[1/5] powerpc/asm: Add a patch_site macro & helpers for patching instructions

[Michael Ellerman]

On Mon, 2018-07-23 at 15:07:52 UTC, Michael Ellerman wrote:
> Add a macro and some helper C functions for patching single asm
> instructions.
> 
> The gas macro means we can do something like:
> 
>   1:	nop
>   	patch_site 1b, patch__foo
> 
> Which is less visually distracting than defining a GLOBAL symbol at 1,
> and also doesn't pollute the symbol table which can confuse eg. perf.
> 
> These are obviously similar to our existing feature sections, but are
> not automatically patched based on CPU/MMU features, rather they are
> designed to be manually patched by C code at some arbitrary point.
> 
> Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>

Series applied to powerpc next.

https://git.kernel.org/powerpc/c/06d0bbc6d0f56dacac3a79900e9a9a

cheers