Move building of fast lookup table from boot to sorttable tool. This saves us 6380us boot time on Intel(R) Xeon(R) CPU E5-2682 v4 @ 2.50GHz with cores. It adds a little more than 7ms to boot time when testing on the same CPU.
Kernel initialization unwind_init() cannot be removed because lookup_num_blocks is still needed. Huaixin Chang (3): scripts/sorttable: Change section type of orc_lookup to SHT_PROGBITS scripts/sorttable: Build orc fast lookup table via sorttable tool x86/unwind/orc: Simplify unwind_init() for x86 boot arch/x86/kernel/unwind_orc.c | 41 +--------------- include/asm-generic/vmlinux.lds.h | 2 + scripts/sorttable.h | 99 ++++++++++++++++++++++++++++++++++++--- 3 files changed, 96 insertions(+), 46 deletions(-) -- 2.14.4.44.g2045bb6
