1. 04 Feb, 2008 1 commit
    • Richard Purdie's avatar
      [ARM] 4736/1: Export atags to userspace and allow kexec to use customised atags · 4cd9d6f7
      Richard Purdie authored
      
      
      Currently, the atags used by kexec are fixed to the ones originally used
      to boot the kernel. This is less than ideal as changing the commandline,
      initrd and other options would be a useful feature.
      
      This patch exports the atags used for the current kernel to userspace
      through an "atags" file in procfs. The presence of the file is
      controlled by its own Kconfig option and cleans up several ifdef blocks
      into a separate file. The tags for the new kernel are assumed to be at
      a fixed location before the kernel image itself. The location of the
      tags used to boot the original kernel is unimportant and no longer
      saved.
      
      Based on a patch from Uli Luckas <u.luckas@road.de>
      Signed-off-by: default avatarRichard Purdie <rpurdie@rpsys.net>
      Acked-by: default avatarUli Luckas <u.luckas@road.de>
      Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
      4cd9d6f7
  2. 01 Feb, 2008 2 commits
  3. 30 Jan, 2008 1 commit
    • Nick Piggin's avatar
      spinlock: lockbreak cleanup · 95c354fe
      Nick Piggin authored
      
      
      The break_lock data structure and code for spinlocks is quite nasty.
      Not only does it double the size of a spinlock but it changes locking to
      a potentially less optimal trylock.
      
      Put all of that under CONFIG_GENERIC_LOCKBREAK, and introduce a
      __raw_spin_is_contended that uses the lock data itself to determine whether
      there are waiters on the lock, to be used if CONFIG_GENERIC_LOCKBREAK is
      not set.
      
      Rename need_lockbreak to spin_needbreak, make it use spin_is_contended to
      decouple it from the spinlock implementation, and make it typesafe (rwlocks
      do not have any need_lockbreak sites -- why do they even get bloated up
      with that break_lock then?).
      Signed-off-by: default avatarNick Piggin <npiggin@suse.de>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      95c354fe
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