lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

powerpc/mm: Unify PTE_RPN_SHIFT and _PAGE_CHG_MASK definitions

Browse Source 
This updates the 32-bit headers to use the same definitions for the RPN
shift inside the PTE as 64-bit, and thus updates _PAGE_CHG_MASK to
become identical.

This does introduce a runtime visible difference, which is that now,
_PAGE_HASHPTE will be part of _PAGE_CHG_MASK and thus preserved. However
this should have no practical effect as it should have been preserved in
the first place and we got away with not having it there due to our
PTE access functions preserving it anyway.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt
2009-03-10 17:53:30 +00:00
parent c605782b1c
commit a7d2dac802
2 changed files with 26 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
arch/powerpc/include/asm/pte-fsl-booke.h
View File

@ -36,6 +36,8 @@
#ifdef CONFIG_PTE_64BIT
/* ERPN in a PTE never gets cleared, ignore it */
#define _PTE_NONE_MASK 0xffffffffffff0000ULL
/* We extend the size of the PTE flags area when using 64-bit PTEs */
#define PTE_RPN_SHIFT (PAGE_SHIFT + 8)
#endif
#define _PMD_PRESENT 0