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Diffstat (limited to 'Documentation/nommu-mmap.txt')
| -rw-r--r-- | Documentation/nommu-mmap.txt | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/Documentation/nommu-mmap.txt b/Documentation/nommu-mmap.txt index 39a62ab0f50a..69556f0d494b 100644 --- a/Documentation/nommu-mmap.txt +++ b/Documentation/nommu-mmap.txt @@ -1,5 +1,5 @@ ============================= -NO-MMU MEMORY MAPPING SUPPORT +No-MMU memory mapping support ============================= The kernel has limited support for memory mapping under no-MMU conditions, such @@ -105,7 +105,7 @@ and it's also much more restricted in the latter case: provide any such support, then the mapping request will be denied. -FURTHER NOTES ON NO-MMU MMAP +Further notes on no-MMU MMAP ============================ (#) A request for a private mapping of a file may return a buffer that is not @@ -160,7 +160,7 @@ FURTHER NOTES ON NO-MMU MMAP with character device files, pipes, fifos and sockets. -INTERPROCESS SHARED MEMORY +Interprocess shared memory ========================== Both SYSV IPC SHM shared memory and POSIX shared memory is supported in NOMMU @@ -168,7 +168,7 @@ mode. The former through the usual mechanism, the latter through files created on ramfs or tmpfs mounts. -FUTEXES +Futexes ======= Futexes are supported in NOMMU mode if the arch supports them. An error will @@ -177,7 +177,7 @@ mappings made by a process or if the mapping in which the address lies does not support futexes (such as an I/O chardev mapping). -NO-MMU MREMAP +No-MMU mremap ============= The mremap() function is partially supported. It may change the size of a @@ -199,7 +199,7 @@ act on a complete mapping. .. [#] Not currently supported. -PROVIDING SHAREABLE CHARACTER DEVICE SUPPORT +Providing shareable character device support ============================================ To provide shareable character device support, a driver must provide a @@ -244,7 +244,7 @@ copy mapped otherwise. circumstances! -PROVIDING SHAREABLE MEMORY-BACKED FILE SUPPORT +Providing shareable memory-backed file support ============================================== Provision of shared mappings on memory backed files is similar to the provision @@ -261,7 +261,7 @@ Memory backed devices are indicated by the mapping's backing device info having the memory_backed flag set. -PROVIDING SHAREABLE BLOCK DEVICE SUPPORT +Providing shareable block device support ======================================== Provision of shared mappings on block device files is exactly the same as for @@ -269,7 +269,7 @@ character devices. If there isn't a real device underneath, then the driver should allocate sufficient contiguous memory to honour any supported mapping. -ADJUSTING PAGE TRIMMING BEHAVIOUR +Adjusting page trimming behaviour ================================= NOMMU mmap automatically rounds up to the nearest power-of-2 number of pages |