tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 3266b5bd97eaa72793df0b6e5a106c69ccc166c4 commit: dc1dd184c2f0016bec35c0d7a48c057e0ad763d3 jump_label: Warn on failed jump_label patching attempt date: 2 weeks ago config: sparc64-allyesconfig (attached as .config) compiler: sparc64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout dc1dd184c2f0016bec35c0d7a48c057e0ad763d3 # save the attached .config to linux build tree make.cross ARCH=sparc64
All warnings (new ones prefixed by >>):
In file included from arch/sparc/include/asm/bug.h:21:0,
from include/linux/bug.h:5,
from include/linux/thread_info.h:12,
from arch/sparc/include/asm/current.h:15,
from include/linux/mutex.h:14,
from include/linux/kernfs.h:13,
from include/linux/sysfs.h:16,
from include/linux/kobject.h:20,
from include/linux/device.h:16,
from include/linux/node.h:18,
from include/linux/memory.h:19,
from kernel/jump_label.c:8:
kernel/jump_label.c: In function '__jump_label_update':
>> kernel/jump_label.c:377:51: warning: cast to pointer from integer of
>> different size [-Wint-to-pointer-cast]
WARN_ONCE(1, "can't patch jump_label at %pS", (void *)entry->code);
^
include/asm-generic/bug.h:91:69: note: in definition of macro '__WARN_printf'
#define __WARN_printf(arg...) warn_slowpath_fmt(__FILE__, __LINE__, arg)
^~~
>> include/asm-generic/bug.h:153:3: note: in expansion of macro 'WARN'
WARN(1, format); \
^~~~
>> kernel/jump_label.c:377:5: note: in expansion of macro 'WARN_ONCE'
WARN_ONCE(1, "can't patch jump_label at %pS", (void *)entry->code);
^~~~~~~~~
vim +377 kernel/jump_label.c
363
364 static void __jump_label_update(struct static_key *key,
365 struct jump_entry *entry,
366 struct jump_entry *stop)
367 {
368 for (; (entry < stop) && (jump_entry_key(entry) == key);
entry++) {
369 /*
370 * An entry->code of 0 indicates an entry which has been
371 * disabled because it was in an init text area.
372 */
373 if (entry->code) {
374 if (kernel_text_address(entry->code))
375 arch_jump_label_transform(entry,
jump_label_type(entry));
376 else
> 377 WARN_ONCE(1, "can't patch jump_label at
> %pS", (void *)entry->code);
378 }
379 }
380 }
381
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