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| author | Josh Triplett <josh@joshtriplett.org> | 2014-04-07 15:39:13 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-04-07 16:36:10 -0700 |
| commit | a4b5d580e07875f9be29f62a57c67fbbdbb40ba2 (patch) | |
| tree | 9e995a4804282e64ef13f2ac725b1d1c95a6eb16 /include/asm-generic/bug.h | |
| parent | 4e50ebde32bed67a9aec8c239bbd89e5d0b8727b (diff) | |
| download | linux-a4b5d580e07875f9be29f62a57c67fbbdbb40ba2.tar.gz linux-a4b5d580e07875f9be29f62a57c67fbbdbb40ba2.tar.bz2 linux-a4b5d580e07875f9be29f62a57c67fbbdbb40ba2.zip | |
bug: Make BUG() always stop the machine
When !CONFIG_BUG and !HAVE_ARCH_BUG, define the generic BUG() as an
infinite loop rather than a no-op. This avoids undefined behavior if
execution ever actually reaches BUG(), and avoids warnings about code
after BUG() (such as on non-void functions calling BUG() and then not
returning).
bloat-o-meter results:
add/remove: 0/0 grow/shrink: 43/10 up/down: 235/-98 (137)
function old new delta
umount_collect 119 138 +19
notify_change 306 324 +18
xstate_enable_boot_cpu 252 269 +17
kunmap 54 70 +16
balloon_page_dequeue 112 126 +14
mm_take_all_locks 223 233 +10
list_lru_walk_node 143 152 +9
vma_adjust 1059 1067 +8
pcpu_setup_first_chunk 1130 1138 +8
mm_drop_all_locks 143 151 +8
ns_capable 55 62 +7
anon_transport_class_unregister 8 15 +7
srcu_init_notifier_head 35 41 +6
shrink_dcache_for_umount 174 180 +6
kunmap_high 99 105 +6
end_page_writeback 43 49 +6
do_exit 1339 1345 +6
__kfifo_dma_out_prepare_r 86 92 +6
__kfifo_dma_in_prepare_r 90 96 +6
fixup_user_fault 120 125 +5
repair_env_string 73 77 +4
read_cache_pages_invalidate_page 56 60 +4
isolate_lru_pages.isra 142 146 +4
do_notify_parent_cldstop 255 259 +4
cpu_init 370 374 +4
utimes_common 270 272 +2
tasklet_hi_action 91 93 +2
tasklet_action 91 93 +2
set_pte_vaddr 46 48 +2
find_get_pages_tag 202 204 +2
early_iounmap 185 187 +2
__native_set_fixmap 36 38 +2
__get_user_pages 822 824 +2
__early_ioremap 299 301 +2
yield_task_stop 1 2 +1
tick_resume 37 38 +1
switched_to_stop 1 2 +1
switched_to_idle 1 2 +1
prio_changed_stop 1 2 +1
prio_changed_idle 1 2 +1
pm_qos_power_read 111 112 +1
arch_cpu_idle_dead 1 2 +1
__insert_vmap_area 140 141 +1
sys_renameat 614 612 -2
mm_fault_error 297 295 -2
SyS_renameat 614 612 -2
sys_linkat 416 413 -3
SyS_linkat 416 413 -3
chmod_common 129 122 -7
proc_cap_handler 240 225 -15
__schedule 849 831 -18
sys_madvise 1077 1054 -23
SyS_madvise 1077 1054 -23
Signed-off-by: Josh Triplett <josh@joshtriplett.org>
Reported-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-generic/bug.h')
| -rw-r--r-- | include/asm-generic/bug.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h index a97fa11aaf41..630dd2372238 100644 --- a/include/asm-generic/bug.h +++ b/include/asm-generic/bug.h @@ -138,7 +138,7 @@ extern void warn_slowpath_null(const char *file, const int line); #else /* !CONFIG_BUG */ #ifndef HAVE_ARCH_BUG -#define BUG() do {} while (0) +#define BUG() do {} while (1) #endif #ifndef HAVE_ARCH_BUG_ON |