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| author |   Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> | 2018-09-20 23:39:42 +0530 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2018-10-03 15:39:58 +1000 |
| commit | da7ad366b497f5fc1d4a416f168057ba40bddb98 (patch) | |
| tree | 2d8a123162eb61a0adbac9a0b16c6664c429611e /arch/powerpc/include/asm/book3s/64/hash.h | |
| parent | powerpc/powernv: Make possible for user to force a full ipl cec reboot (diff) | |
| download | linux-dev-da7ad366b497f5fc1d4a416f168057ba40bddb98.tar.xz linux-dev-da7ad366b497f5fc1d4a416f168057ba40bddb98.zip | |
powerpc/mm/book3s: Update pmd_present to look at _PAGE_PRESENT bit
With this patch we use 0x8000000000000000UL (_PAGE_PRESENT) to indicate a valid
pgd/pud/pmd entry. We also switch the p**_present() to look at this bit.
With pmd_present, we have a special case. We need to make sure we consider a
pmd marked invalid during THP split as present. Right now we clear the
_PAGE_PRESENT bit during a pmdp_invalidate. Inorder to consider this special
case we add a new pte bit _PAGE_INVALID (mapped to _RPAGE_SW0). This bit is
only used with _PAGE_PRESENT cleared. Hence we are not really losing a pte bit
for this special case. pmd_present is also updated to look at _PAGE_INVALID.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/book3s/64/hash.h')
| -rw-r--r-- | arch/powerpc/include/asm/book3s/64/hash.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/book3s/64/hash.h b/arch/powerpc/include/asm/book3s/64/hash.h index d52a51b2ce7b..fcf8b10a209f 100644 --- a/arch/powerpc/include/asm/book3s/64/hash.h +++ b/arch/powerpc/include/asm/book3s/64/hash.h @@ -18,6 +18,11 @@ #include <asm/book3s/64/hash-4k.h> #endif +/* Bits to set in a PMD/PUD/PGD entry valid bit*/ +#define HASH_PMD_VAL_BITS (0x8000000000000000UL) +#define HASH_PUD_VAL_BITS (0x8000000000000000UL) +#define HASH_PGD_VAL_BITS (0x8000000000000000UL) + /* * Size of EA range mapped by our pagetables. */ |