Re: PPC code-patching calls tlb flush with irqs disabled?

On Wed, Nov 19, 2025, at 11:40, Christophe Leroy wrote:

Le 19/11/2025 à 08:38, Christian Melki a écrit :

We don't want an interrupt in the middle of a patching sequence were the 
code would be in a wobbly situation.
We also don't want other parts of kelnel being able to access that 
temporary RW mapping of kernel code until it is unmapped.

How can we achieve this goal if we can't flush TLBs while IRQs are 
disabled ?

On 32-bit arm, we have the same problem, and AFAICT the workaround
here is to use stop_machine() as part of patch_text(), to
ensure a local TLB flush is sufficient.

   Arnd