linux-kernel - Re: [PATCH v2 2/4] eventfd: simplify eventfd

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Date:   Wed, 22 Nov 2023 17:19:06 +0200
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Christian Brauner <brauner@...nel.org>,
        linux-fsdevel@...r.kernel.org
Cc:     Christoph Hellwig <hch@....de>, Jan Kara <jack@...e.cz>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
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        Thomas Gleixner <tglx@...utronix.de>,
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Subject: Re: [PATCH v2 2/4] eventfd: simplify eventfd_signal()

On Wed, 22 Nov 2023, Christian Brauner <brauner@...nel.org> wrote:
> diff --git a/fs/eventfd.c b/fs/eventfd.c
> index 33a918f9566c..dc9e01053235 100644
> --- a/fs/eventfd.c
> +++ b/fs/eventfd.c
> @@ -74,20 +74,17 @@ __u64 eventfd_signal_mask(struct eventfd_ctx *ctx, __u64 n, __poll_t mask)
>  /**
>   * eventfd_signal - Adds @n to the eventfd counter.

This still refers to @n here, and in patch 4.

BR,
Jani.

>   * @ctx: [in] Pointer to the eventfd context.
> - * @n: [in] Value of the counter to be added to the eventfd internal counter.
> - *          The value cannot be negative.
>   *
>   * This function is supposed to be called by the kernel in paths that do not
>   * allow sleeping. In this function we allow the counter to reach the ULLONG_MAX
>   * value, and we signal this as overflow condition by returning a EPOLLERR
>   * to poll(2).
>   *
> - * Returns the amount by which the counter was incremented.  This will be less
> - * than @n if the counter has overflowed.
> + * Returns the amount by which the counter was incremented.
>   */
> -__u64 eventfd_signal(struct eventfd_ctx *ctx, __u64 n)
> +__u64 eventfd_signal(struct eventfd_ctx *ctx)
>  {
> -	return eventfd_signal_mask(ctx, n, 0);
> +	return eventfd_signal_mask(ctx, 1, 0);
>  }
>  EXPORT_SYMBOL_GPL(eventfd_signal);
>  

-- 
Jani Nikula, Intel