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Message-ID: <1d929941-2017-4137-990c-94453acd248f@linux.vnet.ibm.com>
Date: Mon, 4 Mar 2024 17:03:22 +0530
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Subject: Re: [revert 0d60d8df6f49] [net/net-next] [6.8-rc5] Build Failure
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To: Vadim Fedorenko <vadim.fedorenko@linux.dev>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        edumazet@google.com
Cc: arkadiusz.kubalewski@intel.com, jiri@nvidia.com, kuba@kernel.org,
        "abdhalee@linux.vnet.ibm.com" <abdhalee@linux.vnet.ibm.com>,
        "mputtash@linux.vnet.com" <mputtash@linux.vnet.com>,
        "sachinp@linux.vnet.com" <sachinp@linux.vnet.com>,
        venkat88@linux.vnet.ibm.com,
        "linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>
References: <3fcf3a2c-1c1b-42c1-bacb-78fdcd700389@linux.vnet.ibm.com>
 <85b78dad-affa-47c3-9cd0-79a4321460b8@linux.dev>
From: Tasmiya Nalatwad <tasmiya@linux.vnet.ibm.com>
In-Reply-To: <85b78dad-affa-47c3-9cd0-79a4321460b8@linux.dev>
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Greetings,

The build error is seen on linux-next and mainline also

Mainline : 6.8.0-rc7

linux-next : 6.8.0-rc7-next-20240304

--- Traces ---

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);

On 2/28/24 19:37, Vadim Fedorenko wrote:
> On 28/02/2024 11:09, Tasmiya Nalatwad wrote:
>> Greetings,
>>
>> [revert 0d60d8df6f49] [net/net-next] [6.8-rc5] Build Failure
>>
>> Reverting below commit fixes the issue
>>
>> commit 0d60d8df6f493bb46bf5db40d39dd60a1bafdd4e
>>      dpll: rely on rcu for netdev_dpll_pin()
>>
>> --- 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]
>>   }
>>
>
> Hi, Eric!
>
> Looks like we have to move struct dpll_pin definition to 
> include/linux/dpll.h to have this fixed, right?
>
>
-- 
Regards,
Tasmiya Nalatwad
IBM Linux Technology Center