diff options
| author | Mike Rapoport <rppt@linux.ibm.com> | 2019-12-04 16:54:28 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-12-04 19:44:15 -0800 |
| commit | e19f97ed67d8f9b60e4ce14a7551d3dd45825570 (patch) | |
| tree | 1ac258f20a8d74c44a31b6d6b522ead81bf4251b /arch/um/kernel/mem.c | |
| parent | 4e65e76f1e588e6f5d263652179d51b31a2be855 (diff) | |
um: add support for folded p4d page tables
The UML port uses 4 and 5 level fixups to support higher level page
table directories in the generic VM code.
Implement primitives necessary for the 4th level folding, add walks of
p4d level where appropriate and drop usage of __ARCH_USE_5LEVEL_HACK.
Link: http://lkml.kernel.org/r/1572938135-31886-13-git-send-email-rppt@kernel.org
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Cc: Anatoly Pugachev <matorola@gmail.com>
Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Greentime Hu <green.hu@gmail.com>
Cc: Greg Ungerer <gerg@linux-m68k.org>
Cc: Helge Deller <deller@gmx.de>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Mark Salter <msalter@redhat.com>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Peter Rosin <peda@axentia.se>
Cc: Richard Weinberger <richard@nod.at>
Cc: Rolf Eike Beer <eike-kernel@sf-tec.de>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Russell King <rmk+kernel@armlinux.org.uk>
Cc: Sam Creasey <sammy@sammy.net>
Cc: Vincent Chen <deanbo422@gmail.com>
Cc: Vineet Gupta <Vineet.Gupta1@synopsys.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/um/kernel/mem.c')
| -rw-r--r-- | arch/um/kernel/mem.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c index 417ff647fb37..30885d0b94ac 100644 --- a/arch/um/kernel/mem.c +++ b/arch/um/kernel/mem.c @@ -96,6 +96,7 @@ static void __init fixrange_init(unsigned long start, unsigned long end, pgd_t *pgd_base) { pgd_t *pgd; + p4d_t *p4d; pud_t *pud; pmd_t *pmd; int i, j; @@ -107,7 +108,8 @@ static void __init fixrange_init(unsigned long start, unsigned long end, pgd = pgd_base + i; for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) { - pud = pud_offset(pgd, vaddr); + p4d = p4d_offset(pgd, vaddr); + pud = pud_offset(p4d, vaddr); if (pud_none(*pud)) one_md_table_init(pud); pmd = pmd_offset(pud, vaddr); @@ -124,6 +126,7 @@ static void __init fixaddr_user_init( void) #ifdef CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA long size = FIXADDR_USER_END - FIXADDR_USER_START; pgd_t *pgd; + p4d_t *p4d; pud_t *pud; pmd_t *pmd; pte_t *pte; @@ -144,7 +147,8 @@ static void __init fixaddr_user_init( void) for ( ; size > 0; size -= PAGE_SIZE, vaddr += PAGE_SIZE, p += PAGE_SIZE) { pgd = swapper_pg_dir + pgd_index(vaddr); - pud = pud_offset(pgd, vaddr); + p4d = p4d_offset(pgd, vaddr); + pud = pud_offset(p4d, vaddr); pmd = pmd_offset(pud, vaddr); pte = pte_offset_kernel(pmd, vaddr); pte_set_val(*pte, p, PAGE_READONLY); |