Re: [PATCH v2] Makefile.extrawarn: enable -Wmissing-variable-declarations for W=1

From: kernel test robot
Date: Mon Aug 07 2023 - 22:45:49 EST

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In reply to: kernel test robot: "Re: [PATCH v2] Makefile.extrawarn: enable -Wmissing-variable-declarations for W=1"
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Hi Nick,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 52a93d39b17dc7eb98b6aa3edb93943248e03b2f]

url: https://github.com/intel-lab-lkp/linux/commits/Nick-Desaulniers/Makefile-extrawarn-enable-Wmissing-variable-declarations-for-W-1/20230808-005859
base: 52a93d39b17dc7eb98b6aa3edb93943248e03b2f
patch link: https://lore.kernel.org/r/20230807-missing_proto-v2-1-3ae2e188bb0c%40google.com
patch subject: [PATCH v2] Makefile.extrawarn: enable -Wmissing-variable-declarations for W=1
config: um-randconfig-r031-20230807 (https://download.01.org/0day-ci/archive/20230808/202308081050.sZEw4cQ5-lkp@xxxxxxxxx/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project.git f28c006a5895fc0e329fe15fead81e37457cb1d1)
reproduce: (https://download.01.org/0day-ci/archive/20230808/202308081050.sZEw4cQ5-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202308081050.sZEw4cQ5-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

In file included from scripts/mod/devicetable-offsets.c:3:
In file included from include/linux/mod_devicetable.h:14:
In file included from include/linux/uuid.h:11:
In file included from include/linux/string.h:20:
In file included from arch/x86/include/asm/string.h:5:
In file included from arch/x86/include/asm/string_64.h:6:
In file included from include/linux/jump_label.h:255:
In file included from include/linux/atomic.h:7:
In file included from arch/x86/include/asm/atomic.h:7:
In file included from arch/x86/include/asm/alternative.h:7:
>> arch/x86/include/asm/asm.h:208:24: warning: no previous extern declaration for non-static variable 'current_stack_pointer' [-Wmissing-variable-declarations]
register unsigned long current_stack_pointer asm(_ASM_SP);
^
arch/x86/include/asm/asm.h:208:10: note: declare 'static' if the variable is not intended to be used outside of this translation unit
register unsigned long current_stack_pointer asm(_ASM_SP);
^
1 warning generated.
--
In file included from arch/um/kernel/asm-offsets.c:1:
arch/x86/um/shared/sysdep/kernel-offsets.h:9:6: warning: no previous prototype for function 'foo' [-Wmissing-prototypes]
void foo(void)
^
arch/x86/um/shared/sysdep/kernel-offsets.h:9:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void foo(void)
^
static
In file included from arch/um/kernel/asm-offsets.c:1:
In file included from arch/x86/um/shared/sysdep/kernel-offsets.h:3:
In file included from include/linux/sched.h:12:
In file included from ./arch/um/include/generated/asm/current.h:1:
In file included from include/asm-generic/current.h:5:
In file included from include/linux/thread_info.h:27:
In file included from include/linux/bitops.h:34:
In file included from include/asm-generic/bitops/generic-non-atomic.h:7:
In file included from arch/x86/um/asm/barrier.h:6:
In file included from arch/x86/include/asm/alternative.h:7:
>> arch/x86/include/asm/asm.h:208:24: warning: no previous extern declaration for non-static variable 'current_stack_pointer' [-Wmissing-variable-declarations]
register unsigned long current_stack_pointer asm(_ASM_SP);
^
arch/x86/include/asm/asm.h:208:10: note: declare 'static' if the variable is not intended to be used outside of this translation unit
register unsigned long current_stack_pointer asm(_ASM_SP);
^
2 warnings generated.
--
In file included from arch/um/drivers/hostaudio_kern.c:6:
In file included from include/linux/fs.h:6:
In file included from include/linux/wait_bit.h:8:
In file included from include/linux/wait.h:7:
In file included from include/linux/list.h:11:
In file included from arch/x86/um/asm/barrier.h:6:
In file included from arch/x86/include/asm/alternative.h:7:
>> arch/x86/include/asm/asm.h:208:24: warning: no previous extern declaration for non-static variable 'current_stack_pointer' [-Wmissing-variable-declarations]
register unsigned long current_stack_pointer asm(_ASM_SP);
^
arch/x86/include/asm/asm.h:208:10: note: declare 'static' if the variable is not intended to be used outside of this translation unit
register unsigned long current_stack_pointer asm(_ASM_SP);
^
>> arch/um/drivers/hostaudio_kern.c:316:3: warning: no previous extern declaration for non-static variable 'module_data' [-Wmissing-variable-declarations]
} module_data;
^
arch/um/drivers/hostaudio_kern.c:313:1: note: declare 'static' if the variable is not intended to be used outside of this translation unit
struct {
^
2 warnings generated.
--
In file included from arch/um/drivers/daemon_kern.c:10:
In file included from include/linux/netdevice.h:38:
In file included from include/net/net_namespace.h:43:
In file included from include/linux/skbuff.h:17:
In file included from include/linux/bvec.h:10:
In file included from include/linux/highmem.h:12:
In file included from include/linux/hardirq.h:11:
In file included from arch/um/include/asm/hardirq.h:5:
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:13:
In file included from arch/um/include/asm/io.h:24:
include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __raw_readb(PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
#define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
^
In file included from arch/um/drivers/daemon_kern.c:10:
In file included from include/linux/netdevice.h:38:
In file included from include/net/net_namespace.h:43:
In file included from include/linux/skbuff.h:17:
In file included from include/linux/bvec.h:10:
In file included from include/linux/highmem.h:12:
In file included from include/linux/hardirq.h:11:
In file included from arch/um/include/asm/hardirq.h:5:
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:13:
In file included from arch/um/include/asm/io.h:24:
include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
#define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
^
In file included from arch/um/drivers/daemon_kern.c:10:
In file included from include/linux/netdevice.h:38:
In file included from include/net/net_namespace.h:43:
In file included from include/linux/skbuff.h:17:
In file included from include/linux/bvec.h:10:
In file included from include/linux/highmem.h:12:
In file included from include/linux/hardirq.h:11:
In file included from arch/um/include/asm/hardirq.h:5:
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:13:
In file included from arch/um/include/asm/io.h:24:
include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writeb(value, PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:692:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:700:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:708:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:717:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:726:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:735:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
In file included from arch/um/drivers/daemon_kern.c:10:
In file included from include/linux/netdevice.h:24:
In file included from include/linux/timer.h:5:
In file included from include/linux/list.h:11:
In file included from arch/x86/um/asm/barrier.h:6:
In file included from arch/x86/include/asm/alternative.h:7:
>> arch/x86/include/asm/asm.h:208:24: warning: no previous extern declaration for non-static variable 'current_stack_pointer' [-Wmissing-variable-declarations]
register unsigned long current_stack_pointer asm(_ASM_SP);
^
arch/x86/include/asm/asm.h:208:10: note: declare 'static' if the variable is not intended to be used outside of this translation unit
register unsigned long current_stack_pointer asm(_ASM_SP);
^
13 warnings generated.
--
In file included from arch/um/drivers/port_kern.c:7:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from arch/um/include/asm/hardirq.h:5:
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:13:
In file included from arch/um/include/asm/io.h:24:
include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __raw_readb(PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
#define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
^
In file included from arch/um/drivers/port_kern.c:7:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from arch/um/include/asm/hardirq.h:5:
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:13:
In file included from arch/um/include/asm/io.h:24:
include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
#define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
^
In file included from arch/um/drivers/port_kern.c:7:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from arch/um/include/asm/hardirq.h:5:
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:13:
In file included from arch/um/include/asm/io.h:24:
include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writeb(value, PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:692:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:700:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:708:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:717:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:726:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:735:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
>> arch/um/drivers/port_kern.c:147:14: warning: no previous extern declaration for non-static variable 'port_work' [-Wmissing-variable-declarations]
DECLARE_WORK(port_work, port_work_proc);
^
arch/um/drivers/port_kern.c:147:1: note: declare 'static' if the variable is not intended to be used outside of this translation unit
DECLARE_WORK(port_work, port_work_proc);
^
include/linux/workqueue.h:194:2: note: expanded from macro 'DECLARE_WORK'
struct work_struct n = __WORK_INITIALIZER(n, f)
^
In file included from arch/um/drivers/port_kern.c:6:
In file included from include/linux/completion.h:12:
In file included from include/linux/swait.h:5:
In file included from include/linux/list.h:11:
In file included from arch/x86/um/asm/barrier.h:6:
In file included from arch/x86/include/asm/alternative.h:7:
>> arch/x86/include/asm/asm.h:208:24: warning: no previous extern declaration for non-static variable 'current_stack_pointer' [-Wmissing-variable-declarations]
register unsigned long current_stack_pointer asm(_ASM_SP);
^
arch/x86/include/asm/asm.h:208:10: note: declare 'static' if the variable is not intended to be used outside of this translation unit
register unsigned long current_stack_pointer asm(_ASM_SP);
^
14 warnings generated.
--
In file included from arch/um/drivers/xterm_kern.c:10:
In file included from arch/um/include/shared/irq_kern.h:9:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from arch/um/include/asm/hardirq.h:5:
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:13:
In file included from arch/um/include/asm/io.h:24:
include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __raw_readb(PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
#define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
^
In file included from arch/um/drivers/xterm_kern.c:10:
In file included from arch/um/include/shared/irq_kern.h:9:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from arch/um/include/asm/hardirq.h:5:
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:13:
In file included from arch/um/include/asm/io.h:24:
include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
#define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
^
In file included from arch/um/drivers/xterm_kern.c:10:
In file included from arch/um/include/shared/irq_kern.h:9:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from arch/um/include/asm/hardirq.h:5:
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:13:
In file included from arch/um/include/asm/io.h:24:
include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writeb(value, PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:692:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:700:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:708:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:717:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:726:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:735:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
arch/um/drivers/xterm_kern.c:35:5: warning: no previous prototype for function 'xterm_fd' [-Wmissing-prototypes]
int xterm_fd(int socket, int *pid_out)
^
arch/um/drivers/xterm_kern.c:35:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int xterm_fd(int socket, int *pid_out)
^
static
In file included from arch/um/drivers/xterm_kern.c:6:
In file included from include/linux/slab.h:16:
In file included from include/linux/gfp.h:7:
In file included from include/linux/mmzone.h:8:
In file included from include/linux/spinlock.h:56:
In file included from include/linux/preempt.h:12:
In file included from include/linux/list.h:11:
In file included from arch/x86/um/asm/barrier.h:6:
In file included from arch/x86/include/asm/alternative.h:7:
>> arch/x86/include/asm/asm.h:208:24: warning: no previous extern declaration for non-static variable 'current_stack_pointer' [-Wmissing-variable-declarations]
register unsigned long current_stack_pointer asm(_ASM_SP);
^
arch/x86/include/asm/asm.h:208:10: note: declare 'static' if the variable is not intended to be used outside of this translation unit
register unsigned long current_stack_pointer asm(_ASM_SP);
^
14 warnings generated.
..

vim +/current_stack_pointer +208 arch/x86/include/asm/asm.h

a34746bc43eb63 include/asm-x86/asm.h H. Peter Anvin 2008-02-04 201
f5caf621ee3572 arch/x86/include/asm/asm.h Josh Poimboeuf 2017-09-20 202 /*
f5caf621ee3572 arch/x86/include/asm/asm.h Josh Poimboeuf 2017-09-20 203 * This output constraint should be used for any inline asm which has a "call"
f5caf621ee3572 arch/x86/include/asm/asm.h Josh Poimboeuf 2017-09-20 204 * instruction. Otherwise the asm may be inserted before the frame pointer
f5caf621ee3572 arch/x86/include/asm/asm.h Josh Poimboeuf 2017-09-20 205 * gets set up by the containing function. If you forget to do this, objtool
f5caf621ee3572 arch/x86/include/asm/asm.h Josh Poimboeuf 2017-09-20 206 * may print a "call without frame pointer save/setup" warning.
f5caf621ee3572 arch/x86/include/asm/asm.h Josh Poimboeuf 2017-09-20 207 */
196bd485ee4f03 arch/x86/include/asm/asm.h Andrey Ryabinin 2017-09-29 @208 register unsigned long current_stack_pointer asm(_ASM_SP);
196bd485ee4f03 arch/x86/include/asm/asm.h Andrey Ryabinin 2017-09-29 209 #define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer)
28b60197b573cd arch/x86/include/asm/asm.h Borislav Petkov 2020-06-04 210 #endif /* __ASSEMBLY__ */
f5caf621ee3572 arch/x86/include/asm/asm.h Josh Poimboeuf 2017-09-20 211

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