* [avpatel:riscv_mpxy_imp_v1 2/5] arch/riscv/include/asm/sbi.h:738:5: warning: no previous prototype for function 'sbi_mpxy_read_attrs'
@ 2026-09-30 9:40 kernel test robot
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From: kernel test robot @ 2026-09-30 9:40 UTC (permalink / raw)
To: Anup Patel; +Cc: llvm, oe-kbuild-all, Himanshu Chauhan
tree: https://github.com/avpatel/linux.git riscv_mpxy_imp_v1
head: ca441e957bb4806b528959ae80efb7e7a9f5447a
commit: 36c74ca9f1dd2278453c544310c73d45beb9c993 [2/5] RISC-V: Move common MPXY helper routines to arch/riscv
config: riscv-nommu_k210_defconfig (https://download.01.org/0day-ci/archive/20260930/202609301701.1eIab1jS-lkp@intel.com/config)
compiler: clang version 24.0.0git (https://github.com/llvm/llvm-project 5f609f950d2e80addf5566623013db68394334db)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260930/202609301701.1eIab1jS-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/202609301701.1eIab1jS-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from arch/riscv/kernel/asm-offsets.c:11:
In file included from include/linux/ftrace.h:10:
In file included from include/linux/trace_recursion.h:5:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:12:
In file included from arch/riscv/include/asm/io.h:148:
include/asm-generic/io.h:1209:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
1209 | return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
| ~~~~~~~~~~ ^
In file included from arch/riscv/kernel/asm-offsets.c:13:
In file included from arch/riscv/include/asm/kvm_host.h:25:
In file included from arch/riscv/include/asm/kvm_vcpu_sbi_fwft.h:12:
>> arch/riscv/include/asm/sbi.h:738:5: warning: no previous prototype for function 'sbi_mpxy_read_attrs' [-Wmissing-prototypes]
738 | int sbi_mpxy_read_attrs(u32 channel_id, u32 base_attrid, u32 attr_count,
| ^
arch/riscv/include/asm/sbi.h:738:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
738 | int sbi_mpxy_read_attrs(u32 channel_id, u32 base_attrid, u32 attr_count,
| ^
| static
>> arch/riscv/include/asm/sbi.h:744:5: warning: no previous prototype for function 'sbi_mpxy_write_attrs' [-Wmissing-prototypes]
744 | int sbi_mpxy_write_attrs(u32 channel_id, u32 base_attrid, u32 attr_count,
| ^
arch/riscv/include/asm/sbi.h:744:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
744 | int sbi_mpxy_write_attrs(u32 channel_id, u32 base_attrid, u32 attr_count,
| ^
| static
>> arch/riscv/include/asm/sbi.h:750:5: warning: no previous prototype for function 'sbi_mpxy_send_message_with_resp' [-Wmissing-prototypes]
750 | int sbi_mpxy_send_message_with_resp(u32 channel_id, u32 msg_id,
| ^
arch/riscv/include/asm/sbi.h:750:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
750 | int sbi_mpxy_send_message_with_resp(u32 channel_id, u32 msg_id,
| ^
| static
>> arch/riscv/include/asm/sbi.h:758:5: warning: no previous prototype for function 'sbi_mpxy_send_message_without_resp' [-Wmissing-prototypes]
758 | int sbi_mpxy_send_message_without_resp(u32 channel_id, u32 msg_id,
| ^
arch/riscv/include/asm/sbi.h:758:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
758 | int sbi_mpxy_send_message_without_resp(u32 channel_id, u32 msg_id,
| ^
| static
>> arch/riscv/include/asm/sbi.h:765:18: warning: declaration of 'struct sbi_mpxy_notification_data' will not be visible outside of this function [-Wvisibility]
765 | struct sbi_mpxy_notification_data *notif_data,
| ^
>> arch/riscv/include/asm/sbi.h:764:5: warning: no previous prototype for function 'sbi_mpxy_get_notifications' [-Wmissing-prototypes]
764 | int sbi_mpxy_get_notifications(u32 channel_id,
| ^
arch/riscv/include/asm/sbi.h:764:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
764 | int sbi_mpxy_get_notifications(u32 channel_id,
| ^
| static
7 warnings generated.
--
In file included from arch/riscv/kernel/alternative.c:18:
>> arch/riscv/include/asm/sbi.h:738:5: warning: no previous prototype for function 'sbi_mpxy_read_attrs' [-Wmissing-prototypes]
738 | int sbi_mpxy_read_attrs(u32 channel_id, u32 base_attrid, u32 attr_count,
| ^
arch/riscv/include/asm/sbi.h:738:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
738 | int sbi_mpxy_read_attrs(u32 channel_id, u32 base_attrid, u32 attr_count,
| ^
| static
>> arch/riscv/include/asm/sbi.h:744:5: warning: no previous prototype for function 'sbi_mpxy_write_attrs' [-Wmissing-prototypes]
744 | int sbi_mpxy_write_attrs(u32 channel_id, u32 base_attrid, u32 attr_count,
| ^
arch/riscv/include/asm/sbi.h:744:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
744 | int sbi_mpxy_write_attrs(u32 channel_id, u32 base_attrid, u32 attr_count,
| ^
| static
>> arch/riscv/include/asm/sbi.h:750:5: warning: no previous prototype for function 'sbi_mpxy_send_message_with_resp' [-Wmissing-prototypes]
750 | int sbi_mpxy_send_message_with_resp(u32 channel_id, u32 msg_id,
| ^
arch/riscv/include/asm/sbi.h:750:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
750 | int sbi_mpxy_send_message_with_resp(u32 channel_id, u32 msg_id,
| ^
| static
>> arch/riscv/include/asm/sbi.h:758:5: warning: no previous prototype for function 'sbi_mpxy_send_message_without_resp' [-Wmissing-prototypes]
758 | int sbi_mpxy_send_message_without_resp(u32 channel_id, u32 msg_id,
| ^
arch/riscv/include/asm/sbi.h:758:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
758 | int sbi_mpxy_send_message_without_resp(u32 channel_id, u32 msg_id,
| ^
| static
>> arch/riscv/include/asm/sbi.h:765:18: warning: declaration of 'struct sbi_mpxy_notification_data' will not be visible outside of this function [-Wvisibility]
765 | struct sbi_mpxy_notification_data *notif_data,
| ^
>> arch/riscv/include/asm/sbi.h:764:5: warning: no previous prototype for function 'sbi_mpxy_get_notifications' [-Wmissing-prototypes]
764 | int sbi_mpxy_get_notifications(u32 channel_id,
| ^
arch/riscv/include/asm/sbi.h:764:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
764 | int sbi_mpxy_get_notifications(u32 channel_id,
| ^
| static
6 warnings generated.
--
In file included from arch/riscv/kernel/kernel_mode_vector.c:16:
In file included from arch/riscv/include/asm/kvm_vcpu_vector.h:17:
In file included from arch/riscv/include/asm/kvm_host.h:25:
In file included from arch/riscv/include/asm/kvm_vcpu_sbi_fwft.h:12:
>> arch/riscv/include/asm/sbi.h:738:5: warning: no previous prototype for function 'sbi_mpxy_read_attrs' [-Wmissing-prototypes]
738 | int sbi_mpxy_read_attrs(u32 channel_id, u32 base_attrid, u32 attr_count,
| ^
arch/riscv/include/asm/sbi.h:738:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
738 | int sbi_mpxy_read_attrs(u32 channel_id, u32 base_attrid, u32 attr_count,
| ^
| static
>> arch/riscv/include/asm/sbi.h:744:5: warning: no previous prototype for function 'sbi_mpxy_write_attrs' [-Wmissing-prototypes]
744 | int sbi_mpxy_write_attrs(u32 channel_id, u32 base_attrid, u32 attr_count,
| ^
arch/riscv/include/asm/sbi.h:744:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
744 | int sbi_mpxy_write_attrs(u32 channel_id, u32 base_attrid, u32 attr_count,
| ^
| static
>> arch/riscv/include/asm/sbi.h:750:5: warning: no previous prototype for function 'sbi_mpxy_send_message_with_resp' [-Wmissing-prototypes]
750 | int sbi_mpxy_send_message_with_resp(u32 channel_id, u32 msg_id,
| ^
arch/riscv/include/asm/sbi.h:750:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
750 | int sbi_mpxy_send_message_with_resp(u32 channel_id, u32 msg_id,
| ^
| static
>> arch/riscv/include/asm/sbi.h:758:5: warning: no previous prototype for function 'sbi_mpxy_send_message_without_resp' [-Wmissing-prototypes]
758 | int sbi_mpxy_send_message_without_resp(u32 channel_id, u32 msg_id,
| ^
arch/riscv/include/asm/sbi.h:758:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
758 | int sbi_mpxy_send_message_without_resp(u32 channel_id, u32 msg_id,
| ^
| static
>> arch/riscv/include/asm/sbi.h:765:18: warning: declaration of 'struct sbi_mpxy_notification_data' will not be visible outside of this function [-Wvisibility]
765 | struct sbi_mpxy_notification_data *notif_data,
| ^
>> arch/riscv/include/asm/sbi.h:764:5: warning: no previous prototype for function 'sbi_mpxy_get_notifications' [-Wmissing-prototypes]
764 | int sbi_mpxy_get_notifications(u32 channel_id,
| ^
arch/riscv/include/asm/sbi.h:764:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
764 | int sbi_mpxy_get_notifications(u32 channel_id,
| ^
| static
In file included from arch/riscv/kernel/kernel_mode_vector.c:16:
In file included from arch/riscv/include/asm/kvm_vcpu_vector.h:17:
In file included from arch/riscv/include/asm/kvm_host.h:27:
In file included from arch/riscv/include/asm/kvm_vcpu_pmu.h:12:
In file included from include/linux/perf/riscv_pmu.h:12:
In file included from include/linux/perf_event.h:43:
In file included from include/linux/ftrace.h:10:
In file included from include/linux/trace_recursion.h:5:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:12:
In file included from arch/riscv/include/asm/io.h:148:
include/asm-generic/io.h:1209:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
1209 | return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
| ~~~~~~~~~~ ^
7 warnings generated.
--
In file included from arch/riscv/kernel/asm-offsets.c:11:
In file included from include/linux/ftrace.h:10:
In file included from include/linux/trace_recursion.h:5:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:12:
In file included from arch/riscv/include/asm/io.h:148:
include/asm-generic/io.h:1209:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
1209 | return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
| ~~~~~~~~~~ ^
In file included from arch/riscv/kernel/asm-offsets.c:13:
In file included from arch/riscv/include/asm/kvm_host.h:25:
In file included from arch/riscv/include/asm/kvm_vcpu_sbi_fwft.h:12:
>> arch/riscv/include/asm/sbi.h:738:5: warning: no previous prototype for function 'sbi_mpxy_read_attrs' [-Wmissing-prototypes]
738 | int sbi_mpxy_read_attrs(u32 channel_id, u32 base_attrid, u32 attr_count,
| ^
arch/riscv/include/asm/sbi.h:738:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
738 | int sbi_mpxy_read_attrs(u32 channel_id, u32 base_attrid, u32 attr_count,
| ^
| static
>> arch/riscv/include/asm/sbi.h:744:5: warning: no previous prototype for function 'sbi_mpxy_write_attrs' [-Wmissing-prototypes]
744 | int sbi_mpxy_write_attrs(u32 channel_id, u32 base_attrid, u32 attr_count,
| ^
arch/riscv/include/asm/sbi.h:744:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
744 | int sbi_mpxy_write_attrs(u32 channel_id, u32 base_attrid, u32 attr_count,
| ^
| static
>> arch/riscv/include/asm/sbi.h:750:5: warning: no previous prototype for function 'sbi_mpxy_send_message_with_resp' [-Wmissing-prototypes]
750 | int sbi_mpxy_send_message_with_resp(u32 channel_id, u32 msg_id,
| ^
arch/riscv/include/asm/sbi.h:750:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
750 | int sbi_mpxy_send_message_with_resp(u32 channel_id, u32 msg_id,
| ^
| static
>> arch/riscv/include/asm/sbi.h:758:5: warning: no previous prototype for function 'sbi_mpxy_send_message_without_resp' [-Wmissing-prototypes]
758 | int sbi_mpxy_send_message_without_resp(u32 channel_id, u32 msg_id,
| ^
arch/riscv/include/asm/sbi.h:758:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
758 | int sbi_mpxy_send_message_without_resp(u32 channel_id, u32 msg_id,
| ^
| static
>> arch/riscv/include/asm/sbi.h:765:18: warning: declaration of 'struct sbi_mpxy_notification_data' will not be visible outside of this function [-Wvisibility]
765 | struct sbi_mpxy_notification_data *notif_data,
| ^
>> arch/riscv/include/asm/sbi.h:764:5: warning: no previous prototype for function 'sbi_mpxy_get_notifications' [-Wmissing-prototypes]
764 | int sbi_mpxy_get_notifications(u32 channel_id,
| ^
arch/riscv/include/asm/sbi.h:764:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
764 | int sbi_mpxy_get_notifications(u32 channel_id,
| ^
| static
7 warnings generated.
In file included from kernel/sched/rq-offsets.c:5:
In file included from kernel/sched/sched.h:28:
In file included from include/linux/cgroup_api.h:1:
In file included from include/linux/cgroup.h:27:
In file included from include/linux/kernel_stat.h:8:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:12:
In file included from arch/riscv/include/asm/io.h:148:
include/asm-generic/io.h:1209:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
1209 | return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
| ~~~~~~~~~~ ^
1 warning generated.
vim +/sbi_mpxy_read_attrs +738 arch/riscv/include/asm/sbi.h
737
> 738 int sbi_mpxy_read_attrs(u32 channel_id, u32 base_attrid, u32 attr_count,
739 u32 *attrs_buf)
740 {
741 return -ENODEV;
742 }
743
> 744 int sbi_mpxy_write_attrs(u32 channel_id, u32 base_attrid, u32 attr_count,
745 u32 *attrs_buf)
746 {
747 return -ENODEV;
748 }
749
> 750 int sbi_mpxy_send_message_with_resp(u32 channel_id, u32 msg_id,
751 void *tx, unsigned long tx_len,
752 void *rx, unsigned long max_rx_len,
753 unsigned long *rx_len)
754 {
755 return -ENODEV;
756 }
757
> 758 int sbi_mpxy_send_message_without_resp(u32 channel_id, u32 msg_id,
759 void *tx, unsigned long tx_len)
760 {
761 return -ENODEV;
762 }
763
> 764 int sbi_mpxy_get_notifications(u32 channel_id,
> 765 struct sbi_mpxy_notification_data *notif_data,
766 unsigned long *events_data_len)
767 {
768 return -ENODEV;
769 }
770
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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2026-09-30 9:40 [avpatel:riscv_mpxy_imp_v1 2/5] arch/riscv/include/asm/sbi.h:738:5: warning: no previous prototype for function 'sbi_mpxy_read_attrs' kernel test robot
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