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
when the given platform overrides its value via .
Cc: Richard Henderson
Cc: Vineet Gupta
Cc: Catalin Marinas
Cc: Will Deacon
Cc: Guo Ren
Cc: Brian Cain
Cc: Geert Uytterhoeven
Cc: Michal Simek
Cc: Thomas Bogendoerfer
Cc: Ley Foon Tan
Cc: Jonas Bonn
Cc: Stefan Kristiansson
Cc: Stafford Horne
Cc: "James E.J. Bottomley"
Cc: Michael Ellerman
Cc: Christophe Leroy
Cc: Paul Walmsley
Cc: Palmer Dabbelt
Cc: Heiko Carstens
Cc: Yoshinori Sato
Cc: "David S. Miller"
Cc: Jeff Dike
Cc: Thomas Gleixner
Cc: Chris Zankel
Cc: Andrew Morton
Cc: linux-a...@vger.kernel.org
Cc: linux...@kvack.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Anshuman Khandual
---
This applies on v5.12-rc7 and has been boot tested on arm64 platform.
But has been cross compiled on multiple other platforms.
Changes in V2:
- Dropped ARCH_HAS_FIRST_USER_ADDRESS construct
Changes in V1:
https://patchwork.kernel.org/project/linux-mm/patch/1618368899-20311-1-git-send-email-anshuman.khand...@arm.com/
arch/alpha/include/asm/pgtable.h | 1 -
arch/arc/include/asm/pgtable.h | 6 --
arch/arm64/include/asm/pgtable.h | 2 --
arch/csky/include/asm/pgtable.h | 1 -
arch/hexagon/include/asm/pgtable.h | 3 ---
arch/ia64/include/asm/pgtable.h | 1 -
arch/m68k/include/asm/pgtable_mm.h | 1 -
arch/microblaze/include/asm/pgtable.h| 2 --
arch/mips/include/asm/pgtable-32.h | 1 -
arch/mips/include/asm/pgtable-64.h | 1 -
arch/nios2/include/asm/pgtable.h | 2 --
arch/openrisc/include/asm/pgtable.h | 1 -
arch/parisc/include/asm/pgtable.h| 2 --
arch/powerpc/include/asm/book3s/pgtable.h| 1 -
arch/powerpc/include/asm/nohash/32/pgtable.h | 1 -
arch/powerpc/include/asm/nohash/64/pgtable.h | 2 --
arch/riscv/include/asm/pgtable.h | 2 --
arch/s390/include/asm/pgtable.h | 2 --
arch/sh/include/asm/pgtable.h| 2 --
arch/sparc/include/asm/pgtable_32.h | 1 -
arch/sparc/include/asm/pgtable_64.h | 3 ---
arch/um/include/asm/pgtable-2level.h | 1 -
arch/um/include/asm/pgtable-3level.h | 1 -
arch/x86/include/asm/pgtable_types.h | 2 --
arch/xtensa/include/asm/pgtable.h| 1 -
include/linux/pgtable.h | 9 +
26 files changed, 9 insertions(+), 43 deletions(-)
diff --git a/arch/alpha/include/asm/pgtable.h b/arch/alpha/include/asm/pgtable.h
index 8d856c62e22a..1a2fb0dc905b 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 163641726a2b..a9fabfb70664 100644
--- a/arch/arc/include/asm/pgtable.h
+++ b/arch/arc/include/asm/pgtable.h
@@ -228,12 +228,6 @@
*/
#defineUSER_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 47027796c2f9..f6ab8b64967e 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
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
