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Subject[rcu:dev.2019.04.09a 55/55] htmldocs: include/linux/rcupdate.h:837: warning: Function parameter or member 'rhf' not described in 'kfree_rcu'
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2019.04.09a
head: 108210466eaf3f9e0e18e250c3af4f2525963a60
commit: 108210466eaf3f9e0e18e250c3af4f2525963a60 [55/55] rcu: Make kfree_rcu() ignore NULL pointers
reproduce: make htmldocs

All warnings (new ones prefixed by >>):

WARNING: convert(1) not found, for SVG to PDF conversion install ImageMagick (https://www.imagemagick.org)
include/linux/generic-radix-tree.h:1: warning: no structured comments found
>> include/linux/rcupdate.h:837: warning: Function parameter or member 'rhf' not described in 'kfree_rcu'
include/linux/rcupdate.h:837: warning: Excess function parameter 'rcu_head' description in 'kfree_rcu'
kernel/rcu/tree_plugin.h:1: warning: no structured comments found
kernel/rcu/tree_plugin.h:1: warning: no structured comments found
include/linux/firmware/intel/stratix10-svc-client.h:1: warning: no structured comments found
include/linux/gpio/driver.h:371: warning: Function parameter or member 'init_valid_mask' not described in 'gpio_chip'
include/linux/i2c.h:343: warning: Function parameter or member 'init_irq' not described in 'i2c_client'
include/linux/iio/hw-consumer.h:1: warning: no structured comments found
include/linux/input/sparse-keymap.h:46: warning: Function parameter or member 'sw' not described in 'key_entry'
include/linux/regulator/machine.h:199: warning: Function parameter or member 'max_uV_step' not described in 'regulation_constraints'
include/linux/regulator/driver.h:228: warning: Function parameter or member 'resume' not described in 'regulator_ops'
drivers/slimbus/stream.c:1: warning: no structured comments found
include/linux/spi/spi.h:188: warning: Function parameter or member 'driver_override' not described in 'spi_device'
drivers/target/target_core_device.c:1: warning: no structured comments found
drivers/usb/typec/bus.c:1: warning: no structured comments found
drivers/usb/typec/class.c:1: warning: no structured comments found
include/linux/w1.h:281: warning: Function parameter or member 'of_match_table' not described in 'w1_family'
fs/direct-io.c:257: warning: Excess function parameter 'offset' description in 'dio_complete'
fs/file_table.c:1: warning: no structured comments found
fs/libfs.c:477: warning: Excess function parameter 'available' description in 'simple_write_end'
fs/posix_acl.c:646: warning: Function parameter or member 'inode' not described in 'posix_acl_update_mode'
fs/posix_acl.c:646: warning: Function parameter or member 'mode_p' not described in 'posix_acl_update_mode'
fs/posix_acl.c:646: warning: Function parameter or member 'acl' not described in 'posix_acl_update_mode'
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c:294: warning: Excess function parameter 'mm' description in 'amdgpu_mn_invalidate_range_start_hsa'
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c:294: warning: Excess function parameter 'start' description in 'amdgpu_mn_invalidate_range_start_hsa'
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c:294: warning: Excess function parameter 'end' description in 'amdgpu_mn_invalidate_range_start_hsa'
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c:343: warning: Excess function parameter 'mm' description in 'amdgpu_mn_invalidate_range_end'
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c:343: warning: Excess function parameter 'start' description in 'amdgpu_mn_invalidate_range_end'
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c:343: warning: Excess function parameter 'end' description in 'amdgpu_mn_invalidate_range_end'
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c:183: warning: Function parameter or member 'blockable' not described in 'amdgpu_mn_read_lock'
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c:295: warning: Function parameter or member 'range' not described in 'amdgpu_mn_invalidate_range_start_hsa'
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c:295: warning: Excess function parameter 'mm' description in 'amdgpu_mn_invalidate_range_start_hsa'
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c:295: warning: Excess function parameter 'start' description in 'amdgpu_mn_invalidate_range_start_hsa'
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c:295: warning: Excess function parameter 'end' description in 'amdgpu_mn_invalidate_range_start_hsa'
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c:344: warning: Function parameter or member 'range' not described in 'amdgpu_mn_invalidate_range_end'
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c:344: warning: Excess function parameter 'mm' description in 'amdgpu_mn_invalidate_range_end'
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c:344: warning: Excess function parameter 'start' description in 'amdgpu_mn_invalidate_range_end'
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c:344: warning: Excess function parameter 'end' description in 'amdgpu_mn_invalidate_range_end'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:374: warning: cannot understand function prototype: 'struct amdgpu_vm_pt_cursor '
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:375: warning: cannot understand function prototype: 'struct amdgpu_vm_pt_cursor '
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:547: warning: Function parameter or member 'adev' not described in 'for_each_amdgpu_vm_pt_leaf'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:547: warning: Function parameter or member 'vm' not described in 'for_each_amdgpu_vm_pt_leaf'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:547: warning: Function parameter or member 'start' not described in 'for_each_amdgpu_vm_pt_leaf'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:547: warning: Function parameter or member 'end' not described in 'for_each_amdgpu_vm_pt_leaf'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:547: warning: Function parameter or member 'cursor' not described in 'for_each_amdgpu_vm_pt_leaf'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:595: warning: Function parameter or member 'adev' not described in 'for_each_amdgpu_vm_pt_dfs_safe'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:595: warning: Function parameter or member 'vm' not described in 'for_each_amdgpu_vm_pt_dfs_safe'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:595: warning: Function parameter or member 'cursor' not described in 'for_each_amdgpu_vm_pt_dfs_safe'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:595: warning: Function parameter or member 'entry' not described in 'for_each_amdgpu_vm_pt_dfs_safe'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:866: warning: Function parameter or member 'level' not described in 'amdgpu_vm_bo_param'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1346: warning: Function parameter or member 'params' not described in 'amdgpu_vm_update_func'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1346: warning: Function parameter or member 'bo' not described in 'amdgpu_vm_update_func'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1346: warning: Function parameter or member 'pe' not described in 'amdgpu_vm_update_func'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1346: warning: Function parameter or member 'addr' not described in 'amdgpu_vm_update_func'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1346: warning: Function parameter or member 'count' not described in 'amdgpu_vm_update_func'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1346: warning: Function parameter or member 'incr' not described in 'amdgpu_vm_update_func'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1346: warning: Function parameter or member 'flags' not described in 'amdgpu_vm_update_func'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1514: warning: Function parameter or member 'params' not described in 'amdgpu_vm_update_flags'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1514: warning: Function parameter or member 'bo' not described in 'amdgpu_vm_update_flags'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1514: warning: Function parameter or member 'level' not described in 'amdgpu_vm_update_flags'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1514: warning: Function parameter or member 'pe' not described in 'amdgpu_vm_update_flags'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1514: warning: Function parameter or member 'addr' not described in 'amdgpu_vm_update_flags'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1514: warning: Function parameter or member 'count' not described in 'amdgpu_vm_update_flags'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1514: warning: Function parameter or member 'incr' not described in 'amdgpu_vm_update_flags'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1514: warning: Function parameter or member 'flags' not described in 'amdgpu_vm_update_flags'
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:3105: warning: Function parameter or member 'pasid' not described in 'amdgpu_vm_make_compute'
drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c:375: warning: Excess function parameter 'entry' description in 'amdgpu_irq_dispatch'
drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c:376: warning: Function parameter or member 'ih' not described in 'amdgpu_irq_dispatch'
drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c:376: warning: Excess function parameter 'entry' description in 'amdgpu_irq_dispatch'
drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c:1: warning: no structured comments found
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h:128: warning: Incorrect use of kernel-doc format: Documentation Makefile include scripts source @atomic_obj
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h:203: warning: Function parameter or member 'atomic_obj' not described in 'amdgpu_display_manager'
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h:203: warning: Function parameter or member 'atomic_obj_lock' not described in 'amdgpu_display_manager'
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h:203: warning: Function parameter or member 'backlight_link' not described in 'amdgpu_display_manager'
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h:203: warning: Function parameter or member 'backlight_caps' not described in 'amdgpu_display_manager'
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h:203: warning: Function parameter or member 'freesync_module' not described in 'amdgpu_display_manager'
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h:203: warning: Function parameter or member 'fw_dmcu' not described in 'amdgpu_display_manager'
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h:203: warning: Function parameter or member 'dmcu_fw_version' not described in 'amdgpu_display_manager'
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c:1: warning: no structured comments found
include/drm/drm_drv.h:715: warning: Function parameter or member 'gem_prime_pin' not described in 'drm_driver'
include/drm/drm_drv.h:715: warning: Function parameter or member 'gem_prime_unpin' not described in 'drm_driver'
include/drm/drm_drv.h:715: warning: Function parameter or member 'gem_prime_res_obj' not described in 'drm_driver'
include/drm/drm_drv.h:715: warning: Function parameter or member 'gem_prime_get_sg_table' not described in 'drm_driver'
include/drm/drm_drv.h:715: warning: Function parameter or member 'gem_prime_import_sg_table' not described in 'drm_driver'
include/drm/drm_drv.h:715: warning: Function parameter or member 'gem_prime_vmap' not described in 'drm_driver'
include/drm/drm_drv.h:715: warning: Function parameter or member 'gem_prime_vunmap' not described in 'drm_driver'
include/drm/drm_drv.h:715: warning: Function parameter or member 'gem_prime_mmap' not described in 'drm_driver'
include/drm/drm_atomic_state_helper.h:1: warning: no structured comments found
drivers/gpu/drm/scheduler/sched_main.c:376: warning: Excess function parameter 'bad' description in 'drm_sched_stop'
drivers/gpu/drm/scheduler/sched_main.c:377: warning: Excess function parameter 'bad' description in 'drm_sched_stop'
drivers/gpu/drm/scheduler/sched_main.c:420: warning: Function parameter or member 'full_recovery' not described in 'drm_sched_start'
drivers/gpu/drm/i915/i915_vma.h:50: warning: cannot understand function prototype: 'struct i915_vma '
drivers/gpu/drm/i915/i915_vma.h:1: warning: no structured comments found
drivers/gpu/drm/i915/intel_guc_fwif.h:536: warning: cannot understand function prototype: 'struct guc_log_buffer_state '
drivers/gpu/drm/i915/i915_trace.h:1: warning: no structured comments found
drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h:126: warning: Function parameter or member 'hw_id' not described in 'komeda_component'
drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h:126: warning: Function parameter or member 'max_active_outputs' not described in 'komeda_component'
drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h:126: warning: Function parameter or member 'supported_outputs' not described in 'komeda_component'
drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h:142: warning: Function parameter or member 'output_port' not described in 'komeda_component_output'
drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h:196: warning: Function parameter or member 'component' not described in 'komeda_component_state'
drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h:196: warning: Function parameter or member 'crtc' not described in 'komeda_component_state'

vim +837 include/linux/rcupdate.h

795
796 /*
797 * Helper macro for kfree_rcu() to prevent argument-expansion eyestrain.
798 */
799 #define __kfree_rcu(head, offset) \
800 do { \
801 BUILD_BUG_ON(!__is_kfree_rcu_offset(offset)); \
802 kfree_call_rcu(head, (rcu_callback_t)(unsigned long)(offset)); \
803 } while (0)
804
805 /**
806 * kfree_rcu() - kfree an object after a grace period.
807 * @ptr: pointer to kfree
808 * @rcu_head: the name of the struct rcu_head within the type of @ptr.
809 *
810 * Many rcu callbacks functions just call kfree() on the base structure.
811 * These functions are trivial, but their size adds up, and furthermore
812 * when they are used in a kernel module, that module must invoke the
813 * high-latency rcu_barrier() function at module-unload time.
814 *
815 * The kfree_rcu() function handles this issue. Rather than encoding a
816 * function address in the embedded rcu_head structure, kfree_rcu() instead
817 * encodes the offset of the rcu_head structure within the base structure.
818 * Because the functions are not allowed in the low-order 4096 bytes of
819 * kernel virtual memory, offsets up to 4095 bytes can be accommodated.
820 * If the offset is larger than 4095 bytes, a compile-time error will
821 * be generated in __kfree_rcu(). If this error is triggered, you can
822 * either fall back to use of call_rcu() or rearrange the structure to
823 * position the rcu_head structure into the first 4096 bytes.
824 *
825 * Note that the allowable offset might decrease in the future, for example,
826 * to allow something like kmem_cache_free_rcu().
827 *
828 * The BUILD_BUG_ON check must not involve any function calls, hence the
829 * checks are done in macros here.
830 */
831 #define kfree_rcu(ptr, rhf) \
832 do { \
833 typeof (ptr) ___p = (ptr); \
834 \
835 if (___p) \
836 __kfree_rcu(&((___p)->rhf), offsetof(typeof(*(ptr)), rhf)); \
> 837 } while (0)
838

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