linux-ext4 - Re: [PATCHv2 1/1] ext4: mballoc: Use this_cpu_read instead of this_cpu

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Message-ID: <20200611150340.GP1347934@mit.edu>
Date:   Thu, 11 Jun 2020 11:03:40 -0400
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Ritesh Harjani <riteshh@...ux.ibm.com>, linux-ext4@...r.kernel.org,
        jack@...e.com, Hillf Danton <hdanton@...a.com>,
        linux-fsdevel@...r.kernel.org, Borislav Petkov <bp@...en8.de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        syzbot+82f324bb69744c5f6969@...kaller.appspotmail.com
Subject: Re: [PATCHv2 1/1] ext4: mballoc: Use this_cpu_read instead of
 this_cpu_ptr

On Tue, Jun 09, 2020 at 11:25:38PM -0700, Christoph Hellwig wrote:
> On Tue, Jun 09, 2020 at 04:23:10PM +0530, Ritesh Harjani wrote:
> > Simplify reading a seq variable by directly using this_cpu_read API
> > instead of doing this_cpu_ptr and then dereferencing it.
> > 
> > This also avoid the below kernel BUG: which happens when
> > CONFIG_DEBUG_PREEMPT is enabled
> 
> I see this warning all the time with ext4 using tests VMs, so lets get
> this fixed ASAP before -rc1:
> 
> Reviewed-by: Christoph Hellwig <hch@....de>

Thanks, applied.

						- Ted