** Description changed:

  [ Test Plan ]
  
  1. Install mainline kernel headers of following versions from 
https://kernel.ubuntu.com/mainline/:
     - v6.5.x
     - v5.17.x
+    - v5.12.5
  
  ========== original bug report ==========
  
  * v6.3-rc1 commit e047c5eaa763 ("kunit: Expose 'static stub' API to
  redirect functions") introduced `include/kunit/static_stub.h`, and
  defines KUNIT_STATIC_STUB_REDIRECT when CONFIG_KUNIT is enabled, and
  KUNIT_TRIGGER_STATIC_STUB otherwise, only when v6.6-rc1 commit
  582eb3aeed2d ("kunit: replace KUNIT_TRIGGER_STATIC_STUB maro with
  KUNIT_STATIC_STUB_REDIRECT") unified both cases.
  
  * 5.17.15:
  
  v5.16-rc1 commit 8587ca6f34152 ("mm: move kvmalloc-related functions to
  slab.h") moved away the function from linux/mm.h to linux/slab.h.
  
+ * v5.12.9:
+ 
+ v4.17-rc1 commit 3c8ba0d61d04 ("kernel.h: Retain constant expression
+ output for max()/min()") adds __is_constexpr to
+ `include/linux/kernel.h`, and was then moved to `include/linux/minmax.h`
+ in v5.10-rc1 commit b296a6d53339 ("kernel.h: split out min()/max() et
+ al. helpers"). However, in v5.13-rc3 commit f747e6667ebb ("linux/bits.h:
+ fix compilation error with GENMASK"), which was also backported to
+ v5.12.9 and v5.10.42, __is_constexpr was moved into
+ `include/linux/const.h`.
+ 
  * 5.7.19:
  
  v5.8-rc1 commit d9d200bcebc1f ("dma-mapping: add generic helpers for
  mapping sgtable objects") added `dma_unmap_sgtable` and more helpers,
  and had been backported to v5.4.233. backport-iwlwifi has wrong version
  guards about this.
  
  v5.8-rc1 commit 709d6d73c7561 ("scatterlist: add generic wrappers for
  iterating over sgtable objects") added `for_each_sgtable_sg` helper
  macros, and had been backported to v5.4.233. backport-iwlwifi has wrong
  version guards about this.

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https://bugs.launchpad.net/bugs/2095143

Title:
  Accumulative fixes for build failures against previous stable kernel
  releases

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