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Message-ID: <875xy8103a.fsf@mail.lhotse>
Date: Thu, 29 Feb 2024 13:22:01 +1100
From: Michael Ellerman <mpe@...ux.ibm.com>
To: Tasmiya Nalatwad <tasmiya@...ux.ibm.com>,
"linux-kernel@...r.kernel.org"
<linux-kernel@...r.kernel.org>,
"linuxppc-dev@...ts.ozlabs.org"
<linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [netdev] Build failure on powerpc
Tasmiya Nalatwad <tasmiya@...ux.vnet.ibm.com> writes:
> Greetings,
>
> [netdev] Build failure on powerpc
> latest netdev 6.8.0-rc5-auto-g1ce7d306ea63 fails to build on powerpc
> below traces
Please include the defconfig you're building, and the toolchain
versions, in reports like this.
I wasn't able to reproduce this failure here.
cheers
> --- Traces---
>
> /include/linux/dpll.h: In function ‘netdev_dpll_pin’:
> /include/linux/rcupdate.h:439:9: error: dereferencing pointer to
> incomplete type ‘struct dpll_pin’
> typeof(*p) *local = (typeof(*p) *__force)READ_ONCE(p); \
> ^
> /include/linux/rcupdate.h:587:2: note: in expansion of macro
> ‘__rcu_dereference_check’
> __rcu_dereference_check((p), __UNIQUE_ID(rcu), \
> ^~~~~~~~~~~~~~~~~~~~~~~
> /include/linux/rtnetlink.h:70:2: note: in expansion of macro
> ‘rcu_dereference_check’
> rcu_dereference_check(p, lockdep_rtnl_is_held())
> ^~~~~~~~~~~~~~~~~~~~~
> /include/linux/dpll.h:175:9: note: in expansion of macro
> ‘rcu_dereference_rtnl’
> return rcu_dereference_rtnl(dev->dpll_pin);
> ^~~~~~~~~~~~~~~~~~~~
> make[4]: *** [scripts/Makefile.build:243: drivers/dpll/dpll_core.o] Error 1
> make[4]: *** Waiting for unfinished jobs....
> AR net/mpls/built-in.a
> AR net/l3mdev/built-in.a
> In file included from ./include/linux/rbtree.h:24,
> from ./include/linux/mm_types.h:11,
> from ./include/linux/mmzone.h:22,
> from ./include/linux/gfp.h:7,
> from ./include/linux/umh.h:4,
> from ./include/linux/kmod.h:9,
> from ./include/linux/module.h:17,
> from drivers/dpll/dpll_netlink.c:9:
> /include/linux/dpll.h: In function ‘netdev_dpll_pin’:
> /include/linux/rcupdate.h:439:9: error: dereferencing pointer to
> incomplete type ‘struct dpll_pin’
> typeof(*p) *local = (typeof(*p) *__force)READ_ONCE(p); \
> ^
> /include/linux/rcupdate.h:587:2: note: in expansion of macro
> ‘__rcu_dereference_check’
> __rcu_dereference_check((p), __UNIQUE_ID(rcu), \
> ^~~~~~~~~~~~~~~~~~~~~~~
> /include/linux/rtnetlink.h:70:2: note: in expansion of macro
> ‘rcu_dereference_check’
> rcu_dereference_check(p, lockdep_rtnl_is_held())
> ^~~~~~~~~~~~~~~~~~~~~
> /include/linux/dpll.h:175:9: note: in expansion of macro
> ‘rcu_dereference_rtnl’
> return rcu_dereference_rtnl(dev->dpll_pin);
> ^~~~~~~~~~~~~~~~~~~~
> make[4]: *** [scripts/Makefile.build:243: drivers/dpll/dpll_netlink.o]
> Error 1
> make[3]: *** [scripts/Makefile.build:481: drivers/dpll] Error 2
> make[3]: *** Waiting for unfinished jobs....
> In file included from ./arch/powerpc/include/generated/asm/rwonce.h:1,
> from ./include/linux/compiler.h:251,
> from ./include/linux/instrumented.h:10,
> from ./include/linux/uaccess.h:6,
> from net/core/dev.c:71:
> net/core/dev.c: In function ‘netdev_dpll_pin_assign’:
> /include/linux/rcupdate.h:462:36: error: dereferencing pointer to
> incomplete type ‘struct dpll_pin’
> #define RCU_INITIALIZER(v) (typeof(*(v)) __force __rcu *)(v)
> ^~~~
> /include/asm-generic/rwonce.h:55:33: note: in definition of macro
> ‘__WRITE_ONCE’
> *(volatile typeof(x) *)&(x) = (val); \
> ^~~
> /arch/powerpc/include/asm/barrier.h:76:2: note: in expansion of macro
> ‘WRITE_ONCE’
> WRITE_ONCE(*p, v); \
> ^~~~~~~~~~
> /include/asm-generic/barrier.h:172:55: note: in expansion of macro
> ‘__smp_store_release’
> #define smp_store_release(p, v) do { kcsan_release();
> __smp_store_release(p, v); } while (0)
> ^~~~~~~~~~~~~~~~~~~
> /include/linux/rcupdate.h:503:3: note: in expansion of macro
> ‘smp_store_release’
> smp_store_release(&p, RCU_INITIALIZER((typeof(p))_r_a_p__v)); \
> ^~~~~~~~~~~~~~~~~
> /include/linux/rcupdate.h:503:25: note: in expansion of macro
> ‘RCU_INITIALIZER’
> smp_store_release(&p, RCU_INITIALIZER((typeof(p))_r_a_p__v)); \
> ^~~~~~~~~~~~~~~
> net/core/dev.c:9081:2: note: in expansion of macro ‘rcu_assign_pointer’
> rcu_assign_pointer(dev->dpll_pin, dpll_pin);
> ^~~~~~~~~~~~~~~~~~
> make[4]: *** [scripts/Makefile.build:243: net/core/dev.o] Error 1
> make[4]: *** Waiting for unfinished jobs....
> AR drivers/net/ethernet/built-in.a
> AR drivers/net/built-in.a
> AR net/dcb/built-in.a
> AR net/netlabel/built-in.a
> AR net/strparser/built-in.a
> AR net/handshake/built-in.a
> GEN lib/test_fortify.log
> AR net/8021q/built-in.a
> AR net/nsh/built-in.a
> AR net/unix/built-in.a
> CC lib/string.o
> AR net/packet/built-in.a
> AR net/switchdev/built-in.a
> AR lib/lib.a
> AR net/mptcp/built-in.a
> AR net/devlink/built-in.a
> In file included from ./include/linux/rbtree.h:24,
> from ./include/linux/mm_types.h:11,
> from ./include/linux/mmzone.h:22,
> from ./include/linux/gfp.h:7,
> from ./include/linux/umh.h:4,
> from ./include/linux/kmod.h:9,
> from ./include/linux/module.h:17,
> from net/core/rtnetlink.c:17:
> /include/linux/dpll.h: In function ‘netdev_dpll_pin’:
> /include/linux/rcupdate.h:439:9: error: dereferencing pointer to
> incomplete type ‘struct dpll_pin’
> typeof(*p) *local = (typeof(*p) *__force)READ_ONCE(p); \
> ^
> /include/linux/rcupdate.h:587:2: note: in expansion of macro
> ‘__rcu_dereference_check’
> __rcu_dereference_check((p), __UNIQUE_ID(rcu), \
> ^~~~~~~~~~~~~~~~~~~~~~~
> /include/linux/rtnetlink.h:70:2: note: in expansion of macro
> ‘rcu_dereference_check’
> rcu_dereference_check(p, lockdep_rtnl_is_held())
> ^~~~~~~~~~~~~~~~~~~~~
> /include/linux/dpll.h:175:9: note: in expansion of macro
> ‘rcu_dereference_rtnl’
> return rcu_dereference_rtnl(dev->dpll_pin);
> ^~~~~~~~~~~~~~~~~~~~
> In file included from net/core/rtnetlink.c:60:
> /include/linux/dpll.h:179:1: error: control reaches end of non-void
> function [-Werror=return-type]
> }
>
>
> Reverting the below commit fixes the problem
>
> commit 0d60d8df6f493bb46bf5db40d39dd60a1bafdd4e
> dpll: rely on rcu for netdev_dpll_pin()
>
> --
> Regards,
> Tasmiya Nalatwad
> IBM Linux Technology Center
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