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| author | Palmer Dabbelt <palmer@rivosinc.com> | 2023-06-25 16:24:06 -0700 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2023-07-01 07:38:19 -0700 |
| commit | 782aefb177e8932c558ae55f64206ded7fe1292f (patch) | |
| tree | c078618678d7b35fa5c9299f361c3eb98ae96214 /include | |
| parent | e50db34efdc8cac2f17b8f5d32fddd7b58914ce6 (diff) | |
| parent | f7584322e4fef794b290e5fdb290fa92a925236e (diff) | |
Merge patch series "riscv: enable HAVE_LD_DEAD_CODE_DATA_ELIMINATION"
Jisheng Zhang <jszhang@kernel.org> says:
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.
* b4-shazam-merge:
riscv: disable HAVE_LD_DEAD_CODE_DATA_ELIMINATION for LLD
riscv: enable HAVE_LD_DEAD_CODE_DATA_ELIMINATION
vmlinux.lds.h: use correct .init.data.* section name
riscv: vmlinux-xip.lds.S: remove .alternative section
riscv: move options to keep entries sorted
riscv: Fix orphan section warnings caused by kernel/pi
Link: https://lore.kernel.org/r/20230523165502.2592-1-jszhang@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-generic/vmlinux.lds.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index da9e5629ea43..e8f276fb1b11 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -688,7 +688,7 @@ /* init and exit section handling */ #define INIT_DATA \ KEEP(*(SORT(___kentry+*))) \ - *(.init.data init.data.*) \ + *(.init.data .init.data.*) \ MEM_DISCARD(init.data*) \ KERNEL_CTORS() \ MCOUNT_REC() \ |