Hi Xiangliang, [auto build test WARNING on v4.4-rc5] [also build test WARNING on next-20151217]
url: https://github.com/0day-ci/linux/commits/Xiangliang-Yu/NTB-Add-AMD-PCI-Express-NTB-driver/20151217-113608 config: x86_64-randconfig-n0-12171710 (attached as .config) reproduce: # save the attached .config to linux build tree make ARCH=x86_64 Note: it may well be a FALSE warning. FWIW you are at least aware of it now. http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings All warnings (new ones prefixed by >>): drivers/ntb/hw/amd/ntb_hw_amd.c:486:12: warning: 'amd_flush_peer_requests' defined but not used [-Wunused-function] static int amd_flush_peer_requests(struct amd_ntb_dev *ndev) ^ drivers/ntb/hw/amd/ntb_hw_amd.c:507:12: warning: 'amd_wakeup_peer_side' defined but not used [-Wunused-function] static int amd_wakeup_peer_side(struct amd_ntb_dev *ndev) ^ drivers/ntb/hw/amd/ntb_hw_amd.c: In function 'amd_ntb_mw_set_trans': >> drivers/ntb/hw/amd/ntb_hw_amd.c:187:6: warning: 'limit' may be used >> uninitialized in this function [-Wmaybe-uninitialized] if (reg_val != limit) { ^ vim +/limit +187 drivers/ntb/hw/amd/ntb_hw_amd.c a635755a Xiangliang Yu 2015-12-17 171 if (bar != 1) { a635755a Xiangliang Yu 2015-12-17 172 /* Set the limit if supported */ a635755a Xiangliang Yu 2015-12-17 173 if (limit_reg) a635755a Xiangliang Yu 2015-12-17 174 limit = base_addr + size; a635755a Xiangliang Yu 2015-12-17 175 a635755a Xiangliang Yu 2015-12-17 176 /* set and verify setting the translation address */ a635755a Xiangliang Yu 2015-12-17 177 iowrite64(addr, peer_mmio + xlat_reg); a635755a Xiangliang Yu 2015-12-17 178 reg_val = ioread64(peer_mmio + xlat_reg); a635755a Xiangliang Yu 2015-12-17 179 if (reg_val != addr) { a635755a Xiangliang Yu 2015-12-17 180 iowrite64(0, peer_mmio + xlat_reg); a635755a Xiangliang Yu 2015-12-17 181 return -EIO; a635755a Xiangliang Yu 2015-12-17 182 } a635755a Xiangliang Yu 2015-12-17 183 a635755a Xiangliang Yu 2015-12-17 184 /* set and verify setting the limit */ a635755a Xiangliang Yu 2015-12-17 185 iowrite64(limit, mmio + limit_reg); a635755a Xiangliang Yu 2015-12-17 186 reg_val = ioread64(mmio + limit_reg); a635755a Xiangliang Yu 2015-12-17 @187 if (reg_val != limit) { a635755a Xiangliang Yu 2015-12-17 188 iowrite64(base_addr, mmio + limit_reg); a635755a Xiangliang Yu 2015-12-17 189 iowrite64(0, peer_mmio + xlat_reg); a635755a Xiangliang Yu 2015-12-17 190 return -EIO; a635755a Xiangliang Yu 2015-12-17 191 } a635755a Xiangliang Yu 2015-12-17 192 } else { a635755a Xiangliang Yu 2015-12-17 193 /* split bar addr range must all be 32 bit */ a635755a Xiangliang Yu 2015-12-17 194 if (addr & (~0ull << 32)) a635755a Xiangliang Yu 2015-12-17 195 return -EINVAL; :::::: The code at line 187 was first introduced by commit :::::: a635755a710138a6f505cc7e62693741786fb19e NTB: Add AMD PCI-Express NTB driver :::::: TO: Xiangliang Yu <[email protected]> :::::: CC: 0day robot <[email protected]> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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