KB
 	default 4
 
 config ARM64_CONT_PMD_SHIFT
 	int
-	default 5 if ARM64_64K_PAGES
-	default 5 if ARM64_16K_PAGES
+	default 5 if PAGE_SIZE_64KB
+	default 5 if PAGE_SIZE_16KB
 	default 4
 
 config ARCH_MMAP_RND_BITS_MIN
-	default 14 if ARM64_64K_PAGES
-	default 16 if ARM64_16K_PAGES
+	default 14 if PAGE_SIZE_64KB
+	default 16 if PAGE_SIZE_16KB
 	default 18
 
 # max bits determined by the following formula:
@@ -1259,11 +1253,13 @@ choice
 
 config ARM64_4K_PAGES
 	bool "4KB"
+	select HAVE_PAGE_SIZE_4KB
 	help
 	  This feature enables 4KB pages support.
 
 config ARM64_16K_PAGES
 	bool "16KB"
+	select HAVE_PAGE_SIZE_16KB
 	help
 	  The system will use 16KB pages support. AArch32 emulation
 	  requires applications compiled with 16K (or a multiple of 16K)
@@ -1271,6 +1267,7 @@ config ARM64_16K_PAGES
 
 config ARM64_64K_PAGES
 	bool "64KB"
+	select HAVE_PAGE_SIZE_64KB
 	help
 	  This feature enables 64KB pages support (4KB by default)
 	  allowing only two levels of page tables and faster TLB
@@ -1291,19 +1288,19 @@ choice
 
 config ARM64_VA_BITS_36
 	bool "36-bit" if EXPERT
-	depends on ARM64_16K_PAGES
+	depends on PAGE_SIZE_16KB
 
 config ARM64_VA_BITS_39
 	bool "39-bit"
-	depends on ARM64_4K_PAGES
+	depends on PAGE_SIZE_4KB
 
 config ARM64_VA_BITS_42
 	bool "42-bit"
-	depends on ARM64_64K_PAGES
+	depends on PAGE_SIZE_64KB
 
 config ARM64_VA_BITS_47
 	bool "47-bit"
-	depends on ARM64_16K_PAGES
+	depends on PAGE_SIZE_16KB
 
 config ARM64_VA_BITS_48
 	bool "48-bit"

arch/arm64/include/asm/page-def.h

@@ -11,7 +11,7 @@
 #include <linux/const.h>
 
 /* PAGE_SHIFT determines the page size */
-#define PAGE_SHIFT		CONFIG_ARM64_PAGE_SHIFT
+#define PAGE_SHIFT		CONFIG_PAGE_SHIFT
 #define PAGE_SIZE		(_AC(1, UL) << PAGE_SHIFT)
 #define PAGE_MASK		(~(PAGE_SIZE-1))
 

arch/parisc/Kconfig

@@ -273,6 +273,7 @@ choice
 
 config PARISC_PAGE_SIZE_4KB
 	bool "4KB"
+	select HAVE_PAGE_SIZE_4KB
 	help
 	  This lets you select the page size of the kernel.  For best
 	  performance, a page size of 16KB is recommended.  For best
@@ -288,10 +289,12 @@ config PARISC_PAGE_SIZE_4KB
 
 config PARISC_PAGE_SIZE_16KB
 	bool "16KB"
+	select HAVE_PAGE_SIZE_16KB
 	depends on PA8X00 && BROKEN && !KFENCE
 
 config PARISC_PAGE_SIZE_64KB
 	bool "64KB"
+	select HAVE_PAGE_SIZE_64KB
 	depends on PA8X00 && BROKEN && !KFENCE
 
 endchoice

arch/parisc/include/asm/page.h

@@ -4,15 +4,7 @@
 
 #include <linux/const.h>
 
-#if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
-# define PAGE_SHIFT	12
-#elif defined(CONFIG_PARISC_PAGE_SIZE_16KB)
-# define PAGE_SHIFT	14
-#elif defined(CONFIG_PARISC_PAGE_SIZE_64KB)
-# define PAGE_SHIFT	16
-#else
-# error "unknown default kernel page size"
-#endif
+#define PAGE_SHIFT	CONFIG_PAGE_SHIFT
 #define PAGE_SIZE	(_AC(1,UL) << PAGE_SHIFT)
 #define PAGE_MASK	(~(PAGE_SIZE-1))
 

arch/powerpc/Kconfig

@@ -212,7 +212,7 @@ config PPC
 	select HAVE_ARCH_HUGE_VMAP		if PPC_RADIX_MMU || PPC_8xx
 	select HAVE_ARCH_JUMP_LABEL
 	select HAVE_ARCH_JUMP_LABEL_RELATIVE
-	select HAVE_ARCH_KASAN			if PPC32 && PPC_PAGE_SHIFT <= 14
+	select HAVE_ARCH_KASAN			if PPC32 && PAGE_SHIFT <= 14
 	select HAVE_ARCH_KASAN			if PPC_RADIX_MMU
 	select HAVE_ARCH_KASAN			if PPC_BOOK3E_64
 	select HAVE_ARCH_KASAN_VMALLOC		if HAVE_ARCH_KASAN
@@ -809,19 +809,23 @@ choice
 config PPC_4K_PAGES
 	bool "4k page size"
 	select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
+	select HAVE_PAGE_SIZE_4KB
 
 config PPC_16K_PAGES
 	bool "16k page size"
 	depends on 44x || PPC_8xx
+	select HAVE_PAGE_SIZE_16KB
 
 config PPC_64K_PAGES
 	bool "64k page size"
 	depends on 44x || PPC_BOOK3S_64
 	select HAVE_ARCH_SOFT_DIRTY if PPC_BOOK3S_64
+	select HAVE_PAGE_SIZE_64KB
 
 config PPC_256K_PAGES
 	bool "256k page size (Requires non-standard binutils settings)"
 	depends on 44x && !PPC_47x
+	select HAVE_PAGE_SIZE_256KB
 	help
 	  Make the page size 256k.
 
@@ -832,29 +836,6 @@ config PPC_256K_PAGES
 
 endchoice
 
-config PAGE_SIZE_4KB
-	def_bool y
-	depends on PPC_4K_PAGES
-
-config PAGE_SIZE_16KB
-	def_bool y
-	depends on PPC_16K_PAGES
-
-config PAGE_SIZE_64KB
-	def_bool y
-	depends on PPC_64K_PAGES
-
-config PAGE_SIZE_256KB
-	def_bool y
-	depends on PPC_256K_PAGES
-
-config PPC_PAGE_SHIFT
-	int
-	default 18 if PPC_256K_PAGES
-	default 16 if PPC_64K_PAGES
-	default 14 if PPC_16K_PAGES
-	default 12
-
 config THREAD_SHIFT
 	int "Thread shift" if EXPERT
 	range 13 15
@@ -891,7 +872,7 @@ config DATA_SHIFT
 	default 23 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && PIN_TLB_DATA
 	default 19 if (DEBUG_PAGEALLOC || KFENCE) && PPC_8xx
 	default 24 if STRICT_KERNEL_RWX && PPC_85xx
-	default PPC_PAGE_SHIFT
+	default PAGE_SHIFT
 	help
 	  On Book3S 32 (603+), DBATs are used to map kernel text and rodata RO.
 	  Smaller is the alignment, greater is the number of necessary DBATs.

arch/powerpc/include/asm/page.h

@@ -21,7 +21,7 @@
  * page size. When using 64K pages however, whether we are really supporting
  * 64K pages in HW or not is irrelevant to those definitions.
  */
-#define PAGE_SHIFT		CONFIG_PPC_PAGE_SHIFT
+#define PAGE_SHIFT		CONFIG_PAGE_SHIFT
 #define PAGE_SIZE		(ASM_CONST(1) << PAGE_SHIFT)
 
 #ifndef __ASSEMBLY__

scripts/gdb/linux/constants.py.in

@@ -139,7 +139,7 @@ LX_CONFIG(CONFIG_ARM64_64K_PAGES)
 if IS_BUILTIN(CONFIG_ARM64):
     LX_VALUE(CONFIG_ARM64_PA_BITS)
     LX_VALUE(CONFIG_ARM64_VA_BITS)
-    LX_VALUE(CONFIG_ARM64_PAGE_SHIFT)
+    LX_VALUE(CONFIG_PAGE_SHIFT)
     LX_VALUE(CONFIG_ARCH_FORCE_MAX_ORDER)
 LX_CONFIG(CONFIG_SPARSEMEM)
 LX_CONFIG(CONFIG_SPARSEMEM_EXTREME)

scripts/gdb/linux/mm.py

@@ -41,7 +41,7 @@ class aarch64_page_ops():
             self.SECTION_SIZE_BITS = 27
         self.MAX_PHYSMEM_BITS = constants.LX_CONFIG_ARM64_VA_BITS
 
-        self.PAGE_SHIFT = constants.LX_CONFIG_ARM64_PAGE_SHIFT
+        self.PAGE_SHIFT = constants.LX_CONFIG_PAGE_SHIFT
         self.PAGE_SIZE = 1 << self.PAGE_SHIFT
         self.PAGE_MASK = (~(self.PAGE_SIZE - 1)) & ((1 << 64) - 1)