linux-kernel - Re: linux-next: Tree for Sep 27 (uml 64-bit or 32-bit: tinyconfig)

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Date:   Tue, 27 Sep 2022 15:42:34 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     broonie@...nel.org,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-um <linux-um@...ts.infradead.org>
Subject: Re: linux-next: Tree for Sep 27 (uml 64-bit or 32-bit: tinyconfig)

On Tue, Sep 27, 2022 at 02:33:19PM -0700, Randy Dunlap wrote:
> 
> 
> On 9/27/22 14:28, Paul E. McKenney wrote:
> > On Tue, Sep 27, 2022 at 02:13:29PM -0700, Randy Dunlap wrote:
> >>
> >>
> >> On 9/27/22 13:10, broonie@...nel.org wrote:
> >>> Hi all,
> >>>
> >>> Changes since 20220923:
> >>>
> >>
> >> In file included from ../include/linux/notifier.h:16,
> >>                  from ../include/linux/memory_hotplug.h:7,
> >>                  from ../include/linux/mmzone.h:1244,
> >>                  from ../include/linux/gfp.h:7,
> >>                  from ../include/linux/slab.h:15,
> >>                  from ../include/linux/crypto.h:20,
> >>                  from ../arch/x86/um/shared/sysdep/kernel-offsets.h:5,
> >>                  from ../arch/um/kernel/asm-offsets.c:1:
> >> ../include/linux/srcu.h: In function ‘srcu_read_lock_nmisafe’:
> >> ../include/linux/srcu.h:181:26: error: implicit declaration of function ‘__srcu_read_lock_nmisafe’; did you mean ‘srcu_read_lock_nmisafe’? [-Werror=implicit-function-declaration]
> >>   181 |                 retval = __srcu_read_lock_nmisafe(ssp, true);
> >>       |                          ^~~~~~~~~~~~~~~~~~~~~~~~
> >>       |                          srcu_read_lock_nmisafe
> >> ../include/linux/srcu.h: In function ‘srcu_read_unlock_nmisafe’:
> >> ../include/linux/srcu.h:226:17: error: implicit declaration of function ‘__srcu_read_unlock_nmisafe’; did you mean ‘srcu_read_unlock_nmisafe’? [-Werror=implicit-function-declaration]
> >>   226 |                 __srcu_read_unlock_nmisafe(ssp, idx, true);
> >>       |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~
> >>       |                 srcu_read_unlock_nmisafe
> > 
> > Could you please send your .config or tell me how you generated it?
> 
> 
> For x86_64 SUBARCH, ARCH=um:
> 
> mkdir UML64
> make ARCH=um SUBARCH=x86_64 O=UML64 tinyconfig
> make ARCH=um SUBARCH=x86_64 O=UML64 all

Thank you!  The diff shown below clears it up for me.  Does it cover it
for you as well?

							Thanx, Paul

------------------------------------------------------------------------

diff --git a/include/linux/srcu.h b/include/linux/srcu.h
index 274d7200ce4e..565f60d57484 100644
--- a/include/linux/srcu.h
+++ b/include/linux/srcu.h
@@ -52,6 +52,8 @@ int init_srcu_struct(struct srcu_struct *ssp);
 #else
 /* Dummy definition for things like notifiers.  Actual use gets link error. */
 struct srcu_struct { };
+int __srcu_read_lock_nmisafe(struct srcu_struct *ssp, bool chknmisafe) __acquires(ssp);
+void __srcu_read_unlock_nmisafe(struct srcu_struct *ssp, int idx, bool chknmisafe) __releases(ssp);
 #endif
 
 void call_srcu(struct srcu_struct *ssp, struct rcu_head *head,