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author | Paul Burton <paulburton@kernel.org> | 2019-11-01 14:35:49 -0700 |
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committer | Paul Burton <paulburton@kernel.org> | 2019-11-01 14:36:44 -0700 |
commit | 02fce139fd14d3b0126f0a72e8c0a83b5b01f9f5 (patch) | |
tree | 20e69aae8d0acfcd7edc954e70a9d751e0b54a7e /Documentation/arm64/memory.rst | |
parent | 8a5a499871308c093ced3c5a383b72502b96e0d2 (diff) | |
parent | b42aa3fd5957e4daf4b69129e5ce752a2a53e7d6 (diff) |
Merge tag 'mips_fixes_5.4_3' into mips-next
Pull in mips-fixes primarily to gain build fixes in order to allow
better testing of mips-next.
A few MIPS fixes:
- Fix VDSO time-related function behavior for systems where we need to
fall back to syscalls, but were instead returning bogus results.
- A fix to TLB exception handlers for Cavium Octeon systems where they
would inadvertently clobber the $1/$at register.
- A build fix for bcm63xx configurations.
- Switch to using my @kernel.org email address.
Signed-off-by: Paul Burton <paulburton@kernel.org>
Diffstat (limited to 'Documentation/arm64/memory.rst')
-rw-r--r-- | Documentation/arm64/memory.rst | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/Documentation/arm64/memory.rst b/Documentation/arm64/memory.rst index b040909e45f8..02e02175e6f5 100644 --- a/Documentation/arm64/memory.rst +++ b/Documentation/arm64/memory.rst @@ -154,11 +154,18 @@ return virtual addresses to userspace from a 48-bit range. Software can "opt-in" to receiving VAs from a 52-bit space by specifying an mmap hint parameter that is larger than 48-bit. + For example: - maybe_high_address = mmap(~0UL, size, prot, flags,...); + +.. code-block:: c + + maybe_high_address = mmap(~0UL, size, prot, flags,...); It is also possible to build a debug kernel that returns addresses from a 52-bit space by enabling the following kernel config options: + +.. code-block:: sh + CONFIG_EXPERT=y && CONFIG_ARM64_FORCE_52BIT=y Note that this option is only intended for debugging applications |