Messages in this thread | | | Date | Thu, 21 Sep 2006 22:38:28 -0400 | From | Mathieu Desnoyers <> | Subject | Re: [PATCH] Linux Kernel Markers 0.7 for 2.6.17 (with type checking!) |
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* Jeremy Fitzhardinge (jeremy@goop.org) wrote: > Mathieu Desnoyers wrote: > >#define MARK_SYM(name) \ > > do { \ > > __label__ here; \ > > volatile static void *__mark_kprobe_##name \ > > asm (MARK_CALL_PREFIX#name) \ > > __attribute__((unused)) = &&here; \ > >here: \ > > do { } while(0); \ > > } while(0) > > > >Which fixes the problem. Some tests showed me that the compiler does not > >unroll > >an otherwise unrolled loop when this specific macro is called. (test done > >with > >-funroll-all-loops). > > Eh? I thought you wanted to avoid changing the generated code? > Inhibiting loop unrolling could be a pretty large change... >
From what I see in 2.6.17/2.6.18 makefiles, only -OS and -O2 are generally used by the build system (no -O3) and there is not use of -funroll-loops. I guess it must not be so useful in this context.
Mathieu
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