Can we please remove the CALLER_ADDR0 et al. evaluations at the top level in perf_fetch_caller_regs()? I take great pains to avoid having to flush the register windows on sparc64 even when fetching callchains et al and any __builtin_return_address() with an argument greater than zero is going to force a register window flush to get emitted by gcc undoing all of my hard work :-) You guys can put it into the x86 perf_fetch_caller_regs() or similar. If you need it to be evaluated at the call site, make the inline overridable by the platform headers. I noticed that the powerpc assembler Paul posted the past few days ignores this "ip" arg passed down and computes it by hand as it walks up the stack chain in assembler. PowerPC therefore might be getting similar inefficiences due to this CALLER_ADDR? stuff. Thanks. -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
