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Defined in 1 files as a function:

Referenced in 5 files:

Smatch caller information:

mm/shmem.c shmem_add_to_page_cache() -> folio_ref_sub()

Type Parameter Key Value
PARAM_VALUE 0 folio 4096-ptr_max
PARAM_VALUE 0 folio->mapping 0
PARAM_VALUE 0 *folio->_mm_id 0-4294967295
CAPPED_DATA 0 folio 1
CAPPED_DATA 0 folio->index 1
DATA_SOURCE 0 folio $0
DATA_SOURCE 1 nr r folio_nr_pages
RX_PATH
TASK_NOT_RUNNING
NOCHECK_CALL
UNITS 1 nr unit_page
HALF_LOCKED2 &session->mutex
HALF_LOCKED2 &state.ctx->map_changing_lock
HALF_LOCKED2 _T->lock

mm/memory.c copy_present_ptes() -> folio_ref_sub()

Type Parameter Key Value
PARAM_VALUE 0 folio 4096-ptr_max
PARAM_VALUE 0 folio->mapping 1-u64max
PARAM_VALUE 1 nr 1-s32max
CAPPED_DATA 0 folio 1
CAPPED_DATA 1 nr 1
DATA_SOURCE 0 folio r _compound_head
DATA_SOURCE 1 nr r folio_pte_batch_flags
RX_PATH
TASK_NOT_RUNNING
NOCHECK_CALL
LOCK2 &mm->mmap_lock
LOCK2 &oldmm->mmap_lock
LOCK2 dst_ptl
LOCK2 rcu_read
LOCK2 src_ptl
TYPE_LOCK (struct mm_struct)->mmap_lock

mm/khugepaged.c try_collapse_pte_mapped_thp() -> folio_ref_sub()

Type Parameter Key Value
PARAM_VALUE 0 folio 4096-ptr_max
PARAM_VALUE 0 folio->mapping 1-u64max
PARAM_VALUE 0 folio->mapping->host->i_sb->s_export_op->encode_fh 0,2,1398972869330624512,1616549510479982592,2037984473558433792
PARAM_VALUE 0 folio->mapping->host->i_sb->s_export_op->fh_to_parent 0,148606482432692224,436469935444291584,467281172929331200
PARAM_VALUE 0 folio->mapping->host->i_sb->s_export_op->get_parent 0,8931,264940071972966400,291591359766798336,565128213429456896
PARAM_VALUE 0 *folio->_mm_id 0-4294967295
PARAM_VALUE 1 nr s32min-(-1),1-s32max
CAPPED_DATA 0 folio 1
DATA_SOURCE 0 folio r filemap_lock_folio
NOSPEC 1 nr
RX_PATH
TASK_NOT_RUNNING
NOCHECK_CALL
USER_DATA 1 nr s32min-(-2),1-s32max[c][u]
LOCK2 rcu_read
HALF_LOCKED2 &mm->mmap_lock
HALF_LOCKED2 &mm->mmap_lock
HALF_LOCKED2 ptl

mm/khugepaged.c try_collapse_pte_mapped_thp() -> folio_ref_sub()

Type Parameter Key Value
PARAM_VALUE 0 folio 4096-ptr_max
PARAM_VALUE 0 folio->mapping 1-u64max
PARAM_VALUE 0 folio->mapping->host->i_sb->s_export_op->encode_fh 0,2,1398972869330624512,1616549510479982592,2037984473558433792
PARAM_VALUE 0 folio->mapping->host->i_sb->s_export_op->fh_to_parent 0,148606482432692224,436469935444291584,467281172929331200
PARAM_VALUE 0 folio->mapping->host->i_sb->s_export_op->get_parent 0,8931,264940071972966400,291591359766798336,565128213429456896
PARAM_VALUE 0 *folio->_mm_id 0-4294967295
PARAM_VALUE 1 nr s32min-(-1),1-s32max
CAPPED_DATA 0 folio 1
DATA_SOURCE 0 folio r filemap_lock_folio
RX_PATH
TASK_NOT_RUNNING
NOCHECK_CALL
USER_DATA 1 nr 1-s32max[c][u]
LOCK2 rcu_read
HALF_LOCKED2 &mm->mmap_lock
HALF_LOCKED2 &mm->mmap_lock
HALF_LOCKED2 ptl

mm/swap_state.c swap_cache_del_folio() -> folio_ref_sub()

Type Parameter Key Value
PARAM_VALUE 0 folio 4096-ptr_max
PARAM_VALUE 0 folio->mapping->host->i_op->get_offset_ctx 0,2606890545167454208
PARAM_VALUE 0 folio->mapping->host->i_op->readlink 0,1728600404483375104,2832489546165891072,2874824064778891264,3069732422725099520,4516337085607264256
PARAM_VALUE 0 folio->mapping->host->i_sb->s_cop->empty_dir 0,86,661756434209751040,4392966320616476672,5234023279986843648,8614756098313990144
PARAM_VALUE 0 folio->mapping->host->i_sb->s_cop->get_context 0,706,17350455714160640,4513809449498124288,5149251875611672576,7067778626864828416
PARAM_VALUE 0 folio->mapping->host->i_sb->s_cop->inode_info_offs 1632,1720,1808,2632,2648,2704,2712
PARAM_VALUE 0 folio->mapping->host->i_sb->s_cop->set_context 0,67,317457138841939968,3250154607523569664,5979066299606671360,6756104566897242112
PARAM_VALUE 0 folio->mapping->host->i_sb->s_export_op->encode_fh 0,2,1398972869330624512,1616549510479982592,2037984473558433792,2776440803454029824,3228746867770966016,3502492669594062848,3526768263295340544,3559173554394271744,5000850239487131648,5583386343686406144,5817357685191483392-s64max
PARAM_VALUE 0 folio->mapping->host->i_sb->s_export_op->fh_to_dentry 0,8684,447817974243774464,687732489194512384,742201802719268864,868497899885588480,1471448175530500096,2021658383390310400,2445877819203563520,2512819722689847296,2649270699546726400,2761259683714371584,2893332316235677696-s64max
PARAM_VALUE 0 folio->mapping->host->i_sb->s_export_op->fh_to_parent 0,4672,5297,148606482432692224,436469935444291584,457356038048772096,467281172929331200,529780027764285440,1092893949038768128,1556959531105513472,1608953577475584000,1649536479961075712,2404761408063094784,2970908329832960000-s64max
PARAM_VALUE 0 folio->mapping->host->i_sb->s_export_op->get_parent 0,8931,264940071972966400,291591359766798336,565128213429456896,893189740598853632,1241177127089143808,1474696885321834496,1812477326828269568,1893665921928286208,2210088671756947456,2437012291923775488,2483979068402987008-s64max
PARAM_VALUE 0 folio->mapping->i_mmap_rwsem.first_waiter->handoff_set 0-1
PARAM_VALUE 0 folio->mapping->i_mmap_rwsem.first_waiter->type 0-1
PARAM_VALUE 0 folio->swap.val 0
PARAM_VALUE 0 *folio->_mm_id 0-4294967295
CAPPED_DATA 0 folio 1
DATA_SOURCE 0 folio $0
RX_PATH
TASK_NOT_RUNNING
NOCHECK_CALL
USER_DATA 0 folio->mapping->writeback_index 0-524287[c]
UNITS 0 folio unit_page
HALF_LOCKED2 global &mf_mutex
HALF_LOCKED2 vmf->ptl