On Wed, Dec 19, 2018 at 8:37 PM Anup Patel <a...@brainfault.org> wrote: > > The objcopy only emits loadable sections when creating flat kernel > Image. To have minimal possible size of flat kernel Image, we should > have all non-loadable sections after loadable sections. > > Currently, execption table section (loadable section) is after BSS > section (non-loadable section) in the RISC-V vmlinux.lds.S. This > is not optimal for having minimal flat kernel Image size hence this > patch makes BSS section as the last section in RISC-V vmlinux.lds.S. > > In addition, we make BSS section aligned to 16byte instead of PAGE > aligned which further reduces flat kernel Image size by few KBs. > > The flat kernel Image size of Linux-4.20-rc4 using GCC 8.2.0 is > 8819980 bytes with current RISC-V vmlinux.lds.S and it reduces to > 7991740 bytes with this patch applied. In summary, this patch reduces > Linux-4.20-rc4 flat kernel Image size by 809 KB. > > Signed-off-by: Anup Patel <a...@brainfault.org> > --- > > Changes since v1: > - Introduce MAX_BYTES_PER_LONG define and use it in-place of > 0x10 magic value > > arch/riscv/kernel/vmlinux.lds.S | 8 ++++++-- > 1 file changed, 6 insertions(+), 2 deletions(-) >
Reviewed-by: Bin Meng <bmeng...@gmail.com>
