Re: [PATCH v2 1/2] powerpc/bug: Remove specific powerpc BUG_ON() and WARN_ON() on PPC32

Michael Ellerman
2021-08-18T13:46:13Z

On Tue, 13 Apr 2021 16:38:09 +0000 (UTC), Christophe Leroy wrote:
> powerpc BUG_ON() and WARN_ON() are based on using twnei instruction.
>
> For catching simple conditions like a variable having value 0, this
> is efficient because it does the test and the trap at the same time.
> But most conditions used with BUG_ON or WARN_ON are more complex and
> forces GCC to format the condition into a 0 or 1 value in a register.
> This will usually require 2 to 3 instructions.
>
> [...]

Applied to powerpc/next.

[1/2] powerpc/bug: Remove specific powerpc BUG_ON() and WARN_ON() on PPC32
https://git.kernel.org/powerpc/c/db87a7199229b75c9996bf78117eceb81854fce2
[2/2] powerpc/bug: Provide better flexibility to WARN_ON/__WARN_FLAGS() with asm goto
https://git.kernel.org/powerpc/c/1e688dd2a3d6759d416616ff07afc4bb836c4213

cheers