From 0211d49e5200554eb836c9a12a247d4c11fe571c Mon Sep 17 00:00:00 2001 From: Paul Burton Date: Fri, 27 Jul 2018 18:23:21 -0700 Subject: [PATCH] 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 Suggested-by: Vladimir Kondratiev Patchwork: https://patchwork.linux-mips.org/patch/20049/ Cc: James Hogan Cc: Ralf Baechle Cc: linux-mips@linux-mips.org --- arch/mips/Kconfig | 1 + 1 file changed, 1 insertion(+) 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 -- 2.30.2