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SubjectRe: Getting weird TPM error after rebasing my tree to security/next-general
On Thu, Jan 31, 2019 at 09:43:42AM -0800, Linus Torvalds wrote:
> On Thu, Jan 31, 2019 at 9:06 AM Jarkko Sakkinen
> <> wrote:
> >
> > Found something that *does* fix the issue. If I replace memcpy_*io()
> > calls with regular memcpy(), the driver works and all my tests pass.
> That's not surprising, since that's what we used to do. And it's
> horribly wrong because "memcpy()" can do things that are horribly
> wrong on IO accesses. Like doing them twice, but alternatively also
> "copy one byte at a time" which generally works, but is horrendously
> slow for IO.

Yup, was just a sanity check.

> Can you check *which* memcpy_*io() triggers the issue? Maybe by
> "bisecting" them (first perhaps on a file-by-file basis, and then
> within a file).

Already did that. See my follow-up.


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