[xlnx:xlnx_rebase_v5.4 1102/1697] arch/xtensa/include/uapi/asm/swab.h:24:5: warning: 'pmap' may be used uninitialized in this function
kernel test robot
lkp at intel.com
Tue Jan 12 13:11:55 EST 2021
tree: https://github.com/Xilinx/linux-xlnx xlnx_rebase_v5.4
head: 629150468791671b5fde21363e643e87c5815b17
commit: bbcf6f9bb1bc206330ca4d423e5a3966d8d82110 [1102/1697] net: xilinx: Add support for PL TSN IP features
config: xtensa-allyesconfig (attached as .config)
compiler: xtensa-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
# https://github.com/Xilinx/linux-xlnx/commit/bbcf6f9bb1bc206330ca4d423e5a3966d8d82110
git remote add xlnx https://github.com/Xilinx/linux-xlnx
git fetch --no-tags xlnx xlnx_rebase_v5.4
git checkout bbcf6f9bb1bc206330ca4d423e5a3966d8d82110
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=xtensa
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp at intel.com>
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 >>):
In file included from include/linux/kernel.h:11,
from include/linux/list.h:9,
from include/linux/timer.h:5,
from include/linux/netdevice.h:24,
from drivers/net/ethernet/xilinx/xilinx_axienet.h:12,
from drivers/net/ethernet/xilinx/xilinx_tsn_switch.h:21,
from drivers/net/ethernet/xilinx/xilinx_tsn_switch.c:18:
include/linux/scatterlist.h: In function 'sg_set_buf':
arch/xtensa/include/asm/page.h:182:9: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
182 | ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
| ^~
include/linux/compiler.h:78:42: note: in definition of macro 'unlikely'
78 | # define unlikely(x) __builtin_expect(!!(x), 0)
| ^
include/linux/scatterlist.h:143:2: note: in expansion of macro 'BUG_ON'
143 | BUG_ON(!virt_addr_valid(buf));
| ^~~~~~
arch/xtensa/include/asm/page.h:190:32: note: in expansion of macro 'pfn_valid'
190 | #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
| ^~~~~~~~~
include/linux/scatterlist.h:143:10: note: in expansion of macro 'virt_addr_valid'
143 | BUG_ON(!virt_addr_valid(buf));
| ^~~~~~~~~~~~~~~
In file included from ./arch/xtensa/include/generated/asm/bug.h:1,
from include/linux/bug.h:5,
from include/linux/thread_info.h:12,
from include/asm-generic/preempt.h:5,
from ./arch/xtensa/include/generated/asm/preempt.h:1,
from include/linux/preempt.h:78,
from include/linux/spinlock.h:51,
from include/linux/seqlock.h:36,
from include/linux/time.h:6,
from include/linux/ktime.h:24,
from include/linux/timer.h:6,
from include/linux/netdevice.h:24,
from drivers/net/ethernet/xilinx/xilinx_axienet.h:12,
from drivers/net/ethernet/xilinx/xilinx_tsn_switch.h:21,
from drivers/net/ethernet/xilinx/xilinx_tsn_switch.c:18:
include/linux/dma-mapping.h: In function 'dma_map_resource':
arch/xtensa/include/asm/page.h:182:9: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
182 | ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
| ^~
include/asm-generic/bug.h:139:27: note: in definition of macro 'WARN_ON_ONCE'
139 | int __ret_warn_once = !!(condition); \
| ^~~~~~~~~
include/linux/dma-mapping.h:355:19: note: in expansion of macro 'pfn_valid'
355 | if (WARN_ON_ONCE(pfn_valid(PHYS_PFN(phys_addr))))
| ^~~~~~~~~
In file included from include/uapi/linux/swab.h:7,
from include/linux/swab.h:5,
from include/uapi/linux/byteorder/big_endian.h:13,
from include/linux/byteorder/big_endian.h:5,
from arch/xtensa/include/uapi/asm/byteorder.h:8,
from arch/xtensa/include/asm/bitops.h:21,
from include/linux/bitops.h:26,
from include/linux/kernel.h:12,
from include/linux/list.h:9,
from include/linux/timer.h:5,
from include/linux/netdevice.h:24,
from drivers/net/ethernet/xilinx/xilinx_axienet.h:12,
from drivers/net/ethernet/xilinx/xilinx_tsn_switch.h:21,
from drivers/net/ethernet/xilinx/xilinx_tsn_switch.c:18:
drivers/net/ethernet/xilinx/xilinx_tsn_switch.c: In function 'tsnswitch_probe':
>> arch/xtensa/include/uapi/asm/swab.h:24:5: warning: 'pmap' may be used uninitialized in this function [-Wmaybe-uninitialized]
24 | __asm__("ssai 8 \n\t"
| ^~~~~~~
drivers/net/ethernet/xilinx/xilinx_tsn_switch.c:580:6: note: 'pmap' was declared here
580 | u32 pmap;
| ^~~~
vim +/pmap +24 arch/xtensa/include/uapi/asm/swab.h
8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 19
8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 20 static inline __attribute_const__ __u32 __arch_swab32(__u32 x)
8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 21 {
8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 22 __u32 res;
8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 23 /* instruction sequence from Xtensa ISA release 2/2000 */
8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 @24 __asm__("ssai 8 \n\t"
8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 25 "srli %0, %1, 16 \n\t"
8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 26 "src %0, %0, %1 \n\t"
8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 27 "src %0, %0, %0 \n\t"
8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 28 "src %0, %1, %0 \n"
8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 29 : "=&a" (res)
8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 30 : "a" (x)
8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 31 );
8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 32 return res;
8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 33 }
8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 34 #define __arch_swab32 __arch_swab32
8903709b054a8d arch/xtensa/include/asm/swab.h Harvey Harrison 2009-01-07 35
:::::: The code at line 24 was first introduced by commit
:::::: 8903709b054a8dafe4e8c6d9a6444034d7aba36f xtensa: introduce swab.h
:::::: TO: Harvey Harrison <harvey.harrison at gmail.com>
:::::: CC: Linus Torvalds <torvalds at linux-foundation.org>
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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