[toke:xdp-queueing-04 3/12] kernel/bpf/pifomap.c:354:22: warning: no previous prototype for function '__pifo_map_dequeue'
From: kernel test robot
Date: Sat Apr 09 2022 - 20:52:49 EST
tree: https://git.kernel.org/pub/scm/linux/kernel/git/toke/linux.git xdp-queueing-04
head: d67202baf237752a91366c8ba9bd801942e5fdaf
commit: fe606924ca53da2ffef87d4234ef54a5f1b66fbb [3/12] bpf: Add a PIFO map type for queueing packets
config: x86_64-randconfig-a001 (https://download.01.org/0day-ci/archive/20220410/202204100802.zdu77Ho5-lkp@xxxxxxxxx/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 256c6b0ba14e8a7ab6373b61b7193ea8c0a3651c)
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/toke/linux.git/commit/?id=fe606924ca53da2ffef87d4234ef54a5f1b66fbb
git remote add toke https://git.kernel.org/pub/scm/linux/kernel/git/toke/linux.git
git fetch --no-tags toke xdp-queueing-04
git checkout fe606924ca53da2ffef87d4234ef54a5f1b66fbb
# save the config file to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash kernel/bpf/
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
All warnings (new ones prefixed by >>):
kernel/bpf/pifomap.c:308:40: error: implicitly declaring library function 'index' with type 'char *(const char *, int)' [-Werror,-Wimplicit-function-declaration]
q_index = rank - min(queue->min_rank, index);
^
kernel/bpf/pifomap.c:308:40: note: include the header <strings.h> or explicitly provide a declaration for 'index'
kernel/bpf/pifomap.c:308:19: warning: comparison of distinct pointer types ('typeof (queue->min_rank) *' (aka 'unsigned long long *') and 'typeof (index) *' (aka 'char *(*)(const char *, int)')) [-Wcompare-distinct-pointer-types]
q_index = rank - min(queue->min_rank, index);
^~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/minmax.h:45:19: note: expanded from macro 'min'
#define min(x, y) __careful_cmp(x, y, <)
^~~~~~~~~~~~~~~~~~~~~~
include/linux/minmax.h:36:24: note: expanded from macro '__careful_cmp'
__builtin_choose_expr(__safe_cmp(x, y), \
^~~~~~~~~~~~~~~~
include/linux/minmax.h:26:4: note: expanded from macro '__safe_cmp'
(__typecheck(x, y) && __no_side_effects(x, y))
^~~~~~~~~~~~~~~~~
include/linux/minmax.h:20:28: note: expanded from macro '__typecheck'
(!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~
kernel/bpf/pifomap.c:308:19: warning: ordered comparison between pointer and integer ('u64' (aka 'unsigned long long') and 'char *(*)(const char *, int)')
q_index = rank - min(queue->min_rank, index);
^~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/minmax.h:45:39: note: expanded from macro 'min'
#define min(x, y) __careful_cmp(x, y, <)
~~~~~~~~~~~~~~~~~~~~^~
include/linux/minmax.h:37:15: note: expanded from macro '__careful_cmp'
__cmp(x, y, op), \
~~~~~~~~~~~~^~~
include/linux/minmax.h:28:30: note: expanded from macro '__cmp'
#define __cmp(x, y, op) ((x) op (y) ? (x) : (y))
~~~ ^ ~~~
kernel/bpf/pifomap.c:308:19: warning: pointer/integer type mismatch in conditional expression ('u64' (aka 'unsigned long long') and 'char *(*)(const char *, int)') [-Wconditional-type-mismatch]
q_index = rank - min(queue->min_rank, index);
^~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/minmax.h:45:19: note: expanded from macro 'min'
#define min(x, y) __careful_cmp(x, y, <)
^~~~~~~~~~~~~~~~~~~~~~
include/linux/minmax.h:37:3: note: expanded from macro '__careful_cmp'
__cmp(x, y, op), \
^~~~~~~~~~~~~~~
include/linux/minmax.h:28:37: note: expanded from macro '__cmp'
#define __cmp(x, y, op) ((x) op (y) ? (x) : (y))
^ ~~~ ~~~
kernel/bpf/pifomap.c:308:19: error: illegal initializer (only variables can be initialized)
include/linux/minmax.h:45:19: note: expanded from macro 'min'
#define min(x, y) __careful_cmp(x, y, <)
^
include/linux/minmax.h:38:38: note: expanded from macro '__careful_cmp'
__cmp_once(x, y, __UNIQUE_ID(__x), __UNIQUE_ID(__y), op))
^
include/linux/compiler-clang.h:11:29: note: expanded from macro '__UNIQUE_ID'
#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
^
include/linux/compiler_types.h:68:22: note: expanded from macro '__PASTE'
#define __PASTE(a,b) ___PASTE(a,b)
^
include/linux/compiler_types.h:67:23: note: expanded from macro '___PASTE'
#define ___PASTE(a,b) a##b
^
<scratch space>:98:1: note: expanded from here
__UNIQUE_ID___y828
^
>> kernel/bpf/pifomap.c:354:22: warning: no previous prototype for function '__pifo_map_dequeue' [-Wmissing-prototypes]
union bpf_pifo_item *__pifo_map_dequeue(struct bpf_pifo_map *pifo, u64 flags, u64 *rank, bool xdp)
^
kernel/bpf/pifomap.c:354:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
union bpf_pifo_item *__pifo_map_dequeue(struct bpf_pifo_map *pifo, u64 flags, u64 *rank, bool xdp)
^
static
4 warnings and 2 errors generated.
vim +/__pifo_map_dequeue +354 kernel/bpf/pifomap.c
353
> 354 union bpf_pifo_item *__pifo_map_dequeue(struct bpf_pifo_map *pifo, u64 flags, u64 *rank, bool xdp)
355 {
356 struct bpf_pifo_queue *queue = pifo->queue;
357 struct bpf_pifo_bucket *bucket;
358 union bpf_pifo_item *item;
359 unsigned long bucket_idx;
360
361 lockdep_assert_held(&pifo->lock);
362
363 if (flags) {
364 *rank = -EINVAL;
365 return NULL;
366 }
367
368 bucket_idx = pifo_find_first_bucket(queue);
369 if (bucket_idx == -1) {
370 *rank = -ENOENT;
371 return NULL;
372 }
373 bucket = &queue->buckets[bucket_idx];
374
375 if (WARN_ON_ONCE(!bucket->tail)) {
376 *rank = -EFAULT;
377 return NULL;
378 }
379
380 item = bucket->head;
381 if (xdp)
382 bucket->head = (union bpf_pifo_item *)item->frame.next;
383 else
384 bucket->head = (union bpf_pifo_item *)item->elem.next;
385
386 if (!bucket->head) {
387 bucket->tail = NULL;
388 pifo_clear_bit(queue, bucket_idx);
389 }
390 pifo->num_queued--;
391 bucket->elem_count--;
392
393 *rank = bucket_idx + queue->min_rank;
394 return item;
395 }
396
--
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