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Message-ID: <202601190420.RlBoZSGm-lkp@intel.com>
Date: Mon, 19 Jan 2026 05:04:27 +0800
From: kernel test robot <lkp@...el.com>
To: Eric Dumazet <edumazet@...gle.com>,
Andrew Morton <akpm@...ux-foundation.org>
Cc: oe-kbuild-all@...ts.linux.dev,
Linux Memory Management List <linux-mm@...ck.org>,
linux-kernel <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org,
Jakub Kicinski <kuba@...nel.org>,
Eric Dumazet <eric.dumazet@...il.com>,
Paolo Abeni <pabeni@...hat.com>,
Nicolas Pitre <npitre@...libre.com>
Subject: Re: [PATCH] compiler_types: Introduce inline_for_performance
Hi Eric,
kernel test robot noticed the following build warnings:
[auto build test WARNING on e84d960149e71e8d5e4db69775ce31305898ed0c]
url: https://github.com/intel-lab-lkp/linux/commits/Eric-Dumazet/compiler_types-Introduce-inline_for_performance/20260118-232653
base: e84d960149e71e8d5e4db69775ce31305898ed0c
patch link: https://lore.kernel.org/r/20260118152448.2560414-1-edumazet%40google.com
patch subject: [PATCH] compiler_types: Introduce inline_for_performance
config: arm-randconfig-004-20260119 (https://download.01.org/0day-ci/archive/20260119/202601190420.RlBoZSGm-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 14.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260119/202601190420.RlBoZSGm-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/202601190420.RlBoZSGm-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from include/linux/math.h:6,
from include/linux/kernel.h:27,
from include/linux/random.h:7,
from include/linux/nodemask.h:94,
from include/linux/numa.h:6,
from include/linux/cpumask.h:15,
from include/linux/smp.h:13,
from include/linux/lockdep.h:14,
from include/linux/spinlock.h:63,
from lib/dec_and_lock.c:3:
>> arch/arm/include/asm/div64.h:56:10: warning: '__arch_xprod_64' defined but not used [-Wunused-function]
56 | uint64_t __arch_xprod_64(uint64_t m, uint64_t n, bool bias)
| ^~~~~~~~~~~~~~~
vim +/__arch_xprod_64 +56 arch/arm/include/asm/div64.h
fa4adc614922c2 include/asm-arm/div64.h Nicolas Pitre 2006-12-06 54
5f712d70e20a46 arch/arm/include/asm/div64.h Eric Dumazet 2026-01-18 55 static inline_for_performance
d533cb2d2af400 arch/arm/include/asm/div64.h Nicolas Pitre 2024-10-03 @56 uint64_t __arch_xprod_64(uint64_t m, uint64_t n, bool bias)
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 57 {
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 58 unsigned long long res;
73e592f3bc2cdc arch/arm/include/asm/div64.h Nicolas Pitre 2016-01-27 59 register unsigned int tmp asm("ip") = 0;
06508533d51a1d arch/arm/include/asm/div64.h Nicolas Pitre 2024-10-03 60 bool no_ovf = __builtin_constant_p(m) &&
06508533d51a1d arch/arm/include/asm/div64.h Nicolas Pitre 2024-10-03 61 ((m >> 32) + (m & 0xffffffff) < 0x100000000);
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 62
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 63 if (!bias) {
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 64 asm ( "umull %Q0, %R0, %Q1, %Q2\n\t"
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 65 "mov %Q0, #0"
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 66 : "=&r" (res)
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 67 : "r" (m), "r" (n)
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 68 : "cc");
06508533d51a1d arch/arm/include/asm/div64.h Nicolas Pitre 2024-10-03 69 } else if (no_ovf) {
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 70 res = m;
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 71 asm ( "umlal %Q0, %R0, %Q1, %Q2\n\t"
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 72 "mov %Q0, #0"
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 73 : "+&r" (res)
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 74 : "r" (m), "r" (n)
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 75 : "cc");
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 76 } else {
73e592f3bc2cdc arch/arm/include/asm/div64.h Nicolas Pitre 2016-01-27 77 asm ( "umull %Q0, %R0, %Q2, %Q3\n\t"
73e592f3bc2cdc arch/arm/include/asm/div64.h Nicolas Pitre 2016-01-27 78 "cmn %Q0, %Q2\n\t"
73e592f3bc2cdc arch/arm/include/asm/div64.h Nicolas Pitre 2016-01-27 79 "adcs %R0, %R0, %R2\n\t"
73e592f3bc2cdc arch/arm/include/asm/div64.h Nicolas Pitre 2016-01-27 80 "adc %Q0, %1, #0"
73e592f3bc2cdc arch/arm/include/asm/div64.h Nicolas Pitre 2016-01-27 81 : "=&r" (res), "+&r" (tmp)
73e592f3bc2cdc arch/arm/include/asm/div64.h Nicolas Pitre 2016-01-27 82 : "r" (m), "r" (n)
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 83 : "cc");
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 84 }
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 85
06508533d51a1d arch/arm/include/asm/div64.h Nicolas Pitre 2024-10-03 86 if (no_ovf) {
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 87 asm ( "umlal %R0, %Q0, %R1, %Q2\n\t"
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 88 "umlal %R0, %Q0, %Q1, %R2\n\t"
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 89 "mov %R0, #0\n\t"
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 90 "umlal %Q0, %R0, %R1, %R2"
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 91 : "+&r" (res)
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 92 : "r" (m), "r" (n)
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 93 : "cc");
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 94 } else {
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 95 asm ( "umlal %R0, %Q0, %R2, %Q3\n\t"
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 96 "umlal %R0, %1, %Q2, %R3\n\t"
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 97 "mov %R0, #0\n\t"
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 98 "adds %Q0, %1, %Q0\n\t"
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 99 "adc %R0, %R0, #0\n\t"
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 100 "umlal %Q0, %R0, %R2, %R3"
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 101 : "+&r" (res), "+&r" (tmp)
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 102 : "r" (m), "r" (n)
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 103 : "cc");
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 104 }
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 105
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 106 return res;
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 107 }
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 108 #define __arch_xprod_64 __arch_xprod_64
040b323b5012b5 arch/arm/include/asm/div64.h Nicolas Pitre 2015-11-02 109
--
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