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alpha/mm: enable ARCH_HAS_VM_GET_PAGE_PROT 

This enables ARCH_HAS_VM_GET_PAGE_PROT on the platform and exports
standard vm_get_page_prot() implementation via DECLARE_VM_GET_PAGE_PROT,
which looks up a private and static protection_map[] array.  Subsequently
all __SXXX and __PXXX macros can be dropped which are no longer needed.

Link: https://lkml.kernel.org/r/20220711070600.2378316-15-anshuman.khandual@arm.com
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Brian Cain <bcain@quicinc.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Chris Zankel <chris@zankel.net>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Guo Ren <guoren@kernel.org>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Rich Felker <dalias@libc.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vineet Gupta <vgupta@kernel.org>
Cc: WANG Xuerui <kernel@xen0n.name>
Cc: Will Deacon <will@kernel.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Anshuman Khandual 2022-07-11 12:35:48 +05:30 committed by akpm
parent 252358f1a1
commit 4975f604fe
3 changed files with 23 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/alpha/Kconfig
View File

@ -2,6 +2,7 @@
config ALPHA
bool
default y
select ARCH_HAS_VM_GET_PAGE_PROT
select ARCH_32BIT_USTAT_F_TINODE
select ARCH_MIGHT_HAVE_PC_PARPORT
select ARCH_MIGHT_HAVE_PC_SERIO

17
arch/alpha/include/asm/pgtable.h
View File

@ -116,23 +116,6 @@ struct vm_area_struct;
* arch/alpha/mm/fault.c)
*/
/* xwr */
#define __P000 _PAGE_P(_PAGE_FOE | _PAGE_FOW | _PAGE_FOR)
#define __P001 _PAGE_P(_PAGE_FOE | _PAGE_FOW)
#define __P010 _PAGE_P(_PAGE_FOE)
#define __P011 _PAGE_P(_PAGE_FOE)
#define __P100 _PAGE_P(_PAGE_FOW | _PAGE_FOR)
#define __P101 _PAGE_P(_PAGE_FOW)
#define __P110 _PAGE_P(0)
#define __P111 _PAGE_P(0)
#define __S000 _PAGE_S(_PAGE_FOE | _PAGE_FOW | _PAGE_FOR)
#define __S001 _PAGE_S(_PAGE_FOE | _PAGE_FOW)
#define __S010 _PAGE_S(_PAGE_FOE)
#define __S011 _PAGE_S(_PAGE_FOE)
#define __S100 _PAGE_S(_PAGE_FOW | _PAGE_FOR)
#define __S101 _PAGE_S(_PAGE_FOW)
#define __S110 _PAGE_S(0)
#define __S111 _PAGE_S(0)
/*
* pgprot_noncached() is only for infiniband pci support, and a real

22
arch/alpha/mm/init.c
View File

@ -280,3 +280,25 @@ mem_init(void)
high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
memblock_free_all();
}
static const pgprot_t protection_map[16] = {
[VM_NONE] = _PAGE_P(_PAGE_FOE | _PAGE_FOW |
_PAGE_FOR),
[VM_READ] = _PAGE_P(_PAGE_FOE | _PAGE_FOW),
[VM_WRITE] = _PAGE_P(_PAGE_FOE),
[VM_WRITE | VM_READ] = _PAGE_P(_PAGE_FOE),
[VM_EXEC] = _PAGE_P(_PAGE_FOW | _PAGE_FOR),
[VM_EXEC | VM_READ] = _PAGE_P(_PAGE_FOW),
[VM_EXEC | VM_WRITE] = _PAGE_P(0),
[VM_EXEC | VM_WRITE | VM_READ] = _PAGE_P(0),
[VM_SHARED] = _PAGE_S(_PAGE_FOE | _PAGE_FOW |
_PAGE_FOR),
[VM_SHARED | VM_READ] = _PAGE_S(_PAGE_FOE | _PAGE_FOW),
[VM_SHARED | VM_WRITE] = _PAGE_S(_PAGE_FOE),
[VM_SHARED | VM_WRITE | VM_READ] = _PAGE_S(_PAGE_FOE),
[VM_SHARED | VM_EXEC] = _PAGE_S(_PAGE_FOW | _PAGE_FOR),
[VM_SHARED | VM_EXEC | VM_READ] = _PAGE_S(_PAGE_FOW),
[VM_SHARED | VM_EXEC | VM_WRITE] = _PAGE_S(0),
[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = _PAGE_S(0)
};
DECLARE_VM_GET_PAGE_PROT