linux-kernel - Re: [PATCH 03/17] bit_spinlock: Prepare for split

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Message-ID: <20210409143555.GV2531743@casper.infradead.org>
Date:   Fri, 9 Apr 2021 15:35:55 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Theodore Ts'o <tytso@....edu>
Cc:     neilb@...e.de, peterz@...radead.org, mingo@...hat.com,
        will@...nel.org, longman@...hat.com, boqun.feng@...il.com,
        tglx@...utronix.de, bigeasy@...utronix.de,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/17] bit_spinlock: Prepare for split_locks

On Fri, Apr 09, 2021 at 10:32:47AM -0400, Theodore Ts'o wrote:
> On Fri, Apr 09, 2021 at 03:51:17AM +0100, Matthew Wilcox (Oracle) wrote:
> > Make bit_spin_lock() and variants variadic to help with the transition.
> > The split_lock parameter will become mandatory at the end of the series.
> > Also add bit_spin_lock_nested() and bit_spin_unlock_assign() which will
> > both be used by the rhashtable code later.
> > 
> > Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> 
> This changes the function signature for bit_spin_lock(), if I'm
> reading this correctly.  Hence, this is going to break git
> bisectability; was this patch series separated out for easy of review,
> and you were planning on collapsing things into a single patch to
> preserve bisectability?

It's perfectly bisectable.

Before: bit_spin_lock takes two arguments
During: bit_spin_lock takes at least two arguments, ignores all but the first two
After: bit_spin_lock takes three arguments