Re: [PATCH v3] powerpc/lockdep: fix a false positive warning

[Michael Ellerman]

Hi Qian,

Sorry I haven't replied sooner, I've been travelling.

Qian Cai <cai@xxxxxx> writes:
> The commit 108c14858b9e ("locking/lockdep: Add support for dynamic
> keys") introduced a boot warning on powerpc below, because since the
> commit 2d4f567103ff ("KVM: PPC: Introduce kvm_tmp framework") adds
> kvm_tmp[] into the .bss section and then free the rest of unused spaces
> back to the page allocator.

Thanks for debugging this, but I'd like to fix it differently.

kvm_tmp has caused trouble before, with kmemleak, and it can also cause
trouble with STRICT_KERNEL_RWX, so I'd like to change how it's done,
rather than doing more hacks for it.

It should just be a page in text that we use if needed, and don't free,
which should avoid all these problems.

I'll try and get that done and posted soon.

cheers