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| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2012-09-10 02:52:56 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-09-17 16:31:53 +1000 |
| commit | f033d659c3b931d8b2a16625155e20304e173c9f (patch) | |
| tree | 1e7cdacc0a981a77209ea04e4449b9beb52f097d /arch/powerpc/mm | |
| parent | 048ee0993ec8360abb0b51bdf8f8721e9ed62ec4 (diff) | |
| download | linux-3.10-f033d659c3b931d8b2a16625155e20304e173c9f.tar.gz linux-3.10-f033d659c3b931d8b2a16625155e20304e173c9f.tar.bz2 linux-3.10-f033d659c3b931d8b2a16625155e20304e173c9f.zip | |
powerpc/mm: Update VSID allocation documentation
This update the proto-VSID and VSID scramble related information
to be more generic by using names instead of current values.
Reviewed-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/mm')
| -rw-r--r-- | arch/powerpc/mm/mmu_context_hash64.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/arch/powerpc/mm/mmu_context_hash64.c b/arch/powerpc/mm/mmu_context_hash64.c index daa076c9025..40bc5b0ace5 100644 --- a/arch/powerpc/mm/mmu_context_hash64.c +++ b/arch/powerpc/mm/mmu_context_hash64.c @@ -30,9 +30,11 @@ static DEFINE_SPINLOCK(mmu_context_lock); static DEFINE_IDA(mmu_context_ida); /* - * The proto-VSID space has 2^35 - 1 segments available for user mappings. - * Each segment contains 2^28 bytes. Each context maps 2^44 bytes, - * so we can support 2^19-1 contexts (19 == 35 + 28 - 44). + * 256MB segment + * The proto-VSID space has 2^(CONTEX_BITS + USER_ESID_BITS) - 1 segments + * available for user mappings. Each segment contains 2^28 bytes. Each + * context maps 2^46 bytes (64TB) so we can support 2^19-1 contexts + * (19 == 37 + 28 - 46). */ #define MAX_CONTEXT ((1UL << CONTEXT_BITS) - 1) |