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riscv: vector: add a comment when calling riscv_setup_vsize()

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The function would fail when it detects the calling hart's vlen doesn't
match the first one's. The boot hart is the first hart calling this
function during riscv_fill_hwcap, so it is impossible to fail here. Add
a comment about this behavior.

Signed-off-by: Andy Chiu <andy.chiu@sifive.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240510-zve-detection-v5-1-0711bdd26c12@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Andy Chiu 2024-05-10 00:26:51 +08:00 committed by Palmer Dabbelt
parent 1613e604df
commit 77afe3e514
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arch/riscv/kernel/cpufeature.c
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@ -687,6 +687,9 @@ void __init riscv_fill_hwcap(void)
}
if (elf_hwcap & COMPAT_HWCAP_ISA_V) {
/*
* This cannot fail when called on the boot hart
*/
riscv_v_setup_vsize();
/*
* ISA string in device tree might have 'v' flag, but