RE: [PATCH] LoongArch: Make -mstrict-align be configurable

[David Laight]

From: Huacai Chen
> Sent: 02 February 2023 08:43
> 
> Introduce Kconfig option ARCH_STRICT_ALIGN to make -mstrict-align be
> configurable.
> 
> Not all LoongArch cores support h/w unaligned access, we can use the
> -mstrict-align build parameter to prevent unaligned accesses.
> 
> This option is disabled by default to optimise for performance, but you
> can enabled it manually if you want to run kernel on systems without h/w
> unaligned access support.

Should there be an associated run-time check during kernel initialisation
that a kernel compiled without -mstrict-align isn't being run on hardware
that doesn't support unaligned accesses.

It can be quite a while before you get a compiler-generated misaligned accesses.

Also isn't there a HAVE_EFFICIENT_MISALIGNED_ACCESS define that would
also need to be set correctly??

	David

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