Messages in this thread | | | Date | Wed, 14 Jun 2023 07:49:17 -0700 (PDT) | Subject | Re: [PATCH v2 0/4] riscv: enable HAVE_LD_DEAD_CODE_DATA_ELIMINATION | From | Palmer Dabbelt <> |
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On Tue, 23 May 2023 09:54:58 PDT (-0700), jszhang@kernel.org wrote: > When trying to run linux with various opensource riscv core on > resource limited FPGA platforms, for example, those FPGAs with less > than 16MB SDRAM, I want to save mem as much as possible. One of the > major technologies is kernel size optimizations, I found that riscv > does not currently support HAVE_LD_DEAD_CODE_DATA_ELIMINATION, which > passes -fdata-sections, -ffunction-sections to CFLAGS and passes the > --gc-sections flag to the linker. > > This not only benefits my case on FPGA but also benefits defconfigs. > Here are some notable improvements from enabling this with defconfigs: > > nommu_k210_defconfig: > text data bss dec hex > 1112009 410288 59837 1582134 182436 before > 962838 376656 51285 1390779 1538bb after > > rv32_defconfig: > text data bss dec hex > 8804455 2816544 290577 11911576 b5c198 before > 8692295 2779872 288977 11761144 b375f8 after > > defconfig: > text data bss dec hex > 9438267 3391332 485333 13314932 cb2b74 before > 9285914 3350052 483349 13119315 c82f53 after > > patch1 and patch2 are clean ups. > patch3 fixes a typo. > patch4 finally enable HAVE_LD_DEAD_CODE_DATA_ELIMINATION for riscv. > > NOTE: Zhangjin Wu firstly sent out a patch to enable dead code > elimination for riscv several months ago, I didn't notice it until > yesterday. Although it missed some preparations and some sections's > keeping, he is the first person to enable this feature for riscv. To > ease merging, this series take his patch into my entire series and > makes patch4 authored by him after getting his ack to reflect > the above fact. > > Since v1: > - collect Reviewed-by, Tested-by tag > - Make patch4 authored by Zhangjin Wu, add my co-developed-by tag > > Jisheng Zhang (3): > riscv: move options to keep entries sorted > riscv: vmlinux-xip.lds.S: remove .alternative section > vmlinux.lds.h: use correct .init.data.* section name > > Zhangjin Wu (1): > riscv: enable HAVE_LD_DEAD_CODE_DATA_ELIMINATION > > arch/riscv/Kconfig | 13 +- > arch/riscv/kernel/vmlinux-xip.lds.S | 6 - > arch/riscv/kernel/vmlinux.lds.S | 6 +- > include/asm-generic/vmlinux.lds.h | 2 +- > 4 files changed, 11 insertions(+), 16 deletions(-)
Do you have a base commit for this? It's not applying to 6.4-rc1 and the patchwork bot couldn't find one either.
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