tree: https://git.kernel.org/pub/scm/linux/kernel/git/jfern/linux.git coresched head: 0cae4d526e66a8aa5f8b3626045be344860e9b8d commit: 0cae4d526e66a8aa5f8b3626045be344860e9b8d [12/12] FIXUP: Add a ht_protect= kernel cmdline option. config: i386-randconfig-s002-20210115 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-208-g46a52ca4-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/jfern/linux.git/commit/?i... git remote add jfern https://git.kernel.org/pub/scm/linux/kernel/git/jfern/linux.git git fetch --no-tags jfern coresched git checkout 0cae4d526e66a8aa5f8b3626045be344860e9b8d # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): In file included from kernel/entry/common.c:4: 452 | static inline bool entry_kernel_protected(enum ht_protect_ctx ctx) | ^~~~~~~~~~~~~~ include/linux/entry-common.h:452:63: error: parameter 1 ('ctx') has incomplete type 452 | static inline bool entry_kernel_protected(enum ht_protect_ctx ctx) | ~~~~~~~~~~~~~~~~~~~~^~~ include/linux/entry-common.h:452:20: error: function declaration isn't a prototype [-Werror=strict-prototypes] 452 | static inline bool entry_kernel_protected(enum ht_protect_ctx ctx) | ^~~~~~~~~~~~~~~~~~~~~~ In file included from include/linux/context_tracking.h:5, from kernel/entry/common.c:3: include/linux/entry-common.h: In function 'entry_kernel_protected': include/linux/sched.h:2099:45: error: expected expression before 'do' 2099 | #define sched_core_kernel_protected(ignore) do { } while (0) | ^~ include/linux/entry-common.h:456:9: note: in expansion of macro 'sched_core_kernel_protected' 456 | return sched_core_kernel_protected(ctx) && _TIF_UNSAFE_RET != 0; | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/entry/common.c: At top level: 22 | enum ht_protect_ctx ctx) | ^~~~~~~~~~~~~~ kernel/entry/common.c:22:28: error: parameter 2 ('ctx') has incomplete type 22 | enum ht_protect_ctx ctx) | ~~~~~~~~~~~~~~~~~~~~^~~ kernel/entry/common.c:21:29: error: function declaration isn't a prototype [-Werror=strict-prototypes] 21 | static __always_inline void enter_from_user_mode(struct pt_regs *regs, | ^~~~~~~~~~~~~~~~~~~~ kernel/entry/common.c: In function 'syscall_enter_from_user_mode': kernel/entry/common.c:99:29: error: 'HT_PROTECT_SYSCALL' undeclared (first use in this function) 99 | enter_from_user_mode(regs, HT_PROTECT_SYSCALL); | ^~~~~~~~~~~~~~~~~~ kernel/entry/common.c:99:29: note: each undeclared identifier is reported only once for each function it appears in kernel/entry/common.c: In function 'syscall_enter_from_user_mode_prepare': kernel/entry/common.c:111:29: error: 'HT_PROTECT_SYSCALL' undeclared (first use in this function) 111 | enter_from_user_mode(regs, HT_PROTECT_SYSCALL); | ^~~~~~~~~~~~~~~~~~ kernel/entry/common.c: At top level: kernel/entry/common.c:152:49: warning: 'enum ht_protect_ctx' declared inside parameter list will not be visible outside of this definition or declaration 152 | static unsigned long exit_to_user_get_work(enum ht_protect_ctx ctx) | ^~~~~~~~~~~~~~ kernel/entry/common.c:152:64: error: parameter 1 ('ctx') has incomplete type 152 | static unsigned long exit_to_user_get_work(enum ht_protect_ctx ctx) | ~~~~~~~~~~~~~~~~~~~~^~~ kernel/entry/common.c:152:22: error: function declaration isn't a prototype [-Werror=strict-prototypes] 152 | static unsigned long exit_to_user_get_work(enum ht_protect_ctx ctx) | ^~~~~~~~~~~~~~~~~~~~~ kernel/entry/common.c:174:15: warning: 'enum ht_protect_ctx' declared inside parameter list will not be visible outside of this definition or declaration 174 | enum ht_protect_ctx ctx) | ^~~~~~~~~~~~~~ kernel/entry/common.c:174:30: error: parameter 3 ('ctx') has incomplete type 174 | enum ht_protect_ctx ctx) | ~~~~~~~~~~~~~~~~~~~~^~~ kernel/entry/common.c:172:22: error: function declaration isn't a prototype [-Werror=strict-prototypes] 172 | static unsigned long exit_to_user_mode_loop(struct pt_regs *regs, | ^~~~~~~~~~~~~~~~~~~~~~ kernel/entry/common.c:217:66: warning: 'enum ht_protect_ctx' declared inside parameter list will not be visible outside of this definition or declaration 217 | static void exit_to_user_mode_prepare(struct pt_regs *regs, enum ht_protect_ctx ctx) | ^~~~~~~~~~~~~~ kernel/entry/common.c:217:81: error: parameter 2 ('ctx') has incomplete type 217 | static void exit_to_user_mode_prepare(struct pt_regs *regs, enum ht_protect_ctx ctx) | ~~~~~~~~~~~~~~~~~~~~^~~ kernel/entry/common.c:217:13: error: function declaration isn't a prototype [-Werror=strict-prototypes] 217 | static void exit_to_user_mode_prepare(struct pt_regs *regs, enum ht_protect_ctx ctx) | ^~~~~~~~~~~~~~~~~~~~~~~~~ kernel/entry/common.c: In function 'syscall_exit_to_user_mode': kernel/entry/common.c:300:34: error: 'HT_PROTECT_SYSCALL' undeclared (first use in this function) 300 | exit_to_user_mode_prepare(regs, HT_PROTECT_SYSCALL); | ^~~~~~~~~~~~~~~~~~ kernel/entry/common.c: In function 'irqentry_enter_from_user_mode': kernel/entry/common.c:307:29: error: 'HT_PROTECT_IRQ' undeclared (first use in this function) 307 | enter_from_user_mode(regs, HT_PROTECT_IRQ); | ^~~~~~~~~~~~~~ kernel/entry/common.c: In function 'irqentry_exit_to_user_mode': kernel/entry/common.c:313:34: error: 'HT_PROTECT_IRQ' undeclared (first use in this function) 313 | exit_to_user_mode_prepare(regs, HT_PROTECT_IRQ); | ^~~~~~~~~~~~~~ cc1: some warnings being treated as errors -- In file included from kernel/sched/idle.c:9: kernel/sched/sched.h:1287:17: warning: 'struct sched_group' declared inside parameter list will not be visible outside of this definition or declaration 1287 | struct sched_group *group) | ^~~~~~~~~~~ In file included from kernel/sched/idle.c:11: 452 | static inline bool entry_kernel_protected(enum ht_protect_ctx ctx) | ^~~~~~~~~~~~~~ include/linux/entry-common.h:452:63: error: parameter 1 ('ctx') has incomplete type 452 | static inline bool entry_kernel_protected(enum ht_protect_ctx ctx) | ~~~~~~~~~~~~~~~~~~~~^~~ include/linux/entry-common.h:452:20: error: function declaration isn't a prototype [-Werror=strict-prototypes] 452 | static inline bool entry_kernel_protected(enum ht_protect_ctx ctx) | ^~~~~~~~~~~~~~~~~~~~~~ In file included from kernel/sched/sched.h:5, from kernel/sched/idle.c:9: include/linux/entry-common.h: In function 'entry_kernel_protected': include/linux/sched.h:2099:45: error: expected expression before 'do' 2099 | #define sched_core_kernel_protected(ignore) do { } while (0) | ^~ include/linux/entry-common.h:456:9: note: in expansion of macro 'sched_core_kernel_protected' 456 | return sched_core_kernel_protected(ctx) && _TIF_UNSAFE_RET != 0; | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +452 include/linux/entry-common.h 450 451 /* entry_kernel_protected - Is kernel protection on entry/exit into kernel supported? */ 453 { 454 if (!IS_ENABLED(CONFIG_SCHED_CORE)) 455 return false; 456 return sched_core_kernel_protected(ctx) && _TIF_UNSAFE_RET != 0; 457 } 458 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org