[PATCH 1/3] ata: add Palmchip BK3710 PATA controller driver

kbuild test robot
2017-03-11T05:07:10Z

Hi Bartlomiej,

[auto build test WARNING on tj-libata/for-next]
[also build test WARNING on v4.11-rc1 next-20170310]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Bartlomiej-Zolnierkiewicz/ata-add-Palmchip-BK3710-PATA-controller-driver/20170311-095152
base: https://git.kernel.org/pub/scm/linux/kernel/git/tj/libata.git for-next
config: arm-davinci_all_defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
make.cross ARCH=arm

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/ata/pata_bk3710.c: In function 'pata_bk3710_set_piomode':
>> drivers/ata/pata_bk3710.c:223:5: warning: 'cycle_time' may be used uninitialized in this function [-Wmaybe-uninitialized]
if (!cycle_time)
^

vim +/cycle_time +223 drivers/ata/pata_bk3710.c

207 const u16 *id = adev->id;
208 unsigned int cycle_time;
209 int is_slave = adev->devno;
210 const u8 pio = adev->pio_mode - XFER_PIO_0;
211
212 if (id[ATA_ID_FIELD_VALID] & 2) {
213 if (ata_id_has_iordy(id))
214 cycle_time = id[ATA_ID_EIDE_PIO_IORDY];
215 else
216 cycle_time = id[ATA_ID_EIDE_PIO];
217
218 /* conservative "downgrade" for all pre-ATA2 drives */
219 if (pio < 3 && cycle_time < t->cycle)
220 cycle_time = 0; /* use standard timing */
221 }
222
> 223 if (!cycle_time)
224 cycle_time = t->cycle;
225
226 pata_bk3710_setpiomode(base, pair, is_slave, cycle_time, pio);
227 }
228
229 static void pata_bk3710_chipinit(void __iomem *base)
230 {
231 /*

---
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