Messages in this thread | | | Date | Tue, 24 May 2022 15:45:20 +0530 | From | "Naveen N. Rao" <> | Subject | Re: [RFC PATCH 1/4] objtool: Add --mnop as an option to --mcount |
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Christophe Leroy wrote: > > > Le 23/05/2022 à 19:55, Sathvika Vasireddy a écrit : >> Architectures can select HAVE_NOP_MCOUNT if they choose >> to nop out mcount call sites. If that config option is >> selected, then --mnop is passed as an option to objtool, >> along with --mcount. >> > > Is there a reason not to nop out mcount call sites on powerpc as well ?
Yes, if there are functions that are out of range of _mcount(), then the linker would have inserted long branch trampolines. We detect such cases during boot. But, if we nop out the _mcount call sites during build time, we will need some other way to identify these.
- Naveen
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