[PATCH v2 3/3] arm: extend pfn_valid to take into accound freed memory map alignment
From: Mike Rapoport <rppt@kernel.org>
Date: 2021-05-19 14:16:26
Also in:
linux-mm, lkml
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
From: Mike Rapoport <redacted> When unused memory map is freed the preserved part of the memory map is extended to match pageblock boundaries because lots of core mm functionality relies on homogeneity of the memory map within pageblock boundaries. Since pfn_valid() is used to check whether there is a valid memory map entry for a PFN, make it return true also for PFNs that have memory map entries even if there is no actual memory populated there. Signed-off-by: Mike Rapoport <redacted> --- arch/arm/mm/init.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 9d4744a632c6..6162a070a410 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c@@ -125,11 +125,22 @@ static void __init zone_sizes_init(unsigned long min, unsigned long max_low, int pfn_valid(unsigned long pfn) { phys_addr_t addr = __pfn_to_phys(pfn); + unsigned long pageblock_size = PAGE_SIZE * pageblock_nr_pages; if (__phys_to_pfn(addr) != pfn) return 0; - return memblock_is_map_memory(addr); + /* + * If address less than pageblock_size bytes away from a present + * memory chunk there still will be a memory map entry for it + * because we round freed memory map to the pageblock boundaries. + */ + if (memblock_overlaps_region(&memblock.memory, + ALIGN_DOWN(addr, pageblock_size), + pageblock_size)) + return 1; + + return 0; } EXPORT_SYMBOL(pfn_valid); #endif
--
2.28.0
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