Re: [PATCH] arm64: increase stack size for KASAN_EXTRA

Qian Cai
2018-12-11T22:22:21Z

On Tue, 2018-12-11 at 23:12 +0100, Arnd Bergmann wrote:
> On Tue, Dec 11, 2018 at 10:59 PM Qian Cai <cai@lca.pw> wrote:
> >
> > On Tue, 2018-12-11 at 22:56 +0100, Arnd Bergmann wrote:
> > > On Tue, Dec 11, 2018 at 10:52 PM Qian Cai <cai@lca.pw> wrote:
> > > > On Tue, 2018-12-11 at 22:43 +0100, Arnd Bergmann wrote:
> > > > > On Tue, Dec 11, 2018 at 6:18 PM Qian Cai <cai@lca.pw> wrote:
> > > >
> > > > I am not too keen to do the version-check considering some LTS versions
> > > > could
> > > > just back-port those patches and the render the version-check
> > > > incorrectly.
> > >
> > > I'm not following what the problem is. Do you mean distro versions gcc
> > > with the compiler bugfix, or LTS kernel versions?
> > >
> >
> > I mean distro versions of GCC where the version is still 8 but keep back-
> > porting
> > tons of patches.
>
> Ok, but in that case, checking the version would still be no worse
> than your current patch, the only difference is that for users of a
> fixed older gcc, the kernel would use more stack than it needs.
>

I am thinking about something it is probably best just waiting for those major
distors to complete upgrading to GCC9 or back-porting those stack reduction
patches first. Then, it is good time to tie up loose ends for those default
stack sizes in all combinations.