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authorMathieu Desnoyers <mathieu.desnoyers@polymtl.ca>2008-07-29 22:33:31 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-30 09:41:45 -0700
commit5def9a3a22e09c99717f41ab7f07ec9e1a1f3ec8 (patch)
treebff29b34c38efdb4da902e6c6a23be0df8e9b854 /drivers/serial
parentb68bb2632453a9ca7d10a00d79adf60968cb4c05 (diff)
markers: fix markers read barrier for multiple probes
Paul pointed out two incorrect read barriers in the marker handler code in the path where multiple probes are connected. Those are ordering reads of "ptype" (single or multi probe marker), "multi" array pointer, and "multi" array data access. It should be ordered like this : read ptype smp_rmb() read multi array pointer smp_read_barrier_depends() access data referenced by multi array pointer The code with a single probe connected (optimized case, does not have to allocate an array) has correct memory ordering. It applies to kernel 2.6.26.x, 2.6.25.x and linux-next. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Cc: <stable@kernel.org> [2.6.25.x, 2.6.26.x] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/serial')
0 files changed, 0 insertions, 0 deletions