Messages in this thread Patch in this message | | | From | Yinghai Lu <> | Subject | [PATCH 37/46] x86, mm: use pfn instead of pos in split_mem_range | Date | Mon, 12 Nov 2012 13:18:33 -0800 |
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could save some bit shifting operations.
Signed-off-by: Yinghai Lu <yinghai@kernel.org> --- arch/x86/mm/init.c | 29 ++++++++++++++--------------- 1 files changed, 14 insertions(+), 15 deletions(-)
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c index a4fdf31..e430f1e 100644 --- a/arch/x86/mm/init.c +++ b/arch/x86/mm/init.c @@ -200,12 +200,11 @@ static int __meminit split_mem_range(struct map_range *mr, int nr_range, unsigned long end) { unsigned long start_pfn, end_pfn; - unsigned long pos; + unsigned long pfn; int i; /* head if not big page alignment ? */ - start_pfn = PFN_DOWN(start); - pos = PFN_PHYS(start_pfn); + pfn = start_pfn = PFN_DOWN(start); #ifdef CONFIG_X86_32 /* * Don't use a large page for the first 2/4MB of memory @@ -213,26 +212,26 @@ static int __meminit split_mem_range(struct map_range *mr, int nr_range, * and overlapping MTRRs into large pages can cause * slowdowns. */ - if (pos == 0) + if (pfn == 0) end_pfn = PFN_DOWN(PMD_SIZE); else - end_pfn = PFN_DOWN(round_up(pos, PMD_SIZE)); + end_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE)); #else /* CONFIG_X86_64 */ - end_pfn = PFN_DOWN(round_up(pos, PMD_SIZE)); + end_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE)); #endif if (end_pfn > PFN_DOWN(end)) end_pfn = PFN_DOWN(end); if (start_pfn < end_pfn) { nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); - pos = PFN_PHYS(end_pfn); + pfn = end_pfn; } /* big page (2M) range */ - start_pfn = PFN_DOWN(round_up(pos, PMD_SIZE)); + start_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE)); #ifdef CONFIG_X86_32 end_pfn = PFN_DOWN(round_down(end, PMD_SIZE)); #else /* CONFIG_X86_64 */ - end_pfn = PFN_DOWN(round_up(pos, PUD_SIZE)); + end_pfn = round_up(pfn, PFN_DOWN(PUD_SIZE)); if (end_pfn > PFN_DOWN(round_down(end, PMD_SIZE))) end_pfn = PFN_DOWN(round_down(end, PMD_SIZE)); #endif @@ -240,32 +239,32 @@ static int __meminit split_mem_range(struct map_range *mr, int nr_range, if (start_pfn < end_pfn) { nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, page_size_mask & (1<<PG_LEVEL_2M)); - pos = PFN_PHYS(end_pfn); + pfn = end_pfn; } #ifdef CONFIG_X86_64 /* big page (1G) range */ - start_pfn = PFN_DOWN(round_up(pos, PUD_SIZE)); + start_pfn = round_up(pfn, PFN_DOWN(PUD_SIZE)); end_pfn = PFN_DOWN(round_down(end, PUD_SIZE)); if (start_pfn < end_pfn) { nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, page_size_mask & ((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G))); - pos = PFN_PHYS(end_pfn); + pfn = end_pfn; } /* tail is not big page (1G) alignment */ - start_pfn = PFN_DOWN(round_up(pos, PMD_SIZE)); + start_pfn = round_up(pfn, PFN_DOWN(PMD_SIZE)); end_pfn = PFN_DOWN(round_down(end, PMD_SIZE)); if (start_pfn < end_pfn) { nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, page_size_mask & (1<<PG_LEVEL_2M)); - pos = PFN_PHYS(end_pfn); + pfn = end_pfn; } #endif /* tail is not big page (2M) alignment */ - start_pfn = PFN_DOWN(pos); + start_pfn = pfn; end_pfn = PFN_DOWN(end); nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); -- 1.7.7
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