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: In function 'amd_ntb_mw_set_trans': drivers/ntb/hw/amd/ntb_hw_amd.c:189:6: warning: 'limit' may be used uninitialized in this function [-Wmaybe-uninitialized] if (reg_val != limit) { ^ drivers/ntb/hw/amd/ntb_hw_amd.c: In function 'amd_ntb_wakeup_peer_side': >> drivers/ntb/hw/amd/ntb_hw_amd.c:526:6: warning: 'reg' may be used >> uninitialized in this function [-Wmaybe-uninitialized] reg |= 0x1; ^ drivers/ntb/hw/amd/ntb_hw_amd.c:518:6: note: 'reg' was declared here u32 reg; ^ vim +/reg +526 drivers/ntb/hw/amd/ntb_hw_amd.c 58a6d117 Xiangliang Yu 2015-12-17 510 return amd_flush_peer_requests(ndev); 58a6d117 Xiangliang Yu 2015-12-17 511 } 58a6d117 Xiangliang Yu 2015-12-17 512 a635755a Xiangliang Yu 2015-12-17 513 /* a635755a Xiangliang Yu 2015-12-17 514 * wake up the peer side a635755a Xiangliang Yu 2015-12-17 515 */ a635755a Xiangliang Yu 2015-12-17 516 static int amd_wakeup_peer_side(struct amd_ntb_dev *ndev) a635755a Xiangliang Yu 2015-12-17 517 { a635755a Xiangliang Yu 2015-12-17 518 u32 reg; a635755a Xiangliang Yu 2015-12-17 519 a635755a Xiangliang Yu 2015-12-17 520 if (!amd_link_is_up(ndev)) { a635755a Xiangliang Yu 2015-12-17 521 dev_warn(ndev_dev(ndev), "link is down.\n"); a635755a Xiangliang Yu 2015-12-17 522 return -EINVAL; a635755a Xiangliang Yu 2015-12-17 523 } a635755a Xiangliang Yu 2015-12-17 524 a635755a Xiangliang Yu 2015-12-17 525 NTB_READ_REG(PMSGTRIG); a635755a Xiangliang Yu 2015-12-17 @526 reg |= 0x1; a635755a Xiangliang Yu 2015-12-17 527 NTB_WRITE_REG(reg, PMSGTRIG); a635755a Xiangliang Yu 2015-12-17 528 a635755a Xiangliang Yu 2015-12-17 529 wait_for_completion(&ndev->wakeup_cmpl); a635755a Xiangliang Yu 2015-12-17 530 a635755a Xiangliang Yu 2015-12-17 531 return 0; a635755a Xiangliang Yu 2015-12-17 532 } a635755a Xiangliang Yu 2015-12-17 533 58a6d117 Xiangliang Yu 2015-12-17 534 static int amd_ntb_wakeup_peer_side(struct ntb_dev *ntb) :::::: The code at line 526 was first introduced by commit :::::: a635755a710138a6f505cc7e62693741786fb19e NTB: Add AMD PCI-Express NTB driver :::::: TO: Xiangliang Yu <xiangliang...@amd.com> :::::: CC: 0day robot <fengguang...@intel.com> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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