linux_dsm_epyc7002/net/mac80211
Andrey Ryabinin 68920c9732 net/mac80211/debugfs.c: prevent build failure with CONFIG_UBSAN=y
With upcoming CONFIG_UBSAN the following BUILD_BUG_ON in
net/mac80211/debugfs.c starts to trigger:

  BUILD_BUG_ON(hw_flag_names[NUM_IEEE80211_HW_FLAGS] != (void *)0x1);

It seems, that compiler instrumentation causes some code
deoptimizations.  Because of that GCC is not being able to resolve
condition in BUILD_BUG_ON() at compile time.

We could make size of hw_flag_names array unspecified and replace the
condition in BUILD_BUG_ON() with following:

  ARRAY_SIZE(hw_flag_names) != NUM_IEEE80211_HW_FLAGS

That will have the same effect as before (adding new flag without
updating array will trigger build failure) except it doesn't fail with
CONFIG_UBSAN.  As a bonus this patch slightly decreases size of
hw_flag_names array.

Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-01-20 17:09:18 -08:00
..
aes_ccm.c
aes_ccm.h
aes_cmac.c
aes_cmac.h
aes_gcm.c
aes_gcm.h
aes_gmac.c
aes_gmac.h
agg-rx.c
agg-tx.c
cfg.c
chan.c
debug.h
debugfs_key.c
debugfs_key.h
debugfs_netdev.c
debugfs_netdev.h
debugfs_sta.c
debugfs_sta.h
debugfs.c
debugfs.h
driver-ops.c
driver-ops.h
ethtool.c
ht.c
ibss.c
ieee80211_i.h
iface.c
Kconfig
key.c
key.h
led.c
led.h
main.c
Makefile
mesh_hwmp.c
mesh_pathtbl.c
mesh_plink.c
mesh_ps.c
mesh_sync.c
mesh.c
mesh.h
michael.c
michael.h
mlme.c
ocb.c
offchannel.c
pm.c
rate.c
rate.h
rc80211_minstrel_debugfs.c
rc80211_minstrel_ht_debugfs.c
rc80211_minstrel_ht.c
rc80211_minstrel_ht.h
rc80211_minstrel.c
rc80211_minstrel.h
rx.c
scan.c
spectmgmt.c
sta_info.c
sta_info.h
status.c
tdls.c
tkip.c
tkip.h
trace_msg.h
trace.c
trace.h
tx.c
util.c
vht.c
wep.c
wep.h
wme.c
wme.h
wpa.c
wpa.h