Public bug reported:
[Impact]
Linux 5.11 removed TIF_IA32 with commit 8d71d2bf6efec ("x86: Reclaim
TIF_IA32 and TIF_X32"), this flag is used by openafs to determine if the
task is handling a syscall request from a 32 bit process, so building
against a 5.11 kernel results in a build failure.
[Test case]
Install openafs-modules-dkms.
[Fix]
Apply the following openafs' upstream commits:
32cc6b0796495e596262d84c428172a511f757c4 ("Linux: Refactor test for 32bit
compat")
78ef922612bef5f5fd6904896e84b9d2ea802404 ("Linux 5.11: Test 32bit compat with
in_compat_syscall")
In this way we are not relying anymore on TIF_IA32 and instead we use
the function in_compat_syscall() introdueed in Linux 4.6, as a preferred
method to determine if a syscall needs to handle a compatible call
(e.g., 32-bit binaries).
[Regression potential]
This change might break the build of kernels that are missing
in_compat_syscall(), but this is unlikely to happen with recent kernels,
since this function has been introduced in Linux 4.6 (and it's available
on all architectures).
** Affects: openafs (Ubuntu)
Importance: Undecided
Status: New
** Affects: openafs (Ubuntu Hirsute)
Importance: Undecided
Status: New
** Also affects: openafs (Ubuntu Hirsute)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1915854
Title:
openafs-modules-dkms: build failure on hirsute with kernel 5.11
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