ACK: [SRU][P][PATCH 0/1] UBUNTU: SAUCE: powerpc64/ftrace: fail to load i40e driver at boot time (LP: #2104297)

[Kuba Pawlak]

On 4.04.2025 10:11, Massimiliano Pellizzer wrote:
> BugLink: https://bugs.launchpad.net/bugs/2104297
>
> [ Impact ]
>
> In ppc64el kernels, loading modules without any
> __patchable_function_entries section would fail due to a
> zero size allocation of executable memory for ftrace trampolines.
> This causes boot failures when trying to boot the kernel on IBM Power 9
> systems. In particular becasue IBM Power 9 tries to load i40e at boot
> time, which fails.
>
> The bug was introduced by commit eec37961a56a which landed in v6.13-rc1,
> which assumed all modules have traceable functions.
>
> [ Fix ]
>
> Apply the following patch:
> - https://lore.kernel.org/all/wlscshbqan2svtqkz5xc6v47tzndfnsvge7h4lbfn67zoplekl@elt2oxwhrp6f/T/
> which has not landed in linux-next yet.
>
> [ Test Plan ]
>
> Compile and boot test the kernel on a Power 9 bare metal machine.
>
> [ Where problems could occur ]
>
> The patch simply removes an if branch which handles (incorrectly) errors during
> module loading on ppc64 systems. The regression potential therefore is
> very low.
>
>
> Massimiliano Pellizzer (1):
>    UBUNTU: SAUCE: powerpc64/ftrace: fix module loading without patchable
>      function entries
>
>   arch/powerpc/kernel/module_64.c | 4 ----
>   1 file changed, 4 deletions(-)
>
Acked-by: Kuba Pawlak <kuba.pawlak at canonical.com>
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