[kbuild-all] [linux-stable-rc:linux-4.4.y 9981/9999] include/asm-generic/bug.h:159:2: error: implicit declaration of function 'no_printk'; did you mean 'printk'?

Sunday, 22 August 2021

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
linux-4.4.y
head:   bb07acdd9271518022b632253e857f43c09fb147
commit: b60b53d4980f879884740e672d83155980d74445 [9981/9999] printk: help pr_debug and
pr_devel to optimize out arguments
config: powerpc64-buildonly-randconfig-r006-20210822 (attached as .config)
compiler: powerpc-linux-gcc (GCC) 7.5.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O
~/bin/make.cross
        chmod +x ~/bin/make.cross
        #
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.gi...
        git remote add linux-stable-rc
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
        git fetch --no-tags linux-stable-rc linux-4.4.y
        git checkout b60b53d4980f879884740e672d83155980d74445
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-7.5.0 make.cross ARCH=powerpc 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp(a)intel.com&gt;

All errors (new ones prefixed by >>):

   In file included from lib/842/842_decompress.c:23:0:
   lib/842/842_debugfs.h: In function 'sw842_debugfs_create':
   lib/842/842_debugfs.h:27:16: warning: comparison between signed and unsigned integer
expressions [-Wsign-compare]
     for (i = 0; i < ARRAY_SIZE(template_count); i++) {
                   ^
   lib/842/842_decompress.c: In function 'next_bits':
   lib/842/842_decompress.c:115:28: warning: comparison between signed and unsigned
integer expressions [-Wsign-compare]
     if (DIV_ROUND_UP(bits, 8) > p->ilen)
                               ^
   In file included from arch/powerpc/include/asm/bug.h:127:0,
                    from include/linux/bug.h:4,
                    from include/linux/thread_info.h:11,
                    from include/asm-generic/preempt.h:4,
                    from arch/powerpc/include/generated/asm/preempt.h:1,
                    from include/linux/preempt.h:59,
                    from include/linux/spinlock.h:50,
                    from include/linux/seqlock.h:35,
                    from include/linux/time.h:5,
                    from include/linux/stat.h:18,
                    from include/linux/module.h:10,
                    from lib/842/842.h:76,
                    from lib/842/842_decompress.c:22:
   lib/842/842_decompress.c: In function '__do_index':
...
> include/asm-generic/bug.h:159:2: error: implicit declaration of
function 'no_printk'; did you mean 'printk'?
[-Werror=implicit-function-declaration]      no_printk(format);      \
     ^
   lib/842/842_decompress.c:72:3: note: in expansion of macro 'WARN'
      WARN(1, "pr_debug param err invalid size %x\n", s))
      ^~~~
   include/linux/printk.h:114:17: note: in expansion of macro 'beN_to_cpu'
      printk(fmt, ##__VA_ARGS__); \
                    ^~~~~~~~~~~
   include/linux/printk.h:289:2: note: in expansion of macro 'no_printk'
     no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
     ^~~~~~~~~
   lib/842/842_decompress.c:205:2: note: in expansion of macro 'pr_debug'
     pr_debug("index%x to %lx off %lx adjoff %lx tot %lx data %lx\n",
     ^~~~~~~~
   lib/842/842_decompress.c:71:54: warning: signed and unsigned type in conditional
expression [-Wsign-compare]
      (s) == 8 ? be64_to_cpu(get_unaligned((__be64 *)d)) : \
                                                         ^
   include/linux/printk.h:114:17: note: in expansion of macro 'beN_to_cpu'
      printk(fmt, ##__VA_ARGS__); \
                    ^~~~~~~~~~~
   include/linux/printk.h:289:2: note: in expansion of macro 'no_printk'
     no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
     ^~~~~~~~~
   lib/842/842_decompress.c:205:2: note: in expansion of macro 'pr_debug'
     pr_debug("index%x to %lx off %lx adjoff %lx tot %lx data %lx\n",
     ^~~~~~~~
   cc1: some warnings being treated as errors
--
   In file included from include/linux/ring_buffer.h:5:0,
                    from include/linux/trace_events.h:5,
                    from include/trace/syscall.h:6,
                    from include/linux/syscalls.h:81,
                    from arch/powerpc/kernel/syscalls.c:24:
   include/linux/mm.h: In function 'is_vmalloc_addr':
   include/linux/mm.h:386:14: error: comparison between signed and unsigned integer
expressions [-Werror=sign-compare]
     return addr >= VMALLOC_START && addr < VMALLOC_END;
                 ^~
   arch/powerpc/kernel/syscalls.c: At top level:
...
> arch/powerpc/kernel/syscalls.c:86:1: error: no previous
declaration for 'ppc_select' [-Werror=missing-declarations]    
ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct
timeval __user *tvp)
    ^~~~~~~~~~
...
> arch/powerpc/kernel/syscalls.c:118:6: error: no previous
declaration for 'ppc_fadvise64_64' [-Werror=missing-declarations]     long
ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low,
         ^~~~~~~~~~~~~~~~
   arch/powerpc/kernel/syscalls.c:125:6: error: no previous declaration for
'sys_switch_endian' [-Werror=missing-declarations]
    long sys_switch_endian(void)
         ^~~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors
--
   In file included from include/linux/pid_namespace.h:6:0,
                    from include/linux/ptrace.h:8,
                    from arch/powerpc/kernel/irq.c:38:
   include/linux/mm.h: In function 'is_vmalloc_addr':
   include/linux/mm.h:386:14: error: comparison between signed and unsigned integer
expressions [-Werror=sign-compare]
     return addr >= VMALLOC_START && addr < VMALLOC_END;
                 ^~
   In file included from arch/powerpc/include/asm/bug.h:127:0,
                    from include/linux/bug.h:4,
                    from include/linux/cpumask.h:12,
                    from include/linux/smp.h:12,
                    from include/linux/kernel_stat.h:4,
                    from arch/powerpc/kernel/irq.c:35:
   include/linux/scatterlist.h: In function 'sg_set_buf':
...
> arch/powerpc/include/asm/page.h:129:32: error: comparison of
unsigned expression >= 0 is always true [-Werror=type-limits]     #define
pfn_valid(pfn)  ((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr)
                                   ^
   include/asm-generic/bug.h:146:36: note: in definition of macro 'BUG_ON'
    #define BUG_ON(condition) do { if (condition) BUG(); } while (0)
                                       ^~~~~~~~~
   arch/powerpc/include/asm/page.h:146:32: note: in expansion of macro
'pfn_valid'
    #define virt_addr_valid(kaddr) pfn_valid(virt_to_pfn(kaddr))
                                   ^~~~~~~~~
   include/linux/scatterlist.h:140:10: note: in expansion of macro
'virt_addr_valid'
     BUG_ON(!virt_addr_valid(buf));
             ^~~~~~~~~~~~~~~
   In file included from include/linux/interrupt.h:11:0,
                    from include/linux/kernel_stat.h:8,
                    from arch/powerpc/kernel/irq.c:35:
   arch/powerpc/kernel/irq.c: In function 'migrate_irqs':
   include/linux/irqnr.h:12:45: error: comparison between signed and unsigned integer
expressions [-Werror=sign-compare]
     for (irq = 0, desc = irq_to_desc(irq); irq < nr_irqs;  \
                                                ^
   arch/powerpc/kernel/irq.c:434:2: note: in expansion of macro
'for_each_irq_desc'
     for_each_irq_desc(irq, desc) {
     ^~~~~~~~~~~~~~~~~
   arch/powerpc/kernel/irq.c:445:25: error: comparison between signed and unsigned integer
expressions [-Werror=sign-compare]
      if (cpumask_any(mask) >= nr_cpu_ids) {
                            ^~
   arch/powerpc/kernel/irq.c: At top level:
...
> arch/powerpc/kernel/irq.c:547:13: error: no previous declaration
for 'init_IRQ' [-Werror=missing-declarations]     void __init
init_IRQ(void)
                ^~~~~~~~
   cc1: all warnings being treated as errors
--
   In file included from arch/powerpc/kernel/signal_32.c:21:0:
   include/linux/mm.h: In function 'is_vmalloc_addr':
   include/linux/mm.h:386:14: error: comparison between signed and unsigned integer
expressions [-Werror=sign-compare]
     return addr >= VMALLOC_START && addr < VMALLOC_END;
                 ^~
   In file included from include/asm-generic/termios-base.h:7:0,
                    from arch/powerpc/include/asm/termios.h:20,
                    from include/uapi/linux/termios.h:5,
                    from include/linux/tty.h:6,
                    from arch/powerpc/kernel/signal_32.c:36:
   include/asm-generic/termios-base.h: In function
'user_termio_to_kernel_termios':
   arch/powerpc/include/asm/uaccess.h:57:35: error: comparison of unsigned expression
>= 0 is always true [-Werror=type-limits]
      (((size) == 0) || (((size) - 1) <= ((segment).seg - (addr)))))
                                      ^
   arch/powerpc/include/asm/uaccess.h:63:3: note: in expansion of macro
'__access_ok'
      __access_ok((__force unsigned long)(addr), (size), get_fs()))
      ^~~~~~~~~~~
   arch/powerpc/include/asm/uaccess.h:300:6: note: in expansion of macro
'access_ok'
     if (access_ok(VERIFY_READ, __gu_addr, (size))) {  \
         ^~~~~~~~~
   arch/powerpc/include/asm/uaccess.h:103:2: note: in expansion of macro
'__get_user_check'
     __get_user_check((x), (ptr), sizeof(*(ptr)))
     ^~~~~~~~~~~~~~~~
   include/asm-generic/termios-base.h:35:6: note: in expansion of macro
'get_user'
     if (get_user(termios->c_line, &termio->c_line) < 0)
         ^~~~~~~~
   include/asm-generic/termios-base.h: In function
'kernel_termios_to_user_termio':
   arch/powerpc/include/asm/uaccess.h:57:35: error: comparison of unsigned expression
>= 0 is always true [-Werror=type-limits]
      (((size) == 0) || (((size) - 1) <= ((segment).seg - (addr)))))
                                      ^
   arch/powerpc/include/asm/uaccess.h:63:3: note: in expansion of macro
'__access_ok'
      __access_ok((__force unsigned long)(addr), (size), get_fs()))
      ^~~~~~~~~~~
   arch/powerpc/include/asm/uaccess.h:192:6: note: in expansion of macro
'access_ok'
     if (access_ok(VERIFY_WRITE, __pu_addr, size))   \
         ^~~~~~~~~
   arch/powerpc/include/asm/uaccess.h:105:2: note: in expansion of macro
'__put_user_check'
     __put_user_check((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
     ^~~~~~~~~~~~~~~~
   include/asm-generic/termios-base.h:57:6: note: in expansion of macro
'put_user'
         put_user(termios->c_line,  &termio->c_line) < 0 ||
         ^~~~~~~~
   arch/powerpc/kernel/signal_32.c: At top level:
   arch/powerpc/kernel/signal_32.c:1139:6: error: no previous declaration for
'sys_swapcontext' [-Werror=missing-declarations]
    long sys_swapcontext(struct ucontext __user *old_ctx,
         ^~~~~~~~~~~~~~~
   arch/powerpc/kernel/signal_32.c: In function 'sys_swapcontext':
   arch/powerpc/kernel/signal_32.c:1184:15: error: comparison between signed and unsigned
integer expressions [-Werror=sign-compare]
     if (ctx_size < sizeof(struct ucontext))
                  ^
   In file included from include/asm-generic/termios-base.h:7:0,
                    from arch/powerpc/include/asm/termios.h:20,
                    from include/uapi/linux/termios.h:5,
                    from include/linux/tty.h:6,
                    from arch/powerpc/kernel/signal_32.c:36:
   arch/powerpc/include/asm/uaccess.h:57:35: error: comparison between signed and unsigned
integer expressions [-Werror=sign-compare]
      (((size) == 0) || (((size) - 1) <= ((segment).seg - (addr)))))
                                      ^
   arch/powerpc/include/asm/uaccess.h:63:3: note: in expansion of macro
'__access_ok'
      __access_ok((__force unsigned long)(addr), (size), get_fs()))
      ^~~~~~~~~~~
   arch/powerpc/kernel/signal_32.c:1199:8: note: in expansion of macro
'access_ok'
      if (!access_ok(VERIFY_WRITE, old_ctx, ctx_size)
           ^~~~~~~~~
   arch/powerpc/include/asm/uaccess.h:57:35: error: comparison between signed and unsigned
integer expressions [-Werror=sign-compare]
      (((size) == 0) || (((size) - 1) <= ((segment).seg - (addr)))))
                                      ^
   arch/powerpc/include/asm/uaccess.h:63:3: note: in expansion of macro
'__access_ok'
      __access_ok((__force unsigned long)(addr), (size), get_fs()))
      ^~~~~~~~~~~
   arch/powerpc/kernel/signal_32.c:1207:7: note: in expansion of macro
'access_ok'
     if (!access_ok(VERIFY_READ, new_ctx, ctx_size)
          ^~~~~~~~~
...
> arch/powerpc/kernel/signal_32.c:1143:16: error: variable
'tmp' set but not used [-Werror=unused-but-set-variable]      unsigned char
tmp;
                   ^~~
   arch/powerpc/kernel/signal_32.c: At top level:
...
> arch/powerpc/kernel/signal_32.c:1230:6: error: no previous
declaration for 'sys_rt_sigreturn' [-Werror=missing-declarations]     long
sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
         ^~~~~~~~~~~~~~~~
...
> arch/powerpc/kernel/signal_32.c:1311:5: error: no previous
declaration for 'sys_debug_setcontext' [-Werror=missing-declarations]    
int sys_debug_setcontext(struct ucontext __user *ctx,
        ^~~~~~~~~~~~~~~~~~~~
   arch/powerpc/kernel/signal_32.c: In function 'sys_debug_setcontext':
   arch/powerpc/kernel/signal_32.c:1318:16: error: variable 'tmp' set but not used
[-Werror=unused-but-set-variable]
     unsigned char tmp;
                   ^~~
   arch/powerpc/kernel/signal_32.c: At top level:
...
> arch/powerpc/kernel/signal_32.c:1502:6: error: no previous
declaration for 'sys_sigreturn' [-Werror=missing-declarations]     long
sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
         ^~~~~~~~~~~~~
   cc1: all warnings being treated as errors
--
   In file included from arch/powerpc/kernel/vdso.c:15:0:
   include/linux/mm.h: In function 'is_vmalloc_addr':
   include/linux/mm.h:386:14: error: comparison between signed and unsigned integer
expressions [-Werror=sign-compare]
     return addr >= VMALLOC_START && addr < VMALLOC_END;
                 ^~
   In file included from arch/powerpc/include/asm/bug.h:127:0,
                    from include/linux/bug.h:4,
                    from include/linux/thread_info.h:11,
                    from include/asm-generic/preempt.h:4,
                    from arch/powerpc/include/generated/asm/preempt.h:1,
                    from include/linux/preempt.h:59,
                    from include/linux/spinlock.h:50,
                    from include/linux/seqlock.h:35,
                    from include/linux/time.h:5,
                    from include/uapi/linux/timex.h:56,
                    from include/linux/timex.h:56,
                    from include/linux/sched.h:19,
                    from arch/powerpc/kernel/vdso.c:13:
   include/linux/scatterlist.h: In function 'sg_set_buf':
...
> arch/powerpc/include/asm/page.h:129:32: error: comparison of
unsigned expression >= 0 is always true [-Werror=type-limits]     #define
pfn_valid(pfn)  ((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr)
                                   ^
   include/asm-generic/bug.h:146:36: note: in definition of macro 'BUG_ON'
    #define BUG_ON(condition) do { if (condition) BUG(); } while (0)
                                       ^~~~~~~~~
   arch/powerpc/include/asm/page.h:146:32: note: in expansion of macro
'pfn_valid'
    #define virt_addr_valid(kaddr) pfn_valid(virt_to_pfn(kaddr))
                                   ^~~~~~~~~
   include/linux/scatterlist.h:140:10: note: in expansion of macro
'virt_addr_valid'
     BUG_ON(!virt_addr_valid(buf));
             ^~~~~~~~~~~~~~~
   arch/powerpc/kernel/vdso.c: In function 'vdso_fixup_alt_funcs':
   arch/powerpc/kernel/vdso.c:609:16: error: comparison between signed and unsigned
integer expressions [-Werror=sign-compare]
     for (i = 0; i < ARRAY_SIZE(vdso_patches); i++) {
                   ^
   arch/powerpc/kernel/vdso.c: In function 'vdso_init':
   arch/powerpc/kernel/vdso.c:795:16: error: comparison between signed and unsigned
integer expressions [-Werror=sign-compare]
     for (i = 0; i < vdso32_pages; i++) {
                   ^
   cc1: all warnings being treated as errors
--
   In file included from arch/powerpc/kernel/process.c:20:0:
   include/linux/mm.h: In function 'is_vmalloc_addr':
   include/linux/mm.h:386:14: error: comparison between signed and unsigned integer
expressions [-Werror=sign-compare]
     return addr >= VMALLOC_START && addr < VMALLOC_END;
                 ^~
   In file included from include/net/inet_frag.h:4:0,
                    from include/net/netns/ipv4.h:9,
                    from include/net/net_namespace.h:17,
                    from include/linux/init_task.h:15,
                    from arch/powerpc/kernel/process.c:29:
   include/linux/rhashtable.h: In function 'rht_grow_above_75':
   include/linux/rhashtable.h:264:34: error: comparison between signed and unsigned
integer expressions [-Werror=sign-compare]
     return atomic_read(&ht->nelems) > (tbl->size / 4 * 3) &&
                                     ^
   include/linux/rhashtable.h: In function 'rht_shrink_below_30':
   include/linux/rhashtable.h:277:34: error: comparison between signed and unsigned
integer expressions [-Werror=sign-compare]
     return atomic_read(&ht->nelems) < (tbl->size * 3 / 10) &&
                                     ^
   include/linux/rhashtable.h: In function 'rht_grow_above_100':
   include/linux/rhashtable.h:289:34: error: comparison between signed and unsigned
integer expressions [-Werror=sign-compare]
     return atomic_read(&ht->nelems) > tbl->size &&
                                     ^
   include/linux/rhashtable.h: In function 'rht_grow_above_max':
   include/linux/rhashtable.h:302:34: error: comparison between signed and unsigned
integer expressions [-Werror=sign-compare]
            atomic_read(&ht->nelems) >= ht->p.insecure_max_entries;
                                     ^~
   In file included from include/net/checksum.h:25:0,
                    from include/linux/skbuff.h:31,
                    from include/net/net_namespace.h:32,
                    from include/linux/init_task.h:15,
                    from arch/powerpc/kernel/process.c:29:
   include/net/checksum.h: In function 'csum_and_copy_from_user':
   arch/powerpc/include/asm/uaccess.h:57:35: error: comparison between signed and unsigned
integer expressions [-Werror=sign-compare]
      (((size) == 0) || (((size) - 1) <= ((segment).seg - (addr)))))
                                      ^
   arch/powerpc/include/asm/uaccess.h:63:3: note: in expansion of macro
'__access_ok'
      __access_ok((__force unsigned long)(addr), (size), get_fs()))
      ^~~~~~~~~~~
   include/net/checksum.h:33:6: note: in expansion of macro 'access_ok'
     if (access_ok(VERIFY_READ, src, len))
         ^~~~~~~~~
   include/net/checksum.h: In function 'csum_and_copy_to_user':
   arch/powerpc/include/asm/uaccess.h:57:35: error: comparison between signed and unsigned
integer expressions [-Werror=sign-compare]
      (((size) == 0) || (((size) - 1) <= ((segment).seg - (addr)))))
                                      ^
   arch/powerpc/include/asm/uaccess.h:63:3: note: in expansion of macro
'__access_ok'
      __access_ok((__force unsigned long)(addr), (size), get_fs()))
      ^~~~~~~~~~~
   include/net/checksum.h:49:6: note: in expansion of macro 'access_ok'
     if (access_ok(VERIFY_WRITE, dst, len)) {
         ^~~~~~~~~
   In file included from arch/powerpc/include/asm/bug.h:127:0,
                    from include/linux/bug.h:4,
                    from include/linux/thread_info.h:11,
                    from include/asm-generic/preempt.h:4,
                    from arch/powerpc/include/generated/asm/preempt.h:1,
                    from include/linux/preempt.h:59,
                    from include/linux/spinlock.h:50,
                    from include/linux/seqlock.h:35,
                    from include/linux/time.h:5,
                    from include/uapi/linux/timex.h:56,
                    from include/linux/timex.h:56,
                    from include/linux/sched.h:19,
                    from arch/powerpc/kernel/process.c:18:
   include/linux/scatterlist.h: In function 'sg_set_buf':
...
> arch/powerpc/include/asm/page.h:129:32: error: comparison of
unsigned expression >= 0 is always true [-Werror=type-limits]     #define
pfn_valid(pfn)  ((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr)
                                   ^
   include/asm-generic/bug.h:146:36: note: in definition of macro 'BUG_ON'
    #define BUG_ON(condition) do { if (condition) BUG(); } while (0)
                                       ^~~~~~~~~
   arch/powerpc/include/asm/page.h:146:32: note: in expansion of macro
'pfn_valid'
    #define virt_addr_valid(kaddr) pfn_valid(virt_to_pfn(kaddr))
                                   ^~~~~~~~~
   include/linux/scatterlist.h:140:10: note: in expansion of macro
'virt_addr_valid'
     BUG_ON(!virt_addr_valid(buf));
             ^~~~~~~~~~~~~~~
   In file included from include/net/net_namespace.h:32:0,
                    from include/linux/init_task.h:15,
                    from arch/powerpc/kernel/process.c:29:
   include/linux/skbuff.h: In function 'skb_add_data':
   include/linux/skbuff.h:2675:23: error: comparison between signed and unsigned integer
expressions [-Werror=sign-compare]
             &csum, from) == copy) {
                          ^~
   include/linux/skbuff.h:2679:60: error: comparison between signed and unsigned integer
expressions [-Werror=sign-compare]
     } else if (copy_from_iter(skb_put(skb, copy), copy, from) == copy)
                                                               ^~
   include/linux/skbuff.h: In function 'skb_can_coalesce':
   include/linux/skbuff.h:2693:14: error: comparison between signed and unsigned integer
expressions [-Werror=sign-compare]
             off == frag->page_offset + skb_frag_size(frag);
                 ^~
   include/linux/skbuff.h: In function 'memcpy_from_msg':
   include/linux/skbuff.h:2921:51: error: comparison between signed and unsigned integer
expressions [-Werror=sign-compare]
     return copy_from_iter(data, len, &msg->msg_iter) == len ? 0 : -EFAULT;
                                                      ^~
   include/linux/skbuff.h: In function 'memcpy_to_msg':
   include/linux/skbuff.h:2926:49: error: comparison between signed and unsigned integer
expressions [-Werror=sign-compare]
     return copy_to_iter(data, len, &msg->msg_iter) == len ? 0 : -EFAULT;
                                                    ^~
   arch/powerpc/kernel/process.c: At top level:
...
> arch/powerpc/kernel/process.c:1088:5: error: no previous
declaration for 'arch_dup_task_struct' [-Werror=missing-declarations]    
int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
        ^~~~~~~~~~~~~~~~~~~~
   arch/powerpc/kernel/process.c:1642:15: error: no previous declaration for
'arch_align_stack' [-Werror=missing-declarations]
    unsigned long arch_align_stack(unsigned long sp)
                  ^~~~~~~~~~~~~~~~
   arch/powerpc/kernel/process.c:1662:15: error: no previous declaration for
'arch_randomize_brk' [-Werror=missing-declarations]
    unsigned long arch_randomize_brk(struct mm_struct *mm)
                  ^~~~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors
..

vim +159 include/asm-generic/bug.h

b607e70ec6a982 Josh Triplett 2014-04-07  155  
b607e70ec6a982 Josh Triplett 2014-04-07  156  #ifndef WARN
b607e70ec6a982 Josh Triplett 2014-04-07  157  #define WARN(condition, format...) ({					\
b607e70ec6a982 Josh Triplett 2014-04-07  158  	int __ret_warn_on = !!(condition);				\
4e50ebde32bed6 Josh Triplett 2014-04-07 @159  	no_printk(format);						\
b607e70ec6a982 Josh Triplett 2014-04-07  160  	unlikely(__ret_warn_on);					\
b607e70ec6a982 Josh Triplett 2014-04-07  161  })
b607e70ec6a982 Josh Triplett 2014-04-07  162  #endif
b607e70ec6a982 Josh Triplett 2014-04-07  163  

:::::: The code at line 159 was first introduced by commit
:::::: 4e50ebde32bed67a9aec8c239bbd89e5d0b8727b bug: when !CONFIG_BUG, make WARN call
no_printk to check format and args

:::::: TO: Josh Triplett <josh(a)joshtriplett.org&gt;
:::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org&gt;

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[kbuild-all] [linux-stable-rc:linux-4.4.y 9981/9999] include/asm-generic/bug.h:159:2: error: implicit declaration of function 'no_printk'; did you mean 'printk'?