* [broonie-misc:for-kernelci 6/13] include/linux/pgtable.h:237:2: error: call to undeclared function 'arch_enter_lazy_mmu_mode'; ISO C99 and later do not support implicit function declarations
@ 2025-10-15 0:58 kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2025-10-15 0:58 UTC (permalink / raw)
To: Kevin Brodsky; +Cc: llvm, oe-kbuild-all
Hi Kevin,
FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/broonie/misc.git for-kernelci
head: cde5afc166019bb0b077b88d78b3706ede96628a
commit: 3763e0f7bacf2669411cf2e580ca62e64eafb813 [6/13] mm: introduce generic lazy_mmu helpers
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20251015/202510150845.bOLBMSFb-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251015/202510150845.bOLBMSFb-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/202510150845.bOLBMSFb-lkp@intel.com/
All errors (new ones prefixed by >>):
In file included from arch/x86/boot/startup/sme.c:38:
In file included from include/linux/mm.h:31:
>> include/linux/pgtable.h:237:2: error: call to undeclared function 'arch_enter_lazy_mmu_mode'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
237 | arch_enter_lazy_mmu_mode();
| ^
>> include/linux/pgtable.h:242:2: error: call to undeclared function 'arch_leave_lazy_mmu_mode'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
242 | arch_leave_lazy_mmu_mode();
| ^
include/linux/pgtable.h:247:2: error: call to undeclared function 'arch_leave_lazy_mmu_mode'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
247 | arch_leave_lazy_mmu_mode();
| ^
include/linux/pgtable.h:252:2: error: call to undeclared function 'arch_enter_lazy_mmu_mode'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
252 | arch_enter_lazy_mmu_mode();
| ^
In file included from arch/x86/boot/startup/sme.c:38:
In file included from include/linux/mm.h:36:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:98:11: warning: array index 3 is past the end of the array (that has type 'unsigned long[1]') [-Warray-bounds]
98 | return (set->sig[3] | set->sig[2] |
| ^ ~
arch/x86/include/asm/signal.h:24:2: note: array 'sig' declared here
24 | unsigned long sig[_NSIG_WORDS];
| ^
In file included from arch/x86/boot/startup/sme.c:38:
In file included from include/linux/mm.h:36:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:98:25: warning: array index 2 is past the end of the array (that has type 'unsigned long[1]') [-Warray-bounds]
98 | return (set->sig[3] | set->sig[2] |
| ^ ~
arch/x86/include/asm/signal.h:24:2: note: array 'sig' declared here
24 | unsigned long sig[_NSIG_WORDS];
| ^
In file included from arch/x86/boot/startup/sme.c:38:
In file included from include/linux/mm.h:36:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:99:4: warning: array index 1 is past the end of the array (that has type 'unsigned long[1]') [-Warray-bounds]
99 | set->sig[1] | set->sig[0]) == 0;
| ^ ~
arch/x86/include/asm/signal.h:24:2: note: array 'sig' declared here
24 | unsigned long sig[_NSIG_WORDS];
| ^
In file included from arch/x86/boot/startup/sme.c:38:
In file included from include/linux/mm.h:36:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:101:11: warning: array index 1 is past the end of the array (that has type 'unsigned long[1]') [-Warray-bounds]
101 | return (set->sig[1] | set->sig[0]) == 0;
| ^ ~
arch/x86/include/asm/signal.h:24:2: note: array 'sig' declared here
24 | unsigned long sig[_NSIG_WORDS];
| ^
In file included from arch/x86/boot/startup/sme.c:38:
In file included from include/linux/mm.h:36:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:114:11: warning: array index 3 is past the end of the array (that has type 'const unsigned long[1]') [-Warray-bounds]
114 | return (set1->sig[3] == set2->sig[3]) &&
| ^ ~
arch/x86/include/asm/signal.h:24:2: note: array 'sig' declared here
24 | unsigned long sig[_NSIG_WORDS];
| ^
In file included from arch/x86/boot/startup/sme.c:38:
In file included from include/linux/mm.h:36:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:114:27: warning: array index 3 is past the end of the array (that has type 'const unsigned long[1]') [-Warray-bounds]
114 | return (set1->sig[3] == set2->sig[3]) &&
| ^ ~
arch/x86/include/asm/signal.h:24:2: note: array 'sig' declared here
24 | unsigned long sig[_NSIG_WORDS];
| ^
In file included from arch/x86/boot/startup/sme.c:38:
In file included from include/linux/mm.h:36:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:115:5: warning: array index 2 is past the end of the array (that has type 'const unsigned long[1]') [-Warray-bounds]
115 | (set1->sig[2] == set2->sig[2]) &&
| ^ ~
arch/x86/include/asm/signal.h:24:2: note: array 'sig' declared here
24 | unsigned long sig[_NSIG_WORDS];
| ^
In file included from arch/x86/boot/startup/sme.c:38:
In file included from include/linux/mm.h:36:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:115:21: warning: array index 2 is past the end of the array (that has type 'const unsigned long[1]') [-Warray-bounds]
115 | (set1->sig[2] == set2->sig[2]) &&
| ^ ~
arch/x86/include/asm/signal.h:24:2: note: array 'sig' declared here
24 | unsigned long sig[_NSIG_WORDS];
| ^
In file included from arch/x86/boot/startup/sme.c:38:
In file included from include/linux/mm.h:36:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:116:5: warning: array index 1 is past the end of the array (that has type 'const unsigned long[1]') [-Warray-bounds]
116 | (set1->sig[1] == set2->sig[1]) &&
| ^ ~
arch/x86/include/asm/signal.h:24:2: note: array 'sig' declared here
24 | unsigned long sig[_NSIG_WORDS];
| ^
In file included from arch/x86/boot/startup/sme.c:38:
In file included from include/linux/mm.h:36:
vim +/arch_enter_lazy_mmu_mode +237 include/linux/pgtable.h
214
215 /*
216 * A facility to provide lazy MMU batching. This allows PTE updates and
217 * page invalidations to be delayed until a call to leave lazy MMU mode
218 * is issued. Some architectures may benefit from doing this, and it is
219 * beneficial for both shadow and direct mode hypervisors, which may batch
220 * the PTE updates which happen during this window. Note that using this
221 * interface requires that read hazards be removed from the code. A read
222 * hazard could result in the direct mode hypervisor case, since the actual
223 * write to the page tables may not yet have taken place, so reads though
224 * a raw PTE pointer after it has been modified are not guaranteed to be
225 * up to date.
226 *
227 * In the general case, no lock is guaranteed to be held between entry and exit
228 * of the lazy mode. So the implementation must assume preemption may be enabled
229 * and cpu migration is possible; it must take steps to be robust against this.
230 * (In practice, for user PTE updates, the appropriate page table lock(s) are
231 * held, but for kernel PTE updates, no lock is held). Nesting is not permitted
232 * and the mode cannot be used in interrupt context.
233 */
234 #ifdef CONFIG_ARCH_LAZY_MMU
235 static inline void lazy_mmu_mode_enable(void)
236 {
> 237 arch_enter_lazy_mmu_mode();
238 }
239
240 static inline void lazy_mmu_mode_disable(void)
241 {
> 242 arch_leave_lazy_mmu_mode();
243 }
244
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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