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From: David Sterba <>
To: Anders Roxell <>
Subject: Re: [PATCH] btrfs: relocation: fix unused variable
Date: Tue, 29 Jan 2019 16:21:27 +0100
Message-ID: <> (raw)
In-Reply-To: <>

On Tue, Jan 29, 2019 at 02:01:46PM +0100, Anders Roxell wrote:
> When CONFIG_BRTFS_ASSERT isn't enabled, variable root_objectid isn't used.
> fs/btrfs/relocation.c: In function ‘insert_dirty_subv’:
> fs/btrfs/relocation.c:2138:6: warning: unused variable ‘root_objectid’ [-Wunused-variable]
>   u64 root_objectid = root->root_key.objectid;
>       ^~~~~~~~~~~~~
> Reworked by adding a runtime check in the assfail function instead of
> the '#ifdef CONFIG_BTRFS_ASSERT #else ...", so the compiler sees the
> condition being passed into an inline function after preprocessing.

I've fixed the warning by avoiding the local variable but I like your
fix in general, thanks.

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Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-29 13:01 Anders Roxell
2019-01-29 15:21 ` David Sterba [this message]
2019-01-29 15:42   ` David Sterba

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