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Commit d1b4bfbf authored by Toshi Kani's avatar Toshi Kani Committed by Ingo Molnar
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x86/mm/pat: Add pgprot_writethrough() 



Add pgprot_writethrough() for setting page protection flags to
Write-Through mode.

Signed-off-by: default avatarToshi Kani <toshi.kani@hp.com>
Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Elliott@hp.com
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Luis R. Rodriguez <mcgrof@suse.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: arnd@arndb.de
Cc: hch@lst.de
Cc: hmh@hmh.eng.br
Cc: jgross@suse.com
Cc: konrad.wilk@oracle.com
Cc: linux-mm <linux-mm@kvack.org>
Cc: linux-nvdimm@lists.01.org
Cc: stefan.bader@canonical.com
Cc: yigal@plexistor.com
Link: http://lkml.kernel.org/r/1433436928-31903-11-git-send-email-bp@alien8.de


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent c7c95f19

arch/x86/include/asm/pgtable_types.h

+3 −0
Original line number Diff line number Diff line
@@ -367,6 +367,9 @@ extern int nx_enabled; 
#define pgprot_writecombine	pgprot_writecombine

extern pgprot_t pgprot_writecombine(pgprot_t prot);



#define pgprot_writethrough	pgprot_writethrough

extern pgprot_t pgprot_writethrough(pgprot_t prot);



/* Indicate that x86 has its own track and untrack pfn vma functions */

#define __HAVE_PFNMAP_TRACKING

arch/x86/mm/pat.c

+7 −0
Original line number Diff line number Diff line
@@ -1000,6 +1000,13 @@ pgprot_t pgprot_writecombine(pgprot_t prot) 
}

EXPORT_SYMBOL_GPL(pgprot_writecombine);



pgprot_t pgprot_writethrough(pgprot_t prot)

{

	return __pgprot(pgprot_val(prot) |

				cachemode2protval(_PAGE_CACHE_MODE_WT));

}

EXPORT_SYMBOL_GPL(pgprot_writethrough);



#if defined(CONFIG_DEBUG_FS) && defined(CONFIG_X86_PAT)



static struct memtype *memtype_get_idx(loff_t pos)

include/asm-generic/pgtable.h

+4 −0
Original line number Diff line number Diff line
@@ -262,6 +262,10 @@ static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b) 
#define pgprot_writecombine pgprot_noncached

#endif



#ifndef pgprot_writethrough

#define pgprot_writethrough pgprot_noncached

#endif



#ifndef pgprot_device

#define pgprot_device pgprot_noncached

#endif