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authorPaul Burton <paulburton@kernel.org>2019-11-01 14:35:49 -0700
committerPaul Burton <paulburton@kernel.org>2019-11-01 14:36:44 -0700
commit02fce139fd14d3b0126f0a72e8c0a83b5b01f9f5 (patch)
tree20e69aae8d0acfcd7edc954e70a9d751e0b54a7e /Documentation/arm64/memory.rst
parent8a5a499871308c093ced3c5a383b72502b96e0d2 (diff)
parentb42aa3fd5957e4daf4b69129e5ce752a2a53e7d6 (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.rst9
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