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Message-ID: <202411121722.Oxq727h0-lkp@intel.com>
Date: Tue, 12 Nov 2024 17:36:44 +0800
From: kernel test robot <lkp@...el.com>
To: John Ousterhout <ouster@...stanford.edu>, netdev@...r.kernel.org,
linux-api@...r.kernel.org
Cc: oe-kbuild-all@...ts.linux.dev, John Ousterhout <ouster@...stanford.edu>
Subject: Re: [PATCH net-next v2 12/12] net: homa: create Makefile and Kconfig
Hi John,
kernel test robot noticed the following build warnings:
[auto build test WARNING on net-next/main]
url: https://github.com/intel-lab-lkp/linux/commits/John-Ousterhout/net-homa-define-user-visible-API-for-Homa/20241112-074535
base: net-next/main
patch link: https://lore.kernel.org/r/20241111234006.5942-13-ouster%40cs.stanford.edu
patch subject: [PATCH net-next v2 12/12] net: homa: create Makefile and Kconfig
config: mips-allyesconfig (https://download.01.org/0day-ci/archive/20241112/202411121722.Oxq727h0-lkp@intel.com/config)
compiler: mips-linux-gcc (GCC) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241112/202411121722.Oxq727h0-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202411121722.Oxq727h0-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from arch/mips/include/asm/div64.h:89,
from include/linux/math.h:6,
from include/linux/kernel.h:27,
from include/linux/cpumask.h:11,
from arch/mips/include/asm/processor.h:15,
from arch/mips/include/asm/thread_info.h:16,
from include/linux/thread_info.h:60,
from include/asm-generic/current.h:6,
from ./arch/mips/include/generated/asm/current.h:1,
from include/linux/sched.h:12,
from include/linux/audit.h:12,
from net/homa/homa_impl.h:12,
from net/homa/homa_outgoing.c:7:
net/homa/homa_outgoing.c: In function 'homa_new_data_packet':
>> include/asm-generic/div64.h:222:35: warning: comparison of distinct pointer types lacks a cast [-Wcompare-distinct-pointer-types]
222 | (void)(((typeof((n)) *)0) == ((uint64_t *)0)); \
| ^~
net/homa/homa_outgoing.c:108:9: note: in expansion of macro 'do_div'
108 | do_div(segs, max_seg_data);
| ^~~~~~
In file included from arch/mips/include/asm/bug.h:5,
from include/linux/bug.h:5,
from net/homa/homa_impl.h:10:
>> include/asm-generic/div64.h:234:32: warning: right shift count >= width of type [-Wshift-count-overflow]
234 | } else if (likely(((n) >> 32) == 0)) { \
| ^~
include/linux/compiler.h:76:45: note: in definition of macro 'likely'
76 | # define likely(x) __builtin_expect(!!(x), 1)
| ^
net/homa/homa_outgoing.c:108:9: note: in expansion of macro 'do_div'
108 | do_div(segs, max_seg_data);
| ^~~~~~
net/homa/homa_outgoing.c: In function 'homa_message_out_fill':
>> include/asm-generic/div64.h:222:35: warning: comparison of distinct pointer types lacks a cast [-Wcompare-distinct-pointer-types]
222 | (void)(((typeof((n)) *)0) == ((uint64_t *)0)); \
| ^~
net/homa/homa_outgoing.c:233:9: note: in expansion of macro 'do_div'
233 | do_div(segs_per_gso, max_seg_data);
| ^~~~~~
>> include/asm-generic/div64.h:234:32: warning: right shift count >= width of type [-Wshift-count-overflow]
234 | } else if (likely(((n) >> 32) == 0)) { \
| ^~
include/linux/compiler.h:76:45: note: in definition of macro 'likely'
76 | # define likely(x) __builtin_expect(!!(x), 1)
| ^
net/homa/homa_outgoing.c:233:9: note: in expansion of macro 'do_div'
233 | do_div(segs_per_gso, max_seg_data);
| ^~~~~~
vim +222 include/asm-generic/div64.h
^1da177e4c3f41 Linus Torvalds 2005-04-16 215
^1da177e4c3f41 Linus Torvalds 2005-04-16 216 /* The unnecessary pointer compare is there
^1da177e4c3f41 Linus Torvalds 2005-04-16 217 * to check for type safety (n must be 64bit)
^1da177e4c3f41 Linus Torvalds 2005-04-16 218 */
^1da177e4c3f41 Linus Torvalds 2005-04-16 219 # define do_div(n,base) ({ \
^1da177e4c3f41 Linus Torvalds 2005-04-16 220 uint32_t __base = (base); \
^1da177e4c3f41 Linus Torvalds 2005-04-16 221 uint32_t __rem; \
^1da177e4c3f41 Linus Torvalds 2005-04-16 @222 (void)(((typeof((n)) *)0) == ((uint64_t *)0)); \
911918aa7ef6f8 Nicolas Pitre 2015-11-02 223 if (__builtin_constant_p(__base) && \
911918aa7ef6f8 Nicolas Pitre 2015-11-02 224 is_power_of_2(__base)) { \
911918aa7ef6f8 Nicolas Pitre 2015-11-02 225 __rem = (n) & (__base - 1); \
911918aa7ef6f8 Nicolas Pitre 2015-11-02 226 (n) >>= ilog2(__base); \
c747ce4706190e Geert Uytterhoeven 2021-08-11 227 } else if (__builtin_constant_p(__base) && \
461a5e51060c93 Nicolas Pitre 2015-10-30 228 __base != 0) { \
461a5e51060c93 Nicolas Pitre 2015-10-30 229 uint32_t __res_lo, __n_lo = (n); \
461a5e51060c93 Nicolas Pitre 2015-10-30 230 (n) = __div64_const32(n, __base); \
461a5e51060c93 Nicolas Pitre 2015-10-30 231 /* the remainder can be computed with 32-bit regs */ \
461a5e51060c93 Nicolas Pitre 2015-10-30 232 __res_lo = (n); \
461a5e51060c93 Nicolas Pitre 2015-10-30 233 __rem = __n_lo - __res_lo * __base; \
911918aa7ef6f8 Nicolas Pitre 2015-11-02 @234 } else if (likely(((n) >> 32) == 0)) { \
^1da177e4c3f41 Linus Torvalds 2005-04-16 235 __rem = (uint32_t)(n) % __base; \
^1da177e4c3f41 Linus Torvalds 2005-04-16 236 (n) = (uint32_t)(n) / __base; \
c747ce4706190e Geert Uytterhoeven 2021-08-11 237 } else { \
^1da177e4c3f41 Linus Torvalds 2005-04-16 238 __rem = __div64_32(&(n), __base); \
c747ce4706190e Geert Uytterhoeven 2021-08-11 239 } \
^1da177e4c3f41 Linus Torvalds 2005-04-16 240 __rem; \
^1da177e4c3f41 Linus Torvalds 2005-04-16 241 })
^1da177e4c3f41 Linus Torvalds 2005-04-16 242
--
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https://github.com/intel/lkp-tests/wiki
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