linux-kernel - Re: Re: [PATCH -tip 3/3] x86: Remove unused text_poke_smp and text_poke_smp

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Date:	Mon, 22 Jul 2013 12:01:58 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Steven Rostedt <rostedt@...dmis.org>,
	Jason Baron <jbaron@...mai.com>, yrl.pp-manager.tt@...achi.com,
	Borislav Petkov <bpetkov@...e.de>
Subject: Re: Re: [PATCH -tip 3/3] x86: Remove unused text_poke_smp and
 text_poke_smp_batch


* Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> wrote:

> (2013/07/22 17:21), Ingo Molnar wrote:
> > 
> > * Ingo Molnar <mingo@...nel.org> wrote:
> > 
> >>
> >> * Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> wrote:
> >>
> >>> Since introducing the text_poke_bp for all text_poke_smp*
> >>> callers, text_poke_smp* are now unused. This basically
> >>> reverts 3d55cc8a, 7deb18dc and related commits.
> >>>
> >>> This also fixes a Kconfig dependency issue on STOP_MACHINE
> >>> in the case of CONFIG_SMP && !CONFIG_MODULE_UNLOAD.
> >>>
> >>> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> >>> ---
> >>>  arch/x86/Kconfig                   |    5 --
> >>>  arch/x86/include/asm/alternative.h |   11 ----
> >>>  arch/x86/kernel/alternative.c      |   98 +-----------------------------------
> >>>  3 files changed, 2 insertions(+), 112 deletions(-)
> >>
> >> Hm, it does not build with the attached config:
> >>
> >> arch/x86/kernel/kprobes/opt.c: In function 'setup_optimize_kprobe':
> >> arch/x86/kernel/kprobes/opt.c:394:6: error: dereferencing pointer to incomplete type
> >> arch/x86/kernel/kprobes/opt.c:395:6: error: dereferencing pointer to incomplete type
> >> arch/x86/kernel/kprobes/opt.c:396:6: error: dereferencing pointer to incomplete type
> > 
> > 32-bit appears to be the key pattern.
> 
> Ingo, please make sure your x86/jumplabel tree picked all of my patches.
> This 3/3 strongly depends on the previous 1/3 and 2/3.
> Without it, kprobes/opt.c can not be build because it still uses the
> text_poke_params data structure which 3/3 removes.

Yes I know, and it was on top of -tip which already had these included:

 51b2c07b2226 x86: Make jump_label use int3-based patching
 fd4363fff3d9 x86: Introduce int3 (breakpoint)-based instruction patching

without these the third patch wouldn't even apply I think.

Thanks,

	Ingo
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