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[]'}

From: Philip Li
Date: Wed Oct 18 2023 - 08:51:37 EST

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In reply to: kernel test robot: "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@xxxxxxxxx/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@xxxxxxxxx/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@xxxxxxxxx>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202310181943.y4q7XNsm-lkp@xxxxxxxxx/
>
> 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@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
> :::::: CC: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki
>

Next message: Mark Rutland: "Re: [PATCH 0/4] arm64: Make Aarch32 compatibility enablement optional at boot"
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In reply to: kernel test robot: "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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