[kbuild-all] [kees:for-next/array-bounds 9/10] arch/m68k/include/asm/cmpxchg.h:64:17: warning: array subscript 'volatile struct __xchg_dummy[0]' is partly outside array bounds of 'atomic_t[1]'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/array-bounds head: 3ccac0d2ba34a8e6f722975136f06c30fb586ca0 commit: 4ba545781e20f49cf1175e11d9f606e621040acf [9/10] Makefile: Enable -Warray-bounds config: m68k-allyesconfig (https://download.01.org/0day-ci/archive/20220125/202201251648.VyzfPvSk-lk...) compiler: m68k-linux-gcc (GCC) 11.2.0 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/kees/linux.git/commit/?id... git remote add kees https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git git fetch --no-tags kees for-next/array-bounds git checkout 4ba545781e20f49cf1175e11d9f606e621040acf # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=m68k SHELL=/bin/bash block/ drivers/accessibility/speakup/ drivers/infiniband/sw/siw/ kernel/rcu/ mm/ net/ipv4/ net/sched/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): In file included from arch/m68k/include/asm/atomic.h:7, from include/linux/atomic.h:7, from include/linux/cpumask.h:13, from include/linux/smp.h:13, from include/linux/lockdep.h:14, from include/linux/spinlock.h:62, from include/linux/mmzone.h:8, from include/linux/gfp.h:6, from include/linux/mm.h:10, from mm/swap_state.c:10: mm/swap_state.c: In function 'swap_cluster_readahead': 64 | __asm__ __volatile__ | ^~~~~~~ mm/swap_state.c:71:17: note: while referencing 'swapin_readahead_hits' 71 | static atomic_t swapin_readahead_hits = ATOMIC_INIT(4); | ^~~~~~~~~~~~~~~~~~~~~ -- In file included from arch/m68k/include/asm/atomic.h:7, from include/linux/atomic.h:7, from include/linux/mm_types_task.h:13, from include/linux/mm_types.h:5, from include/linux/buildid.h:5, from include/linux/module.h:14, from kernel/rcu/rcutorture.c:18: kernel/rcu/rcutorture.c: In function 'rcu_torture_stats_print': 64 | __asm__ __volatile__ | ^~~~~~~ In file included from kernel/rcu/rcutorture.c:51: kernel/rcu/rcu.h:254:25: note: while referencing '___rfd_beenhere' 254 | static atomic_t ___rfd_beenhere = ATOMIC_INIT(0); \ | ^~~~~~~~~~~~~~~ kernel/rcu/rcutorture.c:1915:17: note: in expansion of macro 'rcu_ftrace_dump' 1915 | rcu_ftrace_dump(DUMP_ALL); | ^~~~~~~~~~~~~~~ In file included from arch/m68k/include/asm/atomic.h:7, from include/linux/atomic.h:7, from include/linux/mm_types_task.h:13, from include/linux/mm_types.h:5, from include/linux/buildid.h:5, from include/linux/module.h:14, from kernel/rcu/rcutorture.c:18: kernel/rcu/rcutorture.c: In function 'rcu_torture_writer': 64 | __asm__ __volatile__ | ^~~~~~~ In file included from kernel/rcu/rcutorture.c:51: kernel/rcu/rcu.h:254:25: note: while referencing '___rfd_beenhere' 254 | static atomic_t ___rfd_beenhere = ATOMIC_INIT(0); \ | ^~~~~~~~~~~~~~~ kernel/rcu/rcutorture.c:1287:41: note: in expansion of macro 'rcu_ftrace_dump' 1287 | rcu_ftrace_dump(DUMP_ALL); | ^~~~~~~~~~~~~~~ In file included from arch/m68k/include/asm/atomic.h:7, from include/linux/atomic.h:7, from include/linux/mm_types_task.h:13, from include/linux/mm_types.h:5, from include/linux/buildid.h:5, from include/linux/module.h:14, from kernel/rcu/rcutorture.c:18: kernel/rcu/rcutorture.c: In function 'rcu_torture_fwd_prog': 64 | __asm__ __volatile__ | ^~~~~~~ kernel/rcu/rcutorture.c:2170:22: note: while referencing 'rcu_fwd_max_cbs' 2170 | static atomic_long_t rcu_fwd_max_cbs; | ^~~~~~~~~~~~~~~ In file included from arch/m68k/include/asm/atomic.h:7, from include/linux/atomic.h:7, from include/linux/mm_types_task.h:13, from include/linux/mm_types.h:5, from include/linux/buildid.h:5, from include/linux/module.h:14, from kernel/rcu/rcutorture.c:18: kernel/rcu/rcutorture.c: In function 'rcu_torture_one_read': 64 | __asm__ __volatile__ | ^~~~~~~ In file included from kernel/rcu/rcutorture.c:51: kernel/rcu/rcu.h:254:25: note: while referencing '___rfd_beenhere' 254 | static atomic_t ___rfd_beenhere = ATOMIC_INIT(0); \ | ^~~~~~~~~~~~~~~ kernel/rcu/rcutorture.c:1650:17: note: in expansion of macro 'rcu_ftrace_dump' 1650 | rcu_ftrace_dump(DUMP_ALL); | ^~~~~~~~~~~~~~~ In file included from arch/m68k/include/asm/atomic.h:7, from include/linux/atomic.h:7, from include/linux/mm_types_task.h:13, from include/linux/mm_types.h:5, from include/linux/buildid.h:5, from include/linux/module.h:14, from kernel/rcu/rcutorture.c:18: 64 | __asm__ __volatile__ | ^~~~~~~ kernel/rcu/rcutorture.c:241:12: note: while referencing 'err_segs_recorded' 241 | static int err_segs_recorded; | ^~~~~~~~~~~~~~~~~ -- In file included from arch/m68k/include/asm/atomic.h:7, from include/linux/atomic.h:7, from include/linux/cpumask.h:13, from include/linux/smp.h:13, from include/linux/lockdep.h:14, from include/linux/spinlock.h:62, from include/linux/mmzone.h:8, from include/linux/gfp.h:6, from include/linux/mm.h:10, from kernel/rcu/rcuscale.c:15: kernel/rcu/rcuscale.c: In function 'rcu_scale_writer': 64 | __asm__ __volatile__ | ^~~~~~~ In file included from kernel/rcu/rcuscale.c:43: kernel/rcu/rcu.h:254:25: note: while referencing '___rfd_beenhere' 254 | static atomic_t ___rfd_beenhere = ATOMIC_INIT(0); \ | ^~~~~~~~~~~~~~~ kernel/rcu/rcuscale.c:464:33: note: in expansion of macro 'rcu_ftrace_dump' 464 | rcu_ftrace_dump(DUMP_ALL); | ^~~~~~~~~~~~~~~ -- In file included from arch/m68k/include/asm/atomic.h:7, from include/linux/atomic.h:7, from include/linux/mm_types_task.h:13, from include/linux/mm_types.h:5, from include/linux/buildid.h:5, from include/linux/module.h:14, from block/blk-mq.c:9: block/blk-mq.c: In function 'blk_complete_reqs.constprop': 64 | __asm__ __volatile__ | ^~~~~~~ In file included from include/asm-generic/percpu.h:7, from ./arch/m68k/include/generated/asm/percpu.h:1, from include/linux/irqflags.h:17, from arch/m68k/include/asm/atomic.h:6, from include/linux/atomic.h:7, from include/linux/mm_types_task.h:13, from include/linux/mm_types.h:5, from include/linux/buildid.h:5, from include/linux/module.h:14, from block/blk-mq.c:9: block/blk-mq.c:46:42: note: while referencing 'blk_cpu_done' 46 | static DEFINE_PER_CPU(struct llist_head, blk_cpu_done); | ^~~~~~~~~~~~ include/linux/percpu-defs.h:95:51: note: in definition of macro 'DEFINE_PER_CPU_SECTION' 95 | __PCPU_ATTRS(sec) __weak __typeof__(type) name | ^~~~ block/blk-mq.c:46:8: note: in expansion of macro 'DEFINE_PER_CPU' 46 | static DEFINE_PER_CPU(struct llist_head, blk_cpu_done); | ^~~~~~~~~~~~~~ -- In file included from arch/m68k/include/asm/atomic.h:7, from include/linux/atomic.h:7, from include/linux/rcupdate.h:25, from include/linux/rculist.h:11, from include/linux/pid.h:5, from include/linux/sched.h:14, from include/linux/ratelimit.h:6, from include/linux/dev_printk.h:16, from include/linux/device.h:15, from include/linux/miscdevice.h:7, from drivers/accessibility/speakup/devsynth.c:3: drivers/accessibility/speakup/devsynth.c: In function 'speakup_file_open': 64 | __asm__ __volatile__ | ^~~~~~~ drivers/accessibility/speakup/devsynth.c:11:12: note: while referencing 'dev_opened' 11 | static int dev_opened; | ^~~~~~~~~~ -- In file included from arch/m68k/include/asm/atomic.h:7, from include/linux/atomic.h:7, from include/linux/cpumask.h:13, from include/linux/smp.h:13, from include/linux/lockdep.h:14, from include/linux/spinlock.h:62, from include/linux/mmzone.h:8, from include/linux/gfp.h:6, from include/linux/slab.h:15, from drivers/accessibility/speakup/selection.c:2: drivers/accessibility/speakup/selection.c: In function 'speakup_cancel_selection': 64 | __asm__ __volatile__ | ^~~~~~~ drivers/accessibility/speakup/selection.c:57:38: note: while referencing 'speakup_sel_work' 57 | static struct speakup_selection_work speakup_sel_work = { | ^~~~~~~~~~~~~~~~ In file included from arch/m68k/include/asm/atomic.h:7, from include/linux/atomic.h:7, from include/linux/cpumask.h:13, from include/linux/smp.h:13, from include/linux/lockdep.h:14, from include/linux/spinlock.h:62, from include/linux/mmzone.h:8, from include/linux/gfp.h:6, from include/linux/slab.h:15, from drivers/accessibility/speakup/selection.c:2: drivers/accessibility/speakup/selection.c: In function 'speakup_cancel_paste': 64 | __asm__ __volatile__ | ^~~~~~~ drivers/accessibility/speakup/selection.c:116:38: note: while referencing 'speakup_paste_work' 116 | static struct speakup_selection_work speakup_paste_work = { | ^~~~~~~~~~~~~~~~~~ -- In file included from arch/m68k/include/asm/atomic.h:7, from include/linux/atomic.h:7, from include/linux/jump_label.h:261, from include/linux/once.h:6, from include/linux/random.h:13, from include/linux/net.h:18, from drivers/infiniband/sw/siw/siw_qp_tx.c:8: drivers/infiniband/sw/siw/siw_qp_tx.c: In function 'siw_run_sq': 64 | __asm__ __volatile__ | ^~~~~~~ In file included from include/asm-generic/percpu.h:7, from ./arch/m68k/include/generated/asm/percpu.h:1, from include/linux/irqflags.h:17, from arch/m68k/include/asm/atomic.h:6, from include/linux/atomic.h:7, from include/linux/jump_label.h:261, from include/linux/once.h:6, from include/linux/random.h:13, from include/linux/net.h:18, from drivers/infiniband/sw/siw/siw_qp_tx.c:8: drivers/infiniband/sw/siw/siw_qp_tx.c:1200:41: note: while referencing 'siw_tx_task_g' 1200 | static DEFINE_PER_CPU(struct tx_task_t, siw_tx_task_g); | ^~~~~~~~~~~~~ include/linux/percpu-defs.h:95:51: note: in definition of macro 'DEFINE_PER_CPU_SECTION' 95 | __PCPU_ATTRS(sec) __weak __typeof__(type) name | ^~~~ drivers/infiniband/sw/siw/siw_qp_tx.c:1200:8: note: in expansion of macro 'DEFINE_PER_CPU' 1200 | static DEFINE_PER_CPU(struct tx_task_t, siw_tx_task_g); | ^~~~~~~~~~~~~~ In file included from arch/m68k/include/asm/atomic.h:7, from include/linux/atomic.h:7, from include/linux/jump_label.h:261, from include/linux/once.h:6, from include/linux/random.h:13, from include/linux/net.h:18, from drivers/infiniband/sw/siw/siw_qp_tx.c:8: 64 | __asm__ __volatile__ | ^~~~~~~ In file included from include/asm-generic/percpu.h:7, from ./arch/m68k/include/generated/asm/percpu.h:1, from include/linux/irqflags.h:17, from arch/m68k/include/asm/atomic.h:6, from include/linux/atomic.h:7, from include/linux/jump_label.h:261, from include/linux/once.h:6, from include/linux/random.h:13, from include/linux/net.h:18, from drivers/infiniband/sw/siw/siw_qp_tx.c:8: drivers/infiniband/sw/siw/siw_qp_tx.c:1200:41: note: while referencing 'siw_tx_task_g' 1200 | static DEFINE_PER_CPU(struct tx_task_t, siw_tx_task_g); | ^~~~~~~~~~~~~ include/linux/percpu-defs.h:95:51: note: in definition of macro 'DEFINE_PER_CPU_SECTION' 95 | __PCPU_ATTRS(sec) __weak __typeof__(type) name | ^~~~ drivers/infiniband/sw/siw/siw_qp_tx.c:1200:8: note: in expansion of macro 'DEFINE_PER_CPU' 1200 | static DEFINE_PER_CPU(struct tx_task_t, siw_tx_task_g); | ^~~~~~~~~~~~~~ -- In file included from arch/m68k/include/asm/atomic.h:7, from include/linux/atomic.h:7, from include/linux/crypto.h:15, from include/crypto/hash.h:11, from net/ipv4/tcp.c:246: net/ipv4/tcp.c: In function 'tcp_leave_memory_pressure': 64 | __asm__ __volatile__ | ^~~~~~~ In file included from include/linux/linkage.h:7, from include/linux/preempt.h:10, from arch/m68k/include/asm/irqflags.h:6, from include/linux/irqflags.h:16, from arch/m68k/include/asm/atomic.h:6, from include/linux/atomic.h:7, from include/linux/crypto.h:15, from include/crypto/hash.h:11, from net/ipv4/tcp.c:246: net/ipv4/tcp.c:325:19: note: while referencing 'tcp_memory_pressure' 325 | EXPORT_SYMBOL_GPL(tcp_memory_pressure); | ^~~~~~~~~~~~~~~~~~~ include/linux/export.h:98:28: note: in definition of macro '___EXPORT_SYMBOL' 98 | extern typeof(sym) sym; \ | ^~~ include/linux/export.h:160:41: note: in expansion of macro '__EXPORT_SYMBOL' 160 | #define _EXPORT_SYMBOL(sym, sec) __EXPORT_SYMBOL(sym, sec, "") | ^~~~~~~~~~~~~~~ include/linux/export.h:164:41: note: in expansion of macro '_EXPORT_SYMBOL' 164 | #define EXPORT_SYMBOL_GPL(sym) _EXPORT_SYMBOL(sym, "_gpl") | ^~~~~~~~~~~~~~ net/ipv4/tcp.c:325:1: note: in expansion of macro 'EXPORT_SYMBOL_GPL' 325 | EXPORT_SYMBOL_GPL(tcp_memory_pressure); | ^~~~~~~~~~~~~~~~~ .. vim +64 arch/m68k/include/asm/cmpxchg.h 803f69144f0d48 David Howells 2012-03-28 11 803f69144f0d48 David Howells 2012-03-28 12 #ifndef CONFIG_RMW_INSNS 803f69144f0d48 David Howells 2012-03-28 13 static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size) 803f69144f0d48 David Howells 2012-03-28 14 { 803f69144f0d48 David Howells 2012-03-28 15 unsigned long flags, tmp; 803f69144f0d48 David Howells 2012-03-28 16 803f69144f0d48 David Howells 2012-03-28 17 local_irq_save(flags); 803f69144f0d48 David Howells 2012-03-28 18 803f69144f0d48 David Howells 2012-03-28 19 switch (size) { 803f69144f0d48 David Howells 2012-03-28 20 case 1: 803f69144f0d48 David Howells 2012-03-28 21 tmp = *(u8 *)ptr; 803f69144f0d48 David Howells 2012-03-28 22 *(u8 *)ptr = x; 803f69144f0d48 David Howells 2012-03-28 23 x = tmp; 803f69144f0d48 David Howells 2012-03-28 24 break; 803f69144f0d48 David Howells 2012-03-28 25 case 2: 803f69144f0d48 David Howells 2012-03-28 26 tmp = *(u16 *)ptr; 803f69144f0d48 David Howells 2012-03-28 27 *(u16 *)ptr = x; 803f69144f0d48 David Howells 2012-03-28 28 x = tmp; 803f69144f0d48 David Howells 2012-03-28 29 break; 803f69144f0d48 David Howells 2012-03-28 30 case 4: 803f69144f0d48 David Howells 2012-03-28 31 tmp = *(u32 *)ptr; 803f69144f0d48 David Howells 2012-03-28 32 *(u32 *)ptr = x; 803f69144f0d48 David Howells 2012-03-28 33 x = tmp; 803f69144f0d48 David Howells 2012-03-28 34 break; 803f69144f0d48 David Howells 2012-03-28 35 default: 803f69144f0d48 David Howells 2012-03-28 36 tmp = __invalid_xchg_size(x, ptr, size); 803f69144f0d48 David Howells 2012-03-28 37 break; 803f69144f0d48 David Howells 2012-03-28 38 } 803f69144f0d48 David Howells 2012-03-28 39 803f69144f0d48 David Howells 2012-03-28 40 local_irq_restore(flags); 803f69144f0d48 David Howells 2012-03-28 41 return x; 803f69144f0d48 David Howells 2012-03-28 42 } 803f69144f0d48 David Howells 2012-03-28 43 #else 803f69144f0d48 David Howells 2012-03-28 44 static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size) 803f69144f0d48 David Howells 2012-03-28 45 { 803f69144f0d48 David Howells 2012-03-28 46 switch (size) { 803f69144f0d48 David Howells 2012-03-28 47 case 1: 803f69144f0d48 David Howells 2012-03-28 48 __asm__ __volatile__ 803f69144f0d48 David Howells 2012-03-28 49 ("moveb %2,%0\n\t" 803f69144f0d48 David Howells 2012-03-28 50 "1:\n\t" 803f69144f0d48 David Howells 2012-03-28 51 "casb %0,%1,%2\n\t" 803f69144f0d48 David Howells 2012-03-28 52 "jne 1b" 803f69144f0d48 David Howells 2012-03-28 53 : "=&d" (x) : "d" (x), "m" (*__xg(ptr)) : "memory"); 803f69144f0d48 David Howells 2012-03-28 54 break; 803f69144f0d48 David Howells 2012-03-28 55 case 2: 803f69144f0d48 David Howells 2012-03-28 56 __asm__ __volatile__ 803f69144f0d48 David Howells 2012-03-28 57 ("movew %2,%0\n\t" 803f69144f0d48 David Howells 2012-03-28 58 "1:\n\t" 803f69144f0d48 David Howells 2012-03-28 59 "casw %0,%1,%2\n\t" 803f69144f0d48 David Howells 2012-03-28 60 "jne 1b" 803f69144f0d48 David Howells 2012-03-28 61 : "=&d" (x) : "d" (x), "m" (*__xg(ptr)) : "memory"); 803f69144f0d48 David Howells 2012-03-28 62 break; 803f69144f0d48 David Howells 2012-03-28 63 case 4: 803f69144f0d48 David Howells 2012-03-28 @64 __asm__ __volatile__ 803f69144f0d48 David Howells 2012-03-28 65 ("movel %2,%0\n\t" 803f69144f0d48 David Howells 2012-03-28 66 "1:\n\t" 803f69144f0d48 David Howells 2012-03-28 67 "casl %0,%1,%2\n\t" 803f69144f0d48 David Howells 2012-03-28 68 "jne 1b" 803f69144f0d48 David Howells 2012-03-28 69 : "=&d" (x) : "d" (x), "m" (*__xg(ptr)) : "memory"); 803f69144f0d48 David Howells 2012-03-28 70 break; 803f69144f0d48 David Howells 2012-03-28 71 default: 803f69144f0d48 David Howells 2012-03-28 72 x = __invalid_xchg_size(x, ptr, size); 803f69144f0d48 David Howells 2012-03-28 73 break; 803f69144f0d48 David Howells 2012-03-28 74 } 803f69144f0d48 David Howells 2012-03-28 75 return x; 803f69144f0d48 David Howells 2012-03-28 76 } 803f69144f0d48 David Howells 2012-03-28 77 #endif 803f69144f0d48 David Howells 2012-03-28 78 :::::: The code at line 64 was first introduced by commit :::::: 803f69144f0d48863c68f9d111b56849c7cef5bb Disintegrate asm/system.h for M68K :::::: TO: David Howells <dhowells(a)redhat.com&gt; :::::: CC: David Howells <dhowells(a)redhat.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org