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Message-ID: <202211230208.fD06OTAG-lkp@intel.com>
Date:   Wed, 23 Nov 2022 02:43:24 +0800
From:   kernel test robot <lkp@...el.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Jakob Koschel <jakobkoschel@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Cc:     oe-kbuild-all@...ts.linux.dev,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        Kevin Cernekee <cernekee@...il.com>,
        Jani Nikula <jani.nikula@...el.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>
Subject: Re: [PATCH v3 1/4] i915: Move list_count() to list.h for broader use

Hi Andy,

I love your patch! Yet something to improve:

[auto build test ERROR on usb/usb-testing]
[also build test ERROR on usb/usb-next usb/usb-linus drm-intel/for-linux-next drm-intel/for-linux-next-fixes linus/master v6.1-rc6 next-20221122]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Andy-Shevchenko/i915-Move-list_count-to-list-h-for-broader-use/20221122-233657
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
patch link:    https://lore.kernel.org/r/20221122153516.52577-1-andriy.shevchenko%40linux.intel.com
patch subject: [PATCH v3 1/4] i915: Move list_count() to list.h for broader use
config: s390-defconfig
compiler: s390-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/3d217ef769536f160f5c20224aeb0f9070bdfdcf
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Andy-Shevchenko/i915-Move-list_count-to-list-h-for-broader-use/20221122-233657
        git checkout 3d217ef769536f160f5c20224aeb0f9070bdfdcf
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=s390 prepare

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   scripts/genksyms/parse.y: warning: 9 shift/reduce conflicts [-Wconflicts-sr]
   scripts/genksyms/parse.y: warning: 5 reduce/reduce conflicts [-Wconflicts-rr]
   scripts/genksyms/parse.y: note: rerun with option '-Wcounterexamples' to generate conflict counterexamples
   In file included from include/linux/preempt.h:11,
                    from include/linux/percpu.h:6,
                    from include/linux/context_tracking_state.h:5,
                    from include/linux/hardirq.h:5,
                    from include/linux/kvm_host.h:7,
                    from arch/s390/kernel/asm-offsets.c:11:
   include/linux/list.h:662:8: warning: no previous prototype for 'list_count' [-Wmissing-prototypes]
     662 | size_t list_count(struct list_head *head)
         |        ^~~~~~~~~~
   In file included from include/linux/preempt.h:11,
                    from arch/s390/include/asm/timex.h:13,
                    from arch/s390/kernel/vdso64/getcpu.c:6:
   include/linux/list.h:662:8: warning: no previous prototype for 'list_count' [-Wmissing-prototypes]
     662 | size_t list_count(struct list_head *head)
         |        ^~~~~~~~~~
   In file included from include/linux/rculist.h:10,
                    from include/linux/pid.h:5,
                    from include/linux/sched.h:14,
                    from arch/s390/include/asm/syscall.h:13,
                    from arch/s390/include/asm/vdso/gettimeofday.h:9,
                    from include/vdso/datapage.h:137,
                    from arch/s390/kernel/vdso64/../../../../lib/vdso/gettimeofday.c:5,
                    from arch/s390/kernel/vdso64/vdso64_generic.c:2:
   include/linux/list.h:662:8: warning: no previous prototype for 'list_count' [-Wmissing-prototypes]
     662 | size_t list_count(struct list_head *head)
         |        ^~~~~~~~~~
   s390-linux-ld: arch/s390/kernel/vdso64/getcpu.o: in function `list_count':
>> include/linux/list.h:663: multiple definition of `list_count'; arch/s390/kernel/vdso64/vdso64_generic.o:include/linux/list.h:663: first defined here
   make[2]: *** [arch/s390/kernel/vdso64/Makefile:50: arch/s390/kernel/vdso64/vdso64.so.dbg] Error 1
   make[2]: Target 'include/generated/vdso64-offsets.h' not remade because of errors.
   make[1]: *** [arch/s390/Makefile:159: vdso_prepare] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:231: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.


vim +663 include/linux/list.h

   557	
   558	/**
   559	 * list_next_entry - get the next element in list
   560	 * @pos:	the type * to cursor
   561	 * @member:	the name of the list_head within the struct.
   562	 */
   563	#define list_next_entry(pos, member) \
   564		list_entry((pos)->member.next, typeof(*(pos)), member)
   565	
   566	/**
   567	 * list_next_entry_circular - get the next element in list
   568	 * @pos:	the type * to cursor.
   569	 * @head:	the list head to take the element from.
   570	 * @member:	the name of the list_head within the struct.
   571	 *
   572	 * Wraparound if pos is the last element (return the first element).
   573	 * Note, that list is expected to be not empty.
   574	 */
   575	#define list_next_entry_circular(pos, head, member) \
   576		(list_is_last(&(pos)->member, head) ? \
   577		list_first_entry(head, typeof(*(pos)), member) : list_next_entry(pos, member))
   578	
   579	/**
   580	 * list_prev_entry - get the prev element in list
   581	 * @pos:	the type * to cursor
   582	 * @member:	the name of the list_head within the struct.
   583	 */
   584	#define list_prev_entry(pos, member) \
   585		list_entry((pos)->member.prev, typeof(*(pos)), member)
   586	
   587	/**
   588	 * list_prev_entry_circular - get the prev element in list
   589	 * @pos:	the type * to cursor.
   590	 * @head:	the list head to take the element from.
   591	 * @member:	the name of the list_head within the struct.
   592	 *
   593	 * Wraparound if pos is the first element (return the last element).
   594	 * Note, that list is expected to be not empty.
   595	 */
   596	#define list_prev_entry_circular(pos, head, member) \
   597		(list_is_first(&(pos)->member, head) ? \
   598		list_last_entry(head, typeof(*(pos)), member) : list_prev_entry(pos, member))
   599	
   600	/**
   601	 * list_for_each	-	iterate over a list
   602	 * @pos:	the &struct list_head to use as a loop cursor.
   603	 * @head:	the head for your list.
   604	 */
   605	#define list_for_each(pos, head) \
   606		for (pos = (head)->next; !list_is_head(pos, (head)); pos = pos->next)
   607	
   608	/**
   609	 * list_for_each_rcu - Iterate over a list in an RCU-safe fashion
   610	 * @pos:	the &struct list_head to use as a loop cursor.
   611	 * @head:	the head for your list.
   612	 */
   613	#define list_for_each_rcu(pos, head)		  \
   614		for (pos = rcu_dereference((head)->next); \
   615		     !list_is_head(pos, (head)); \
   616		     pos = rcu_dereference(pos->next))
   617	
   618	/**
   619	 * list_for_each_continue - continue iteration over a list
   620	 * @pos:	the &struct list_head to use as a loop cursor.
   621	 * @head:	the head for your list.
   622	 *
   623	 * Continue to iterate over a list, continuing after the current position.
   624	 */
   625	#define list_for_each_continue(pos, head) \
   626		for (pos = pos->next; !list_is_head(pos, (head)); pos = pos->next)
   627	
   628	/**
   629	 * list_for_each_prev	-	iterate over a list backwards
   630	 * @pos:	the &struct list_head to use as a loop cursor.
   631	 * @head:	the head for your list.
   632	 */
   633	#define list_for_each_prev(pos, head) \
   634		for (pos = (head)->prev; !list_is_head(pos, (head)); pos = pos->prev)
   635	
   636	/**
   637	 * list_for_each_safe - iterate over a list safe against removal of list entry
   638	 * @pos:	the &struct list_head to use as a loop cursor.
   639	 * @n:		another &struct list_head to use as temporary storage
   640	 * @head:	the head for your list.
   641	 */
   642	#define list_for_each_safe(pos, n, head) \
   643		for (pos = (head)->next, n = pos->next; \
   644		     !list_is_head(pos, (head)); \
   645		     pos = n, n = pos->next)
   646	
   647	/**
   648	 * list_for_each_prev_safe - iterate over a list backwards safe against removal of list entry
   649	 * @pos:	the &struct list_head to use as a loop cursor.
   650	 * @n:		another &struct list_head to use as temporary storage
   651	 * @head:	the head for your list.
   652	 */
   653	#define list_for_each_prev_safe(pos, n, head) \
   654		for (pos = (head)->prev, n = pos->prev; \
   655		     !list_is_head(pos, (head)); \
   656		     pos = n, n = pos->prev)
   657	
   658	/**
   659	 * list_count - count nodes in the list
   660	 * @head:	the head for your list.
   661	 */
   662	size_t list_count(struct list_head *head)
 > 663	{
   664		struct list_head *pos;
   665		size_t count = 0;
   666	
   667		list_for_each(pos, head)
   668			count++;
   669	
   670		return count;
   671	}
   672	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp

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