From: Christoph Hellwig <hch@infradead.org>
To: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>,
linux-doc@vger.kernel.org, Hugh Dickins <hughd@google.com>,
kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
Ingo Molnar <mingo@kernel.org>,
linux-mm@kvack.org, Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Andrew Morton <akpm@linux-foundation.org>,
Vlastimil Babka <vbabka@suse.cz>
Subject: Re: [PATCH] Revert "mm: rename _count, field of the struct page, to _refcount"
Date: Thu, 16 Jun 2016 02:32:35 -0700 [thread overview]
Message-ID: <20160616093235.GA14640@infradead.org> (raw)
In-Reply-To: <1466068966-24620-1-git-send-email-vkuznets@redhat.com>
On Thu, Jun 16, 2016 at 11:22:46AM +0200, Vitaly Kuznetsov wrote:
> _count -> _refcount rename in commit 0139aa7b7fa12 ("mm: rename _count,
> field of the struct page, to _refcount") broke kdump. makedumpfile(8) does
> stuff like READ_MEMBER_OFFSET("page._count", page._count) and fails. While
> it is definitely possible to fix this particular tool I'm not sure about
> other tools which might be doing the same.
>
> I suggest we remember the "we don't break userspace" rule and revert for
> 4.7 while it's not too late.
Err, sorry - this is not "userspace". It's crazy crap digging into
kernel internal structure.
The rename was absolutely useful, so fix up your stinking pike in kdump.
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kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@infradead.org>
To: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: linux-mm@kvack.org, kexec@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Andrew Morton <akpm@linux-foundation.org>,
Stephen Rothwell <sfr@canb.auug.org.au>,
Vlastimil Babka <vbabka@suse.cz>, Hugh Dickins <hughd@google.com>,
Ingo Molnar <mingo@kernel.org>
Subject: Re: [PATCH] Revert "mm: rename _count, field of the struct page, to _refcount"
Date: Thu, 16 Jun 2016 02:32:35 -0700 [thread overview]
Message-ID: <20160616093235.GA14640@infradead.org> (raw)
In-Reply-To: <1466068966-24620-1-git-send-email-vkuznets@redhat.com>
On Thu, Jun 16, 2016 at 11:22:46AM +0200, Vitaly Kuznetsov wrote:
> _count -> _refcount rename in commit 0139aa7b7fa12 ("mm: rename _count,
> field of the struct page, to _refcount") broke kdump. makedumpfile(8) does
> stuff like READ_MEMBER_OFFSET("page._count", page._count) and fails. While
> it is definitely possible to fix this particular tool I'm not sure about
> other tools which might be doing the same.
>
> I suggest we remember the "we don't break userspace" rule and revert for
> 4.7 while it's not too late.
Err, sorry - this is not "userspace". It's crazy crap digging into
kernel internal structure.
The rename was absolutely useful, so fix up your stinking pike in kdump.
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WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@infradead.org>
To: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: linux-mm@kvack.org, kexec@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Andrew Morton <akpm@linux-foundation.org>,
Stephen Rothwell <sfr@canb.auug.org.au>,
Vlastimil Babka <vbabka@suse.cz>, Hugh Dickins <hughd@google.com>,
Ingo Molnar <mingo@kernel.org>
Subject: Re: [PATCH] Revert "mm: rename _count, field of the struct page, to _refcount"
Date: Thu, 16 Jun 2016 02:32:35 -0700 [thread overview]
Message-ID: <20160616093235.GA14640@infradead.org> (raw)
In-Reply-To: <1466068966-24620-1-git-send-email-vkuznets@redhat.com>
On Thu, Jun 16, 2016 at 11:22:46AM +0200, Vitaly Kuznetsov wrote:
> _count -> _refcount rename in commit 0139aa7b7fa12 ("mm: rename _count,
> field of the struct page, to _refcount") broke kdump. makedumpfile(8) does
> stuff like READ_MEMBER_OFFSET("page._count", page._count) and fails. While
> it is definitely possible to fix this particular tool I'm not sure about
> other tools which might be doing the same.
>
> I suggest we remember the "we don't break userspace" rule and revert for
> 4.7 while it's not too late.
Err, sorry - this is not "userspace". It's crazy crap digging into
kernel internal structure.
The rename was absolutely useful, so fix up your stinking pike in kdump.
next prev parent reply other threads:[~2016-06-16 9:32 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-16 9:22 [PATCH] Revert "mm: rename _count, field of the struct page, to _refcount" Vitaly Kuznetsov
2016-06-16 9:22 ` Vitaly Kuznetsov
2016-06-16 9:22 ` Vitaly Kuznetsov
2016-06-16 9:32 ` Christoph Hellwig [this message]
2016-06-16 9:32 ` Christoph Hellwig
2016-06-16 9:32 ` Christoph Hellwig
2016-06-16 10:30 ` Vitaly Kuznetsov
2016-06-16 10:30 ` Vitaly Kuznetsov
2016-06-16 10:30 ` Vitaly Kuznetsov
2016-06-16 10:59 ` Michal Hocko
2016-06-16 10:59 ` Michal Hocko
2016-06-16 10:59 ` Michal Hocko
2016-06-16 11:22 ` Vitaly Kuznetsov
2016-06-16 11:22 ` Vitaly Kuznetsov
2016-06-16 11:22 ` Vitaly Kuznetsov
2016-06-16 11:28 ` Michal Hocko
2016-06-16 11:28 ` Michal Hocko
2016-06-16 11:28 ` Michal Hocko
2016-06-16 9:36 ` Vlastimil Babka
2016-06-16 9:36 ` Vlastimil Babka
2016-06-16 9:36 ` Vlastimil Babka
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