linux-kernel - Re: [PATCH 0/2] bitmap_parselist: support 'all' semantics

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Date:   Tue, 20 Apr 2021 13:19:11 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Yury Norov <yury.norov@...il.com>
Cc:     linux-kernel@...r.kernel.org, rcu@...r.kernel.org,
        linux-doc@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Jonathan Corbet <corbet@....net>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 0/2] bitmap_parselist: support 'all' semantics

On Mon, Apr 19, 2021 at 05:01:29PM -0700, Yury Norov wrote:
> RCU code supports a special group 'all' which selects all bits in a bitmap.
> We have recently added 'N' extension for bitmap parse, so that '0-N' would
> have exactly the same meaning as 'all'. But because the 'all' is already
> used by RCU, it would be reasonable to support it in core bitmap code as a
> common and easy-readable alias for '0-N'.
> 
> Moving the 'all' support to core bitmap code adds another level of
> flexibility for system configuration by supporting patterns. For example,
> every second bit in cpumask may be selected like this:
> 	isolcpus=all:1/2

After addressing a couple of nit-picks,
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

> Yury Norov (2):
>   bitmap_parse: support 'all' semantics
>   rcu/tree_plugin: don't handle the case of 'all' CPU range
> 
>  Documentation/admin-guide/kernel-parameters.rst | 5 +++++
>  kernel/rcu/tree_plugin.h                        | 9 +++------
>  lib/bitmap.c                                    | 9 +++++++++
>  lib/test_bitmap.c                               | 8 +++++++-
>  4 files changed, 24 insertions(+), 7 deletions(-)
> 
> -- 
> 2.25.1
> 

-- 
With Best Regards,
Andy Shevchenko