linux-kernel - Re: [PATCH v2] binder: use bitmap for faster descriptor lookup

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Message-ID: <CAH5fLgjzVHSAQBF5-C1BthK1jspAGRr1z4SQXdQepkeVL9Eq2A@mail.gmail.com>
Date: Wed, 15 May 2024 17:29:29 +0200
From: Alice Ryhl <aliceryhl@...gle.com>
To: Carlos Llamas <cmllamas@...gle.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Arve Hjønnevåg <arve@...roid.com>, 
	Todd Kjos <tkjos@...roid.com>, Martijn Coenen <maco@...roid.com>, 
	Joel Fernandes <joel@...lfernandes.org>, Christian Brauner <brauner@...nel.org>, 
	Suren Baghdasaryan <surenb@...gle.com>, linux-kernel@...r.kernel.org, kernel-team@...roid.com, 
	Tim Murray <timmurray@...gle.com>, John Stultz <jstultz@...gle.com>, 
	Steven Moreland <smoreland@...gle.com>, Nick Chen <chenjia3@...o.com>
Subject: Re: [PATCH v2] binder: use bitmap for faster descriptor lookup

On Tue, May 14, 2024 at 6:09 PM Carlos Llamas <cmllamas@...gle.com> wrote:
> +static inline int
> +dbitmap_get_first_zero_bit(struct dbitmap *dmap, unsigned long *bit)
> +{
> +       unsigned long n;
> +
> +       n = find_first_zero_bit(dmap->map, dmap->nbits);
> +       if (unlikely(n == dmap->nbits))
> +               return -ENOSPC;
> +
> +       *bit = n;
> +       set_bit(n, dmap->map);
> +
> +       return 0;
> +}

Could we rename this method to something that makes it more clear that
it's not just a getter, but that it actually also sets the bit?

Alice