Re: [PATCH v2 5/9] powerpc/vmlinux.lds: Align __init_begin to 16M

On Mon, 5 Jun 2017 08:42:40 +1000
Balbir Singh [off-list ref] wrote:

On Sun, Jun 4, 2017 at 2:22 PM, Nicholas Piggin [off-list ref] wrote:

quoted

On Sat,  3 Jun 2017 17:18:39 +1000
Balbir Singh [off-list ref] wrote:
 

quoted

For CONFIG_STRICT_KERNEL_RWX align __init_begin to 16M.
We use 16M since its the larger of 2M on radix and 16M
on hash for our linear mapping. The plan is to have
.text, .rodata and everything upto __init_begin marked
as RX. Note we still have executable read only data.
We could further align read only data to another 16M
boundary, but then the linker starts using stubs and
that breaks our assembler code in head_64.S  

Is this still the case with powerpc next?
 

Sorry, no, I was on linux-next for testing, but I think your linker
stub patches went in very recently. I'll rebase on top and test,

That would be good. I'd like to make sure the linker stub workaround
does work for your case.

but I am not sure if I want two 16M alignments and bloat the size
of vmlinux. But I'll double check what happens

Maybe it could be an option.

Thanks,
Nick