tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-3.14.y head: 836a24d6291c76c802d0968be9efb050dbf955e6 commit: 3711edaf01a01818f2aed9f21efe29b9818134b9 [4656/4787] compiler-gcc: integrate the various compiler-gcc[345].h files config: i386-randconfig-s1-201627 (attached as .config) compiler: gcc-6 (Debian 6.1.1-1) 6.1.1 20160430 reproduce: git checkout 3711edaf01a01818f2aed9f21efe29b9818134b9 # save the attached .config to linux build tree make ARCH=i386 All warnings (new ones prefixed by >>): In file included from include/uapi/linux/stddef.h:1:0, from include/linux/stddef.h:4, from include/uapi/linux/posix_types.h:4, from include/uapi/linux/types.h:13, from include/linux/types.h:5, from include/linux/list.h:4, from include/linux/module.h:9, from drivers/hid/hid-input.c:28: drivers/hid/hid-input.c: In function 'hidinput_hid_event': drivers/hid/hid-input.c:1087:67: warning: logical not is only applied to the left hand side of comparison [-Wlogical-not-parentheses] if (usage->type == EV_KEY && !!test_bit(usage->code, input->key) != value) ^ include/linux/compiler.h:134:30: note: in definition of macro '__trace_if' if (__builtin_constant_p(!!(cond)) ? !!(cond) : \ ^~~~ >> drivers/hid/hid-input.c:1087:2: note: in expansion of macro 'if' if (usage->type == EV_KEY && !!test_bit(usage->code, input->key) != value) ^~ drivers/hid/hid-input.c:1087:67: warning: logical not is only applied to the left hand side of comparison [-Wlogical-not-parentheses] if (usage->type == EV_KEY && !!test_bit(usage->code, input->key) != value) ^ include/linux/compiler.h:134:42: note: in definition of macro '__trace_if' if (__builtin_constant_p(!!(cond)) ? !!(cond) : \ ^~~~ >> drivers/hid/hid-input.c:1087:2: note: in expansion of macro 'if' if (usage->type == EV_KEY && !!test_bit(usage->code, input->key) != value) ^~ drivers/hid/hid-input.c:1087:67: warning: logical not is only applied to the left hand side of comparison [-Wlogical-not-parentheses] if (usage->type == EV_KEY && !!test_bit(usage->code, input->key) != value) ^ include/linux/compiler.h:145:16: note: in definition of macro '__trace_if' ______r = !!(cond); \ ^~~~ >> drivers/hid/hid-input.c:1087:2: note: in expansion of macro 'if' if (usage->type == EV_KEY && !!test_bit(usage->code, input->key) != value) ^~ -- drivers/usb/gadget/f_fs.c: In function 'ffs_epfile_io': >> drivers/usb/gadget/f_fs.c:670:17: warning: 'data_len' may be used uninitialized in this function [-Wmaybe-uninitialized] req->length = data_len; ~~~~~~~~~~~~~~^~~~~~~~~~ -- drivers/video/i740fb.c: In function 'i740fb_decode_var': >> drivers/video/i740fb.c:661:26: warning: 'wm' may be used uninitialized in this function [-Wmaybe-uninitialized] par->lmi_fifo_watermark = ~~~~~~~~~~~~~~~~~~~~~~~~^ i740_calc_fifo(par, 1000000 / var->pixclock, bpp); ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -- In file included from include/uapi/linux/stddef.h:1:0, from include/linux/stddef.h:4, from include/uapi/linux/posix_types.h:4, from include/uapi/linux/types.h:13, from include/linux/types.h:5, from include/uapi/linux/capability.h:16, from include/linux/capability.h:15, from include/linux/sched.h:13, from include/linux/cgroup.h:11, from kernel/cgroup.c:29: kernel/cgroup.c: In function 'parse_cgroupfs_options': include/linux/compiler.h:134:5: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if (__builtin_constant_p(!!(cond)) ? !!(cond) : \ ^ include/linux/compiler.h:132:23: note: in expansion of macro '__trace_if' #define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) ) ^~~~~~~~~~ >> kernel/cgroup.c:1235:2: note: in expansion of macro 'if' if (all_ss || (!one_ss && !opts->none && !opts->name)) ^~ At top level: kernel/cgroup.c:3839:36: warning: 'cgroup_pidlist_seq_operations' defined but not used [-Wunused-const-variable=] static const struct seq_operations cgroup_pidlist_seq_operations = { ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -- net/bluetooth/hidp/core.c: In function 'hidp_connection_add': >> net/bluetooth/hidp/core.c:1372:8: warning: 'session' may be used uninitialized in this function [-Wmaybe-uninitialized] ret = l2cap_register_user(conn, &session->user); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -- In file included from sound/usb/usx2y/us122l.c:20:0: sound/usb/usx2y/us122l.c: In function 'snd_us122l_probe': >> include/linux/usb.h:199:2: warning: 'card' may be used uninitialized in this function [-Wmaybe-uninitialized] dev_set_drvdata(&intf->dev, data); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ sound/usb/usx2y/us122l.c:607:19: note: 'card' was declared here struct snd_card *card; ^~~~ In file included from sound/usb/usx2y/us122l.c:23:0: >> include/sound/core.h:305:53: warning: 'card' may be used uninitialized in this function [-Wmaybe-uninitialized] #define snd_card_set_dev(card, devptr) ((card)->dev = (devptr)) ^ sound/usb/usx2y/us122l.c:578:19: note: 'card' was declared here struct snd_card *card; ^~~~ -- In file included from sound/usb/usx2y/usbusx2y.c:139:0: sound/usb/usx2y/usbusx2y.c: In function 'snd_usX2Y_probe': >> include/sound/core.h:305:53: warning: 'card' may be used uninitialized in this function [-Wmaybe-uninitialized] #define snd_card_set_dev(card, devptr) ((card)->dev = (devptr)) ^ sound/usb/usx2y/usbusx2y.c:376:20: note: 'card' was declared here struct snd_card * card; ^~~~ vim +/if +1087 drivers/hid/hid-input.c 20f6cd730 David Herrmann 2014-12-29 1071 * not only an optimization but also fixes 'dead' key reports. Some 20f6cd730 David Herrmann 2014-12-29 1072 * RollOver implementations for localized keys (like BACKSLASH/PIPE; HID 20f6cd730 David Herrmann 2014-12-29 1073 * 0x31 and 0x32) report multiple keys, even though a localized keyboard 20f6cd730 David Herrmann 2014-12-29 1074 * can only have one of them physically available. The 'dead' keys 20f6cd730 David Herrmann 2014-12-29 1075 * report constant 0. As all map to the same keycode, they'd confuse 20f6cd730 David Herrmann 2014-12-29 1076 * the input layer. If we filter the 'dead' keys on the HID level, we 20f6cd730 David Herrmann 2014-12-29 1077 * skip the keycode translation and only forward real events. 20f6cd730 David Herrmann 2014-12-29 1078 */ 20f6cd730 David Herrmann 2014-12-29 1079 if (!(field->flags & (HID_MAIN_ITEM_RELATIVE | 20f6cd730 David Herrmann 2014-12-29 1080 HID_MAIN_ITEM_BUFFERED_BYTE)) && f3995eb51 Jiri Kosina 2015-01-06 1081 (field->flags & HID_MAIN_ITEM_VARIABLE) && 20f6cd730 David Herrmann 2014-12-29 1082 usage->usage_index < field->maxusage && 20f6cd730 David Herrmann 2014-12-29 1083 value == field->value[usage->usage_index]) 20f6cd730 David Herrmann 2014-12-29 1084 return; 20f6cd730 David Herrmann 2014-12-29 1085 c01d50d18 Jiri Kosina 2007-08-20 1086 /* report the usage code as scancode if the key status has changed */ c01d50d18 Jiri Kosina 2007-08-20 @1087 if (usage->type == EV_KEY && !!test_bit(usage->code, input->key) != value) c01d50d18 Jiri Kosina 2007-08-20 1088 input_event(input, EV_MSC, MSC_SCAN, usage->hid); 1fe8736da Jiri Kosina 2007-08-09 1089 dde5845a5 Jiri Kosina 2006-12-08 1090 input_event(input, usage->type, usage->code, value); dde5845a5 Jiri Kosina 2006-12-08 1091 dde5845a5 Jiri Kosina 2006-12-08 1092 if ((field->flags & HID_MAIN_ITEM_RELATIVE) && (usage->type == EV_KEY)) dde5845a5 Jiri Kosina 2006-12-08 1093 input_event(input, usage->type, usage->code, 0); dde5845a5 Jiri Kosina 2006-12-08 1094 } dde5845a5 Jiri Kosina 2006-12-08 1095 :::::: The code at line 1087 was first introduced by commit :::::: c01d50d181f074a60bf3ed54eb055ce1679afb98 HID: Report usage codes of keys as EV_MSC scancode events :::::: TO: Jiri Kosina <jkosina@xxxxxxx> :::::: CC: Jiri Kosina <jkosina@xxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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