From de0ed36a3ecc0b51da4f16fa0af47ba6b7ffad22 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Tue, 18 Oct 2011 14:00:57 -0700 Subject: [PATCH] Revert "memory hotplug: Correct page reservation checking" This reverts commit 54f23eb7ba7619de85d8edca6e5336bc33072dbd. Turns out this patch is wrong, another correct one will follow it. Signed-off-by: Greg Kroah-Hartman --- drivers/base/memory.c | 60 +++++++++++++++++-------------------------- 1 file changed, 23 insertions(+), 37 deletions(-) diff --git a/drivers/base/memory.c b/drivers/base/memory.c index ca8bfe59ae32..2a0b5f1020ed 100644 --- a/drivers/base/memory.c +++ b/drivers/base/memory.c @@ -227,42 +227,41 @@ int memory_isolate_notify(unsigned long val, void *v) * MEMORY_HOTPLUG depends on SPARSEMEM in mm/Kconfig, so it is * OK to have direct references to sparsemem variables in here. */ -static int check_page_reservations(unsigned long phys_index) -{ - int i; - struct page *page; - - page = pfn_to_page(phys_index << PFN_SECTION_SHIFT); - - for (i = 0; i < PAGES_PER_SECTION; i++) { - if (PageReserved(page + i)) - continue; - - printk(KERN_WARNING "section number %ld page number %d " - "not reserved, was it already online?\n", phys_index, i); - return -EBUSY; - } - - return 0; -} - static int memory_block_action(unsigned long phys_index, unsigned long action) { + int i; unsigned long start_pfn, start_paddr; unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block; - struct page *page; + struct page *first_page; int ret; - page = pfn_to_page(phys_index << PFN_SECTION_SHIFT); + first_page = pfn_to_page(phys_index << PFN_SECTION_SHIFT); + + /* + * The probe routines leave the pages reserved, just + * as the bootmem code does. Make sure they're still + * that way. + */ + if (action == MEM_ONLINE) { + for (i = 0; i < nr_pages; i++) { + if (PageReserved(first_page+i)) + continue; + + printk(KERN_WARNING "section number %ld page number %d " + "not reserved, was it already online?\n", + phys_index, i); + return -EBUSY; + } + } switch (action) { case MEM_ONLINE: - start_pfn = page_to_pfn(page); + start_pfn = page_to_pfn(first_page); ret = online_pages(start_pfn, nr_pages); break; case MEM_OFFLINE: - start_paddr = page_to_pfn(page) << PAGE_SHIFT; + start_paddr = page_to_pfn(first_page) << PAGE_SHIFT; ret = remove_memory(start_paddr, nr_pages << PAGE_SHIFT); break; @@ -278,7 +277,7 @@ memory_block_action(unsigned long phys_index, unsigned long action) static int memory_block_change_state(struct memory_block *mem, unsigned long to_state, unsigned long from_state_req) { - int i, ret = 0; + int ret = 0; mutex_lock(&mem->state_mutex); @@ -290,19 +289,6 @@ static int memory_block_change_state(struct memory_block *mem, if (to_state == MEM_OFFLINE) mem->state = MEM_GOING_OFFLINE; - if (to_state == MEM_ONLINE) { - /* - * The probe routines leave the pages reserved, just - * as the bootmem code does. Make sure they're still - * that way. - */ - for (i = 0; i < sections_per_block; i++) { - ret = check_page_reservations(mem->start_section_nr + i); - if (ret) - return ret; - } - } - ret = memory_block_action(mem->start_section_nr, to_state); if (ret) -- 2.30.2