From: Atish Patra Date: Mon, 14 Mar 2022 20:38:44 +0000 (-0700) Subject: RISC-V: Do no continue isa string parsing without correct XLEN X-Git-Tag: v5.18-rc1~121^2~2^2~1 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=3f96db125d68127ffef6fdeeb777d94ccf95c09f;p=thirdparty%2Flinux.git RISC-V: Do no continue isa string parsing without correct XLEN The isa string should begin with either rv64 or rv32. Otherwise, it is an incorrect isa string. Currently, the string parsing continues even if it doesnot begin with current XLEN. Fix this by checking if it found "rv64" or "rv32" in the beginning. Tested-by: Heiko Stuebner Signed-off-by: Atish Patra Reviewed-by: Anup Patel Signed-off-by: Palmer Dabbelt --- diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c index 3455fdfd680e0..a43c08af5f4b3 100644 --- a/arch/riscv/kernel/cpufeature.c +++ b/arch/riscv/kernel/cpufeature.c @@ -84,6 +84,7 @@ void __init riscv_fill_hwcap(void) for_each_of_cpu_node(node) { unsigned long this_hwcap = 0; DECLARE_BITMAP(this_isa, RISCV_ISA_EXT_MAX); + const char *temp; if (riscv_of_processor_hartid(node) < 0) continue; @@ -93,6 +94,7 @@ void __init riscv_fill_hwcap(void) continue; } + temp = isa; #if IS_ENABLED(CONFIG_32BIT) if (!strncmp(isa, "rv32", 4)) isa += 4; @@ -100,6 +102,9 @@ void __init riscv_fill_hwcap(void) if (!strncmp(isa, "rv64", 4)) isa += 4; #endif + /* The riscv,isa DT property must start with rv64 or rv32 */ + if (temp == isa) + continue; bitmap_zero(this_isa, RISCV_ISA_EXT_MAX); for (; *isa; ++isa) { const char *ext = isa++;