Michael Ellerman <m...@ellerman.id.au> a écrit :
LEROY Christophe <christophe.le...@c-s.fr> writes:
Benjamin Herrenschmidt <b...@kernel.crashing.org> a écrit :
When hitting below a VM_GROWSDOWN vma (typically growing the stack),
we check whether it's a valid stack-growing instruction and we
check the distance to GPR1. This is largely open coded with lots
of comments, so move it out to a helper.
Did you have a look at the following patch ? It's been waiting for
application for some weeks now.
https://patchwork.ozlabs.org/patch/771869
I actually merged it last merge window, but found I had no good way to
test it, so I took it out again until I can write a test case for it.
The way I realised it wasn't being tested was by removing all the
store_updates_sp logic entirely and having my system run happily for
several days :}
Which demonstrates how unlikely this is, hence doing that get_user()
at every fault is waste of time.
How do you plan to handle that in parralele to ben's serie ?
I'll be back from vacation next week and may help finding a way to
test that. (A test program using alloca() ?)
Christophe
cheers
