1. 05 Jun, 2010 6 commits
    • Linus Torvalds's avatar
      module: move find_module check to end · 3bafeb62
      Linus Torvalds authored
      I think Rusty may have made the lock a bit _too_ finegrained there, and
      didn't add it to some places that needed it. It looks, for example, like
      PATCH 1/2 actually drops the lock in places where it's needed
      ("find_module()" is documented to need it, but now load_module() didn't
      hold it at all when it did the find_module()).
      
      Rather than adding a new "module_loading" list, I think we should be able
      to just use the existing "modules" list, and just fix up the locking a
      bit.
      
      In fact, maybe we could just move the "look up existing module" a bit
      later - optimistically assuming that the module doesn't exist, and then
      just undoing the work if it turns out that we were wrong, just before
      adding ourselves to the list.
      Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
      3bafeb62
    • Rusty Russell's avatar
      module: make locking more fine-grained. · 75676500
      Rusty Russell authored
      Kay Sievers <kay.sievers@vrfy.org> reports that we still have some
      contention over module loading which is slowing boot.
      
      Linus also disliked a previous "drop lock and regrab" patch to fix the
      bne2 "gave up waiting for init of module libcrc32c" message.
      
      This is more ambitious: we only grab the lock where we need it.
      Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
      Cc: Brandon Philips <brandon@ifup.org>
      Cc: Kay Sievers <kay.sievers@vrfy.org>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      75676500
    • Rusty Russell's avatar
      module: Make module sysfs functions private. · 6407ebb2
      Rusty Russell authored
      These were placed in the header in ef665c1a to get the various
      SYSFS/MODULE config combintations to compile.
      
      That may have been necessary then, but it's not now.  These functions
      are all local to module.c.
      Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
      Cc: Randy Dunlap <randy.dunlap@oracle.com>
      6407ebb2
    • Rusty Russell's avatar
      module: move sysfs exposure to end of load_module · 80a3d1bb
      Rusty Russell authored
      This means a little extra work, but is more logical: we don't put
      anything in sysfs until we're about to put the module into the
      global list an parse its parameters.
      
      This also gives us a logical place to put duplicate module detection
      in the next patch.
      Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
      80a3d1bb
    • Rusty Russell's avatar
      module: fix kdb's illicit use of struct module_use. · c8e21ced
      Rusty Russell authored
      Linus changed the structure, and luckily this didn't compile any more.
      Reported-by: default avatarStephen Rothwell <sfr@canb.auug.org.au>
      Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
      Cc: Jason Wessel <jason.wessel@windriver.com>
      Cc: Martin Hicks <mort@sgi.com>
      c8e21ced
    • Linus Torvalds's avatar
      module: Make the 'usage' lists be two-way · 2c02dfe7
      Linus Torvalds authored
      When adding a module that depends on another one, we used to create a
      one-way list of "modules_which_use_me", so that module unloading could
      see who needs a module.
      
      It's actually quite simple to make that list go both ways: so that we
      not only can see "who uses me", but also see a list of modules that are
      "used by me".
      
      In fact, we always wanted that list in "module_unload_free()": when we
      unload a module, we want to also release all the other modules that are
      used by that module.  But because we didn't have that list, we used to
      first iterate over all modules, and then iterate over each "used by me"
      list of that module.
      
      By making the list two-way, we simplify module_unload_free(), and it
      allows for some trivial fixes later too.
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (cleaned & rebased)
      2c02dfe7
  2. 03 Jun, 2010 34 commits