• Steven Rostedt's avatar
    ftrace: type cast filter+verifier · 7104f300
    Steven Rostedt authored
    The mmiotrace map had a bug that would typecast the entry from
    the trace to the wrong type. That is a known danger of C typecasts,
    there's absolutely zero checking done on them.
    
    Help that problem a bit by using a GCC extension to implement a
    type filter that restricts the types that a trace record can be
    cast into, and by adding a dynamic check (in debug mode) to verify
    the type of the entry.
    
    This patch adds a macro to assign all entries of ftrace using the type
    of the variable and checking the entry id. The typecasts are now done
    in the macro for only those types that it knows about, which should
    be all the types that are allowed to be read from the tracer.
    Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    7104f300
trace_mmiotrace.c 8.83 KB