Re: [PATCH] selftests/x86: Disable ldt_gdt_64 for now
From: Ingo Molnar
Date: Mon Jan 11 2016 - 05:59:42 EST
* Shuah Khan <shuahkh@xxxxxxxxxxxxxxx> wrote:
> On 01/06/2016 12:51 PM, Andy Lutomirski wrote:
> > ldt_gdt.c relies on cross-cpu invalidation of SS to do one of its
> > tests. On 32-bit builds, this works fine, but on 64-bit builds, it
> > only works if the kernel has proper SS sigcontext handling for
> > 64-bit user programs.
> > Since the SS fixes are currently reverted, restrict the test case to
> > 32 bits for now.
> > In principle, I could change the test to use a different segment
> > register, but it would be messy: CS can't point to the LDT for
> > 64-bit code, and the other registers don't result in immediate
> > faults because they aren't reloaded on kernel -> user transitions.
> > When we fix sigcontext (in 4.6?), we can revert this.
> > Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxx>
> > --
> This patch didn't apply to linux-kselftest next.
> It probably has to go through x86.
It doesn't apply to -tip either. Andy, which tree is this against?