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Date: Sun, 4 Mar 2018 04:23:55 +0800
From: kbuild test robot <fengguang.wu@...el.com>
To: Ingo Molnar <mingo@...nel.org>
Cc: kbuild-all@...org, linux-kernel@...r.kernel.org, tipbuild@...or.com
Subject: [tip:WIP.sched/core 19/20] arch/tile/include/asm/switch_to.h:36:0:
warning: "prepare_arch_switch" redefined
tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.sched/core
head: bb3aa6d89286e954fc5c670413c762dca3f4cc44
commit: 8c5e90d837fb1b1b0dda3db559b97bdab9c62853 [19/20] sched/headers: Simplify and clean up header usage in the scheduler
config: tile-tilegx_defconfig (attached as .config)
compiler: tilegx-linux-gcc (GCC) 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 8c5e90d837fb1b1b0dda3db559b97bdab9c62853
# save the attached .config to linux build tree
make.cross ARCH=tile
All warnings (new ones prefixed by >>):
In file included from kernel/sched/core.c:10:0:
>> arch/tile/include/asm/switch_to.h:36:0: warning: "prepare_arch_switch" redefined
#define prepare_arch_switch(next) _prepare_arch_switch(next)
In file included from kernel/sched/core.c:8:0:
kernel/sched/sched.h:1392:0: note: this is the location of the previous definition
# define prepare_arch_switch(next) do { } while (0)
In file included from kernel/sched/core.c:10:0:
>> arch/tile/include/asm/switch_to.h:58:0: warning: "finish_arch_post_lock_switch" redefined
#define finish_arch_post_lock_switch() do { \
In file included from kernel/sched/core.c:8:0:
kernel/sched/sched.h:1395:0: note: this is the location of the previous definition
# define finish_arch_post_lock_switch() do { } while (0)
--
In file included from kernel//sched/core.c:10:0:
>> arch/tile/include/asm/switch_to.h:36:0: warning: "prepare_arch_switch" redefined
#define prepare_arch_switch(next) _prepare_arch_switch(next)
In file included from kernel//sched/core.c:8:0:
kernel//sched/sched.h:1392:0: note: this is the location of the previous definition
# define prepare_arch_switch(next) do { } while (0)
In file included from kernel//sched/core.c:10:0:
>> arch/tile/include/asm/switch_to.h:58:0: warning: "finish_arch_post_lock_switch" redefined
#define finish_arch_post_lock_switch() do { \
In file included from kernel//sched/core.c:8:0:
kernel//sched/sched.h:1395:0: note: this is the location of the previous definition
# define finish_arch_post_lock_switch() do { } while (0)
vim +/prepare_arch_switch +36 arch/tile/include/asm/switch_to.h
bd119c69 David Howells 2012-03-28 32
bd119c69 David Howells 2012-03-28 33 /*
bd119c69 David Howells 2012-03-28 34 * Pause the DMA engine and static network before task switching.
bd119c69 David Howells 2012-03-28 35 */
bd119c69 David Howells 2012-03-28 @36 #define prepare_arch_switch(next) _prepare_arch_switch(next)
bd119c69 David Howells 2012-03-28 37 void _prepare_arch_switch(struct task_struct *next);
bd119c69 David Howells 2012-03-28 38
bd119c69 David Howells 2012-03-28 39 struct task_struct;
bd119c69 David Howells 2012-03-28 40 #define switch_to(prev, next, last) ((last) = _switch_to((prev), (next)))
bd119c69 David Howells 2012-03-28 41 extern struct task_struct *_switch_to(struct task_struct *prev,
bd119c69 David Howells 2012-03-28 42 struct task_struct *next);
bd119c69 David Howells 2012-03-28 43
bd119c69 David Howells 2012-03-28 44 /* Helper function for _switch_to(). */
bd119c69 David Howells 2012-03-28 45 extern struct task_struct *__switch_to(struct task_struct *prev,
bd119c69 David Howells 2012-03-28 46 struct task_struct *next,
bd119c69 David Howells 2012-03-28 47 unsigned long new_system_save_k_0);
bd119c69 David Howells 2012-03-28 48
bd119c69 David Howells 2012-03-28 49 /* Address that switched-away from tasks are at. */
bd119c69 David Howells 2012-03-28 50 extern unsigned long get_switch_to_pc(void);
bd119c69 David Howells 2012-03-28 51
bd119c69 David Howells 2012-03-28 52 /*
bd119c69 David Howells 2012-03-28 53 * Kernel threads can check to see if they need to migrate their
bd119c69 David Howells 2012-03-28 54 * stack whenever they return from a context switch; for user
bd119c69 David Howells 2012-03-28 55 * threads, we defer until they are returning to user-space.
fe363adb Chris Metcalf 2015-07-29 56 * We defer homecache migration until the runqueue lock is released.
bd119c69 David Howells 2012-03-28 57 */
fe363adb Chris Metcalf 2015-07-29 @58 #define finish_arch_post_lock_switch() do { \
1eaef888 Chris Metcalf 2015-08-05 59 __insn_mtspr(SPR_SIM_CONTROL, SIM_CONTROL_OS_SWITCH | \
1eaef888 Chris Metcalf 2015-08-05 60 (current->pid << _SIM_CONTROL_OPERATOR_BITS)); \
bd119c69 David Howells 2012-03-28 61 if (current->mm == NULL && !kstack_hash && \
fe363adb Chris Metcalf 2015-07-29 62 current_thread_info()->homecache_cpu != raw_smp_processor_id()) \
bd119c69 David Howells 2012-03-28 63 homecache_migrate_kthread(); \
bd119c69 David Howells 2012-03-28 64 } while (0)
bd119c69 David Howells 2012-03-28 65
:::::: The code at line 36 was first introduced by commit
:::::: bd119c69239322caafdb64517a806037d0d0c70a Disintegrate asm/system.h for Tile
:::::: TO: David Howells <dhowells@...hat.com>
:::::: CC: David Howells <dhowells@...hat.com>
---
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