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mm: remove __ARCH_HAS_5LEVEL_HACK and include/asm-generic/5level-fixup.h 

There are no architectures that use include/asm-generic/5level-fixup.h
therefore it can be removed along with __ARCH_HAS_5LEVEL_HACK define and
the code it surrounds

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Brian Cain <bcain@codeaurora.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christophe Leroy <christophe.leroy@c-s.fr>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Guan Xuetao <gxt@pku.edu.cn>
Cc: James Morse <james.morse@arm.com>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Julien Thierry <julien.thierry.kdev@gmail.com>
Cc: Ley Foon Tan <ley.foon.tan@intel.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Rich Felker <dalias@libc.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Will Deacon <will@kernel.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Link: http://lkml.kernel.org/r/20200414153455.21744-15-rppt@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mike Rapoport 2020-06-04 16:47:08 -07:00 committed by Linus Torvalds
parent ee7767430e
commit f089dcc742
4 changed files with 0 additions and 85 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

59
include/asm-generic/5level-fixup.h
View File

@ -1,59 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _5LEVEL_FIXUP_H
#define _5LEVEL_FIXUP_H
#define __ARCH_HAS_5LEVEL_HACK
#define __PAGETABLE_P4D_FOLDED 1
#define P4D_SHIFT PGDIR_SHIFT
#define P4D_SIZE PGDIR_SIZE
#define P4D_MASK PGDIR_MASK
#define MAX_PTRS_PER_P4D 1
#define PTRS_PER_P4D 1
#define p4d_t pgd_t
#define pud_alloc(mm, p4d, address) \
((unlikely(pgd_none(*(p4d))) && __pud_alloc(mm, p4d, address)) ? \
NULL : pud_offset(p4d, address))
#define p4d_alloc(mm, pgd, address) (pgd)
#define p4d_alloc_track(mm, pgd, address, mask) (pgd)
#define p4d_offset(pgd, start) (pgd)
#ifndef __ASSEMBLY__
static inline int p4d_none(p4d_t p4d)
{
return 0;
}
static inline int p4d_bad(p4d_t p4d)
{
return 0;
}
static inline int p4d_present(p4d_t p4d)
{
return 1;
}
#endif
#define p4d_ERROR(p4d) do { } while (0)
#define p4d_clear(p4d) pgd_clear(p4d)
#define p4d_val(p4d) pgd_val(p4d)
#define p4d_populate(mm, p4d, pud) pgd_populate(mm, p4d, pud)
#define p4d_populate_safe(mm, p4d, pud) pgd_populate(mm, p4d, pud)
#define p4d_page(p4d) pgd_page(p4d)
#define p4d_page_vaddr(p4d) pgd_page_vaddr(p4d)
#define __p4d(x) __pgd(x)
#define set_p4d(p4dp, p4d) set_pgd(p4dp, p4d)
#undef p4d_free_tlb
#define p4d_free_tlb(tlb, x, addr) do { } while (0)
#define p4d_free(mm, x) do { } while (0)
#undef p4d_addr_end
#define p4d_addr_end(addr, end) (end)
#endif

7
include/linux/mm.h
View File

@ -2069,11 +2069,6 @@ int __pte_alloc_kernel(pmd_t *pmd);
#if defined(CONFIG_MMU)
/*
* The following ifdef needed to get the 5level-fixup.h header to work.
* Remove it when 5level-fixup.h has been removed.
*/
#ifndef __ARCH_HAS_5LEVEL_HACK
static inline p4d_t *p4d_alloc(struct mm_struct *mm, pgd_t *pgd,
unsigned long address)
{
@ -2102,8 +2097,6 @@ static inline p4d_t *p4d_alloc_track(struct mm_struct *mm, pgd_t *pgd,
return p4d_offset(pgd, address);
}
#endif /* !__ARCH_HAS_5LEVEL_HACK */
static inline pud_t *pud_alloc_track(struct mm_struct *mm, p4d_t *p4d,
unsigned long address,
pgtbl_mod_mask *mod_mask)

11
mm/kasan/init.c
View File

@ -250,20 +250,9 @@ int __ref kasan_populate_early_shadow(const void *shadow_start,
* 3,2 - level page tables where we don't have
* puds,pmds, so pgd_populate(), pud_populate()
* is noops.
*
* The ifndef is required to avoid build breakage.
*
* With 5level-fixup.h, pgd_populate() is not nop and
* we reference kasan_early_shadow_p4d. It's not defined
* unless 5-level paging enabled.
*
* The ifndef can be dropped once all KASAN-enabled
* architectures will switch to pgtable-nop4d.h.
*/
#ifndef __ARCH_HAS_5LEVEL_HACK
pgd_populate(&init_mm, pgd,
lm_alias(kasan_early_shadow_p4d));
#endif
p4d = p4d_offset(pgd, addr);
p4d_populate(&init_mm, p4d,
lm_alias(kasan_early_shadow_pud));

8
mm/memory.c
View File

@ -4436,19 +4436,11 @@ int __pud_alloc(struct mm_struct *mm, p4d_t *p4d, unsigned long address)
smp_wmb(); /* See comment in __pte_alloc */
spin_lock(&mm->page_table_lock);
#ifndef __ARCH_HAS_5LEVEL_HACK
if (!p4d_present(*p4d)) {
mm_inc_nr_puds(mm);
p4d_populate(mm, p4d, new);
} else /* Another has populated it */
pud_free(mm, new);
#else
if (!pgd_present(*p4d)) {
mm_inc_nr_puds(mm);
pgd_populate(mm, p4d, new);
} else /* Another has populated it */
pud_free(mm, new);
#endif /* __ARCH_HAS_5LEVEL_HACK */
spin_unlock(&mm->page_table_lock);
return 0;
}