From: Frederic Weisbecker <frederic@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: LKML <linux-kernel@vger.kernel.org>, Mel Gorman <mgorman@suse.de>,
Michal Hocko <mhocko@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
"Paul E . McKenney" <paulmck@kernel.org>,
Ingo Molnar <mingo@redhat.com>, Michal Hocko <mhocko@suse.com>
Subject: Re: [RFC PATCH 1/7] static_call/x86: Add __static_call_returnl0()
Date: Tue, 10 Nov 2020 14:42:23 +0100 [thread overview]
Message-ID: <20201110134223.GB48886@lothringen> (raw)
In-Reply-To: <20201110101307.GO2651@hirez.programming.kicks-ass.net>
On Tue, Nov 10, 2020 at 11:13:07AM +0100, Peter Zijlstra wrote:
> On Tue, Nov 10, 2020 at 10:55:15AM +0100, Peter Zijlstra wrote:
> > On Tue, Nov 10, 2020 at 01:56:03AM +0100, Frederic Weisbecker wrote:
> >
> > > [fweisbec: s/disp16/data16, integrate into text_get_insn(), elaborate
> > > comment on the resulting insn, emulate on int3 trap, provide validation,
> > > uninline __static_call_return0() for HAVE_STATIC_CALL]
>
> > Why did you add full emulation of this? The patch I send to you used the
> > text_poke_bp(.emulate) argument to have it emulate an actual call to the
> > out-of-line version of that function.
> >
> > That should work fine and is a lot less code.
>
> For reference; the below is what I send you. Actually doing the
> __static_call_return0() call while we poke the magic XOR instruction is
> much simpler.
Ok I'll get back to that. I'll just tweak a bit static_call_validate()
so that it is aware of that instruction.
Thanks.
next prev parent reply other threads:[~2020-11-10 13:42 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-10 0:56 [RFC PATCH 0/7] preempt: Tune preemption flavour on boot v3 Frederic Weisbecker
2020-11-10 0:56 ` [RFC PATCH 1/7] static_call/x86: Add __static_call_returnl0() Frederic Weisbecker
2020-11-10 9:55 ` Peter Zijlstra
2020-11-10 10:13 ` Peter Zijlstra
2020-11-10 13:42 ` Frederic Weisbecker [this message]
2020-11-10 13:53 ` Peter Zijlstra
2020-11-10 13:24 ` Frederic Weisbecker
2020-11-10 10:06 ` Peter Zijlstra
2020-11-10 0:56 ` [RFC PATCH 2/7] static_call: Pull some static_call declarations to the type headers Frederic Weisbecker
2020-11-10 0:56 ` [RFC PATCH 3/7] preempt: Introduce CONFIG_PREEMPT_DYNAMIC Frederic Weisbecker
2020-11-10 0:56 ` [RFC PATCH 4/7] preempt/dynamic: Provide cond_resched() and might_resched() static calls Frederic Weisbecker
2020-11-10 10:39 ` Peter Zijlstra
2020-11-10 10:48 ` Peter Zijlstra
2021-01-18 13:58 ` Frederic Weisbecker
2020-11-10 0:56 ` [RFC PATCH 5/7] preempt/dynamic: Provide preempt_schedule[_notrace]() " Frederic Weisbecker
2020-11-10 0:56 ` [RFC PATCH 6/7] preempt/dynamic: Provide irqentry_exit_cond_resched() static call Frederic Weisbecker
2020-11-10 10:32 ` Peter Zijlstra
2020-11-10 13:45 ` Frederic Weisbecker
2020-11-10 0:56 ` [RFC PATCH 7/7] preempt/dynamic: Support dynamic preempt with preempt= boot option Frederic Weisbecker
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