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incrementing their refcount, then convert hugetlb cma to use the > cma_alloc_frozen_compound() and cma_release_frozen() and remove the > unused cma_{alloc,free}_folio(), also move the cma_validate_zones() > into mm/internal.h since no outside user. > > The set_pages_refcounted() is only called to set non-compound pages > after above changes, so remove the processing about PageHead. > > Signed-off-by: Kefeng Wang > --- > include/linux/cma.h | 26 +++-------- > mm/cma.c | 107 +++++++++++++++++++++++++++++--------------- > mm/hugetlb_cma.c | 24 +++++----- > mm/internal.h | 10 ++--- > 4 files changed, 97 insertions(+), 70 deletions(-) > This breaks booting of Qualcomm RB3 Gen2: [ 9.500774] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000008 [ 9.509862] Mem abort info: [ 9.512745] ESR = 0x0000000096000004 [ 9.516597] EC = 0x25: DABT (current EL), IL = 32 bits [ 9.522050] SET = 0, FnV = 0 [ 9.525194] EA = 0, S1PTW = 0 [ 9.528429] FSC = 0x04: level 0 translation fault [ 9.533440] Data abort info: [ 9.536400] ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000 [ 9.542030] CM = 0, WnR = 0, TnD = 0, TagAccess = 0 [ 9.547224] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [ 9.552684] [0000000000000008] user address but active_mm is swapper [ 9.559237] Internal error: Oops: 0000000096000004 [#1] SMP [ 9.565054] Modules linked in: [ 9.568202] CPU: 7 UID: 0 PID: 59 Comm: kworker/u32:1 Not tainted 6.19.0-rc3-00212-gfb9a328d3040 #4016 PREEMPT [ 9.578552] Hardware name: Qualcomm Technologies, Inc. Robotics RB3gen2 (DT) [ 9.585792] Workqueue: events_unbound deferred_probe_work_func [ 9.591791] pstate: 204000c5 (nzCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 9.598941] pc : __get_pfnblock_flags_mask.isra.0+0x30/0x60 [ 9.604669] lr : free_pcppages_bulk+0x120/0x274 [ 9.609327] sp : ffff8000808ab610 [ 9.612741] x29: ffff8000808ab610 x28: 0000000000000001 x27: ffff0001797fa380 [ 9.620071] x26: ffffa5ded75b3800 x25: 0000000000000004 x24: ffff0001797fa390 [ 9.627399] x23: ffffa5ded7850ea0 x22: 0000000000000001 x21: 000000000000003a [ 9.634728] x20: ffff00017f41b020 x19: ffff0001797fa3f0 x18: ffff000080a2a9e8 [ 9.642057] x17: ffff000080a2a9e8 x16: ffff0000803c1b50 x15: 0000000000000003 [ 9.649385] x14: 0000000000000028 x13: 0000000000006aa1 x12: 0000000000000000 [ 9.656707] x11: 0000000000000001 x10: 0000000000000000 x9 : fffffdffc1f8c000 [ 9.664037] x8 : ffff00017f41b028 x7 : ffff00017f41ae00 x6 : fffffdffc1f8c008 [ 9.671364] x5 : fffffc08070506c0 x4 : 000001fffff8100e x3 : 0001fffff8100e0a [ 9.678693] x2 : 0000000000000000 x1 : 0000000000000017 x0 : fffffc08070506c0 [ 9.686021] Call trace: [ 9.688537] __get_pfnblock_flags_mask.isra.0+0x30/0x60 (P) [ 9.694257] free_frozen_page_commit.isra.0+0x1a8/0x478 [ 9.699628] __free_frozen_pages+0x240/0x5c0 [ 9.704013] free_contig_frozen_range+0xc8/0x110 [ 9.708764] __cma_release_frozen+0x54/0x188 [ 9.713159] cma_release+0x4c/0x78 [ 9.716661] dma_free_contiguous+0x2c/0x74 [ 9.720870] dma_direct_free+0xf4/0x188 [ 9.724814] dma_free_attrs+0xa8/0x1d8 [ 9.728666] qcom_scm_pas_init_image+0x178/0x18c [ 9.733414] qcom_mdt_pas_init+0x130/0x23c [ 9.737623] qcom_mdt_load+0x44/0xa0 [ 9.741299] venus_boot+0x14c/0x2e8 [ 9.744891] venus_probe+0x32c/0x5d8 [ 9.748567] platform_probe+0x5c/0xa4 [ 9.752332] really_probe+0xbc/0x2c0 [ 9.756009] __driver_probe_device+0x78/0x120 [ 9.760483] driver_probe_device+0x3c/0x160 [ 9.764779] __device_attach_driver+0xb8/0x140 [ 9.769347] bus_for_each_drv+0x88/0xe8 [ 9.773290] __device_attach+0xa0/0x198 [ 9.777232] device_initial_probe+0x50/0x54 [ 9.781527] bus_probe_device+0x38/0xac [ 9.785468] deferred_probe_work_func+0x90/0xcc [ 9.790130] process_one_work+0x214/0x64c [ 9.794251] worker_thread+0x1bc/0x360 [ 9.798103] kthread+0x14c/0x220 [ 9.801424] ret_from_fork+0x10/0x20 [ 9.805103] Code: f8647842 f100005f 8b231043 9a821062 (f9400442) [ 9.811358] ---[ end trace 0000000000000000 ]--- -- With best wishes Dmitry