vfs tapset compilation error.

[Daniel Fishman]

Hello,

When trying to execute the following:

stap -v -e 'probe vfs.read {printf("read performed\n"); exit()}'

compilation fails:

Pass 1: parsed user script and 144 library script(s) using 91224virt/39148res/2120shr kb, in 290usr/20sys/316real ms.
WARNING: cross-file global variable reference to identifier '__devnames' at /usr/share//systemtap/tapset/vfs.stp:20:8 from: identifier '__devnames' at /usr/share/systemtap/tapset/vfs.stp:23:13
 source: 	if (dev in __devnames)
         	           ^
semantic error: unresolved type : identifier '__devnames' at /usr/share//systemtap/tapset/vfs.stp:20:8
        source: global __devnames
                       ^
Pass 2: analyzed script: 2 probe(s), 23 function(s), 3 embed(s), 1 global(s) using 323644virt/145452res/6872shr kb, in 1750usr/220sys/1971real ms.
Pass 2: analysis failed.  Try again with another '--vp 01' option.


Why __devnames's type cannot be resolved?

Thanks,
Daniel.