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Andrew Jones <ajones@ventanamicro.com> says: When a DT puts zicbom in the isa string, but does not provide a block size, ALT_CMO_OP() will attempt to do cache operations on address zero since the start address will be ANDed with zero. We can't simply BUG() in riscv_init_cbom_blocksize() when we fail to find a block size because the failure will happen before logging works, leaving users to scratch their heads as to why the boot hung. Instead, ensure Zicbom is disabled and output an error which will hopefully alert people that the DT needs to be fixed. While at it, add a check that the block size is a power-of-2 too. * b4-shazam-merge: RISC-V: Ensure Zicbom has a valid block size RISC-V: Introduce riscv_isa_extension_check RISC-V: Improve use of isa2hwcap[] Link: https://lore.kernel.org/r/20221129143447.49714-1-ajones@ventanamicro.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com> |
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