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Message-ID: <202311101336.BUL1JuvU-lkp@intel.com>
Date: Fri, 10 Nov 2023 13:59:30 +0800
From: kernel test robot <lkp@...el.com>
To: Jiri Slaby <jslaby@...e.cz>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
Masahiro Yamada <masahiroy@...nel.org>
Subject: arch/mips/sgi-ip27/ip27-hubio.c:30: warning: Excess function
parameter 'hub' description in 'hub_pio_map'
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 89cdf9d556016a54ff6ddd62324aa5ec790c05cc
commit: e8a3118e1f5cbe0c26704419390bf074689b349f objtool: make it visible in make V=1 output
date: 7 years ago
config: mips-randconfig-r035-20210927 (https://download.01.org/0day-ci/archive/20231110/202311101336.BUL1JuvU-lkp@intel.com/config)
compiler: mips64-linux-gcc (GCC) 12.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231110/202311101336.BUL1JuvU-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311101336.BUL1JuvU-lkp@intel.com/
All warnings (new ones prefixed by >>):
arch/mips/sgi-ip27/ip27-hubio.c:30: warning: Function parameter or member 'cnode' not described in 'hub_pio_map'
>> arch/mips/sgi-ip27/ip27-hubio.c:30: warning: Excess function parameter 'hub' description in 'hub_pio_map'
vim +30 arch/mips/sgi-ip27/ip27-hubio.c
^1da177e4c3f41 Linus Torvalds 2005-04-16 18
^1da177e4c3f41 Linus Torvalds 2005-04-16 19 /**
^1da177e4c3f41 Linus Torvalds 2005-04-16 20 * hub_pio_map - establish a HUB PIO mapping
^1da177e4c3f41 Linus Torvalds 2005-04-16 21 *
^1da177e4c3f41 Linus Torvalds 2005-04-16 22 * @hub: hub to perform PIO mapping on
^1da177e4c3f41 Linus Torvalds 2005-04-16 23 * @widget: widget ID to perform PIO mapping for
^1da177e4c3f41 Linus Torvalds 2005-04-16 24 * @xtalk_addr: xtalk_address that needs to be mapped
^1da177e4c3f41 Linus Torvalds 2005-04-16 25 * @size: size of the PIO mapping
^1da177e4c3f41 Linus Torvalds 2005-04-16 26 *
^1da177e4c3f41 Linus Torvalds 2005-04-16 27 **/
^1da177e4c3f41 Linus Torvalds 2005-04-16 28 unsigned long hub_pio_map(cnodeid_t cnode, xwidgetnum_t widget,
^1da177e4c3f41 Linus Torvalds 2005-04-16 29 unsigned long xtalk_addr, size_t size)
^1da177e4c3f41 Linus Torvalds 2005-04-16 @30 {
^1da177e4c3f41 Linus Torvalds 2005-04-16 31 nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode);
^1da177e4c3f41 Linus Torvalds 2005-04-16 32 unsigned i;
^1da177e4c3f41 Linus Torvalds 2005-04-16 33
^1da177e4c3f41 Linus Torvalds 2005-04-16 34 /* use small-window mapping if possible */
^1da177e4c3f41 Linus Torvalds 2005-04-16 35 if ((xtalk_addr % SWIN_SIZE) + size <= SWIN_SIZE)
^1da177e4c3f41 Linus Torvalds 2005-04-16 36 return NODE_SWIN_BASE(nasid, widget) + (xtalk_addr % SWIN_SIZE);
^1da177e4c3f41 Linus Torvalds 2005-04-16 37
^1da177e4c3f41 Linus Torvalds 2005-04-16 38 if ((xtalk_addr % BWIN_SIZE) + size > BWIN_SIZE) {
^1da177e4c3f41 Linus Torvalds 2005-04-16 39 printk(KERN_WARNING "PIO mapping at hub %d widget %d addr 0x%lx"
^1da177e4c3f41 Linus Torvalds 2005-04-16 40 " too big (%ld)\n",
^1da177e4c3f41 Linus Torvalds 2005-04-16 41 nasid, widget, xtalk_addr, size);
^1da177e4c3f41 Linus Torvalds 2005-04-16 42 return 0;
^1da177e4c3f41 Linus Torvalds 2005-04-16 43 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 44
^1da177e4c3f41 Linus Torvalds 2005-04-16 45 xtalk_addr &= ~(BWIN_SIZE-1);
^1da177e4c3f41 Linus Torvalds 2005-04-16 46 for (i = 0; i < HUB_NUM_BIG_WINDOW; i++) {
^1da177e4c3f41 Linus Torvalds 2005-04-16 47 if (test_and_set_bit(i, hub_data(cnode)->h_bigwin_used))
^1da177e4c3f41 Linus Torvalds 2005-04-16 48 continue;
^1da177e4c3f41 Linus Torvalds 2005-04-16 49
^1da177e4c3f41 Linus Torvalds 2005-04-16 50 /*
^1da177e4c3f41 Linus Torvalds 2005-04-16 51 * The code below does a PIO write to setup an ITTE entry.
^1da177e4c3f41 Linus Torvalds 2005-04-16 52 *
^1da177e4c3f41 Linus Torvalds 2005-04-16 53 * We need to prevent other CPUs from seeing our updated
^1da177e4c3f41 Linus Torvalds 2005-04-16 54 * memory shadow of the ITTE (in the piomap) until the ITTE
^1da177e4c3f41 Linus Torvalds 2005-04-16 55 * entry is actually set up; otherwise, another CPU might
^1da177e4c3f41 Linus Torvalds 2005-04-16 56 * attempt a PIO prematurely.
^1da177e4c3f41 Linus Torvalds 2005-04-16 57 *
^1da177e4c3f41 Linus Torvalds 2005-04-16 58 * Also, the only way we can know that an entry has been
^1da177e4c3f41 Linus Torvalds 2005-04-16 59 * received by the hub and can be used by future PIO reads/
^1da177e4c3f41 Linus Torvalds 2005-04-16 60 * writes is by reading back the ITTE entry after writing it.
^1da177e4c3f41 Linus Torvalds 2005-04-16 61 *
^1da177e4c3f41 Linus Torvalds 2005-04-16 62 * For these two reasons, we PIO read back the ITTE entry
^1da177e4c3f41 Linus Torvalds 2005-04-16 63 * after we write it.
^1da177e4c3f41 Linus Torvalds 2005-04-16 64 */
^1da177e4c3f41 Linus Torvalds 2005-04-16 65 IIO_ITTE_PUT(nasid, i, HUB_PIO_MAP_TO_MEM, widget, xtalk_addr);
e12f47ef1680d8 Ralf Baechle 2011-04-11 66 (void) HUB_L(IIO_ITTE_GET(nasid, i));
^1da177e4c3f41 Linus Torvalds 2005-04-16 67
^1da177e4c3f41 Linus Torvalds 2005-04-16 68 return NODE_BWIN_BASE(nasid, widget) + (xtalk_addr % BWIN_SIZE);
^1da177e4c3f41 Linus Torvalds 2005-04-16 69 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 70
^1da177e4c3f41 Linus Torvalds 2005-04-16 71 printk(KERN_WARNING "unable to establish PIO mapping for at"
^1da177e4c3f41 Linus Torvalds 2005-04-16 72 " hub %d widget %d addr 0x%lx\n",
^1da177e4c3f41 Linus Torvalds 2005-04-16 73 nasid, widget, xtalk_addr);
^1da177e4c3f41 Linus Torvalds 2005-04-16 74 return 0;
^1da177e4c3f41 Linus Torvalds 2005-04-16 75 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 76
:::::: The code at line 30 was first introduced by commit
:::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2
:::::: TO: Linus Torvalds <torvalds@...970.osdl.org>
:::::: CC: Linus Torvalds <torvalds@...970.osdl.org>
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