Public bug reported:

    SRU Justification

    Impact:
       The upstream process for stable tree updates is quite similar
       in scope to the Ubuntu SRU process, e.g., each patch has to
       demonstrably fix a bug, and each patch is vetted by upstream
       by originating either directly from a mainline/stable Linux tree or
       a minimally backported form of that patch. The following upstream
       stable patches should be included in the Ubuntu kernel:

       v5.15.4 upstream stable release
       from git://git.kernel.org/

            
Linux 5.15.4
Revert "ACPI: scan: Release PM resources blocked by unused objects"
thermal: Fix NULL pointer dereferences in of_thermal_ functions
perf/core: Avoid put_page() when GUP fails
PCI: Add MSI masking quirk for Nvidia ION AHCI
PCI/MSI: Deal with devices lying about their MSI mask capability
parisc/entry: fix trace test in syscall exit path
Bluetooth: btusb: Add support for TP-Link UB500 Adapter
loop: Use blk_validate_block_size() to validate block size
block: Add a helper to validate the block size
fortify: Explicitly disable Clang support
btrfs: zoned: allow preallocation for relocation inodes
btrfs: check for relocation inodes on zoned btrfs in should_nocow
btrfs: zoned: use regular writes for relocation
btrfs: zoned: only allow one process to add pages to a relocation inode
btrfs: zoned: add a dedicated data relocation block group
btrfs: introduce btrfs_is_data_reloc_root
KVM: Fix steal time asm constraints
Revert "drm: fb_helper: fix CONFIG_FB dependency"
Revert "drm: fb_helper: improve CONFIG_FB dependency"
string: uninline memcpy_and_pad

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed

** Affects: linux (Ubuntu Jammy)
     Importance: Undecided
         Status: Confirmed


** Tags: kernel-stable-tracking-bug

** Changed in: linux (Ubuntu)
       Status: New => Confirmed

** Tags added: kernel-stable-tracking-bug

** Also affects: linux (Ubuntu Jammy)
   Importance: Undecided
       Status: Confirmed

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https://bugs.launchpad.net/bugs/1951820

Title:
  Jammy update: v5.15.4 upstream stable release

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Jammy:
  Confirmed

Bug description:
  
      SRU Justification

      Impact:
         The upstream process for stable tree updates is quite similar
         in scope to the Ubuntu SRU process, e.g., each patch has to
         demonstrably fix a bug, and each patch is vetted by upstream
         by originating either directly from a mainline/stable Linux tree or
         a minimally backported form of that patch. The following upstream
         stable patches should be included in the Ubuntu kernel:

         v5.15.4 upstream stable release
         from git://git.kernel.org/

              
  Linux 5.15.4
  Revert "ACPI: scan: Release PM resources blocked by unused objects"
  thermal: Fix NULL pointer dereferences in of_thermal_ functions
  perf/core: Avoid put_page() when GUP fails
  PCI: Add MSI masking quirk for Nvidia ION AHCI
  PCI/MSI: Deal with devices lying about their MSI mask capability
  parisc/entry: fix trace test in syscall exit path
  Bluetooth: btusb: Add support for TP-Link UB500 Adapter
  loop: Use blk_validate_block_size() to validate block size
  block: Add a helper to validate the block size
  fortify: Explicitly disable Clang support
  btrfs: zoned: allow preallocation for relocation inodes
  btrfs: check for relocation inodes on zoned btrfs in should_nocow
  btrfs: zoned: use regular writes for relocation
  btrfs: zoned: only allow one process to add pages to a relocation inode
  btrfs: zoned: add a dedicated data relocation block group
  btrfs: introduce btrfs_is_data_reloc_root
  KVM: Fix steal time asm constraints
  Revert "drm: fb_helper: fix CONFIG_FB dependency"
  Revert "drm: fb_helper: improve CONFIG_FB dependency"
  string: uninline memcpy_and_pad

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