linux-kernel - Re: [PATCH 4.14 023/159] mm/sparsemem: Allocate mem_section at runtime for CONFIG_SPARSEMEM

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Date:   Mon, 8 Jan 2018 08:53:08 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Mike Galbraith <efault@....de>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...capital.net>,
        Borislav Petkov <bp@...e.de>,
        Cyrill Gorcunov <gorcunov@...nvz.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>, linux-mm@...ck.org,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH 4.14 023/159] mm/sparsemem: Allocate mem_section at
 runtime for CONFIG_SPARSEMEM_EXTREME=y

On Sun, Jan 07, 2018 at 02:23:09PM +0100, Michal Hocko wrote:
> On Sun 07-01-18 13:44:02, Mike Galbraith wrote:
> > On Sun, 2018-01-07 at 11:18 +0100, Michal Hocko wrote:
> > > On Sun 07-01-18 10:11:15, Greg KH wrote:
> > > > On Sun, Jan 07, 2018 at 06:14:22AM +0100, Mike Galbraith wrote:
> > > > > On Fri, 2017-12-22 at 09:45 +0100, Greg Kroah-Hartman wrote:
> > > > > > 4.14-stable review patch.  If anyone has any objections, please let me know.
> > > > > 
> > > > > FYI, this broke kdump, or rather the makedumpfile part thereof.
> > > > >  Forward looking wreckage is par for the kdump course, but...
> > > > 
> > > > Is it also broken in Linus's tree with this patch?  Or is there an
> > > > add-on patch that I should apply to 4.14 to resolve this issue there?
> > > 
> > > This one http://lkml.kernel.org/r/1513932498-20350-1-git-send-email-bhe@redhat.com
> > > I guess.
> > 
> > That won't unbreak kdump, else master wouldn't be broken.  I don't care
> > deeply, or know if anyone else does, I'm just reporting it because I
> > met it and chased it down.
> 
> OK, I didn't notice that d8cfbbfa0f7 ("mm/sparse.c: wrong allocation
> for mem_section") made it in after rc6. I am still wondering why
> 83e3c48729 ("mm/sparsemem: Allocate mem_section at runtime for
> CONFIG_SPARSEMEM_EXTREME=y") made it into the stable tree in the first
> place.

It was part of the prep for the KTPI code from what I can tell.  If you
think it should be reverted, just let me know and I'll be glad to do so.

thanks,

greg k-h