Messages in this thread | ![/](/images/icornerl.gif) | | From | Arnd Bergmann <> | Date | Wed, 15 Jan 2020 15:21:52 +0100 | Subject | Re: [RFC 1/4] asm-generic/uaccess: don't define inline functions if noinline lib/* in use |
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On Wed, Jan 15, 2020 at 3:12 PM Al Viro <viro@zeniv.linux.org.uk> wrote: > > On Wed, Jan 15, 2020 at 10:08:31AM +0100, Arnd Bergmann wrote: > > > > I would suggest that anybody who uses asm-generic/uaccess.h needs to > > > simply use the generic library version. > > > > Or possibly just everybody altogether: the remaining architectures that > > have a custom implementation don't seem to be doing any better either. > > No go for s390. There you really want to access userland memory in > larger chunks - it's oriented for block transfers. IIRC, the insn > they are using has a costly setup phase, independent of the amount > to copy, followed by reasonably fast transfer more or less linear > by the size.
Right, I missed that one while looking through the remaining implementations.
Arnd
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