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Date: Thu, 11 Nov 2021 10:56:06 +0000
From: Valentin Schneider <valentin.schneider@....com>
To: Marco Elver <elver@...gle.com>
Cc: linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com,
linuxppc-dev@...ts.ozlabs.org, linux-kbuild@...r.kernel.org,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...nel.org>,
Frederic Weisbecker <frederic@...nel.org>,
Mike Galbraith <efault@....de>,
Dmitry Vyukov <dvyukov@...gle.com>,
Michael Ellerman <mpe@...erman.id.au>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Steven Rostedt <rostedt@...dmis.org>,
Masahiro Yamada <masahiroy@...nel.org>,
Michal Marek <michal.lkml@...kovi.net>,
Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH v2 2/5] preempt/dynamic: Introduce preempt mode accessors
On 11/11/21 09:54, Marco Elver wrote:
> On Wed, Nov 10, 2021 at 08:24PM +0000, Valentin Schneider wrote:
> [...]
>> +#ifdef CONFIG_PREEMPT_DYNAMIC
>> +
>> +extern bool is_preempt_none(void);
>> +extern bool is_preempt_voluntary(void);
>> +extern bool is_preempt_full(void);
>> +
>> +#else
>> +
>> +#define is_preempt_none() IS_ENABLED(CONFIG_PREEMPT_NONE)
>> +#define is_preempt_voluntary() IS_ENABLED(CONFIG_PREEMPT_VOLUNTARY)
>> +#define is_preempt_full() IS_ENABLED(CONFIG_PREEMPT)
>> +
>> +#endif
>> +
>> +#define is_preempt_rt() IS_ENABLED(CONFIG_PREEMPT_RT)
>> +
>
> Can these callables be real functions in all configs, making the
> !DYNAMIC ones just static inline bool ones? That'd catch invalid use in
> #if etc. in all configs.
>
Ack
>> /*
>> * Does a critical section need to be broken due to another
>> * task waiting?: (technically does not depend on CONFIG_PREEMPTION,
>> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
>> index 97047aa7b6c2..9db7f77e53c3 100644
>> --- a/kernel/sched/core.c
>> +++ b/kernel/sched/core.c
>> @@ -6638,6 +6638,17 @@ static void __init preempt_dynamic_init(void)
>> }
>> }
>>
>> +#define PREEMPT_MODE_ACCESSOR(mode) \
>> + bool is_preempt_##mode(void) \
>> + { \
>> + WARN_ON_ONCE(preempt_dynamic_mode == preempt_dynamic_undefined); \
>> + return preempt_dynamic_mode == preempt_dynamic_##mode; \
>> + }
>
> This needs an EXPORT_SYMBOL, so it's usable from modules like the
> kcsan_test module.
Ah, wasn't sure about that one, thanks!
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