[vincent.guittot:sched/pelt 1/2] kernel/sched/fair.c:4056:25: warning: comparison of distinct pointer types ('typeof (task_h_load(p)) (aka 'unsigned long and 'typeof (1) (aka 'int
8:09 p.m.
tree: https://git.linaro.org/people/vincent.guittot/kernel.git sched/pelt
head: cc807c0b8d03785da906a6a8436be5838bfe9d54
commit: a057128bc3087ebc9505454a1b5d7a4ae35c6e04 [1/2] sched/fair: handle case of
task_h_load() returning 0
config: s390-randconfig-r031-20200710 (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project
02946de3802d3bc65bc9f2eb9b8d4969b5a7add8)
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
# install s390 cross compiling tool for clang build
# apt-get install binutils-s390x-linux-gnu
git checkout a057128bc3087ebc9505454a1b5d7a4ae35c6e04
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=s390
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp(a)intel.com>
All warnings (new ones prefixed by >>):
include/asm-generic/io.h:490:45: warning: performing pointer arithmetic on a null
pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le32_to_cpu(__raw_readl(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro
'__le32_to_cpu'
#define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
^
include/uapi/linux/swab.h:119:21: note: expanded from macro '__swab32'
___constant_swab32(x) : \
^
include/uapi/linux/swab.h:20:12: note: expanded from macro
'___constant_swab32'
(((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \
^
In file included from kernel/sched/fair.c:23:
In file included from kernel/sched/sched.h:17:
In file included from include/linux/sched/isolation.h:6:
In file included from include/linux/tick.h:8:
In file included from include/linux/clockchips.h:14:
In file included from include/linux/clocksource.h:21:
In file included from arch/s390/include/asm/io.h:72:
include/asm-generic/io.h:490:45: warning: performing pointer arithmetic on a null
pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le32_to_cpu(__raw_readl(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro
'__le32_to_cpu'
#define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
^
include/uapi/linux/swab.h:119:21: note: expanded from macro '__swab32'
___constant_swab32(x) : \
^
include/uapi/linux/swab.h:21:12: note: expanded from macro
'___constant_swab32'
(((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \
^
In file included from kernel/sched/fair.c:23:
In file included from kernel/sched/sched.h:17:
In file included from include/linux/sched/isolation.h:6:
In file included from include/linux/tick.h:8:
In file included from include/linux/clockchips.h:14:
In file included from include/linux/clocksource.h:21:
In file included from arch/s390/include/asm/io.h:72:
include/asm-generic/io.h:490:45: warning: performing pointer arithmetic on a null
pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le32_to_cpu(__raw_readl(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro
'__le32_to_cpu'
#define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
^
include/uapi/linux/swab.h:119:21: note: expanded from macro '__swab32'
___constant_swab32(x) : \
^
include/uapi/linux/swab.h:22:12: note: expanded from macro
'___constant_swab32'
(((__u32)(x) & (__u32)0xff000000UL) >> 24)))
^
In file included from kernel/sched/fair.c:23:
In file included from kernel/sched/sched.h:17:
In file included from include/linux/sched/isolation.h:6:
In file included from include/linux/tick.h:8:
In file included from include/linux/clockchips.h:14:
In file included from include/linux/clocksource.h:21:
In file included from arch/s390/include/asm/io.h:72:
include/asm-generic/io.h:490:45: warning: performing pointer arithmetic on a null
pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le32_to_cpu(__raw_readl(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro
'__le32_to_cpu'
#define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
^
include/uapi/linux/swab.h:120:12: note: expanded from macro '__swab32'
__fswab32(x))
^
In file included from kernel/sched/fair.c:23:
In file included from kernel/sched/sched.h:17:
In file included from include/linux/sched/isolation.h:6:
In file included from include/linux/tick.h:8:
In file included from include/linux/clockchips.h:14:
In file included from include/linux/clocksource.h:21:
In file included from arch/s390/include/asm/io.h:72:
include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null
pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writeb(value, PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:511:46: warning: performing pointer arithmetic on a null
pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writew(cpu_to_le16(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:521:46: warning: performing pointer arithmetic on a null
pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writel(cpu_to_le32(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:609:20: warning: performing pointer arithmetic on a null
pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:617:20: warning: performing pointer arithmetic on a null
pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:625:20: warning: performing pointer arithmetic on a null
pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:634:21: warning: performing pointer arithmetic on a null
pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:643:21: warning: performing pointer arithmetic on a null
pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:652:21: warning: performing pointer arithmetic on a null
pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
> kernel/sched/fair.c:4056:25: warning: comparison of distinct
pointer types ('typeof (task_h_load(p)) *' (aka 'unsigned long *') and
'typeof (1) *' (aka 'int *')) [-Wcompare-distinct-pointer-types]
rq->misfit_task_load = max(task_h_load(p), 1);
^~~~~~~~~~~~~~~~~~~~~~
include/linux/kernel.h:891:19: note: expanded from macro 'max'
#define max(x, y) __careful_cmp(x, y, >)
^~~~~~~~~~~~~~~~~~~~~~
include/linux/kernel.h:875:24: note: expanded from macro '__careful_cmp'
__builtin_choose_expr(__safe_cmp(x, y), \
^~~~~~~~~~~~~~~~
include/linux/kernel.h:865:4: note: expanded from macro '__safe_cmp'
(__typecheck(x, y) && __no_side_effects(x, y))
^~~~~~~~~~~~~~~~~
include/linux/kernel.h:851:29: note: expanded from macro '__typecheck'
(!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~
kernel/sched/fair.c:7662:11: warning: comparison of distinct pointer types ('typeof
(task_h_load(p)) *' (aka 'unsigned long *') and 'typeof (1) *' (aka
'int *')) [-Wcompare-distinct-pointer-types]
load = max(task_h_load(p), 1);
^~~~~~~~~~~~~~~~~~~~~~
include/linux/kernel.h:891:19: note: expanded from macro 'max'
#define max(x, y) __careful_cmp(x, y, >)
^~~~~~~~~~~~~~~~~~~~~~
include/linux/kernel.h:875:24: note: expanded from macro '__careful_cmp'
__builtin_choose_expr(__safe_cmp(x, y), \
^~~~~~~~~~~~~~~~
include/linux/kernel.h:865:4: note: expanded from macro '__safe_cmp'
(__typecheck(x, y) && __no_side_effects(x, y))
^~~~~~~~~~~~~~~~~
include/linux/kernel.h:851:29: note: expanded from macro '__typecheck'
(!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~
kernel/sched/fair.c:8180:19: warning: unused function 'check_misfit_status'
[-Wunused-function]
static inline int check_misfit_status(struct rq *rq, struct sched_domain *sd)
^
23 warnings generated.
vim +4056 kernel/sched/fair.c
4036
4037 static inline void update_misfit_status(struct task_struct *p, struct rq *rq)
4038 {
4039 if (!static_branch_unlikely(&sched_asym_cpucapacity))
4040 return;
4041
4042 if (!p) {
4043 rq->misfit_task_load = 0;
4044 return;
4045 }
4046
4047 if (task_fits_capacity(p, capacity_of(cpu_of(rq)))) {
4048 rq->misfit_task_load = 0;
4049 return;
4050 }
4051
4052 /*
4053 * Make sure that misfit_task_load will not be null even if
4054 * task_h_load() returns 0.
4055 */
4056 rq->misfit_task_load = max(task_h_load(p), 1);
4057 }
4058
---
0-DAY CI Kernel Test Service, Intel Corporation
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