On Thu, Jul 16, 2020 at 12:50 PM Thomas Gleixner wrote:
>
> From: Thomas Gleixner
>
> On syscall entry certain work needs to be done:
>
>- Establish state (lockdep, context tracking, tracing)
>- Conditional work (ptrace, seccomp, audit...)
>
> This code is needlessly duplicated and diffe
Andy Lutomirski writes:
>> On Jul 19, 2020, at 3:17 AM, Thomas Gleixner wrote:
>>
>> Andy Lutomirski writes:
On Sat, Jul 18, 2020 at 7:16 AM Thomas Gleixner wrote:
Andy Lutomirski writes:
> FWIW, TIF_USER_RETURN_NOTIFY is a bit of an odd duck: it's an
> entry/exit word *and
> On Jul 19, 2020, at 3:17 AM, Thomas Gleixner wrote:
>
> Andy Lutomirski writes:
>>> On Sat, Jul 18, 2020 at 7:16 AM Thomas Gleixner wrote:
>>> Andy Lutomirski writes:
FWIW, TIF_USER_RETURN_NOTIFY is a bit of an odd duck: it's an
entry/exit word *and* a context switch word. The
Andy Lutomirski writes:
> On Sat, Jul 18, 2020 at 7:16 AM Thomas Gleixner wrote:
>> Andy Lutomirski writes:
>> > FWIW, TIF_USER_RETURN_NOTIFY is a bit of an odd duck: it's an
>> > entry/exit word *and* a context switch word. The latter is because
>> > it's logically a per-cpu flag, not a per-ta
On Sat, Jul 18, 2020 at 7:16 AM Thomas Gleixner wrote:
>
> Andy Lutomirski writes:
> > On Fri, Jul 17, 2020 at 12:29 PM Thomas Gleixner wrote:
> >> The alternative is to play nasty games with TIF_IA32, TIF_ADDR32 and
> >> TIF_X32 to free up bits for 32bit and make the flags field 64 bit on 64
>
Andy Lutomirski writes:
> On Fri, Jul 17, 2020 at 12:29 PM Thomas Gleixner wrote:
>> The alternative is to play nasty games with TIF_IA32, TIF_ADDR32 and
>> TIF_X32 to free up bits for 32bit and make the flags field 64 bit on 64
>> bit kernels, but I prefer to do the above seperation.
>
> I'm all
On Fri, Jul 17, 2020 at 12:29 PM Thomas Gleixner wrote:
>
> Kees Cook writes:
> > On Thu, Jul 16, 2020 at 11:55:59PM +0200, Thomas Gleixner wrote:
> >> Kees Cook writes:
> >> >> +/*
> >> >> + * Define dummy _TIF work flags if not defined by the architecture or
> >> >> for
> >> >> + * disabled f
Kees Cook writes:
> On Thu, Jul 16, 2020 at 11:55:59PM +0200, Thomas Gleixner wrote:
>> Kees Cook writes:
>> >> +/*
>> >> + * Define dummy _TIF work flags if not defined by the architecture or for
>> >> + * disabled functionality.
>> >> + */
>> >
>> > When I was thinking about this last week I wa
On Thu, Jul 16, 2020 at 11:55:59PM +0200, Thomas Gleixner wrote:
> Kees Cook writes:
> > On Thu, Jul 16, 2020 at 08:22:09PM +0200, Thomas Gleixner wrote:
> >> This code is needlessly duplicated and different in all
> >> architectures.
> >>
> >> Provide a generic version based on the x86 implemen
Kees Cook writes:
> On Thu, Jul 16, 2020 at 08:22:09PM +0200, Thomas Gleixner wrote:
>> This code is needlessly duplicated and different in all
>> architectures.
>>
>> Provide a generic version based on the x86 implementation which has all the
>> RCU and instrumentation bits right.
>
> Ahh! You'
On Thu, Jul 16, 2020 at 08:22:09PM +0200, Thomas Gleixner wrote:
> From: Thomas Gleixner
>
> On syscall entry certain work needs to be done:
>
>- Establish state (lockdep, context tracking, tracing)
>- Conditional work (ptrace, seccomp, audit...)
>
> This code is needlessly duplicated a
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