Message ID | 20210609032314.27232-1-qiang.zhang@windriver.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show |
Series | [v2] eventfd: convert global percpu eventfd_wake_count to ctx percpu eventfd_wake_count | expand |
Hi, Thank you for the patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on v5.13-rc5 next-20210608] [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] url: https://github.com/0day-ci/linux/commits/qiang-zhang-windriver-com/eventfd-convert-global-percpu-eventfd_wake_count-to-ctx-percpu-eventfd_wake_count/20210609-112354 base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 368094df48e680fa51cedb68537408cfa64b788e config: riscv-randconfig-s031-20210608 (attached as .config) compiler: riscv32-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.3-341-g8af24329-dirty # https://github.com/0day-ci/linux/commit/e11cefc5baf3f6cfb1ec8cd99b80422b6f592517 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review qiang-zhang-windriver-com/eventfd-convert-global-percpu-eventfd_wake_count-to-ctx-percpu-eventfd_wake_count/20210609-112354 git checkout e11cefc5baf3f6cfb1ec8cd99b80422b6f592517 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' W=1 ARCH=riscv If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@intel.com> All errors (new ones prefixed by >>): In file included from drivers/vhost/net.c:9: >> include/linux/eventfd.h:37:14: error: field 'kref' has incomplete type 37 | struct kref kref; | ^~~~ Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for ERRATA_SIFIVE Depends on RISCV_ERRATA_ALTERNATIVE Selected by - SOC_SIFIVE vim +/kref +37 include/linux/eventfd.h 35 36 struct eventfd_ctx { > 37 struct kref kref; 38 wait_queue_head_t wqh; 39 /* 40 * Every time that a write(2) is performed on an eventfd, the 41 * value of the __u64 being written is added to "count" and a 42 * wakeup is performed on "wqh". A read(2) will return the "count" 43 * value to userspace, and will reset "count" to zero. The kernel 44 * side eventfd_signal() also, adds to the "count" counter and 45 * issue a wakeup. 46 */ 47 __u64 count; 48 unsigned int flags; 49 int id; 50 int __percpu *eventfd_wake_count; 51 }; 52 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
Hi, Thank you for the patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on v5.13-rc5 next-20210609] [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] url: https://github.com/0day-ci/linux/commits/qiang-zhang-windriver-com/eventfd-convert-global-percpu-eventfd_wake_count-to-ctx-percpu-eventfd_wake_count/20210609-112354 base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 368094df48e680fa51cedb68537408cfa64b788e config: x86_64-randconfig-a015-20210608 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project d2012d965d60c3258b3a69d024491698f8aec386) 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 # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://github.com/0day-ci/linux/commit/e11cefc5baf3f6cfb1ec8cd99b80422b6f592517 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review qiang-zhang-windriver-com/eventfd-convert-global-percpu-eventfd_wake_count-to-ctx-percpu-eventfd_wake_count/20210609-112354 git checkout e11cefc5baf3f6cfb1ec8cd99b80422b6f592517 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@intel.com> All errors (new ones prefixed by >>): In file included from drivers/vhost/net.c:9: >> include/linux/eventfd.h:37:14: error: field has incomplete type 'struct kref' struct kref kref; ^ include/linux/eventfd.h:37:9: note: forward declaration of 'struct kref' struct kref kref; ^ 1 error generated. vim +37 include/linux/eventfd.h 35 36 struct eventfd_ctx { > 37 struct kref kref; 38 wait_queue_head_t wqh; 39 /* 40 * Every time that a write(2) is performed on an eventfd, the 41 * value of the __u64 being written is added to "count" and a 42 * wakeup is performed on "wqh". A read(2) will return the "count" 43 * value to userspace, and will reset "count" to zero. The kernel 44 * side eventfd_signal() also, adds to the "count" counter and 45 * issue a wakeup. 46 */ 47 __u64 count; 48 unsigned int flags; 49 int id; 50 int __percpu *eventfd_wake_count; 51 }; 52 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
diff --git a/fs/aio.c b/fs/aio.c index 76ce0cc3ee4e..b45983d5d35a 100644 --- a/fs/aio.c +++ b/fs/aio.c @@ -1695,7 +1695,7 @@ static int aio_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, list_del(&iocb->ki_list); iocb->ki_res.res = mangle_poll(mask); req->done = true; - if (iocb->ki_eventfd && eventfd_signal_count()) { + if (iocb->ki_eventfd && eventfd_signal_count(iocb->ki_eventfd)) { iocb = NULL; INIT_WORK(&req->work, aio_poll_put_work); schedule_work(&req->work); diff --git a/fs/eventfd.c b/fs/eventfd.c index e265b6dd4f34..b1df2c5720a7 100644 --- a/fs/eventfd.c +++ b/fs/eventfd.c @@ -25,26 +25,9 @@ #include <linux/idr.h> #include <linux/uio.h> -DEFINE_PER_CPU(int, eventfd_wake_count); static DEFINE_IDA(eventfd_ida); -struct eventfd_ctx { - struct kref kref; - wait_queue_head_t wqh; - /* - * Every time that a write(2) is performed on an eventfd, the - * value of the __u64 being written is added to "count" and a - * wakeup is performed on "wqh". A read(2) will return the "count" - * value to userspace, and will reset "count" to zero. The kernel - * side eventfd_signal() also, adds to the "count" counter and - * issue a wakeup. - */ - __u64 count; - unsigned int flags; - int id; -}; - /** * eventfd_signal - Adds @n to the eventfd counter. * @ctx: [in] Pointer to the eventfd context. @@ -71,17 +54,17 @@ __u64 eventfd_signal(struct eventfd_ctx *ctx, __u64 n) * it returns true, the eventfd_signal() call should be deferred to a * safe context. */ - if (WARN_ON_ONCE(this_cpu_read(eventfd_wake_count))) + if (WARN_ON_ONCE(this_cpu_read(*ctx->eventfd_wake_count))) return 0; spin_lock_irqsave(&ctx->wqh.lock, flags); - this_cpu_inc(eventfd_wake_count); + this_cpu_inc(*ctx->eventfd_wake_count); if (ULLONG_MAX - ctx->count < n) n = ULLONG_MAX - ctx->count; ctx->count += n; if (waitqueue_active(&ctx->wqh)) wake_up_locked_poll(&ctx->wqh, EPOLLIN); - this_cpu_dec(eventfd_wake_count); + this_cpu_dec(*ctx->eventfd_wake_count); spin_unlock_irqrestore(&ctx->wqh.lock, flags); return n; @@ -92,6 +75,9 @@ static void eventfd_free_ctx(struct eventfd_ctx *ctx) { if (ctx->id >= 0) ida_simple_remove(&eventfd_ida, ctx->id); + + if (ctx->eventfd_wake_count) + free_percpu(ctx->eventfd_wake_count); kfree(ctx); } @@ -421,6 +407,10 @@ static int do_eventfd(unsigned int count, int flags) if (!ctx) return -ENOMEM; + ctx->eventfd_wake_count = alloc_percpu(int); + if (!ctx->eventfd_wake_count) + goto err; + kref_init(&ctx->kref); init_waitqueue_head(&ctx->wqh); ctx->count = count; diff --git a/include/linux/eventfd.h b/include/linux/eventfd.h index fa0a524baed0..7288328bdbc8 100644 --- a/include/linux/eventfd.h +++ b/include/linux/eventfd.h @@ -29,11 +29,27 @@ #define EFD_SHARED_FCNTL_FLAGS (O_CLOEXEC | O_NONBLOCK) #define EFD_FLAGS_SET (EFD_SHARED_FCNTL_FLAGS | EFD_SEMAPHORE) -struct eventfd_ctx; struct file; #ifdef CONFIG_EVENTFD +struct eventfd_ctx { + struct kref kref; + wait_queue_head_t wqh; + /* + * Every time that a write(2) is performed on an eventfd, the + * value of the __u64 being written is added to "count" and a + * wakeup is performed on "wqh". A read(2) will return the "count" + * value to userspace, and will reset "count" to zero. The kernel + * side eventfd_signal() also, adds to the "count" counter and + * issue a wakeup. + */ + __u64 count; + unsigned int flags; + int id; + int __percpu *eventfd_wake_count; +}; + void eventfd_ctx_put(struct eventfd_ctx *ctx); struct file *eventfd_fget(int fd); struct eventfd_ctx *eventfd_ctx_fdget(int fd); @@ -43,11 +59,10 @@ int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx, wait_queue_entry_t *w __u64 *cnt); void eventfd_ctx_do_read(struct eventfd_ctx *ctx, __u64 *cnt); -DECLARE_PER_CPU(int, eventfd_wake_count); -static inline bool eventfd_signal_count(void) +static inline bool eventfd_signal_count(struct eventfd_ctx *ctx) { - return this_cpu_read(eventfd_wake_count); + return this_cpu_read(*ctx->eventfd_wake_count); } #else /* CONFIG_EVENTFD */ @@ -78,7 +93,7 @@ static inline int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx, return -ENOSYS; } -static inline bool eventfd_signal_count(void) +static inline bool eventfd_signal_count(struct eventfd_ctx *ctx) { return false; }