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authorAnshuman Khandual <anshuman.khandual@arm.com>2021-07-01 04:53:13 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2021-07-01 21:06:02 +0300
commitfac7757e1fb05b75c8e22d4f8fe2f6c9c4d7edca (patch)
tree9ef980d5f52a5e51358f473440bbe423e02fc33f
parentc4ffefd16daba0f29fa7d9534de20949b673eca0 (diff)
downloadlinux-fac7757e1fb05b75c8e22d4f8fe2f6c9c4d7edca.tar.xz
mm: define default value for FIRST_USER_ADDRESS
Currently most platforms define FIRST_USER_ADDRESS as 0UL duplication the same code all over. Instead just define a generic default value (i.e 0UL) for FIRST_USER_ADDRESS and let the platforms override when required. This makes it much cleaner with reduced code. The default FIRST_USER_ADDRESS here would be skipped in <linux/pgtable.h> when the given platform overrides its value via <asm/pgtable.h>. Link: https://lkml.kernel.org/r/1620615725-24623-1-git-send-email-anshuman.khandual@arm.com Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> [m68k] Acked-by: Guo Ren <guoren@kernel.org> [csky] Acked-by: Stafford Horne <shorne@gmail.com> [openrisc] Acked-by: Catalin Marinas <catalin.marinas@arm.com> [arm64] Acked-by: Mike Rapoport <rppt@linux.ibm.com> Acked-by: Palmer Dabbelt <palmerdabbelt@google.com> [RISC-V] Cc: Richard Henderson <rth@twiddle.net> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org> Cc: Guo Ren <guoren@kernel.org> Cc: Brian Cain <bcain@codeaurora.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Michal Simek <monstr@monstr.eu> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Ley Foon Tan <ley.foon.tan@intel.com> Cc: Jonas Bonn <jonas@southpole.se> Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi> Cc: Stafford Horne <shorne@gmail.com> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: "David S. Miller" <davem@davemloft.net> Cc: Jeff Dike <jdike@addtoit.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Chris Zankel <chris@zankel.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--arch/alpha/include/asm/pgtable.h1
-rw-r--r--arch/arc/include/asm/pgtable.h6
-rw-r--r--arch/arm64/include/asm/pgtable.h2
-rw-r--r--arch/csky/include/asm/pgtable.h1
-rw-r--r--arch/hexagon/include/asm/pgtable.h3
-rw-r--r--arch/ia64/include/asm/pgtable.h1
-rw-r--r--arch/m68k/include/asm/pgtable_mm.h1
-rw-r--r--arch/microblaze/include/asm/pgtable.h2
-rw-r--r--arch/mips/include/asm/pgtable-32.h1
-rw-r--r--arch/mips/include/asm/pgtable-64.h1
-rw-r--r--arch/nios2/include/asm/pgtable.h2
-rw-r--r--arch/openrisc/include/asm/pgtable.h1
-rw-r--r--arch/parisc/include/asm/pgtable.h2
-rw-r--r--arch/powerpc/include/asm/book3s/pgtable.h1
-rw-r--r--arch/powerpc/include/asm/nohash/32/pgtable.h1
-rw-r--r--arch/powerpc/include/asm/nohash/64/pgtable.h2
-rw-r--r--arch/riscv/include/asm/pgtable.h2
-rw-r--r--arch/s390/include/asm/pgtable.h2
-rw-r--r--arch/sh/include/asm/pgtable.h2
-rw-r--r--arch/sparc/include/asm/pgtable_32.h1
-rw-r--r--arch/sparc/include/asm/pgtable_64.h3
-rw-r--r--arch/um/include/asm/pgtable-2level.h1
-rw-r--r--arch/um/include/asm/pgtable-3level.h1
-rw-r--r--arch/x86/include/asm/pgtable_types.h2
-rw-r--r--arch/xtensa/include/asm/pgtable.h1
-rw-r--r--include/linux/pgtable.h9
26 files changed, 9 insertions, 43 deletions
diff --git a/arch/alpha/include/asm/pgtable.h b/arch/alpha/include/asm/pgtable.h
index e1757b7cfe3d..ff690846465e 100644
--- a/arch/alpha/include/asm/pgtable.h
+++ b/arch/alpha/include/asm/pgtable.h
@@ -46,7 +46,6 @@ struct vm_area_struct;
#define PTRS_PER_PMD (1UL << (PAGE_SHIFT-3))
#define PTRS_PER_PGD (1UL << (PAGE_SHIFT-3))
#define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
-#define FIRST_USER_ADDRESS 0UL
/* Number of pointers that fit on a page: this will go away. */
#define PTRS_PER_PAGE (1UL << (PAGE_SHIFT-3))
diff --git a/arch/arc/include/asm/pgtable.h b/arch/arc/include/asm/pgtable.h
index 5878846f00cf..577682e8cc7f 100644
--- a/arch/arc/include/asm/pgtable.h
+++ b/arch/arc/include/asm/pgtable.h
@@ -222,12 +222,6 @@
*/
#define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
-/*
- * No special requirements for lowest virtual address we permit any user space
- * mapping to be mapped at.
- */
-#define FIRST_USER_ADDRESS 0UL
-
/****************************************************************
* Bucket load of VM Helpers
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 0b10204e72fc..25f5c04b43ce 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -26,8 +26,6 @@
#define vmemmap ((struct page *)VMEMMAP_START - (memstart_addr >> PAGE_SHIFT))
-#define FIRST_USER_ADDRESS 0UL
-
#ifndef __ASSEMBLY__
#include <asm/cmpxchg.h>
diff --git a/arch/csky/include/asm/pgtable.h b/arch/csky/include/asm/pgtable.h
index 0d60367b6bfa..151607ed5158 100644
--- a/arch/csky/include/asm/pgtable.h
+++ b/arch/csky/include/asm/pgtable.h
@@ -14,7 +14,6 @@
#define PGDIR_MASK (~(PGDIR_SIZE-1))
#define USER_PTRS_PER_PGD (PAGE_OFFSET/PGDIR_SIZE)
-#define FIRST_USER_ADDRESS 0UL
/*
* C-SKY is two-level paging structure:
diff --git a/arch/hexagon/include/asm/pgtable.h b/arch/hexagon/include/asm/pgtable.h
index dbb22b80b8c4..e4979508cddf 100644
--- a/arch/hexagon/include/asm/pgtable.h
+++ b/arch/hexagon/include/asm/pgtable.h
@@ -155,9 +155,6 @@ extern unsigned long _dflt_cache_att;
extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; /* located in head.S */
-/* Seems to be zero even in architectures where the zero page is firewalled? */
-#define FIRST_USER_ADDRESS 0UL
-
/* HUGETLB not working currently */
#ifdef CONFIG_HUGETLB_PAGE
#define pte_mkhuge(pte) __pte((pte_val(pte) & ~0x3) | HVM_HUGEPAGE_SIZE)
diff --git a/arch/ia64/include/asm/pgtable.h b/arch/ia64/include/asm/pgtable.h
index d765fd948fae..3f5dbbd8b9d8 100644
--- a/arch/ia64/include/asm/pgtable.h
+++ b/arch/ia64/include/asm/pgtable.h
@@ -128,7 +128,6 @@
#define PTRS_PER_PGD_SHIFT PTRS_PER_PTD_SHIFT
#define PTRS_PER_PGD (1UL << PTRS_PER_PGD_SHIFT)
#define USER_PTRS_PER_PGD (5*PTRS_PER_PGD/8) /* regions 0-4 are user regions */
-#define FIRST_USER_ADDRESS 0UL
/*
* All the normal masks have the "page accessed" bits on, as any time
diff --git a/arch/m68k/include/asm/pgtable_mm.h b/arch/m68k/include/asm/pgtable_mm.h
index aca22c2c1ee2..143ba7de9bda 100644
--- a/arch/m68k/include/asm/pgtable_mm.h
+++ b/arch/m68k/include/asm/pgtable_mm.h
@@ -72,7 +72,6 @@
#define PTRS_PER_PGD 128
#endif
#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
-#define FIRST_USER_ADDRESS 0UL
/* Virtual address region for use by kernel_map() */
#ifdef CONFIG_SUN3
diff --git a/arch/microblaze/include/asm/pgtable.h b/arch/microblaze/include/asm/pgtable.h
index 9ae8d2c17dd5..71cd547655d9 100644
--- a/arch/microblaze/include/asm/pgtable.h
+++ b/arch/microblaze/include/asm/pgtable.h
@@ -25,8 +25,6 @@ extern int mem_init_done;
#include <asm/mmu.h>
#include <asm/page.h>
-#define FIRST_USER_ADDRESS 0UL
-
extern unsigned long va_to_phys(unsigned long address);
extern pte_t *va_to_pte(unsigned long address);
diff --git a/arch/mips/include/asm/pgtable-32.h b/arch/mips/include/asm/pgtable-32.h
index 6c0532d7b211..95df9c293d8d 100644
--- a/arch/mips/include/asm/pgtable-32.h
+++ b/arch/mips/include/asm/pgtable-32.h
@@ -93,7 +93,6 @@ extern int add_temporary_entry(unsigned long entrylo0, unsigned long entrylo1,
#endif
#define USER_PTRS_PER_PGD (0x80000000UL/PGDIR_SIZE)
-#define FIRST_USER_ADDRESS 0UL
#define VMALLOC_START MAP_BASE
diff --git a/arch/mips/include/asm/pgtable-64.h b/arch/mips/include/asm/pgtable-64.h
index 1e7d6ce9d8d6..046465906c82 100644
--- a/arch/mips/include/asm/pgtable-64.h
+++ b/arch/mips/include/asm/pgtable-64.h
@@ -137,7 +137,6 @@
#define PTRS_PER_PTE ((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t))
#define USER_PTRS_PER_PGD ((TASK_SIZE64 / PGDIR_SIZE)?(TASK_SIZE64 / PGDIR_SIZE):1)
-#define FIRST_USER_ADDRESS 0UL
/*
* TLB refill handlers also map the vmalloc area into xuseg. Avoid
diff --git a/arch/nios2/include/asm/pgtable.h b/arch/nios2/include/asm/pgtable.h
index 2600d76c310c..4a995fa628ee 100644
--- a/arch/nios2/include/asm/pgtable.h
+++ b/arch/nios2/include/asm/pgtable.h
@@ -24,8 +24,6 @@
#include <asm/pgtable-bits.h>
#include <asm-generic/pgtable-nopmd.h>
-#define FIRST_USER_ADDRESS 0UL
-
#define VMALLOC_START CONFIG_NIOS2_KERNEL_MMU_REGION_BASE
#define VMALLOC_END (CONFIG_NIOS2_KERNEL_REGION_BASE - 1)
diff --git a/arch/openrisc/include/asm/pgtable.h b/arch/openrisc/include/asm/pgtable.h
index 9425bedab4fc..4ac591c9ca33 100644
--- a/arch/openrisc/include/asm/pgtable.h
+++ b/arch/openrisc/include/asm/pgtable.h
@@ -73,7 +73,6 @@ extern void paging_init(void);
*/
#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
-#define FIRST_USER_ADDRESS 0UL
/*
* Kernels own virtual memory area.
diff --git a/arch/parisc/include/asm/pgtable.h b/arch/parisc/include/asm/pgtable.h
index 39017210dbf0..7f33c29764cc 100644
--- a/arch/parisc/include/asm/pgtable.h
+++ b/arch/parisc/include/asm/pgtable.h
@@ -171,8 +171,6 @@ static inline void purge_tlb_entries(struct mm_struct *mm, unsigned long addr)
* pgd entries used up by user/kernel:
*/
-#define FIRST_USER_ADDRESS 0UL
-
/* NB: The tlb miss handlers make certain assumptions about the order */
/* of the following bits, so be careful (One example, bits 25-31 */
/* are moved together in one instruction). */
diff --git a/arch/powerpc/include/asm/book3s/pgtable.h b/arch/powerpc/include/asm/book3s/pgtable.h
index 0e1263455d73..ad130e15a126 100644
--- a/arch/powerpc/include/asm/book3s/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/pgtable.h
@@ -8,7 +8,6 @@
#include <asm/book3s/32/pgtable.h>
#endif
-#define FIRST_USER_ADDRESS 0UL
#ifndef __ASSEMBLY__
/* Insert a PTE, top-level function is out of line. It uses an inline
* low level function in the respective pgtable-* files
diff --git a/arch/powerpc/include/asm/nohash/32/pgtable.h b/arch/powerpc/include/asm/nohash/32/pgtable.h
index 96522f7f0618..f06ae00f2a65 100644
--- a/arch/powerpc/include/asm/nohash/32/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/32/pgtable.h
@@ -54,7 +54,6 @@ extern int icache_44x_need_flush;
#define PGD_MASKED_BITS 0
#define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
-#define FIRST_USER_ADDRESS 0UL
#define pte_ERROR(e) \
pr_err("%s:%d: bad pte %llx.\n", __FILE__, __LINE__, \
diff --git a/arch/powerpc/include/asm/nohash/64/pgtable.h b/arch/powerpc/include/asm/nohash/64/pgtable.h
index 57cd3892bfe0..53fbfdfac93d 100644
--- a/arch/powerpc/include/asm/nohash/64/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/64/pgtable.h
@@ -12,8 +12,6 @@
#include <asm/barrier.h>
#include <asm/asm-const.h>
-#define FIRST_USER_ADDRESS 0UL
-
/*
* Size of EA range mapped by our pagetables.
*/
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index 380cd3a7e548..62f3fe7368f3 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -536,8 +536,6 @@ void setup_bootmem(void);
void paging_init(void);
void misc_mem_init(void);
-#define FIRST_USER_ADDRESS 0
-
/*
* ZERO_PAGE is a global shared page that is always zero,
* used for zero-mapped memory areas, etc.
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index b38f7b781564..7c86bf03fc8f 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -65,8 +65,6 @@ extern unsigned long zero_page_mask;
/* TODO: s390 cannot support io_remap_pfn_range... */
-#define FIRST_USER_ADDRESS 0UL
-
#define pte_ERROR(e) \
printk("%s:%d: bad pte %p.\n", __FILE__, __LINE__, (void *) pte_val(e))
#define pmd_ERROR(e) \
diff --git a/arch/sh/include/asm/pgtable.h b/arch/sh/include/asm/pgtable.h
index 27751e9470df..d7ddb1ec86a0 100644
--- a/arch/sh/include/asm/pgtable.h
+++ b/arch/sh/include/asm/pgtable.h
@@ -59,8 +59,6 @@ static inline unsigned long long neff_sign_extend(unsigned long val)
/* Entries per level */
#define PTRS_PER_PTE (PAGE_SIZE / (1 << PTE_MAGNITUDE))
-#define FIRST_USER_ADDRESS 0UL
-
#define PHYS_ADDR_MASK29 0x1fffffff
#define PHYS_ADDR_MASK32 0xffffffff
diff --git a/arch/sparc/include/asm/pgtable_32.h b/arch/sparc/include/asm/pgtable_32.h
index a5cf79c149fe..0888bda245f5 100644
--- a/arch/sparc/include/asm/pgtable_32.h
+++ b/arch/sparc/include/asm/pgtable_32.h
@@ -48,7 +48,6 @@ unsigned long __init bootmem_init(unsigned long *pages_avail);
#define PTRS_PER_PMD 64
#define PTRS_PER_PGD 256
#define USER_PTRS_PER_PGD PAGE_OFFSET / PGDIR_SIZE
-#define FIRST_USER_ADDRESS 0UL
#define PTE_SIZE (PTRS_PER_PTE*4)
#define PAGE_NONE SRMMU_PAGE_NONE
diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h
index 2cd80a0a9795..a400e0f23046 100644
--- a/arch/sparc/include/asm/pgtable_64.h
+++ b/arch/sparc/include/asm/pgtable_64.h
@@ -95,9 +95,6 @@ bool kern_addr_valid(unsigned long addr);
#define PTRS_PER_PUD (1UL << PUD_BITS)
#define PTRS_PER_PGD (1UL << PGDIR_BITS)
-/* Kernel has a separate 44bit address space. */
-#define FIRST_USER_ADDRESS 0UL
-
#define pmd_ERROR(e) \
pr_err("%s:%d: bad pmd %p(%016lx) seen at (%pS)\n", \
__FILE__, __LINE__, &(e), pmd_val(e), __builtin_return_address(0))
diff --git a/arch/um/include/asm/pgtable-2level.h b/arch/um/include/asm/pgtable-2level.h
index 32106d31e4ab..8256ecc5b919 100644
--- a/arch/um/include/asm/pgtable-2level.h
+++ b/arch/um/include/asm/pgtable-2level.h
@@ -23,7 +23,6 @@
#define PTRS_PER_PTE 1024
#define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
#define PTRS_PER_PGD 1024
-#define FIRST_USER_ADDRESS 0UL
#define pte_ERROR(e) \
printk("%s:%d: bad pte %p(%08lx).\n", __FILE__, __LINE__, &(e), \
diff --git a/arch/um/include/asm/pgtable-3level.h b/arch/um/include/asm/pgtable-3level.h
index 7e6a4180db9d..9289a86643a9 100644
--- a/arch/um/include/asm/pgtable-3level.h
+++ b/arch/um/include/asm/pgtable-3level.h
@@ -41,7 +41,6 @@
#endif
#define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
-#define FIRST_USER_ADDRESS 0UL
#define pte_ERROR(e) \
printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), \
diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h
index f24d7ef8fffa..40497a9020c6 100644
--- a/arch/x86/include/asm/pgtable_types.h
+++ b/arch/x86/include/asm/pgtable_types.h
@@ -7,8 +7,6 @@
#include <asm/page_types.h>
-#define FIRST_USER_ADDRESS 0UL
-
#define _PAGE_BIT_PRESENT 0 /* is present */
#define _PAGE_BIT_RW 1 /* writeable */
#define _PAGE_BIT_USER 2 /* userspace addressable */
diff --git a/arch/xtensa/include/asm/pgtable.h b/arch/xtensa/include/asm/pgtable.h
index d7fc45c920c2..bd5aeb795567 100644
--- a/arch/xtensa/include/asm/pgtable.h
+++ b/arch/xtensa/include/asm/pgtable.h
@@ -59,7 +59,6 @@
#define PTRS_PER_PGD 1024
#define PGD_ORDER 0
#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
-#define FIRST_USER_ADDRESS 0UL
#define FIRST_USER_PGD_NR (FIRST_USER_ADDRESS >> PGDIR_SHIFT)
#ifdef CONFIG_MMU
diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index 2b0d02291178..69700e3e615f 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -29,6 +29,15 @@
#endif
/*
+ * This defines the first usable user address. Platforms
+ * can override its value with custom FIRST_USER_ADDRESS
+ * defined in their respective <asm/pgtable.h>.
+ */
+#ifndef FIRST_USER_ADDRESS
+#define FIRST_USER_ADDRESS 0UL
+#endif
+
+/*
* A page table page can be thought of an array like this: pXd_t[PTRS_PER_PxD]
*
* The pXx_index() functions return the index of the entry in the page