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LoongArch: Update help info of ARCH_STRICT_ALIGN

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commit f5003098e2f337d8e8a87dc636250e3fa978d9ad upstream.

Loongson-3A6000 and 3C6000 CPUs also support unaligned memory access, so
the current description is out of date to some extent.

Actually, all of Loongson-3 series processors based on LoongArch support
unaligned memory access, this hardware capability is indicated by the bit
20 (UAL) of CPUCFG1 register, update the help info to reflect the reality.

Cc: stable@vger.kernel.org
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tiezhu Yang
2025-09-18 19:43:42 +08:00
committed by Greg Kroah-Hartman
parent 90c0ffa1e0
commit fb6ee62d30
1 changed files with 6 additions and 2 deletions
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8
arch/loongarch/Kconfig
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@@ -503,10 +503,14 @@ config ARCH_STRICT_ALIGN
-mstrict-align build parameter to prevent unaligned accesses.
CPUs with h/w unaligned access support:
Loongson-2K2000/2K3000/3A5000/3C5000/3D5000.
Loongson-2K2000/2K3000 and all of Loongson-3 series processors
based on LoongArch.
CPUs without h/w unaligned access support:
Loongson-2K500/2K1000.
Loongson-2K0300/2K0500/2K1000.
If you want to make sure whether to support unaligned memory access
on your hardware, please read the bit 20 (UAL) of CPUCFG1 register.
This option is enabled by default to make the kernel be able to run
on all LoongArch systems. But you can disable it manually if you want