Messages in this thread | | | Date | Wed, 18 Oct 2023 20:51:15 +0800 | From | Philip Li <> | Subject | Re: arch/m68k/include/asm/raw_io.h:91:13: warning: array subscript 0 is outside array bounds of 'volatile u16[0]' {aka 'volatile short unsigned int[]'} |
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On Wed, Oct 18, 2023 at 08:06:07PM +0800, kernel test robot wrote: > Hi Rob,
Sorry for the wrong bisection that the commit is not the initial cause of the warning, kindly ignore this report.
> > FYI, the error/warning still remains. > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master > head: 06dc10eae55b5ceabfef287a7e5f16ceea204aa0 > commit: f1a43aadb5a690e141a3b6700e2a40c1d4dbe088 watchdog: Enable COMPILE_TEST for more drivers > date: 9 weeks ago > config: m68k-allmodconfig (https://download.01.org/0day-ci/archive/20231018/202310181943.y4q7XNsm-lkp@intel.com/config) > compiler: m68k-linux-gcc (GCC) 13.2.0 > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231018/202310181943.y4q7XNsm-lkp@intel.com/reproduce) > > If you fix the issue in a separate patch/commit (i.e. not just a new version of > the same patch/commit), kindly add following tags > | Reported-by: kernel test robot <lkp@intel.com> > | Closes: https://lore.kernel.org/oe-kbuild-all/202310181943.y4q7XNsm-lkp@intel.com/ > > All warnings (new ones prefixed by >>): > > In file included from arch/m68k/include/asm/io_mm.h:25, > from arch/m68k/include/asm/io.h:8, > from include/linux/io.h:13, > from drivers/watchdog/machzwd.c:39: > In function 'zf_set_timer', > inlined from 'zf_timer_on' at drivers/watchdog/machzwd.c:218:2: > >> arch/m68k/include/asm/raw_io.h:91:13: warning: array subscript 0 is outside array bounds of 'volatile u16[0]' {aka 'volatile short unsigned int[]'} [-Warray-bounds=] > 91 | __w = ((*(__force volatile u16 *) ((_addr & 0xFFFF0000UL) + ((__v >> 8)<<1)))); \ > | ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > arch/m68k/include/asm/io_mm.h:228:20: note: in expansion of macro 'rom_out_le16' > 228 | : rom_out_le16(isa_itw(port), (val))) > | ^~~~~~~~~~~~ > arch/m68k/include/asm/io_mm.h:356:42: note: in expansion of macro 'isa_rom_outw' > 356 | #define outw(val, port) ((port) < 1024 ? isa_rom_outw((val), (port)) : out_le16((port), (val))) > | ^~~~~~~~~~~~ > drivers/watchdog/machzwd.c:74:53: note: in expansion of macro 'outw' > 74 | #define zf_writew(port, data) { outb(port, INDEX); outw(data, DATA_W); } > | ^~~~ > drivers/watchdog/machzwd.c:173:17: note: in expansion of macro 'zf_writew' > 173 | zf_writew(COUNTER_1, new); > | ^~~~~~~~~ > In function 'zf_timer_on': > cc1: note: source object is likely at address zero > In function 'zf_set_timer', > inlined from 'zf_timer_on' at drivers/watchdog/machzwd.c:218:2: > arch/m68k/include/asm/raw_io.h:87:13: warning: array subscript 0 is outside array bounds of 'volatile u16[0]' {aka 'volatile short unsigned int[]'} [-Warray-bounds=] > 87 | __w = ((*(__force volatile u16 *) ((_addr & 0xFFFF0000UL) + ((__v & 0xFF)<<1)))); \ > | ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > arch/m68k/include/asm/io_mm.h:227:20: note: in expansion of macro 'rom_out_be16' > 227 | (ISA_SEX ? rom_out_be16(isa_itw(port), (val)) \ > | ^~~~~~~~~~~~ > arch/m68k/include/asm/io_mm.h:356:42: note: in expansion of macro 'isa_rom_outw' > 356 | #define outw(val, port) ((port) < 1024 ? isa_rom_outw((val), (port)) : out_le16((port), (val))) > | ^~~~~~~~~~~~ > drivers/watchdog/machzwd.c:74:53: note: in expansion of macro 'outw' > 74 | #define zf_writew(port, data) { outb(port, INDEX); outw(data, DATA_W); } > | ^~~~ > drivers/watchdog/machzwd.c:173:17: note: in expansion of macro 'zf_writew' > 173 | zf_writew(COUNTER_1, new); > | ^~~~~~~~~ > In function 'zf_timer_on': > cc1: note: source object is likely at address zero > > > vim +91 arch/m68k/include/asm/raw_io.h > > ^1da177e4c3f41 include/asm-m68k/raw_io.h Linus Torvalds 2005-04-16 49 > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 50 /* > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 51 * Atari ROM port (cartridge port) ISA adapter, used for the EtherNEC NE2000 > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 52 * network card driver. > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 53 * The ISA adapter connects address lines A9-A13 to ISA address lines A0-A4, > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 54 * and hardwires the rest of the ISA addresses for a base address of 0x300. > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 55 * > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 56 * Data lines D8-D15 are connected to ISA data lines D0-D7 for reading. > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 57 * For writes, address lines A1-A8 are latched to ISA data lines D0-D7 > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 58 * (meaning the bit pattern on A1-A8 can be read back as byte). > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 59 * > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 60 * Read and write operations are distinguished by the base address used: > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 61 * reads are from the ROM A side range, writes are through the B side range > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 62 * addresses (A side base + 0x10000). > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 63 * > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 64 * Reads and writes are byte only. > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 65 * > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 66 * 16 bit reads and writes are necessary for the NetUSBee adapter's USB > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 67 * chipset - 16 bit words are read straight off the ROM port while 16 bit > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 68 * reads are split into two byte writes. The low byte is latched to the > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 69 * NetUSBee buffer by a read from the _read_ window (with the data pattern > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 70 * asserted as A1-A8 address pattern). The high byte is then written to the > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 71 * write range as usual, completing the write cycle. > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 72 */ > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 73 > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 74 #if defined(CONFIG_ATARI_ROM_ISA) > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 75 #define rom_in_8(addr) \ > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 76 ({ u16 __v = (*(__force volatile u16 *) (addr)); __v >>= 8; __v; }) > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 77 #define rom_in_be16(addr) \ > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 78 ({ u16 __v = (*(__force volatile u16 *) (addr)); __v; }) > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 79 #define rom_in_le16(addr) \ > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 80 ({ u16 __v = le16_to_cpu(*(__force volatile u16 *) (addr)); __v; }) > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 81 > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 82 #define rom_out_8(addr, b) \ > 30b5e6ef4a32ea arch/m68k/include/asm/raw_io.h Geert Uytterhoeven 2022-05-20 83 (void)({u8 __maybe_unused __w, __v = (b); u32 _addr = ((u32) (addr)); \ > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 84 __w = ((*(__force volatile u8 *) ((_addr | 0x10000) + (__v<<1)))); }) > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 85 #define rom_out_be16(addr, w) \ > 30b5e6ef4a32ea arch/m68k/include/asm/raw_io.h Geert Uytterhoeven 2022-05-20 86 (void)({u16 __maybe_unused __w, __v = (w); u32 _addr = ((u32) (addr)); \ > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 87 __w = ((*(__force volatile u16 *) ((_addr & 0xFFFF0000UL) + ((__v & 0xFF)<<1)))); \ > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 88 __w = ((*(__force volatile u16 *) ((_addr | 0x10000) + ((__v >> 8)<<1)))); }) > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 89 #define rom_out_le16(addr, w) \ > 30b5e6ef4a32ea arch/m68k/include/asm/raw_io.h Geert Uytterhoeven 2022-05-20 90 (void)({u16 __maybe_unused __w, __v = (w); u32 _addr = ((u32) (addr)); \ > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 @91 __w = ((*(__force volatile u16 *) ((_addr & 0xFFFF0000UL) + ((__v >> 8)<<1)))); \ > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 92 __w = ((*(__force volatile u16 *) ((_addr | 0x10000) + ((__v & 0xFF)<<1)))); }) > 84b16b7b0d5c81 arch/m68k/include/asm/raw_io.h Michael Schmitz 2013-04-06 93 > > :::::: The code at line 91 was first introduced by commit > :::::: 84b16b7b0d5c818fadc731a69965dc76dce0c91e m68k/atari: ROM port ISA adapter support > > :::::: TO: Michael Schmitz <schmitz@opal.biophys.uni-duesseldorf.de> > :::::: CC: Geert Uytterhoeven <geert@linux-m68k.org> > > -- > 0-DAY CI Kernel Test Service > https://github.com/intel/lkp-tests/wiki >
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