On Thu, Sep 30, 2021 at 1:56 AM Matteo Croce <mcroce@xxxxxxxxxxxxxxxxxxx> wrote: > > From: Matteo Croce <mcroce@xxxxxxxxxxxxx> > > The generic memset is defined as a byte at time write. This is always > safe, but it's slower than a 4 byte or even 8 byte write. > > Write a generic memset which fills the data one byte at time until the > destination is aligned, then fills using the largest size allowed, > and finally fills the remaining data one byte at time. > > Signed-off-by: Matteo Croce <mcroce@xxxxxxxxxxxxx> > --- > arch/riscv/include/asm/string.h | 10 +-- > arch/riscv/kernel/Makefile | 1 - > arch/riscv/kernel/riscv_ksyms.c | 13 ---- > arch/riscv/lib/Makefile | 1 - > arch/riscv/lib/memset.S | 113 -------------------------------- > arch/riscv/lib/string.c | 41 ++++++++++++ > 6 files changed, 44 insertions(+), 135 deletions(-) > delete mode 100644 arch/riscv/kernel/riscv_ksyms.c > delete mode 100644 arch/riscv/lib/memset.S This patch causes the Linux kernel to hang if compile with LLVM/Clang. Tested on Qemu. Steps to compile with Clang: make CC=clang defconfig make CC=clang -j Boot log: [ 0.000000] Linux version 5.15.4-01003-g23eeaac40da8 (xxxxx@ubuntu) (clang version 14.0.0 (https://github.com/llvm/llvm-project 6b715e9c4d9cc00f59906d48cd57f4c767229093), GNU ld (GNU Binutils) 2.36.1) #151 SMP Thu Nov 25 18:41:47 +08 2021 [ 0.000000] OF: fdt: Ignoring memory range 0x80000000 - 0x80200000 [ 0.000000] Machine model: riscv-virtio,qemu [ 0.000000] earlycon: sbi0 at I/O port 0x0 (options '') [ 0.000000] printk: bootconsole [sbi0] enabled [ 0.000000] efi: UEFI not found. Regards Ley Foon
