LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Andi Kleen <ak@suse.de>
To: Ingo Molnar <mingo@elte.hu>
Cc: tglx@linutronix.de, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] [5/8] Fix logic error in 64bit memory hotadd
Date: Mon, 11 Feb 2008 14:44:24 +0100	[thread overview]
Message-ID: <200802111444.24496.ak@suse.de> (raw)
In-Reply-To: <20080211133333.GA5842@elte.hu>

On Monday 11 February 2008 14:33:33 Ingo Molnar wrote:
> 
> * Andi Kleen <ak@suse.de> wrote:
> 
> > > Also, your fix, while it solves a real bug we want to fix, is not quite 
> > > right for upstream integration yet. I can see 3 immediate problems with 
> > > it:
> > > 
> > > > +			if (!pud_present(*pud)) {
> > > > +				pud = (pud_t *)get_zeroed_page(GFP_ATOMIC);
> > > 
> > > the GFP_ATOMIC here can fail.
> > 
> > The memory hotplug code already uses GFP_ATOMIC elsewhere 
> > (spp_getpage)
> 
> wrong. The _x86_ memory hotplug code uses GFP_ATOMIC elsewhere.
> The generic memory hotplug code does not.

To be honest I'm a little tired now how you attempt to misinterpret every
word I write. Was it not clear from the context which code
was meant?

> 
> and the x86 memory hotplug code uses GFP_ATOMIC and panic() elsewhere 
> because:

I see it's all my fault. 

> 
> > The existing code already panics elsewhere (spp_getpage); i just 
> > copied that.
> 
> and you had nothing to do with that "existing code"? git-log reveals 
> that the GFP_ATOMIC and panic()-ing patch was added 2 years ago and was 
> signed off by you:

Should I point out all unclean and buggy code you ever signed
off?  @) Just alone in .25-rc1 there is enough of that.

> 
>   commit 44df75e629106efcada087cead6c3f33ed6bcc60
>   Author: Matt Tolentino <metolent@cs.vt.edu>
>   Date:   Tue Jan 17 07:03:41 2006 +0100
> 
>     [PATCH] x86_64: add x86-64 support for memory hot-add
> 
>   [...]
>   Signed-off-by: Andi Kleen <ak@suse.de>
> 
> We (like most upstream kernel subsystems) generally do not accept 
> patches into arch/x86 that spreads a buggy implementation detail 
> further. Please submit a patch that cleans up the mess. Thanks,

Ok I withdraw the patch under these circumstances. I'm not your coding
slave and I don't feel strongly enough about the hotplug case to 
put much more work into this.

-Andi

  reply	other threads:[~2008-02-11 13:44 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-11  9:34 [PATCH] [0/8] Various kernel mapping bug fixes Andi Kleen
2008-02-11  9:34 ` [PATCH] [1/8] CPA: Fix gbpages support in try_preserve_lage_page Andi Kleen
2008-02-11  9:45   ` Thomas Gleixner
2008-02-11 10:12     ` Ingo Molnar
2008-02-11 11:01       ` Andi Kleen
2008-02-11  9:34 ` [PATCH] [2/8] CPA: Flush the caches when setting pages not present Andi Kleen
2008-02-11 11:00   ` Ingo Molnar
2008-02-11 12:26     ` Andi Kleen
2008-02-11  9:34 ` [PATCH] [3/8] CPA: Test the correct mapping alias on x86-64 Andi Kleen
2008-02-11 11:49   ` Ingo Molnar
2008-02-11  9:34 ` [PATCH] [4/8] CPA: Fix set_memory_x for ioremap Andi Kleen
2008-02-11 12:27   ` Ingo Molnar
2008-02-11 12:45     ` Andi Kleen
2008-02-11  9:34 ` [PATCH] [5/8] Fix logic error in 64bit memory hotadd Andi Kleen
2008-02-11 12:46   ` Ingo Molnar
2008-02-11 13:05     ` Andi Kleen
2008-02-11 13:33       ` Ingo Molnar
2008-02-11 13:44         ` Andi Kleen [this message]
2008-02-12 10:35       ` Yasunori Goto
2008-02-12 11:20         ` Andi Kleen
2008-02-11  9:34 ` [PATCH] [6/8] Account overlapped mappings in end_pfn_map Andi Kleen
2008-02-11 13:08   ` Ingo Molnar
2008-02-11 13:27     ` Andi Kleen
2008-02-11 13:55       ` Ingo Molnar
2008-02-11 14:16       ` Peter Zijlstra
2008-02-11 14:24         ` Andi Kleen
2008-02-11 14:41           ` Sam Ravnborg
2008-02-11 15:12   ` Arjan van de Ven
2008-02-11  9:34 ` [PATCH] [7/8] Implement true end_pfn_mapped for 32bit Andi Kleen
2008-02-12 19:39   ` Thomas Gleixner
2008-02-12 19:49     ` Andi Kleen
2008-02-12 20:25       ` Thomas Gleixner
2008-02-11  9:34 ` [PATCH] [8/8] RFC: Fix some EFI problems Andi Kleen
2008-02-12 20:04   ` Thomas Gleixner
2008-02-12 20:23     ` Andi Kleen
2008-02-12 20:48       ` Thomas Gleixner
2008-02-13 11:05         ` Andi Kleen

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=200802111444.24496.ak@suse.de \
    --to=ak@suse.de \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mingo@elte.hu \
    --cc=tglx@linutronix.de \
    --subject='Re: [PATCH] [5/8] Fix logic error in 64bit memory hotadd' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).