linux-kernel - Re: [PATCH -rcu] kcsan: Make KCSAN compatible with lockdep

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Date:   Tue, 14 Jan 2020 18:24:17 +0100
From:   Alexander Potapenko <glider@...gle.com>
To:     Marco Elver <elver@...gle.com>
Cc:     paulmck@...nel.org, Andrey Konovalov <andreyknvl@...gle.com>,
        Dmitriy Vyukov <dvyukov@...gle.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, will@...nel.org,
        Qian Cai <cai@....pw>
Subject: Re: [PATCH -rcu] kcsan: Make KCSAN compatible with lockdep

> --- a/kernel/kcsan/core.c
> +++ b/kernel/kcsan/core.c
> @@ -337,7 +337,7 @@ kcsan_setup_watchpoint(const volatile void *ptr, size_t size, int type)
>          *      detection point of view) to simply disable preemptions to ensure
>          *      as many tasks as possible run on other CPUs.
>          */
> -       local_irq_save(irq_flags);
> +       raw_local_irq_save(irq_flags);

Please reflect the need to use raw_local_irq_save() in the comment.

>
>         watchpoint = insert_watchpoint((unsigned long)ptr, size, is_write);
>         if (watchpoint == NULL) {
> @@ -429,7 +429,7 @@ kcsan_setup_watchpoint(const volatile void *ptr, size_t size, int type)
>
>         kcsan_counter_dec(KCSAN_COUNTER_USED_WATCHPOINTS);
>  out_unlock:
> -       local_irq_restore(irq_flags);
> +       raw_local_irq_restore(irq_flags);

Ditto