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Subject[tip:WIP.sched/core 19/22] kernel/sched/core.c:2836:18: error: passing argument 1 of 'mips_install_watch_registers' from incompatible pointer type
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.sched/core
head: ffce6fffa0033fa54d1bac1c7494862b71316978
commit: ecaf52c9ec5ad31395e5c06c01e293ebcf0e4350 [19/22] sched/headers: Simplify and clean up header usage in the scheduler
config: mips-jz4740 (attached as .config)
compiler: mipsel-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
git checkout ecaf52c9ec5ad31395e5c06c01e293ebcf0e4350
# save the attached .config to linux build tree
make.cross ARCH=mips

All error/warnings (new ones prefixed by >>):

In file included from arch/mips/include/asm/switch_to.h:16:0,
from kernel/sched/core.c:8:
>> arch/mips/include/asm/watch.h:15:42: warning: 'struct task_struct' declared inside parameter list will not be visible outside of this definition or declaration
void mips_install_watch_registers(struct task_struct *t);
^~~~~~~~~~~
In file included from arch/mips/include/asm/switch_to.h:16:0,
from kernel/sched/core.c:8:
kernel/sched/core.c: In function 'context_switch':
>> kernel/sched/core.c:2836:18: error: passing argument 1 of 'mips_install_watch_registers' from incompatible pointer type [-Werror=incompatible-pointer-types]
switch_to(prev, next, prev);
^
arch/mips/include/asm/watch.h:24:32: note: in definition of macro '__restore_watch'
mips_install_watch_registers(task); \
^~~~
kernel/sched/core.c:2836:2: note: in expansion of macro 'switch_to'
switch_to(prev, next, prev);
^~~~~~~~~
arch/mips/include/asm/watch.h:15:6: note: expected 'struct task_struct *' but argument is of type 'struct task_struct *'
void mips_install_watch_registers(struct task_struct *t);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
--
In file included from arch/mips/include/asm/switch_to.h:16:0,
from kernel//sched/core.c:8:
>> arch/mips/include/asm/watch.h:15:42: warning: 'struct task_struct' declared inside parameter list will not be visible outside of this definition or declaration
void mips_install_watch_registers(struct task_struct *t);
^~~~~~~~~~~
In file included from arch/mips/include/asm/switch_to.h:16:0,
from kernel//sched/core.c:8:
kernel//sched/core.c: In function 'context_switch':
kernel//sched/core.c:2836:18: error: passing argument 1 of 'mips_install_watch_registers' from incompatible pointer type [-Werror=incompatible-pointer-types]
switch_to(prev, next, prev);
^
arch/mips/include/asm/watch.h:24:32: note: in definition of macro '__restore_watch'
mips_install_watch_registers(task); \
^~~~
kernel//sched/core.c:2836:2: note: in expansion of macro 'switch_to'
switch_to(prev, next, prev);
^~~~~~~~~
arch/mips/include/asm/watch.h:15:6: note: expected 'struct task_struct *' but argument is of type 'struct task_struct *'
void mips_install_watch_registers(struct task_struct *t);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors

vim +/mips_install_watch_registers +2836 kernel/sched/core.c

^1da177e kernel/sched.c Linus Torvalds 2005-04-16 2791
^1da177e kernel/sched.c Linus Torvalds 2005-04-16 2792 /*
dfa50b60 kernel/sched/core.c Oleg Nesterov 2014-10-09 2793 * context_switch - switch to the new MM and the new thread's register state.
^1da177e kernel/sched.c Linus Torvalds 2005-04-16 2794 */
04936948 kernel/sched/core.c Josh Poimboeuf 2016-02-28 2795 static __always_inline struct rq *
70b97a7f kernel/sched.c Ingo Molnar 2006-07-03 2796 context_switch(struct rq *rq, struct task_struct *prev,
d8ac8971 kernel/sched/core.c Matt Fleming 2016-09-21 2797 struct task_struct *next, struct rq_flags *rf)
^1da177e kernel/sched.c Linus Torvalds 2005-04-16 2798 {
dd41f596 kernel/sched.c Ingo Molnar 2007-07-09 2799 struct mm_struct *mm, *oldmm;
^1da177e kernel/sched.c Linus Torvalds 2005-04-16 2800
e107be36 kernel/sched.c Avi Kivity 2007-07-26 2801 prepare_task_switch(rq, prev, next);
fe4b04fa kernel/sched.c Peter Zijlstra 2011-02-02 2802
dd41f596 kernel/sched.c Ingo Molnar 2007-07-09 2803 mm = next->mm;
dd41f596 kernel/sched.c Ingo Molnar 2007-07-09 2804 oldmm = prev->active_mm;
9226d125 kernel/sched.c Zachary Amsden 2007-02-13 2805 /*
9226d125 kernel/sched.c Zachary Amsden 2007-02-13 2806 * For paravirt, this is coupled with an exit in switch_to to
9226d125 kernel/sched.c Zachary Amsden 2007-02-13 2807 * combine the page table reload and the switch backend into
9226d125 kernel/sched.c Zachary Amsden 2007-02-13 2808 * one hypercall.
9226d125 kernel/sched.c Zachary Amsden 2007-02-13 2809 */
224101ed kernel/sched.c Jeremy Fitzhardinge 2009-02-18 2810 arch_start_context_switch(prev);
9226d125 kernel/sched.c Zachary Amsden 2007-02-13 2811
306e0604 kernel/sched/core.c Mathieu Desnoyers 2018-01-29 2812 /*
306e0604 kernel/sched/core.c Mathieu Desnoyers 2018-01-29 2813 * If mm is non-NULL, we pass through switch_mm(). If mm is
306e0604 kernel/sched/core.c Mathieu Desnoyers 2018-01-29 2814 * NULL, we will pass through mmdrop() in finish_task_switch().
306e0604 kernel/sched/core.c Mathieu Desnoyers 2018-01-29 2815 * Both of these contain the full memory barrier required by
306e0604 kernel/sched/core.c Mathieu Desnoyers 2018-01-29 2816 * membarrier after storing to rq->curr, before returning to
306e0604 kernel/sched/core.c Mathieu Desnoyers 2018-01-29 2817 * user-space.
306e0604 kernel/sched/core.c Mathieu Desnoyers 2018-01-29 2818 */
31915ab4 kernel/sched.c Heiko Carstens 2010-09-16 2819 if (!mm) {
^1da177e kernel/sched.c Linus Torvalds 2005-04-16 2820 next->active_mm = oldmm;
f1f10076 kernel/sched/core.c Vegard Nossum 2017-02-27 2821 mmgrab(oldmm);
^1da177e kernel/sched.c Linus Torvalds 2005-04-16 2822 enter_lazy_tlb(oldmm, next);
^1da177e kernel/sched.c Linus Torvalds 2005-04-16 2823 } else
f98db601 kernel/sched/core.c Andy Lutomirski 2016-04-26 2824 switch_mm_irqs_off(oldmm, mm, next);
^1da177e kernel/sched.c Linus Torvalds 2005-04-16 2825
31915ab4 kernel/sched.c Heiko Carstens 2010-09-16 2826 if (!prev->mm) {
^1da177e kernel/sched.c Linus Torvalds 2005-04-16 2827 prev->active_mm = NULL;
^1da177e kernel/sched.c Linus Torvalds 2005-04-16 2828 rq->prev_mm = oldmm;
^1da177e kernel/sched.c Linus Torvalds 2005-04-16 2829 }
92509b73 kernel/sched/core.c Matt Fleming 2016-09-21 2830
cb42c9a3 kernel/sched/core.c Matt Fleming 2016-09-21 2831 rq->clock_update_flags &= ~(RQCF_ACT_SKIP|RQCF_REQ_SKIP);
92509b73 kernel/sched/core.c Matt Fleming 2016-09-21 2832
269d5992 kernel/sched/core.c Peter Zijlstra 2018-02-06 2833 prepare_lock_switch(rq, next, rf);
^1da177e kernel/sched.c Linus Torvalds 2005-04-16 2834
^1da177e kernel/sched.c Linus Torvalds 2005-04-16 2835 /* Here we just switch the register state and the stack. */
^1da177e kernel/sched.c Linus Torvalds 2005-04-16 @2836 switch_to(prev, next, prev);
dd41f596 kernel/sched.c Ingo Molnar 2007-07-09 2837 barrier();
dfa50b60 kernel/sched/core.c Oleg Nesterov 2014-10-09 2838
dfa50b60 kernel/sched/core.c Oleg Nesterov 2014-10-09 2839 return finish_task_switch(prev);
^1da177e kernel/sched.c Linus Torvalds 2005-04-16 2840 }
f711f609 kernel/sched.c Gautham R Shenoy 2009-04-14 2841

:::::: The code at line 2836 was first introduced by commit
:::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2

:::::: TO: Linus Torvalds <torvalds@ppc970.osdl.org>
:::::: CC: Linus Torvalds <torvalds@ppc970.osdl.org>

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