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linux-stable/include
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Lyude Paul 319e53f155 drm/panic: Fix uninitialized spinlock acquisition with CONFIG_DRM_PANIC=n 
It turns out that if you happen to have a kernel config where
CONFIG_DRM_PANIC is disabled and spinlock debugging is enabled, along with
KMS being enabled - we'll end up trying to acquire an uninitialized
spin_lock with drm_panic_lock() when we try to do a commit:

  rvkms rvkms.0: [drm:drm_atomic_commit] committing 0000000068d2ade1
  INFO: trying to register non-static key.
  The code is fine but needs lockdep annotation, or maybe
  you didn't initialize this object before use?
  turning off the locking correctness validator.
  CPU: 4 PID: 1347 Comm: modprobe Not tainted 6.10.0-rc1Lyude-Test+ #272
  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS edk2-20240524-3.fc40 05/24/2024
  Call Trace:
   <TASK>
   dump_stack_lvl+0x77/0xa0
   assign_lock_key+0x114/0x120
   register_lock_class+0xa8/0x2c0
   __lock_acquire+0x7d/0x2bd0
   ? __vmap_pages_range_noflush+0x3a8/0x550
   ? drm_atomic_helper_swap_state+0x2ad/0x3a0
   lock_acquire+0xec/0x290
   ? drm_atomic_helper_swap_state+0x2ad/0x3a0
   ? lock_release+0xee/0x310
   _raw_spin_lock_irqsave+0x4e/0x70
   ? drm_atomic_helper_swap_state+0x2ad/0x3a0
   drm_atomic_helper_swap_state+0x2ad/0x3a0
   drm_atomic_helper_commit+0xb1/0x270
   drm_atomic_commit+0xaf/0xe0
   ? __pfx___drm_printfn_info+0x10/0x10
   drm_client_modeset_commit_atomic+0x1a1/0x250
   drm_client_modeset_commit_locked+0x4b/0x180
   drm_client_modeset_commit+0x27/0x50
   __drm_fb_helper_restore_fbdev_mode_unlocked+0x76/0x90
   drm_fb_helper_set_par+0x38/0x40
   fbcon_init+0x3c4/0x690
   visual_init+0xc0/0x120
   do_bind_con_driver+0x409/0x4c0
   do_take_over_console+0x233/0x280
   do_fb_registered+0x11f/0x210
   fbcon_fb_registered+0x2c/0x60
   register_framebuffer+0x248/0x2a0
   __drm_fb_helper_initial_config_and_unlock+0x58a/0x720
   drm_fbdev_generic_client_hotplug+0x6e/0xb0
   drm_client_register+0x76/0xc0
   _RNvXs_CsHeezP08sTT_5rvkmsNtB4_5RvkmsNtNtCs1cdwasc6FUb_6kernel8platform6Driver5probe+0xed2/0x1060 [rvkms]
   ? _RNvMs_NtCs1cdwasc6FUb_6kernel8platformINtB4_7AdapterNtCsHeezP08sTT_5rvkms5RvkmsE14probe_callbackBQ_+0x2b/0x70 [rvkms]
   ? acpi_dev_pm_attach+0x25/0x110
   ? platform_probe+0x6a/0xa0
   ? really_probe+0x10b/0x400
   ? __driver_probe_device+0x7c/0x140
   ? driver_probe_device+0x22/0x1b0
   ? __device_attach_driver+0x13a/0x1c0
   ? __pfx___device_attach_driver+0x10/0x10
   ? bus_for_each_drv+0x114/0x170
   ? __device_attach+0xd6/0x1b0
   ? bus_probe_device+0x9e/0x120
   ? device_add+0x288/0x4b0
   ? platform_device_add+0x75/0x230
   ? platform_device_register_full+0x141/0x180
   ? rust_helper_platform_device_register_simple+0x85/0xb0
   ? _RNvMs2_NtCs1cdwasc6FUb_6kernel8platformNtB5_6Device13create_simple+0x1d/0x60
   ? _RNvXs0_CsHeezP08sTT_5rvkmsNtB5_5RvkmsNtCs1cdwasc6FUb_6kernel6Module4init+0x11e/0x160 [rvkms]
   ? 0xffffffffc083f000
   ? init_module+0x20/0x1000 [rvkms]
   ? kernfs_xattr_get+0x3e/0x80
   ? do_one_initcall+0x148/0x3f0
   ? __lock_acquire+0x5ef/0x2bd0
   ? __lock_acquire+0x5ef/0x2bd0
   ? __lock_acquire+0x5ef/0x2bd0
   ? put_cpu_partial+0x51/0x1d0
   ? lock_acquire+0xec/0x290
   ? put_cpu_partial+0x51/0x1d0
   ? lock_release+0xee/0x310
   ? put_cpu_partial+0x51/0x1d0
   ? fs_reclaim_acquire+0x69/0xf0
   ? lock_acquire+0xec/0x290
   ? fs_reclaim_acquire+0x69/0xf0
   ? kfree+0x22f/0x340
   ? lock_release+0xee/0x310
   ? kmalloc_trace_noprof+0x48/0x340
   ? do_init_module+0x22/0x240
   ? kmalloc_trace_noprof+0x155/0x340
   ? do_init_module+0x60/0x240
   ? __se_sys_finit_module+0x2e0/0x3f0
   ? do_syscall_64+0xa4/0x180
   ? syscall_exit_to_user_mode+0x108/0x140
   ? do_syscall_64+0xb0/0x180
   ? vma_end_read+0xd0/0xe0
   ? do_user_addr_fault+0x309/0x640
   ? clear_bhb_loop+0x45/0xa0
   ? clear_bhb_loop+0x45/0xa0
   ? clear_bhb_loop+0x45/0xa0
   ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
   </TASK>

Fix this by stubbing these macros out when this config option isn't
enabled, along with fixing the unused variable warning that introduces.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Fixes: e2a1cda3e0 ("drm/panic: Add drm panic locking")
Cc: <stable@vger.kernel.org> # v6.10+
Link: https://patchwork.freedesktop.org/patch/msgid/20240916230103.611490-1-lyude@redhat.com
2024-09-16 19:03:29 -04:00
..
acpi ACPI: video: Add Dell UART backlight controller detection 2024-08-19 15:58:35 +02:00
asm-generic runtime constants: deal with old decrepit linkers 2024-08-03 08:38:45 -07:00
clocksource
crypto
drm drm/panic: Fix uninitialized spinlock acquisition with CONFIG_DRM_PANIC=n 2024-09-16 19:03:29 -04:00
dt-bindings I3C for 6.11 2024-07-27 10:53:06 -07:00
keys
kunit kunit: Fix missing kerneldoc comment 2024-09-05 14:29:10 -06:00
kvm
linux Merge drm/drm-next into drm-misc-next 2024-09-11 09:48:49 +02:00
math-emu
media
memory
misc
net net: mana: Fix error handling in mana_create_txq/rxq's NAPI cleanup 2024-09-04 11:50:04 +01:00
pcmcia
ras mm/memory-failure: remove obsolete MF_MSG_DIFFERENT_COMPOUND 2024-07-12 15:52:22 -07:00
rdma RDMA/core: Introduce "name_assign_type" for an IB device 2024-07-04 07:59:53 +03:00
rv
scsi scsi: core: Fix the return value of scsi_logical_block_count() 2024-08-16 21:02:06 -04:00
soc net: mscc: ocelot: treat 802.1ad tagged traffic as 802.1Q-untagged 2024-08-16 09:59:32 +01:00
sound ASoC: Fixes for v6.11 2024-09-06 08:24:56 +02:00
target
trace rpcrdma: Trace connection registration and unregistration 2024-08-19 11:50:41 -04:00
uapi Merge drm/drm-next into drm-misc-next 2024-09-11 09:48:49 +02:00
ufs scsi: ufs: core: Add a quirk for handling broken LSDBS field in controller capabilities register 2024-08-16 21:09:17 -04:00
vdso Random number generator updates for Linux 6.11-rc1. 2024-07-24 10:29:50 -07:00
video
xen Driver core changes for 6.11-rc1 2024-07-25 10:42:22 -07:00