1. 27 May, 2010 38 commits
  2. 26 May, 2010 1 commit
    • Linus Torvalds's avatar
      Revert "endian: #define __BYTE_ORDER" · 13da9e20
      Linus Torvalds authored
      This reverts commit b3b77c8c, which was
      also totally broken (see commit 0d2daf5c that reverted the crc32
      version of it).  As reported by Stephen Rothwell, it causes problems on
      big-endian machines:
      
      > In file included from fs/jfs/jfs_types.h:33,
      >                  from fs/jfs/jfs_incore.h:26,
      >                  from fs/jfs/file.c:22:
      > fs/jfs/endian24.h:36:101: warning: "__LITTLE_ENDIAN" is not defined
      
      The kernel has never had that crazy "__BYTE_ORDER == __LITTLE_ENDIAN"
      model.  It's not how we do things, and it isn't how we _should_ do
      things.  So don't go there.
      Requested-by: default avatarStephen Rothwell <sfr@canb.auug.org.au>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      13da9e20
  3. 25 May, 2010 1 commit
    • Kay Sievers's avatar
      driver core: add devname module aliases to allow module on-demand auto-loading · 578454ff
      Kay Sievers authored
      This adds:
        alias: devname:<name>
      to some common kernel modules, which will allow the on-demand loading
      of the kernel module when the device node is accessed.
      
      Ideally all these modules would be compiled-in, but distros seems too
      much in love with their modularization that we need to cover the common
      cases with this new facility. It will allow us to remove a bunch of pretty
      useless init scripts and modprobes from init scripts.
      
      The static device node aliases will be carried in the module itself. The
      program depmod will extract this information to a file in the module directory:
        $ cat /lib/modules/2.6.34-00650-g537b60d1-dirty/modules.devname
        # Device nodes to trigger on-demand module loading.
        microcode cpu/microcode c10:184
        fuse fuse c10:229
        ppp_generic ppp c108:0
        tun net/tun c10:200
        dm_mod mapper/control c10:235
      
      Udev will pick up the depmod created file on startup and create all the
      static device nodes which the kernel modules specify, so that these modules
      get automatically loaded when the device node is accessed:
        $ /sbin/udevd --debug
        ...
        static_dev_create_from_modules: mknod '/dev/cpu/microcode' c10:184
        static_dev_create_from_modules: mknod '/dev/fuse' c10:229
        static_dev_create_from_modules: mknod '/dev/ppp' c108:0
        static_dev_create_from_modules: mknod '/dev/net/tun' c10:200
        static_dev_create_from_modules: mknod '/dev/mapper/control' c10:235
        udev_rules_apply_static_dev_perms: chmod '/dev/net/tun' 0666
        udev_rules_apply_static_dev_perms: chmod '/dev/fuse' 0666
      
      A few device nodes are switched to statically allocated numbers, to allow
      the static nodes to work. This might also useful for systems which still run
      a plain static /dev, which is completely unsafe to use with any dynamic minor
      numbers.
      
      Note:
      The devname aliases must be limited to the *common* and *single*instance*
      device nodes, like the misc devices, and never be used for conceptually limited
      systems like the loop devices, which should rather get fixed properly and get a
      control node for losetup to talk to, instead of creating a random number of
      device nodes in advance, regardless if they are ever used.
      
      This facility is to hide the mess distros are creating with too modualized
      kernels, and just to hide that these modules are not compiled-in, and not to
      paper-over broken concepts. Thanks! :)
      
      Cc: Greg Kroah-Hartman <gregkh@suse.de>
      Cc: David S. Miller <davem@davemloft.net>
      Cc: Miklos Szeredi <miklos@szeredi.hu>
      Cc: Chris Mason <chris.mason@oracle.com>
      Cc: Alasdair G Kergon <agk@redhat.com>
      Cc: Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
      Cc: Ian Kent <raven@themaw.net>
      Signed-Off-By: default avatarKay Sievers <kay.sievers@vrfy.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      578454ff