Re: [patch 1/2] kcmp: Make it to depend on CONFIG_KCMP

From: Cyrill Gorcunov
Date: Tue Feb 19 2013 - 17:15:55 EST

On Wed, Feb 20, 2013 at 02:11:46AM +0400, Cyrill Gorcunov wrote:
> On Tue, Feb 19, 2013 at 02:00:35PM -0800, Andrew Morton wrote:
> > >
> > > I think this syscall is usefull even without c/r stuff.
> > > That's why I made it with separate config option.
> >
> > hm, OK.
> >
> > But the patch also permits CONFIG_CHECKPOINT_RESTORE=y, CONFIG_KCMP=n
> > which surely isn't something which CRIU wants to support?
> Hmm, yes from one pov this feature is useful for out-of-c/r user,
> from another pov -- we will have to ask users to turn on additional
> CONFIG entries (which i'm sure not set by default in wide range of distros).
> Thus it seems less paiful way is either make it obj-(CHECKPOINT_RESTORE)
> as you proposed, or obj-y by default. The last can't be undone, so I'll
> prepare the patch for obj-(CHECKPOINT_RESTORE) I think.

Here is update. Peter, does it look good for you too?
From: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
Subject: kcmp: Make it to depend on CHECKPOINT_RESTORE

Since kcmp syscall has been implemented (initially on x86
architecture) a number of other archs wire it up as well:
xtensa, sparc, sh, s390, mips, microblaze, m68k (not taking
into account those who uses <asm-generic/unistd.h> for syscall
numbers definitions).

But the Makefile, which turns kcmp.o generation on still
depends on former config-x86. Thus get rid of this
limitation and make kcmp.o depend on CHECKPOINT_RESTORE

Signed-off-by: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
Cc: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Cc: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
Cc: Andrey Vagin <avagin@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Glauber Costa <glommer@xxxxxxxxxxxxx>
Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: Matt Helsley <matthltc@xxxxxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Eric Dumazet <eric.dumazet@xxxxxxxxx>
Cc: Vasiliy Kulikov <segoon@xxxxxxxxxxxx>
Cc: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Cc: Valdis.Kletnieks@xxxxxx
Cc: Michal Marek <mmarek@xxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
kernel/Makefile | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)

Index: linux-2.6.git/kernel/Makefile
--- linux-2.6.git.orig/kernel/Makefile
+++ linux-2.6.git/kernel/Makefile
@@ -25,9 +25,7 @@ endif
obj-y += sched/
obj-y += power/

-obj-$(CONFIG_X86) += kcmp.o
+obj-$(CHECKPOINT_RESTORE) += kcmp.o
obj-$(CONFIG_FREEZER) += freezer.o
obj-$(CONFIG_PROFILING) += profile.o
obj-$(CONFIG_STACKTRACE) += stacktrace.o
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