On receiving the MEM_GOING_OFFLINE notification, we disallow offlining of any boot memory by checking if section_early or not. With the introduction of SECTION_MARK_HOTPLUGGABLE, allow boot mem sections that are marked as hotpluggable with this bit set to be offlined and removed. This now allows certain boot mem sections to be offlined.
Signed-off-by: Sudarshan Rajagopalan <[email protected]> Cc: Catalin Marinas <[email protected]> Cc: Will Deacon <[email protected]> Cc: Anshuman Khandual <[email protected]> Cc: Mark Rutland <[email protected]> Cc: Gavin Shan <[email protected]> Cc: Logan Gunthorpe <[email protected]> Cc: David Hildenbrand <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Steven Price <[email protected]> Cc: Suren Baghdasaryan <[email protected]> --- arch/arm64/mm/mmu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index 75df62fea1b6..fb8878698672 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -1487,7 +1487,7 @@ static int prevent_bootmem_remove_notifier(struct notifier_block *nb, for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) { ms = __pfn_to_section(pfn); - if (early_section(ms)) + if (early_section(ms) && !removable_section(ms)) return NOTIFY_BAD; } return NOTIFY_OK; -- Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
