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Date: Fri, 3 Jul 2020 00:15:06 +0800
From: kernel test robot <lkp@...el.com>
To: Nicholas Piggin <npiggin@...il.com>
Cc: kbuild-all@...ts.01.org, Nicholas Piggin <npiggin@...il.com>,
Will Deacon <will@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Boqun Feng <boqun.feng@...il.com>,
Ingo Molnar <mingo@...hat.com>,
Waiman Long <longman@...hat.com>,
Anton Blanchard <anton@...abs.org>,
linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH 6/8] powerpc/pseries: implement paravirt qspinlocks for
SPLPAR
Hi Nicholas,
I love your patch! Yet something to improve:
[auto build test ERROR on powerpc/next]
[also build test ERROR on tip/locking/core v5.8-rc3 next-20200702]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use as documented in
https://git-scm.com/docs/git-format-patch]
url: https://github.com/0day-ci/linux/commits/Nicholas-Piggin/powerpc-queued-spinlocks-and-rwlocks/20200702-155158
base: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
config: powerpc-allyesconfig (attached as .config)
compiler: powerpc64-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
All errors (new ones prefixed by >>):
kernel/locking/lock_events.c:61:16: warning: no previous prototype for 'lockevent_read' [-Wmissing-prototypes]
61 | ssize_t __weak lockevent_read(struct file *file, char __user *user_buf,
| ^~~~~~~~~~~~~~
kernel/locking/lock_events.c: In function 'skip_lockevent':
>> kernel/locking/lock_events.c:126:12: error: implicit declaration of function 'pv_is_native_spin_unlock' [-Werror=implicit-function-declaration]
126 | pv_on = !pv_is_native_spin_unlock();
| ^~~~~~~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
vim +/pv_is_native_spin_unlock +126 kernel/locking/lock_events.c
fb346fd9fc081c Waiman Long 2019-04-04 57
fb346fd9fc081c Waiman Long 2019-04-04 58 /*
fb346fd9fc081c Waiman Long 2019-04-04 59 * The lockevent_read() function can be overridden.
fb346fd9fc081c Waiman Long 2019-04-04 60 */
fb346fd9fc081c Waiman Long 2019-04-04 @61 ssize_t __weak lockevent_read(struct file *file, char __user *user_buf,
fb346fd9fc081c Waiman Long 2019-04-04 62 size_t count, loff_t *ppos)
fb346fd9fc081c Waiman Long 2019-04-04 63 {
fb346fd9fc081c Waiman Long 2019-04-04 64 char buf[64];
fb346fd9fc081c Waiman Long 2019-04-04 65 int cpu, id, len;
fb346fd9fc081c Waiman Long 2019-04-04 66 u64 sum = 0;
fb346fd9fc081c Waiman Long 2019-04-04 67
fb346fd9fc081c Waiman Long 2019-04-04 68 /*
fb346fd9fc081c Waiman Long 2019-04-04 69 * Get the counter ID stored in file->f_inode->i_private
fb346fd9fc081c Waiman Long 2019-04-04 70 */
fb346fd9fc081c Waiman Long 2019-04-04 71 id = (long)file_inode(file)->i_private;
fb346fd9fc081c Waiman Long 2019-04-04 72
fb346fd9fc081c Waiman Long 2019-04-04 73 if (id >= lockevent_num)
fb346fd9fc081c Waiman Long 2019-04-04 74 return -EBADF;
fb346fd9fc081c Waiman Long 2019-04-04 75
fb346fd9fc081c Waiman Long 2019-04-04 76 for_each_possible_cpu(cpu)
fb346fd9fc081c Waiman Long 2019-04-04 77 sum += per_cpu(lockevents[id], cpu);
fb346fd9fc081c Waiman Long 2019-04-04 78 len = snprintf(buf, sizeof(buf) - 1, "%llu\n", sum);
fb346fd9fc081c Waiman Long 2019-04-04 79
fb346fd9fc081c Waiman Long 2019-04-04 80 return simple_read_from_buffer(user_buf, count, ppos, buf, len);
fb346fd9fc081c Waiman Long 2019-04-04 81 }
fb346fd9fc081c Waiman Long 2019-04-04 82
fb346fd9fc081c Waiman Long 2019-04-04 83 /*
fb346fd9fc081c Waiman Long 2019-04-04 84 * Function to handle write request
fb346fd9fc081c Waiman Long 2019-04-04 85 *
fb346fd9fc081c Waiman Long 2019-04-04 86 * When idx = reset_cnts, reset all the counts.
fb346fd9fc081c Waiman Long 2019-04-04 87 */
fb346fd9fc081c Waiman Long 2019-04-04 88 static ssize_t lockevent_write(struct file *file, const char __user *user_buf,
fb346fd9fc081c Waiman Long 2019-04-04 89 size_t count, loff_t *ppos)
fb346fd9fc081c Waiman Long 2019-04-04 90 {
fb346fd9fc081c Waiman Long 2019-04-04 91 int cpu;
fb346fd9fc081c Waiman Long 2019-04-04 92
fb346fd9fc081c Waiman Long 2019-04-04 93 /*
fb346fd9fc081c Waiman Long 2019-04-04 94 * Get the counter ID stored in file->f_inode->i_private
fb346fd9fc081c Waiman Long 2019-04-04 95 */
fb346fd9fc081c Waiman Long 2019-04-04 96 if ((long)file_inode(file)->i_private != LOCKEVENT_reset_cnts)
fb346fd9fc081c Waiman Long 2019-04-04 97 return count;
fb346fd9fc081c Waiman Long 2019-04-04 98
fb346fd9fc081c Waiman Long 2019-04-04 99 for_each_possible_cpu(cpu) {
fb346fd9fc081c Waiman Long 2019-04-04 100 int i;
fb346fd9fc081c Waiman Long 2019-04-04 101 unsigned long *ptr = per_cpu_ptr(lockevents, cpu);
fb346fd9fc081c Waiman Long 2019-04-04 102
fb346fd9fc081c Waiman Long 2019-04-04 103 for (i = 0 ; i < lockevent_num; i++)
fb346fd9fc081c Waiman Long 2019-04-04 104 WRITE_ONCE(ptr[i], 0);
fb346fd9fc081c Waiman Long 2019-04-04 105 }
fb346fd9fc081c Waiman Long 2019-04-04 106 return count;
fb346fd9fc081c Waiman Long 2019-04-04 107 }
fb346fd9fc081c Waiman Long 2019-04-04 108
fb346fd9fc081c Waiman Long 2019-04-04 109 /*
fb346fd9fc081c Waiman Long 2019-04-04 110 * Debugfs data structures
fb346fd9fc081c Waiman Long 2019-04-04 111 */
fb346fd9fc081c Waiman Long 2019-04-04 112 static const struct file_operations fops_lockevent = {
fb346fd9fc081c Waiman Long 2019-04-04 113 .read = lockevent_read,
fb346fd9fc081c Waiman Long 2019-04-04 114 .write = lockevent_write,
fb346fd9fc081c Waiman Long 2019-04-04 115 .llseek = default_llseek,
fb346fd9fc081c Waiman Long 2019-04-04 116 };
fb346fd9fc081c Waiman Long 2019-04-04 117
bf20616f46e536 Waiman Long 2019-04-04 118 #ifdef CONFIG_PARAVIRT_SPINLOCKS
bf20616f46e536 Waiman Long 2019-04-04 119 #include <asm/paravirt.h>
bf20616f46e536 Waiman Long 2019-04-04 120
bf20616f46e536 Waiman Long 2019-04-04 121 static bool __init skip_lockevent(const char *name)
bf20616f46e536 Waiman Long 2019-04-04 122 {
bf20616f46e536 Waiman Long 2019-04-04 123 static int pv_on __initdata = -1;
bf20616f46e536 Waiman Long 2019-04-04 124
bf20616f46e536 Waiman Long 2019-04-04 125 if (pv_on < 0)
bf20616f46e536 Waiman Long 2019-04-04 @126 pv_on = !pv_is_native_spin_unlock();
bf20616f46e536 Waiman Long 2019-04-04 127 /*
bf20616f46e536 Waiman Long 2019-04-04 128 * Skip PV qspinlock events on bare metal.
bf20616f46e536 Waiman Long 2019-04-04 129 */
bf20616f46e536 Waiman Long 2019-04-04 130 if (!pv_on && !memcmp(name, "pv_", 3))
bf20616f46e536 Waiman Long 2019-04-04 131 return true;
bf20616f46e536 Waiman Long 2019-04-04 132 return false;
bf20616f46e536 Waiman Long 2019-04-04 133 }
bf20616f46e536 Waiman Long 2019-04-04 134 #else
bf20616f46e536 Waiman Long 2019-04-04 135 static inline bool skip_lockevent(const char *name)
bf20616f46e536 Waiman Long 2019-04-04 136 {
bf20616f46e536 Waiman Long 2019-04-04 137 return false;
bf20616f46e536 Waiman Long 2019-04-04 138 }
bf20616f46e536 Waiman Long 2019-04-04 139 #endif
bf20616f46e536 Waiman Long 2019-04-04 140
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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