From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Matthew Wilcox <willy@infradead.org>
Cc: Gao Xiang <gaoxiang25@huawei.com>,
stable@vger.kernel.org, Chao Yu <yuchao0@huawei.com>,
linux-erofs@lists.ozlabs.org, miaoxie@huawei.com
Subject: Re: [PATCH for-4.19 06/12] staging: erofs: fix race when the managed cache is enabled
Date: Mon, 25 Feb 2019 16:52:43 +0100 [thread overview]
Message-ID: <20190225155243.GB12525@kroah.com> (raw)
In-Reply-To: <20190225152548.GA2496@bombadil.infradead.org>
On Mon, Feb 25, 2019 at 07:25:48AM -0800, Matthew Wilcox wrote:
> On Mon, Feb 25, 2019 at 04:04:49PM +0100, Greg Kroah-Hartman wrote:
> > On Wed, Feb 20, 2019 at 05:18:48PM +0800, Gao Xiang wrote:
> > > commit 51232df5e4b268936beccde5248f312a316800be upstream.
> > > Updates:
> > > include/linux/xarray.h:
> > > add xa_untag_pointer,xa_tag_pointer,xa_pointer_tag
> > > from upstream 3159f943aafd in order to reduce
> > > conflicts.
> >
> > No, sorry, I don't want to add xarray.h to 4.19.y, that's crazy.
>
> I gave this a quick look when it came past, and I don't particularly
> object to this piece going into 4.19.y. A full-on backport of XArray
> to 4.19 will be ... interesting, but essentially this is just some
> boilerplate.
>
> > And even if we did, you do not slip it in as part of a different patch,
> > it should come in as its own patch, with the same git commit id that it
> > landed in 4.20 with.
>
> Putting in all of 3159f943aafdbacb2f94c38fdaadabf2bbde2a14 would be a
> bad idea; it actually ended up breaking m68k in a rather unexpected way
> which required 66ee620f06f99d72475db6eb638559ba608c7dee, which in turn
> caused a memory consumption regression ...
Where did the chain of regressions stop? that would be good to know as
we will have to deal with this over time :)
thanks,
greg k-h
next prev parent reply other threads:[~2019-02-25 15:52 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-20 9:18 [PATCH for-4.19 00/12] erofs fixes for linux-4.19.y Gao Xiang
2019-02-20 9:18 ` [PATCH for-4.19 01/12] staging: erofs: fix a bug when appling cache strategy Gao Xiang
2019-02-20 9:18 ` [PATCH for-4.19 02/12] staging: erofs: complete error handing of z_erofs_do_read_page Gao Xiang
2019-02-25 14:59 ` Greg Kroah-Hartman
2019-02-25 15:04 ` Gao Xiang
2019-02-20 9:18 ` [PATCH for-4.19 03/12] staging: erofs: replace BUG_ON with DBG_BUGON in data.c Gao Xiang
2019-02-20 9:18 ` [PATCH for-4.19 04/12] staging: erofs: drop multiref support temporarily Gao Xiang
2019-02-20 9:18 ` [PATCH for-4.19 05/12] staging: erofs: remove the redundant d_rehash() for the root dentry Gao Xiang
2019-02-20 9:18 ` [PATCH for-4.19 06/12] staging: erofs: fix race when the managed cache is enabled Gao Xiang
2019-02-25 15:04 ` Greg Kroah-Hartman
2019-02-25 15:07 ` Gao Xiang
2019-02-25 15:51 ` Greg Kroah-Hartman
2019-02-25 15:57 ` Gao Xiang
2019-02-25 17:58 ` [PATCH for-4.19 1/2] xarray: Replace exceptional entries Gao Xiang
2019-02-25 17:58 ` [PATCH for-4.19 2/2] staging: erofs: fix race when the managed cache is enabled Gao Xiang
2019-02-25 18:27 ` [PATCH for-4.19 1/2] xarray: Replace exceptional entries Matthew Wilcox
2019-02-26 1:21 ` Gao Xiang
2019-02-26 5:14 ` [PATCH v2 " Gao Xiang
2019-02-26 5:14 ` [PATCH v2 for-4.19 2/2] staging: erofs: fix race when the managed cache is enabled Gao Xiang
2019-02-26 12:43 ` [PATCH v2 for-4.19 1/2] xarray: Replace exceptional entries Gao Xiang
2019-03-04 5:13 ` Gao Xiang
2019-03-13 9:18 ` Gao Xiang
2019-02-25 15:25 ` [PATCH for-4.19 06/12] staging: erofs: fix race when the managed cache is enabled Matthew Wilcox
2019-02-25 15:52 ` Greg Kroah-Hartman [this message]
2019-02-25 16:04 ` Matthew Wilcox
2019-02-20 9:18 ` [PATCH for-4.19 07/12] staging: erofs: atomic_cond_read_relaxed on ref-locked workgroup Gao Xiang
2019-02-20 9:18 ` [PATCH for-4.19 08/12] staging: erofs: fix `erofs_workgroup_{try_to_freeze, unfreeze}' Gao Xiang
2019-02-20 9:18 ` [PATCH for-4.19 09/12] staging: erofs: add a full barrier in erofs_workgroup_unfreeze Gao Xiang
2019-02-20 9:18 ` [PATCH for-4.19 10/12] staging: erofs: {dir,inode,super}.c: rectify BUG_ONs Gao Xiang
2019-02-20 9:18 ` [PATCH for-4.19 11/12] staging: erofs: unzip_{pagevec.h,vle.c}: " Gao Xiang
2019-02-20 9:18 ` [PATCH for-4.19 12/12] staging: erofs: unzip_vle_lz4.c,utils.c: " Gao Xiang
2019-02-22 8:35 ` [PATCH for-4.19 00/12] erofs fixes for linux-4.19.y Greg Kroah-Hartman
2019-02-22 9:03 ` Gao Xiang
2019-02-25 15:28 ` Greg Kroah-Hartman
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