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libpmc: Use known pmc_cpuid buffer size

Authored by freqlabs on Jul 15 2020, 5:21 PM.



Use the existing PMC_CPUID_LEN to size pmc_cpuid in the kernel and various buffers for reading it in libpmc.
This avoids some extra syscalls and malloc/frees.

While in here, use strlcpy to copy a user-provided cpuid string instead of memcpy, to make sure we terminate the buffer.

Sorry for the extra review noise mav, this ended up changing a bit after taking a final look at the original patch :)

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Going to commit this tonight since there has been no objection

With kernel part I am definitely agree, while about first part of user space just won't object. While second part of user-space just had no sense before, the first one at least had some sense, even though not willing much.

This revision is now accepted and ready to land.Jul 28 2020, 1:21 AM
This revision was automatically updated to reflect the committed changes.