Baoquan He wrote:
On 05/18/22 at 12:26pm, Michael Ellerman wrote:
It seems that recordmcount is not really maintained anymore now that x86
uses objtool?
There've been several threads about fixing recordmcount, but none of
them seem to have lead to a solution.
These weak symbol vs recordmcount problems have been worked around going
back as far as 2020:
It gives me feeling that llvm or recordmcount should make adjustment,
but not innocent kernel code, if there are a lot of places reported.
I am curious how llvm or recordmcount dev respond to this.
As Michael stated, this is not just llvm - binutils has also adopted the
same and "unused" section symbols are being dropped.
For recordmcount, there were a few threads and approaches that have been
tried:
- https://patchwork.ozlabs.org/project/linuxppc-dev/patch/cd0f6bdfdf1ee096fb2c07e7b38940921b8e9118.1637764848.git.christophe.leroy@xxxxxxxxxx/
- https://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=297434&state=*
Objtool has picked up a more appropriate fix for this recently, and
long-term, we would like to move to using objtool for ftrace purposes:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/tools/objtool/elf.c?id=4abff6d48dbcea8200c7ea35ba70c242d128ebf3
While that is being pursued, we want to unbreak some of the CI and users
who are hitting this.
- Naveen
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