[arm:cex7 88/106] arch/sh/include/asm/io.h:32:43: warning: 'px_is' may be used uninitialized in this function

tree:   git://git.armlinux.org.uk/~rmk/linux-arm.git cex7
head:   96bd73e4644e76befe9ab998e070a679ae08388c
commit: 04d1ec3ed831580aadbdac12b36b6158ad80dad4 [88/106] ahci: qoriq: workaround for errata A-379364 on lx2160a
config: sh-allmodconfig (attached as .config)
compiler: sh4-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 04d1ec3ed831580aadbdac12b36b6158ad80dad4
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=sh 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <redacted>

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 >>, old ones prefixed by <<):

In file included from drivers/ata/ahci_qoriq.c:19:
drivers/ata/ahci.h:384:16: warning: initialized field overwritten [-Woverride-init]
384 |  .can_queue  = AHCI_MAX_CMDS,            |                ^~~~~~~~~~~~~
drivers/ata/ahci_qoriq.c:304:2: note: in expansion of macro 'AHCI_SHT'
304 |  AHCI_SHT(DRV_NAME),
|  ^~~~~~~~
drivers/ata/ahci.h:384:16: note: (near initialization for 'ahci_qoriq_sht.can_queue')
384 |  .can_queue  = AHCI_MAX_CMDS,            |                ^~~~~~~~~~~~~
drivers/ata/ahci_qoriq.c:304:2: note: in expansion of macro 'AHCI_SHT'
304 |  AHCI_SHT(DRV_NAME),
|  ^~~~~~~~
drivers/ata/ahci.h:388:17: warning: initialized field overwritten [-Woverride-init]
388 |  .sdev_attrs  = ahci_sdev_attrs
|                 ^~~~~~~~~~~~~~~
drivers/ata/ahci_qoriq.c:304:2: note: in expansion of macro 'AHCI_SHT'
304 |  AHCI_SHT(DRV_NAME),
|  ^~~~~~~~
drivers/ata/ahci.h:388:17: note: (near initialization for 'ahci_qoriq_sht.sdev_attrs')
388 |  .sdev_attrs  = ahci_sdev_attrs
|                 ^~~~~~~~~~~~~~~
drivers/ata/ahci_qoriq.c:304:2: note: in expansion of macro 'AHCI_SHT'
304 |  AHCI_SHT(DRV_NAME),
|  ^~~~~~~~
In file included from include/linux/io.h:13,
from include/linux/of_address.h:7,
from drivers/ata/ahci_qoriq.c:14:
drivers/ata/ahci_qoriq.c: In function 'ahci_qoriq_hardreset':

quoted

arch/sh/include/asm/io.h:32:43: warning: 'px_is' may be used uninitialized in this function [-Wmaybe-uninitialized]

32 | #define __raw_writel(v,a) (__chk_io_ptr(a), *(volatile u32 __force *)(a) = (v))
|                                           ^
drivers/ata/ahci_qoriq.c:229:14: note: 'px_is' was declared here
229 |  u32 px_cmd, px_is, px_val;
|              ^~~~~
In file included from include/linux/io.h:13,
from include/linux/of_address.h:7,
from drivers/ata/ahci_qoriq.c:14:

quoted

arch/sh/include/asm/io.h:32:43: warning: 'px_cmd' may be used uninitialized in this function [-Wmaybe-uninitialized]

32 | #define __raw_writel(v,a) (__chk_io_ptr(a), *(volatile u32 __force *)(a) = (v))
|                                           ^
drivers/ata/ahci_qoriq.c:229:6: note: 'px_cmd' was declared here
229 |  u32 px_cmd, px_is, px_val;
|      ^~~~~~

vim +/px_is +32 arch/sh/include/asm/io.h

b66c1a3919abb4 include/asm-sh/io.h      Paul Mundt 2006-01-16  29  
14866543ad2201 arch/sh/include/asm/io.h Paul Mundt 2008-10-04  30  #define __raw_writeb(v,a)	(__chk_io_ptr(a), *(volatile u8  __force *)(a) = (v))
14866543ad2201 arch/sh/include/asm/io.h Paul Mundt 2008-10-04  31  #define __raw_writew(v,a)	(__chk_io_ptr(a), *(volatile u16 __force *)(a) = (v))
14866543ad2201 arch/sh/include/asm/io.h Paul Mundt 2008-10-04 @32  #define __raw_writel(v,a)	(__chk_io_ptr(a), *(volatile u32 __force *)(a) = (v))
14866543ad2201 arch/sh/include/asm/io.h Paul Mundt 2008-10-04  33  #define __raw_writeq(v,a)	(__chk_io_ptr(a), *(volatile u64 __force *)(a) = (v))
14866543ad2201 arch/sh/include/asm/io.h Paul Mundt 2008-10-04  34  

:::::: The code at line 32 was first introduced by commit
:::::: 14866543ad22014a0b12e10657a917eb6b487248 sh: More I/O routine overhauling.

:::::: TO: Paul Mundt [off-list ref]
:::::: CC: Paul Mundt [off-list ref]

---
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