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SubjectRe: [PATCH v14] x86, mce: Add memcpy_mcsafe()
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On Fri, Mar 11, 2016 at 2:10 PM, Tony Luck <tony.luck@gmail.com> wrote:
> On Thu, Mar 10, 2016 at 11:37 AM, Luck, Tony <tony.luck@intel.com> wrote:
>>> But you return 0 == false for success and 1 == true for failure.
>>
>> Aaargh! -ETOOMUCHSHELLSCRIPTPROGRAMMING
>>
>> -Tony
>
> Options to fix this:
> 1) Just change the comments in the code.
> This seems like it would confuse people as I thing most people
> would expect the "true" return to mean the copy succeeded.
> 2) Reverse the return values.
> Better that option 1 - but doesn't leave scope to return a count
> if some future user does want to know where the copy failed.
> 3) Change the return type back from "bool" to "int"
> 0 == success, non-zero == fail (with option to put the non-copied
> byte count in later).
> 4) Something else
>

You could return 0 for success and -EIO for failure (positive value
for 'location' if that support ever resurfaces).

That would at least let me drop the ternary conversion I have in
memcpy_from_pmem() [1] to convert bool to an error code.

[1]: https://patchwork.kernel.org/patch/8559521/

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