* [PATCH] devtmpfs: Fix section mismatch on devtmpfsd()
@ 2011-08-04 22:36 Grant Likely
2011-08-04 22:54 ` Greg KH
0 siblings, 1 reply; 4+ messages in thread
From: Grant Likely @ 2011-08-04 22:36 UTC (permalink / raw)
To: Greg Kroah-Hartman, Linus Torvalds, Al Viro, linux-kernel; +Cc: Grant Likely
devtmpfsd_init() references setup_done which is __initdata, but
devtmpfsd() is not an __init function. The code is fine, because it
is never referenced after discarding __init sections, but it leaves
some additional code that can be discarded with the rest of __init and
it causes gcc to complain with a section mismatch warning.
This patch moves the discardable portion into a separate __init
function.
Compile tested on SPARC and ARM.
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
---
drivers/base/devtmpfs.c | 31 ++++++++++++++++++-------------
1 files changed, 18 insertions(+), 13 deletions(-)
diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c
index 33e1bed..5bf4f33 100644
--- a/drivers/base/devtmpfs.c
+++ b/drivers/base/devtmpfs.c
@@ -386,19 +386,8 @@ static int handle(const char *name, mode_t mode, struct device *dev)
return handle_remove(name, dev);
}
-static int devtmpfsd(void *p)
+static void devtmpfsd(void)
{
- char options[] = "mode=0755";
- int *err = p;
- *err = sys_unshare(CLONE_NEWNS);
- if (*err)
- goto out;
- *err = sys_mount("devtmpfs", "/", "devtmpfs", MS_SILENT, options);
- if (*err)
- goto out;
- sys_chdir("/.."); /* will traverse into overmounted root */
- sys_chroot(".");
- complete(&setup_done);
while (1) {
spin_lock(&req_lock);
while (requests) {
@@ -418,6 +407,22 @@ static int devtmpfsd(void *p)
schedule();
__set_current_state(TASK_RUNNING);
}
+}
+
+static int __init devtmpfsd_run(void *p)
+{
+ char options[] = "mode=0755";
+ int *err = p;
+ *err = sys_unshare(CLONE_NEWNS);
+ if (*err)
+ goto out;
+ *err = sys_mount("devtmpfs", "/", "devtmpfs", MS_SILENT, options);
+ if (*err)
+ goto out;
+ sys_chdir("/.."); /* will traverse into overmounted root */
+ sys_chroot(".");
+ complete(&setup_done);
+ devtmpfsd();
return 0;
out:
complete(&setup_done);
@@ -437,7 +442,7 @@ int __init devtmpfs_init(void)
return err;
}
- thread = kthread_run(devtmpfsd, &err, "kdevtmpfs");
+ thread = kthread_run(devtmpfsd_run, &err, "kdevtmpfs");
if (!IS_ERR(thread)) {
wait_for_completion(&setup_done);
} else {
--
1.7.4.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] devtmpfs: Fix section mismatch on devtmpfsd()
2011-08-04 22:36 [PATCH] devtmpfs: Fix section mismatch on devtmpfsd() Grant Likely
@ 2011-08-04 22:54 ` Greg KH
2011-08-04 23:32 ` Grant Likely
0 siblings, 1 reply; 4+ messages in thread
From: Greg KH @ 2011-08-04 22:54 UTC (permalink / raw)
To: Grant Likely; +Cc: Linus Torvalds, Al Viro, linux-kernel
On Thu, Aug 04, 2011 at 11:36:11PM +0100, Grant Likely wrote:
> devtmpfsd_init() references setup_done which is __initdata, but
> devtmpfsd() is not an __init function. The code is fine, because it
> is never referenced after discarding __init sections, but it leaves
> some additional code that can be discarded with the rest of __init and
> it causes gcc to complain with a section mismatch warning.
I have a simpler patch here that just removes the __initdata function,
which is simpler.
I hate the initdata stuff, it's almost always pointless...
Would that solve the problem for you as well?
thanks,
greg k-h
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] devtmpfs: Fix section mismatch on devtmpfsd()
2011-08-04 22:54 ` Greg KH
@ 2011-08-04 23:32 ` Grant Likely
2011-08-04 23:42 ` Greg KH
0 siblings, 1 reply; 4+ messages in thread
From: Grant Likely @ 2011-08-04 23:32 UTC (permalink / raw)
To: Greg KH; +Cc: Linus Torvalds, Al Viro, linux-kernel
On Thu, Aug 4, 2011 at 11:54 PM, Greg KH <gregkh@suse.de> wrote:
> On Thu, Aug 04, 2011 at 11:36:11PM +0100, Grant Likely wrote:
>> devtmpfsd_init() references setup_done which is __initdata, but
>> devtmpfsd() is not an __init function. The code is fine, because it
>> is never referenced after discarding __init sections, but it leaves
>> some additional code that can be discarded with the rest of __init and
>> it causes gcc to complain with a section mismatch warning.
>
> I have a simpler patch here that just removes the __initdata function,
> which is simpler.
>
> I hate the initdata stuff, it's almost always pointless...
initdata I don't mind. Discarding stuff that is no longer necessary
isn't a bad thing and I don't find it that onerous. __devinit* seems
less useful since I've never worked on a system that can actually
discard it.
> Would that solve the problem for you as well?
Sure. I was just doing random sparc builds and fixing up the bugs I
ran into. I'm happy with that solution too.
g.
g.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] devtmpfs: Fix section mismatch on devtmpfsd()
2011-08-04 23:32 ` Grant Likely
@ 2011-08-04 23:42 ` Greg KH
0 siblings, 0 replies; 4+ messages in thread
From: Greg KH @ 2011-08-04 23:42 UTC (permalink / raw)
To: Grant Likely; +Cc: Linus Torvalds, Al Viro, linux-kernel
On Fri, Aug 05, 2011 at 12:32:15AM +0100, Grant Likely wrote:
> On Thu, Aug 4, 2011 at 11:54 PM, Greg KH <gregkh@suse.de> wrote:
> > On Thu, Aug 04, 2011 at 11:36:11PM +0100, Grant Likely wrote:
> >> devtmpfsd_init() references setup_done which is __initdata, but
> >> devtmpfsd() is not an __init function. The code is fine, because it
> >> is never referenced after discarding __init sections, but it leaves
> >> some additional code that can be discarded with the rest of __init and
> >> it causes gcc to complain with a section mismatch warning.
> >
> > I have a simpler patch here that just removes the __initdata function,
> > which is simpler.
> >
> > I hate the initdata stuff, it's almost always pointless...
>
> initdata I don't mind. Discarding stuff that is no longer necessary
> isn't a bad thing and I don't find it that onerous. __devinit* seems
> less useful since I've never worked on a system that can actually
> discard it.
Yes, that's the one I really want to get rid of. One of these days on a
long flight I'll work up a series of patches to drop it...
thanks,
greg k-h
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2011-08-04 23:43 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2011-08-04 22:36 [PATCH] devtmpfs: Fix section mismatch on devtmpfsd() Grant Likely
2011-08-04 22:54 ` Greg KH
2011-08-04 23:32 ` Grant Likely
2011-08-04 23:42 ` Greg KH
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