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| author |   Paul Burton <paul.burton@mips.com> | 2018-07-27 18:23:21 -0700 |
|---|---|---|
| committer | Paul Burton <paul.burton@mips.com> | 2018-07-30 10:27:38 -0700 |
| commit | 0211d49e5200554eb836c9a12a247d4c11fe571c (patch) | |
| tree | f2bc769b676e4cb092f7e3c9aa1de9b6526dcbff /arch/mips | |
| parent | MIPS: Allow auto-dection of ARCH_PFN_OFFSET & PHYS_OFFSET (diff) | |
| download | linux-dev-0211d49e5200554eb836c9a12a247d4c11fe571c.tar.xz linux-dev-0211d49e5200554eb836c9a12a247d4c11fe571c.zip | |
MIPS: generic: Select MIPS_AUTO_PFN_OFFSET
Enable CONFIG_MIPS_AUTO_PFN_OFFSET for the generic platform, allowing
it to avoid wasted book-keeping for pages with addresses lower than the
physical base address of memory.
This has a minimal impact on kernel text size, with 64r6el_defconfig
gaining 0.1% in size as reported by bloat-o-meter:
add/remove: 4/1 grow/shrink: 345/13 up/down: 9017/-392 (8625)
Function old new delta
pcpu_setup_first_chunk 1444 1780 +336
pcpu_alloc_first_chunk 864 1136 +272
start_kernel 1064 1288 +224
initcall_blacklist 224 372 +148
try_fill_recv 2088 2184 +96
...
Total: Before=8457273, After=8465898, chg +0.10%
The gain for systems with large offsets to physical memory & the ability
to continue using generic kernels on such systems seems well worth this
small cost.
Signed-off-by: Paul Burton <paul.burton@mips.com>
Suggested-by: Vladimir Kondratiev <vladimir.kondratiev@intel.com>
Patchwork: https://patchwork.linux-mips.org/patch/20049/
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Diffstat (limited to 'arch/mips')
| -rw-r--r-- | arch/mips/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index fbf7f678e856..c95eb5ad0d96 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -98,6 +98,7 @@ config MIPS_GENERIC select HW_HAS_PCI select IRQ_MIPS_CPU select LIBFDT + select MIPS_AUTO_PFN_OFFSET select MIPS_CPU_SCACHE select MIPS_GIC select MIPS_L1_CACHE_SHIFT_7 |