linux-ext4 - Re: [PATCH v4] ext4: add test for all ext4/ext3/ext2 mount options

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Message-ID: <20211104084315.qvmuy5bf4tzd56op@work>
Date:   Thu, 4 Nov 2021 09:43:15 +0100
From:   Lukas Czerner <lczerner@...hat.com>
To:     Theodore Ts'o <tytso@....edu>
Cc:     fstests@...r.kernel.org, linux-ext4@...r.kernel.org, guan@...u.me
Subject: Re: [PATCH v4] ext4: add test for all ext4/ext3/ext2 mount options

On Wed, Nov 03, 2021 at 11:33:18PM -0400, Theodore Ts'o wrote:
> > +_has_kernel_config()
> > +{
> > +	option=$1
> > +	config="/lib/modules/$(uname -r)/build/.config"
> > +	grep -qE "^${option}=[my]" $config
> > +}
> 
> In my test infrastructure, /lib/modules/$Kver/build/.config doesn't
> exist.  That's because I build the kernel without any modules, and
> then launch kvm using its --kernel command-line option.  This really
> helps with development velocity, since the developer doesn't need to
> waste time installing the kernel, and/or building a kernel rpm or
> dpkg.  Instead, kvm can just launch the kernel directly out of the
> build tree:
> 
> /usr/bin/kvm ... --kernel /build/ext4/arch/x86/boot/bzImage ..
> 
> So it would be nice if _has_kernel_config also checks to see if
> /proc/config.gz exists, and if so, tries to use it.

Good point. Of course it would only work if kernel is configured to have
/proc/config.gz, but I don't know of any other reliable way to checking
the kernel config.

Thanks!
-Lukas

> 
> Thanks,
> 
> 			       	   	 - Ted
>