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  1. 24 Oct, 2006 2 commits
    • Eric W. Biederman's avatar
      [PATCH] x86-64: Only look at per_cpu data for online cpus. · 70a0a535
      Eric W. Biederman authored 
      When I generalized __assign_irq_vector I failed to pay attention
to what happens when you access a per cpu data structure for
a cpu that is not online.   It is an undefined case making any
code that does it have undefined behavior as well.

The code still needs to be able to allocate a vector across cpus
that are not online to properly handle combinations like lowest
priority interrupt delivery and cpu_hotplug.  Not that we can do
that today but the infrastructure shouldn't prevent it.

So this patch updates the places where we touch per cpu data
to only touch online cpus, it makes cpu vector allocation
an atomic operation with respect to cpu hotplug, and it updates
the cpu start code to properly initialize vector_irq so we
don't have inconsistencies.
Signed-off-by: default avatarEric W. Biederman <ebiederm@xmission.com>
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
      70a0a535
    • Eric W. Biederman's avatar
      [PATCH] x86-64: Simplify the vector allocator. · d1752aa8
      Eric W. Biederman authored 
      There is no reason to remember a per cpu position of which vector
to try.  Keeping a global position is simpler and more likely to
result in a global vector allocation even if I don't need or require
it.  For level triggered interrupts this means we are less likely to
acknowledge another cpus irq, and cause the level triggered irq to
harmlessly refire.

This simplification makes it easier to only access data structures
of  online cpus, by having fewer special cases to deal with.
Signed-off-by: default avatarEric W. Biederman <ebiederm@xmission.com>
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
      d1752aa8
  3. 23 Oct, 2006 13 commits
  5. 22 Oct, 2006 21 commits
  7. 21 Oct, 2006 4 commits