Re: [v5 3/6] powerpc/memcpy: Add memcpy_mcsafe for pmem

Santosh Sivaraj's on July 9, 2019 10:15 pm:

From: Balbir Singh <bsingharora@gmail.com>

The pmem infrastructure uses memcpy_mcsafe in the pmem layer so as to
convert machine check exceptions into a return value on failure in case
a machine check exception is encountered during the memcpy. The return
value is the number of bytes remaining to be copied.

This patch largely borrows from the copyuser_power7 logic and does not add
the VMX optimizations, largely to keep the patch simple. If needed those
optimizations can be folded in.

Shouldn't this patch go after the exception table stuff now if you
squashed them together?

Thanks,
Nick