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The mmu mapping logic uses a different logic depending on the RAM size: if it is lower than 2GB, it uses kmem_cache_zalloc(), but if memory is bigger than that, it uses its own way to allocate memory. Yet, when freeing, it uses kmem_cache_free() for any cases. On recent Kernels, slab tracks the memory allocated on it, with causes those warnings: virt_to_cache: Object is not a Slab page! WARNING: CPU: 0 PID: 758 at mm/slab.h:475 cache_from_obj+0xab/0xf0 Modules linked in: snd_soc_sst_cht_bsw_rt5645(E) mei_hdcp(E) gpio_keys(E) intel_rapl_msr(E) intel_powerclamp(E) coretemp(E) kvm_intel(E) kvm(E) irqbypass(E) crct10dif_pclmul(E) crc32_pclmul(E) ghash_clmulni_intel(E) atomisp_ov2680(CE) intel_cstate(E) asus_nb_wmi(E) wdat_wdt(E) pcspkr(E) ath10k_pci(E) ath10k_core(E) intel_chtdc_ti_pwrbtn(E) ath(E) mac80211(E) btusb(E) joydev(E) btrtl(E) btbcm(E) btintel(E) bluetooth(E) libarc4(E) ecdh_generic(E) cfg80211(E) ecc(E) hid_sensor_gyro_3d(E) hid_sensor_accel_3d(E) hid_sensor_trigger(E) hid_sensor_iio_common(E) industrialio_triggered_buffer(E) kfifo_buf(E) industrialio(E) atomisp(CE) videobuf_vmalloc(E) videobuf_core(E) videodev(E) mc(E) snd_soc_rt5645(E) snd_soc_rl6231(E) snd_intel_sst_acpi(E) snd_intel_sst_core(E) snd_soc_sst_atom_hifi2_platform(E) snd_soc_acpi_intel_match(E) intel_hid(E) spi_pxa2xx_platform(E) snd_soc_acpi(E) snd_soc_core(E) snd_compress(E) dw_dmac(E) intel_xhci_usb_role_switch(E) int3406_thermal(E) snd_hdmi_lpe_audio(E) int3403_thermal(E) int3400_thermal(E) acpi_thermal_rel(E) snd_seq(E) intel_int0002_vgpio(E) soc_button_array(E) snd_seq_device(E) acpi_pad(E) snd_pcm(E) snd_timer(E) snd(E) soundcore(E) lpc_ich(E) mei_txe(E) mei(E) processor_thermal_device(E) intel_soc_dts_iosf(E) intel_rapl_common(E) int340x_thermal_zone(E) ip_tables(E) hid_sensor_hub(E) intel_ishtp_loader(E) intel_ishtp_hid(E) mmc_block(E) hid_multitouch(E) crc32c_intel(E) i915(E) i2c_algo_bit(E) drm_kms_helper(E) hid_asus(E) asus_wmi(E) sparse_keymap(E) rfkill(E) drm(E) intel_ish_ipc(E) intel_ishtp(E) wmi(E) video(E) i2c_hid(E) sdhci_acpi(E) sdhci(E) mmc_core(E) pwm_lpss_platform(E) pwm_lpss(E) fuse(E) CPU: 0 PID: 758 Comm: v4l_id Tainted: G C E 5.7.0-rc2+ #40 Hardware name: ASUSTeK COMPUTER INC. T101HA/T101HA, BIOS T101HA.306 04/23/2019 RIP: 0010:cache_from_obj+0xab/0xf0 Code: c3 31 c0 80 3d 1c 38 72 01 00 75 f0 48 c7 c6 20 12 06 b5 48 c7 c7 10 f3 37 b5 48 89 04 24 c6 05 01 38 72 01 01 e8 2c 99 e0 ff <0f> 0b 48 8b 04 24 eb ca 48 8b 57 58 48 8b 48 58 48 c7 c6 30 12 06 RSP: 0018:ffffb0a4c07cfb10 EFLAGS: 00010282 RAX: 0000000000000029 RBX: 0000000000000048 RCX: 0000000000000000 RDX: ffffa004fbca5b80 RSI: ffffa004fbc19cc8 RDI: ffffa004fbc19cc8 RBP: 0000000000c49000 R08: 00000000000004f7 R09: 0000000000000001 R10: 0000000000aaaaaa R11: ffffffffb50e0600 R12: ffffffffc0be0a00 R13: ffffa003f2448000 R14: 0000000000c49000 R15: ffffa003f2448000 FS: 00007f9060c9cb80(0000) GS:ffffa004fbc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000559fc55b8000 CR3: 0000000165b02000 CR4: 00000000001006f0 Call Trace: kmem_cache_free+0x19/0x180 mmu_l2_unmap+0xd1/0x100 [atomisp] mmu_unmap+0xd0/0xf0 [atomisp] hmm_bo_unbind+0x62/0xb0 [atomisp] hmm_free+0x44/0x60 [atomisp] ia_css_spctrl_unload_fw+0x30/0x50 [atomisp] ia_css_uninit+0x3a/0x90 [atomisp] atomisp_open+0x50b/0x5c0 [atomisp] v4l2_open+0x85/0xf0 [videodev] chrdev_open+0xdd/0x210 ? cdev_device_add+0xc0/0xc0 do_dentry_open+0x13a/0x380 path_openat+0xa9a/0xfe0 do_filp_open+0x75/0x100 ? __check_object_size+0x12e/0x13c ? __alloc_fd+0x44/0x150 do_sys_openat2+0x8a/0x130 __x64_sys_openat+0x46/0x70 do_syscall_64+0x5b/0xf0 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Solve it by calling free_page() directly Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.