[xlnx:xlnx_rebase_v5.4 1102/1697] include/uapi/linux/swab.h:20:38: warning: 'pmap' may be used uninitialized in this function
kernel test robot
lkp at intel.com
Tue Jan 12 13:14:55 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: h8300-allyesconfig (attached as .config)
compiler: h8300-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=h8300
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':
include/asm-generic/page.h:93:50: warning: ordered comparison of pointer with null pointer [-Wextra]
93 | #define virt_addr_valid(kaddr) (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \
| ^~
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));
| ^~~~~~
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/h8300/include/asm/bug.h:8,
from include/linux/bug.h:5,
from include/linux/thread_info.h:12,
from include/asm-generic/preempt.h:5,
from ./arch/h8300/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':
include/asm-generic/page.h:91:32: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
91 | #define pfn_valid(pfn) ((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/linux/swab.h:5,
from include/uapi/linux/byteorder/big_endian.h:13,
from include/linux/byteorder/big_endian.h:5,
from arch/h8300/include/asm/byteorder.h:5,
from include/asm-generic/bitops/le.h:6,
from arch/h8300/include/asm/bitops.h:171,
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':
>> include/uapi/linux/swab.h:20:38: warning: 'pmap' may be used uninitialized in this function [-Wmaybe-uninitialized]
20 | (((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \
| ^~
drivers/net/ethernet/xilinx/xilinx_tsn_switch.c:580:6: note: 'pmap' was declared here
580 | u32 pmap;
| ^~~~
vim +/pmap +20 include/uapi/linux/swab.h
607ca46e97a1b659 David Howells 2012-10-13 8
607ca46e97a1b659 David Howells 2012-10-13 9 /*
607ca46e97a1b659 David Howells 2012-10-13 10 * casts are necessary for constants, because we never know how for sure
607ca46e97a1b659 David Howells 2012-10-13 11 * how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way.
607ca46e97a1b659 David Howells 2012-10-13 12 */
607ca46e97a1b659 David Howells 2012-10-13 13 #define ___constant_swab16(x) ((__u16)( \
607ca46e97a1b659 David Howells 2012-10-13 14 (((__u16)(x) & (__u16)0x00ffU) << 8) | \
607ca46e97a1b659 David Howells 2012-10-13 15 (((__u16)(x) & (__u16)0xff00U) >> 8)))
607ca46e97a1b659 David Howells 2012-10-13 16
607ca46e97a1b659 David Howells 2012-10-13 17 #define ___constant_swab32(x) ((__u32)( \
607ca46e97a1b659 David Howells 2012-10-13 18 (((__u32)(x) & (__u32)0x000000ffUL) << 24) | \
607ca46e97a1b659 David Howells 2012-10-13 19 (((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \
607ca46e97a1b659 David Howells 2012-10-13 @20 (((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \
607ca46e97a1b659 David Howells 2012-10-13 21 (((__u32)(x) & (__u32)0xff000000UL) >> 24)))
607ca46e97a1b659 David Howells 2012-10-13 22
:::::: The code at line 20 was first introduced by commit
:::::: 607ca46e97a1b6594b29647d98a32d545c24bdff UAPI: (Scripted) Disintegrate include/linux
:::::: TO: David Howells <dhowells at redhat.com>
:::::: CC: David Howells <dhowells at redhat.com>
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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