tracing: protect reader of cmdline output

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Impact: fix to one cause of incorrect comm outputs in trace

The spinlock only protected the creation of a comm <=> pid pair.
But it was possible that a reader could look up a pid, and get the
wrong comm because it had no locking.

This also required changing trace_find_cmdline to copy the comm cache
and not just send back a pointer to it.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>

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This commit is contained in:

Steven Rostedt 2009-03-16 19:20:15 -04:00

parent 03303549b1

commit 4ca5308523

5 changed files with 49 additions and 26 deletions

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23

kernel/trace/blktrace.c

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20

kernel/trace/trace.c

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2

kernel/trace/trace.h

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12

kernel/trace/trace_functions_graph.c

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18

kernel/trace/trace_output.c

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