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Date:   Wed, 29 Nov 2017 13:38:25 -0500 (EST)
From:   David Miller <>
Subject: Re: [PATCH 1/2] sparc32,leon: Build with -mcpu=leon3 for SPARC_LEON

From: Andreas Larsson <>
Date: Tue, 14 Nov 2017 15:03:42 +0100

> Apart from using LEON3 instruction timing it allows for usage of the
> CASA instruction.
> Signed-off-by: Andreas Larsson <>

Up until this point the LEON kconfig option is largely passive.

All of the sparc_cpu_type logic drives what parts of the kernel are
used based upon the run-time detected cpu type.

But with this change, it completely breaks the 32-bit sparc kernel
on any non-Leon processor.

I wish you would reconsider this approach, and instead do hardcoded
assembler instruction opcodes to use "casa" in assembler, and run
time detect CAS support in the 32-bit cpu.

Thank you.

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