linux-kernel - Re: [PATCH] ext4: extents: Remove unnecessary ‘NULL’ values from ablocks

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Message-ID: <20240402035535.GD1189142@mit.edu>
Date: Mon, 1 Apr 2024 23:55:35 -0400
From: "Theodore Ts'o" <tytso@....edu>
To: Li zeming <zeming@...china.com>
Cc: adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ext4: extents: Remove unnecessary ‘NULL’ values from ablocks

On Tue, Apr 02, 2024 at 10:48:04AM +0800, Li zeming wrote:
> ablocks is assigned first, so it does not need to initialize the
> assignment.

That's technically true, but the compiler is perfectly capable of
optimizing it out.  So it's harmless, and removing it does make the
code a bit more fragile, since it needs to be set so that the cleanup
code doesn't accidentally dereference an uninitialized pointer.

Cheers,

					- Ted