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| author |   Nicholas Piggin <npiggin@gmail.com> | 2018-05-09 23:00:01 +1000 |
|---|---|---|
| committer |   Masahiro Yamada <yamada.masahiro@socionext.com> | 2018-05-17 22:45:01 +0900 |
| commit | 4c1d9bb0b5d3c0b3468ac8e68a05972eb957630f (patch) | |
| tree | 7429c088567c6a097c999ac0ee896b4e1e55f545 /arch/powerpc/Kconfig | |
| parent | kbuild: Allow LD_DEAD_CODE_DATA_ELIMINATION to be selectable if enabled (diff) | |
| download | linux-dev-4c1d9bb0b5d3c0b3468ac8e68a05972eb957630f.tar.xz linux-dev-4c1d9bb0b5d3c0b3468ac8e68a05972eb957630f.zip | |
powerpc: Allow LD_DEAD_CODE_DATA_ELIMINATION to be selected
This requires further changes to linker script to KEEP some tables
and wildcard compiler generated sections into the right place. This
includes pp32 modifications from Christophe Leroy.
When compiling powernv_defconfig with this option, the resulting
kernel is almost 400kB smaller (and still boots):
text data bss dec filename
11827621 4810490 1341080 17979191 vmlinux
11752437 4598858 1338776 17690071 vmlinux.dcde
Mathieu's numbers for custom Mac Mini G4 config has almost 200kB
saving. It also had some increase in vmlinux size for as-yet
unknown reasons.
text data bss dec filename
7461457 2475122 1428064 11364643 vmlinux
7386425 2364370 1425432 11176227 vmlinux.dcde
Tested-by: Christophe Leroy <christophe.leroy@c-s.fr> [8xx]
Tested-by: Mathieu Malaterre <malat@debian.org> [32-bit powermac]
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Diffstat (limited to 'arch/powerpc/Kconfig')
| -rw-r--r-- | arch/powerpc/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index c32a181a7cbb..ee6dbe2efc8b 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -205,6 +205,7 @@ config PPC select HAVE_KPROBES select HAVE_KPROBES_ON_FTRACE select HAVE_KRETPROBES + select HAVE_LD_DEAD_CODE_DATA_ELIMINATION select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS select HAVE_MEMBLOCK select HAVE_MEMBLOCK_NODE_MAP |