29 Apr, 2008

1 commit

• 4488c59c9   fs/ramfs/ extern cleanup ... Browse Code »

  - internal.h shouldn't duplicate the extern declaration for
  ramfs_file_operations already in include/linux/ramfs.h
  - file-mmu.c needs two #include's for seeing the extern declarations
  of it's global struct's

  Signed-off-by: Adrian Bunk
  Signed-off-by: Andrew Morton
  Signed-off-by: Linus Torvalds

  Adrian Bunk

  2008-04-29 23:06:00 +0800  

13 Feb, 2007

1 commit

• c5ef1c42c   [PATCH] mark struct inode_operations const 3 ... Browse Code »

  Many struct inode_operations in the kernel can be "const". Marking them const
  moves these to the .rodata section, which avoids false sharing with potential
  dirty data. In addition it'll catch accidental writes at compile time to
  these shared resources.

  Signed-off-by: Arjan van de Ven
  Signed-off-by: Andrew Morton
  Signed-off-by: Linus Torvalds

  Arjan van de Ven

  2007-02-13 01:48:46 +0800  

29 Jun, 2006

1 commit

• f5e54d6e5   [PATCH] mark address_space_operations const ... Browse Code »

  Same as with already do with the file operations: keep them in .rodata and
  prevents people from doing runtime patching.

  Signed-off-by: Christoph Hellwig
  Cc: Steven French
  Signed-off-by: Andrew Morton
  Signed-off-by: Linus Torvalds

  Christoph Hellwig

  2006-06-29 05:59:04 +0800  

29 Mar, 2006

1 commit

• 4b6f5d20b   [PATCH] Make most file operations structs in fs/ const ... Browse Code »

  This is a conversion to make the various file_operations structs in fs/
  const. Basically a regexp job, with a few manual fixups

  The goal is both to increase correctness (harder to accidentally write to
  shared datastructures) and reducing the false sharing of cachelines with
  things that get dirty in .data (while .rodata is nicely read only and thus
  cache clean)

  Signed-off-by: Arjan van de Ven
  Signed-off-by: Andrew Morton
  Signed-off-by: Linus Torvalds

  Arjan van de Ven

  2006-03-29 01:16:06 +0800  

07 Jan, 2006

1 commit

• 642fb4d1f   [PATCH] NOMMU: Provide shared-writable mmap support on ramfs ... Browse Code »

  The attached patch makes ramfs support shared-writable mmaps by:

  (1) Attempting to perform a contiguous block allocation to the requested size
  when truncate attempts to increase the file from zero size, such as
  happens when:

  fd = shm_open("/file/on/ramfs", ...):
  ftruncate(fd, size_requested);
  addr = mmap(NULL, subsize, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_SHARED,
  fd, offset);

  (2) Permitting any shared-writable mapping over any contiguous set of extant
  pages. get_unmapped_area() will return the address into the actual ramfs
  pages. The mapping may start anywhere and be of any size, but may not go
  over the end of file. Multiple mappings may overlap in any way.

  (3) Not permitting a file to be shrunk if it would truncate any shared
  mappings (private mappings are copied).

  Thus this patch provides support for POSIX shared memory on NOMMU kernels,
  with certain limitations such as there being a large enough block of pages
  available to support the allocation and it only working on directly mappable
  filesystems.

  Signed-off-by: David Howells
  Signed-off-by: Andrew Morton
  Signed-off-by: Linus Torvalds

  David Howells

  2006-01-07 00:33:32 +0800