6.17-stable review patch. If anyone has any objections, please let me know.
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From: Paul Walmsley pjw@kernel.org
commit 2dc99ea2727640b2fe12f9aa0e38ea2fc3cbb92d upstream.
In has_thead_homogeneous_vlenb(), smatch detected that the vlenb variable could be used while uninitialized. It appears that this could happen if no CPUs described in DT have the "thead,vlenb" property.
Fix by initializing vlenb to 0, which will keep thead_vlenb_of set to 0 (as it was statically initialized). This in turn will cause riscv_v_setup_vsize() to fall back to CSR probing - the desired result if thead,vlenb isn't provided in the DT data.
While here, fix a nearby comment typo.
Cc: stable@vger.kernel.org Cc: Charlie Jenkins charlie@rivosinc.com Fixes: 377be47f90e41 ("riscv: vector: Use vlenb from DT for thead") Signed-off-by: Paul Walmsley pjw@kernel.org Link: https://lore.kernel.org/r/22674afb-2fe8-2a83-1818-4c37bd554579@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/riscv/kernel/cpufeature.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/arch/riscv/kernel/cpufeature.c +++ b/arch/riscv/kernel/cpufeature.c @@ -932,9 +932,9 @@ static int has_thead_homogeneous_vlenb(v { int cpu; u32 prev_vlenb = 0; - u32 vlenb; + u32 vlenb = 0;
- /* Ignore thead,vlenb property if xtheavector is not enabled in the kernel */ + /* Ignore thead,vlenb property if xtheadvector is not enabled in the kernel */ if (!IS_ENABLED(CONFIG_RISCV_ISA_XTHEADVECTOR)) return 0;