Re: [linux-next:master 6386/7300] kernel/rcu/tree.c:2965:(.text+0x5b44): relocation truncated to fit: R_CKCORE_PCREL_IMM16BY4 against `__jump_table'

[Yujie Liu <yujie.liu@intel.com>]

Hi Paul,

On Thu, Dec 14, 2023 at 06:53:31AM -0800, Paul E. McKenney wrote:
> On Thu, Dec 14, 2023 at 09:25:29AM +0800, kernel test robot wrote:
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> > head:   48e8992e33abf054bcc0bb2e77b2d43bb899212e
> > commit: 4e58aaeebb3c27993c734c99eae6881b196b1ddb [6386/7300] rcu: Restrict access to RCU CPU stall notifiers
> > config: csky-randconfig-r013-20230826 (https://download.01.org/0day-ci/archive/20231214/202312140939.zA3tdSi2-lkp@intel.com/config)
> > compiler: csky-linux-gcc (GCC) 13.2.0
> > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231214/202312140939.zA3tdSi2-lkp@intel.com/reproduce)
> > 
> > If you fix the issue in a separate patch/commit (i.e. not just a new version of
> > the same patch/commit), kindly add following tags
> > | Reported-by: kernel test robot <lkp@intel.com>
> > | Closes: https://lore.kernel.org/oe-kbuild-all/202312140939.zA3tdSi2-lkp@intel.com/
> > 
> > All errors (new ones prefixed by >>):
> > 
> >    kernel/rcu/tree.o: in function `drain_page_cache':
> > >> kernel/rcu/tree.c:2965:(.text+0x5b44): relocation truncated to fit: R_CKCORE_PCREL_IMM16BY4 against `__jump_table'
> 
> I have questions.  ;-)
> 
> Is this something that I need to fix, or is this a problem with the
> csky toolchain?  If it is something that I need to fix, how exactly do
> I fix it?

This seems to be a general problem with csky arch and it is not caused
by the rcu patch. Please kindly ignore this report and we've configured
the bot to skip it. FYI, some similar cases:

[1] https://lore.kernel.org/oe-kbuild-all/ZX0Vv3IyOi+Bp10Q@casper.infradead.org/
[2] https://lore.kernel.org/oe-kbuild-all/202312152147.JntukftP-lkp@intel.com/
[3] https://lore.kernel.org/oe-kbuild-all/202312160759.X3dEVpgd-lkp@intel.com/

Best Regards,
Yujie

> 
> 							Thanx, Paul
> 
> >    kernel/rcu/tree.c:2968:(.text+0x5b5c): relocation truncated to fit: R_CKCORE_PCREL_IMM16BY4 against `__jump_table'
> >    kernel/rcu/tree.o: in function `kfree_rcu_shrink_scan':
> >    kernel/rcu/tree.c:3476:(.text+0x5b6a): relocation truncated to fit: R_CKCORE_PCREL_IMM16BY4 against `__jump_table'
> >    kernel/rcu/tree.o: in function `rcu_do_batch':
> >    kernel/rcu/tree.c:2102:(.text+0x5be6): relocation truncated to fit: R_CKCORE_PCREL_IMM16BY4 against `__jump_table'
> >    kernel/rcu/tree.c:2117:(.text+0x5c06): relocation truncated to fit: R_CKCORE_PCREL_IMM16BY4 against `__jump_table'
> >    kernel/rcu/tree.c:2119:(.text+0x5c22): relocation truncated to fit: R_CKCORE_PCREL_IMM16BY4 against `__jump_table'
> >    kernel/rcu/tree.c:2135:(.text+0x5c66): relocation truncated to fit: R_CKCORE_PCREL_IMM16BY4 against `__jump_table'
> >    kernel/rcu/tree.c:2144:(.text+0x5ca2): relocation truncated to fit: R_CKCORE_PCREL_IMM16BY4 against `__jump_table'
> >    kernel/rcu/tree.o: in function `rcu_lock_acquire':
> > >> include/linux/rcupdate.h:301:(.text+0x5cb2): relocation truncated to fit: R_CKCORE_PCREL_IMM16BY4 against `__jump_table'
> >    include/linux/rcupdate.h:301:(.text+0x5cce): relocation truncated to fit: R_CKCORE_PCREL_IMM16BY4 against `__jump_table'
> >    kernel/rcu/tree.o: in function `rcu_lock_release':
> >    include/linux/rcupdate.h:306:(.text+0x5cee): additional relocation overflows omitted from the output
> > 
> > 
> > vim +2965 kernel/rcu/tree.c
> > 
> > 53c72b590b3a0a Uladzislau Rezki (Sony  2020-05-25  2951) 
> > d0bfa8b3c411e2 Zhang Qiang             2021-04-15  2952  static int
> > d0bfa8b3c411e2 Zhang Qiang             2021-04-15  2953  drain_page_cache(struct kfree_rcu_cpu *krcp)
> > d0bfa8b3c411e2 Zhang Qiang             2021-04-15  2954  {
> > d0bfa8b3c411e2 Zhang Qiang             2021-04-15  2955  	unsigned long flags;
> > d0bfa8b3c411e2 Zhang Qiang             2021-04-15  2956  	struct llist_node *page_list, *pos, *n;
> > d0bfa8b3c411e2 Zhang Qiang             2021-04-15  2957  	int freed = 0;
> > 53c72b590b3a0a Uladzislau Rezki (Sony  2020-05-25  2958) 
> > 6b706e5603c44f Zqiang                  2023-04-18  2959  	if (!rcu_min_cached_objs)
> > 6b706e5603c44f Zqiang                  2023-04-18  2960  		return 0;
> > 6b706e5603c44f Zqiang                  2023-04-18  2961  
> > d0bfa8b3c411e2 Zhang Qiang             2021-04-15  2962  	raw_spin_lock_irqsave(&krcp->lock, flags);
> > d0bfa8b3c411e2 Zhang Qiang             2021-04-15  2963  	page_list = llist_del_all(&krcp->bkvcache);
> > ac7625ebd5f7ba Uladzislau Rezki (Sony  2021-04-15  2964) 	WRITE_ONCE(krcp->nr_bkv_objs, 0);
> > d0bfa8b3c411e2 Zhang Qiang             2021-04-15 @2965  	raw_spin_unlock_irqrestore(&krcp->lock, flags);
> > d0bfa8b3c411e2 Zhang Qiang             2021-04-15  2966  
> > d0bfa8b3c411e2 Zhang Qiang             2021-04-15  2967  	llist_for_each_safe(pos, n, page_list) {
> > d0bfa8b3c411e2 Zhang Qiang             2021-04-15  2968  		free_page((unsigned long)pos);
> > d0bfa8b3c411e2 Zhang Qiang             2021-04-15  2969  		freed++;
> > d0bfa8b3c411e2 Zhang Qiang             2021-04-15  2970  	}
> > 53c72b590b3a0a Uladzislau Rezki (Sony  2020-05-25  2971) 
> > d0bfa8b3c411e2 Zhang Qiang             2021-04-15  2972  	return freed;
> > 53c72b590b3a0a Uladzislau Rezki (Sony  2020-05-25  2973) }
> > 53c72b590b3a0a Uladzislau Rezki (Sony  2020-05-25  2974) 
> > 
> > :::::: The code at line 2965 was first introduced by commit
> > :::::: d0bfa8b3c411e25e014e4131d2804afe29c440a6 kvfree_rcu: Release a page cache under memory pressure
> > 
> > :::::: TO: Zhang Qiang <qiang.zhang@windriver.com>
> > :::::: CC: Paul E. McKenney <paulmck@kernel.org>
> > 
> > -- 
> > 0-DAY CI Kernel Test Service
> > https://github.com/intel/lkp-tests/wiki
>