From: kernel test robot <lkp@intel.com>
To: Eric Dumazet <edumazet@google.com>
Cc: oe-kbuild-all@lists.linux.dev, linux-kernel@vger.kernel.org,
x86@kernel.org, Thomas Gleixner <tglx@kernel.org>
Subject: [tip:timers/urgent 1/1] include/linux/jiffies.h:470:36: sparse: sparse: cast truncates bits from constant value (7fffffffffff0bdc becomes ffff0bdc)
Date: Wed, 22 Apr 2026 03:56:14 +0800 [thread overview]
Message-ID: <202604220307.zk9Kn0Gi-lkp@intel.com> (raw)
tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers/urgent
head: 4096fd0e8eaea13ebe5206700b33f49635ae18e5
commit: b777b5e09eabeefc6ba80f4296366a4742701103 [1/1] time/jiffies: Inline jiffies_to_msecs() and jiffies_to_usecs()
config: alpha-randconfig-r121-20260421 (https://download.01.org/0day-ci/archive/20260422/202604220307.zk9Kn0Gi-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 15.2.0
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260422/202604220307.zk9Kn0Gi-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202604220307.zk9Kn0Gi-lkp@intel.com/
sparse warnings: (new ones prefixed by >>)
drivers/firewire/core-card.c: note: in included file (through include/linux/ktime.h, include/linux/timer.h, include/linux/uprobes.h, ...):
>> include/linux/jiffies.h:470:36: sparse: sparse: cast truncates bits from constant value (7fffffffffff0bdc becomes ffff0bdc)
--
drivers/firewire/core-transaction.c: note: in included file (through include/linux/ktime.h, include/linux/timer.h, include/linux/uprobes.h, ...):
>> include/linux/jiffies.h:470:36: sparse: sparse: cast truncates bits from constant value (7fffffffffff0bdc becomes ffff0bdc)
vim +470 include/linux/jiffies.h
454
455 #if !(USEC_PER_SEC % HZ)
456 /**
457 * jiffies_to_usecs - Convert jiffies to microseconds
458 * @j: jiffies value
459 *
460 * Return: microseconds value
461 */
462 static inline unsigned int jiffies_to_usecs(const unsigned long j)
463 {
464 /*
465 * Hz usually doesn't go much further MSEC_PER_SEC.
466 * jiffies_to_usecs() and usecs_to_jiffies() depend on that.
467 */
468 BUILD_BUG_ON(HZ > USEC_PER_SEC);
469
> 470 return (USEC_PER_SEC / HZ) * j;
471 }
472 #else
473 unsigned int jiffies_to_usecs(const unsigned long j);
474 #endif
475
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
reply other threads:[~2026-04-21 19:56 UTC|newest]
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