Re: [PATCH v2 1/3] entry: move exit to usermode functions to header file
From: kernel test robot
Date: Mon Dec 18 2023 - 13:33:00 EST
Hi Sven,
kernel test robot noticed the following build warnings:
[auto build test WARNING on tip/core/entry]
[also build test WARNING on linus/master v6.7-rc6 next-20231218]
[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/Sven-Schnelle/entry-move-exit-to-usermode-functions-to-header-file/20231218-154733
base: tip/core/entry
patch link: https://lore.kernel.org/r/20231218074520.1998026-2-svens%40linux.ibm.com
patch subject: [PATCH v2 1/3] entry: move exit to usermode functions to header file
config: x86_64-randconfig-161-20231218 (https://download.01.org/0day-ci/archive/20231219/202312190205.LbtmWWZN-lkp@xxxxxxxxx/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231219/202312190205.LbtmWWZN-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/202312190205.LbtmWWZN-lkp@xxxxxxxxx/
All warnings (new ones prefixed by >>):
>> kernel/entry/common.c:134: warning: Function parameter or member 'regs' not described in 'exit_to_user_mode_loop'
>> kernel/entry/common.c:134: warning: Function parameter or member 'ti_work' not described in 'exit_to_user_mode_loop'
vim +134 kernel/entry/common.c
a9f3a74a29af09 Thomas Gleixner 2020-07-22 128
af18f155cb4bda Sven Schnelle 2023-12-18 129 /**
af18f155cb4bda Sven Schnelle 2023-12-18 130 * exit_to_user_mode_loop - do any pending work before leaving to user space
af18f155cb4bda Sven Schnelle 2023-12-18 131 */
af18f155cb4bda Sven Schnelle 2023-12-18 132 __always_inline unsigned long exit_to_user_mode_loop(struct pt_regs *regs,
a9f3a74a29af09 Thomas Gleixner 2020-07-22 133 unsigned long ti_work)
a9f3a74a29af09 Thomas Gleixner 2020-07-22 @134 {
a9f3a74a29af09 Thomas Gleixner 2020-07-22 135 /*
a9f3a74a29af09 Thomas Gleixner 2020-07-22 136 * Before returning to user space ensure that all pending work
a9f3a74a29af09 Thomas Gleixner 2020-07-22 137 * items have been completed.
a9f3a74a29af09 Thomas Gleixner 2020-07-22 138 */
a9f3a74a29af09 Thomas Gleixner 2020-07-22 139 while (ti_work & EXIT_TO_USER_MODE_WORK) {
a9f3a74a29af09 Thomas Gleixner 2020-07-22 140
a9f3a74a29af09 Thomas Gleixner 2020-07-22 141 local_irq_enable_exit_to_user(ti_work);
a9f3a74a29af09 Thomas Gleixner 2020-07-22 142
a9f3a74a29af09 Thomas Gleixner 2020-07-22 143 if (ti_work & _TIF_NEED_RESCHED)
a9f3a74a29af09 Thomas Gleixner 2020-07-22 144 schedule();
a9f3a74a29af09 Thomas Gleixner 2020-07-22 145
a9f3a74a29af09 Thomas Gleixner 2020-07-22 146 if (ti_work & _TIF_UPROBE)
a9f3a74a29af09 Thomas Gleixner 2020-07-22 147 uprobe_notify_resume(regs);
a9f3a74a29af09 Thomas Gleixner 2020-07-22 148
a9f3a74a29af09 Thomas Gleixner 2020-07-22 149 if (ti_work & _TIF_PATCH_PENDING)
a9f3a74a29af09 Thomas Gleixner 2020-07-22 150 klp_update_patch_state(current);
a9f3a74a29af09 Thomas Gleixner 2020-07-22 151
12db8b690010cc Jens Axboe 2020-10-26 152 if (ti_work & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL))
8ba62d37949e24 Eric W. Biederman 2022-02-09 153 arch_do_signal_or_restart(regs);
a9f3a74a29af09 Thomas Gleixner 2020-07-22 154
a68de80f61f6af Sean Christopherson 2021-09-01 155 if (ti_work & _TIF_NOTIFY_RESUME)
03248addadf1a5 Eric W. Biederman 2022-02-09 156 resume_user_mode_work(regs);
a9f3a74a29af09 Thomas Gleixner 2020-07-22 157
a9f3a74a29af09 Thomas Gleixner 2020-07-22 158 /* Architecture specific TIF work */
a9f3a74a29af09 Thomas Gleixner 2020-07-22 159 arch_exit_to_user_mode_work(regs, ti_work);
a9f3a74a29af09 Thomas Gleixner 2020-07-22 160
a9f3a74a29af09 Thomas Gleixner 2020-07-22 161 /*
a9f3a74a29af09 Thomas Gleixner 2020-07-22 162 * Disable interrupts and reevaluate the work flags as they
a9f3a74a29af09 Thomas Gleixner 2020-07-22 163 * might have changed while interrupts and preemption was
a9f3a74a29af09 Thomas Gleixner 2020-07-22 164 * enabled above.
a9f3a74a29af09 Thomas Gleixner 2020-07-22 165 */
a9f3a74a29af09 Thomas Gleixner 2020-07-22 166 local_irq_disable_exit_to_user();
47b8ff194c1fd7 Frederic Weisbecker 2021-02-01 167
47b8ff194c1fd7 Frederic Weisbecker 2021-02-01 168 /* Check if any of the above work has queued a deferred wakeup */
f268c3737ecaef Frederic Weisbecker 2021-05-27 169 tick_nohz_user_enter_prepare();
47b8ff194c1fd7 Frederic Weisbecker 2021-02-01 170
6ce895128b3bff Mark Rutland 2021-11-29 171 ti_work = read_thread_flags();
a9f3a74a29af09 Thomas Gleixner 2020-07-22 172 }
a9f3a74a29af09 Thomas Gleixner 2020-07-22 173
a9f3a74a29af09 Thomas Gleixner 2020-07-22 174 /* Return the latest work state for arch_exit_to_user_mode() */
a9f3a74a29af09 Thomas Gleixner 2020-07-22 175 return ti_work;
a9f3a74a29af09 Thomas Gleixner 2020-07-22 176 }
a9f3a74a29af09 Thomas Gleixner 2020-07-22 177
--
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