Re: [PATCH] x86/acpi: remove unused ACPI_FLUSH_CPU_CACHE macro
From: kernel test robot
Date: Sun Jun 14 2026 - 19:51:12 EST
Hi Ashwin,
kernel test robot noticed the following build warnings:
[auto build test WARNING on tip/master]
[also build test WARNING on tip/auto-latest tip/x86/core linus/master v7.1 next-20260612]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Ashwin-Gundarapu/x86-acpi-remove-unused-ACPI_FLUSH_CPU_CACHE-macro/20260614-224607
base: tip/master
patch link: https://lore.kernel.org/r/19ec69410f9.1df26e0036083.1465238188751484552%40zohomail.in
patch subject: [PATCH] x86/acpi: remove unused ACPI_FLUSH_CPU_CACHE macro
config: x86_64-randconfig-011-20260615 (https://download.01.org/0day-ci/archive/20260615/202606150752.I0Au8al5-lkp@xxxxxxxxx/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260615/202606150752.I0Au8al5-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202606150752.I0Au8al5-lkp@xxxxxxxxx/
All warnings (new ones prefixed by >>):
drivers/acpi/processor_idle.c: In function 'acpi_idle_enter':
>> drivers/acpi/processor_idle.c:699:39: warning: suggest braces around empty body in an 'if' statement [-Wempty-body]
699 | ACPI_FLUSH_CPU_CACHE();
| ^
vim +/if +699 drivers/acpi/processor_idle.c
6491bc0c616969 Rafael J. Wysocki 2015-02-03 676
409dfdcaffb266 Guilherme G. Piccoli 2022-06-07 677 static int __cpuidle acpi_idle_enter(struct cpuidle_device *dev,
6491bc0c616969 Rafael J. Wysocki 2015-02-03 678 struct cpuidle_driver *drv, int index)
6491bc0c616969 Rafael J. Wysocki 2015-02-03 679 {
6491bc0c616969 Rafael J. Wysocki 2015-02-03 680 struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu);
6491bc0c616969 Rafael J. Wysocki 2015-02-03 681 struct acpi_processor *pr;
6491bc0c616969 Rafael J. Wysocki 2015-02-03 682
6491bc0c616969 Rafael J. Wysocki 2015-02-03 683 pr = __this_cpu_read(processors);
6491bc0c616969 Rafael J. Wysocki 2015-02-03 684 if (unlikely(!pr))
6491bc0c616969 Rafael J. Wysocki 2015-02-03 685 return -EINVAL;
6491bc0c616969 Rafael J. Wysocki 2015-02-03 686
6491bc0c616969 Rafael J. Wysocki 2015-02-03 687 if (cx->type != ACPI_STATE_C1) {
1fecfdbb7acc66 Peter Zijlstra 2020-09-15 688 if (cx->type == ACPI_STATE_C3 && pr->flags.bm_check)
1fecfdbb7acc66 Peter Zijlstra 2020-09-15 689 return acpi_idle_enter_bm(drv, pr, cx, index);
1fecfdbb7acc66 Peter Zijlstra 2020-09-15 690
1fecfdbb7acc66 Peter Zijlstra 2020-09-15 691 /* C2 to C1 demotion. */
5f5081852038d9 Rafael J. Wysocki 2015-02-11 692 if (acpi_idle_fallback_to_c1(pr) && num_online_cpus() > 1) {
dc2251bf98c66d Rafael J. Wysocki 2017-08-23 693 index = ACPI_IDLE_STATE_START;
6491bc0c616969 Rafael J. Wysocki 2015-02-03 694 cx = per_cpu(acpi_cstate[index], dev->cpu);
6491bc0c616969 Rafael J. Wysocki 2015-02-03 695 }
6491bc0c616969 Rafael J. Wysocki 2015-02-03 696 }
6491bc0c616969 Rafael J. Wysocki 2015-02-03 697
6491bc0c616969 Rafael J. Wysocki 2015-02-03 698 if (cx->type == ACPI_STATE_C3)
6491bc0c616969 Rafael J. Wysocki 2015-02-03 @699 ACPI_FLUSH_CPU_CACHE();
6491bc0c616969 Rafael J. Wysocki 2015-02-03 700
6491bc0c616969 Rafael J. Wysocki 2015-02-03 701 acpi_idle_do_entry(cx);
6491bc0c616969 Rafael J. Wysocki 2015-02-03 702
e978aa7d7d57d0 Deepthi Dharwar 2011-10-28 703 return index;
4f86d3a8e29720 Len Brown 2007-10-03 704 }
4f86d3a8e29720 Len Brown 2007-10-03 705
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