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  1. 19 4月, 2006 35 次提交
  3. 18 4月, 2006 5 次提交
    • P
      powerpc: Use correct sequence for putting CPU into nap mode · f39224a8
      由 Paul Mackerras 提交于 
      We weren't using the recommended sequence for putting the CPU into
nap mode.  When I changed the idle loop, for some reason 7447A cpus
started hanging when we put them into nap mode.  Changing to the
recommended sequence fixes that.

The complexity here is that the recommended sequence is a loop that
keeps putting the cpu back into nap mode.  Clearly we need some way
to break out of the loop when an interrupt (external interrupt,
decrementer, performance monitor) occurs.  Here we use a bit in
the thread_info struct to indicate that we need this, and the exception
entry code notices this and arranges for the exception to return
to the value in the link register, thus breaking out of the loop.
We use a new `local_flags' field in the thread_info which we can
alter without needing to use an atomic update sequence.

The PPC970 has the same recommended sequence, so we do the same thing
there too.

This also fixes a bug in the kernel stack overflow handling code on
32-bit, since it was causing a value that we needed in a register to
get trashed.
Signed-off-by: NPaul Mackerras <paulus@samba.org>
      f39224a8
    • J
      drm: Fix further issues in drivers/char/drm/via_irq.c · d253258c
      由 Jayachandran C 提交于 
      Fix de-reference of 'dev_priv' before NULL check.
Signed-off-by: NJayachandran C. <c.jayachandran@gmail.com>
Cc: Dave Airlie <airlied@linux.ie>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
      d253258c
    • A
      drivers/char/drm/drm_memory.c: possible cleanups · 031de96a
      由 Adrian Bunk 提交于 
      - #if 0 the following unused global function:
  - drm_ioremap_nocache()

- make the following needlessly global functions static:
  - agp_remap()
  - drm_lookup_map()
Signed-off-by: NAdrian Bunk <bunk@stusta.de>
Cc: Dave Airlie <airlied@linux.ie>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
      031de96a
    • O
      [PATCH 2/2] cfq: fix cic's rbtree traversal · dbecf3ab
      由 OGAWA Hirofumi 提交于 
      When queue dies, we set cic->key=NULL as dead mark. So, when we
traverse a rbtree, we must check whether it's still valid key. if it
was invalidated, drop it, then restart the traversal from top.
Signed-off-by: NOGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: NJens Axboe <axboe@suse.de>
      dbecf3ab
    • O
      [PATCH 1/2] iosched: fix typo and barrier() · fba82272
      由 OGAWA Hirofumi 提交于 
      On rmmod path, cfq/as waits to make sure all io-contexts was
freed. However, it's using complete(), not wait_for_completion().

I think barrier() is not enough in here. To avoid the following case,
this patch replaces barrier() with smb_wmb().

	cpu0			visibility			cpu1
	                [ioc_gnone=NULL,ioc_count=1]

ioc_gnone = &all_gone		NULL,ioc_count=1
atomic_read(&ioc_count)		NULL,ioc_count=1
wait_for_completion()		NULL,ioc_count=0	atomic_sub_and_test()
				NULL,ioc_count=0	if ( && ioc_gone)
						    [ioc_gone==NULL,
						    so doesn't call complete()]
			   &all_gone,ioc_count=0
Signed-off-by: NOGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: NJens Axboe <axboe@suse.de>
      fba82272