mm/memory_hotplug: shrink zones when offlining memory

We currently try to shrink a single zone when removing memory.  We use
the zone of the first page of the memory we are removing.  If that
memmap was never initialized (e.g., memory was never onlined), we will
read garbage and can trigger kernel BUGs (due to a stale pointer):

    BUG: unable to handle page fault for address: 000000000000353d
    #PF: supervisor write access in kernel mode
    #PF: error_code(0x0002) - not-present page
    PGD 0 P4D 0
    Oops: 0002 [#1] SMP PTI
    CPU: 1 PID: 7 Comm: kworker/u8:0 Not tainted 5.3.0-rc5-next-20190820+ #317
    Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.1-0-ga5cab58e9a3f-prebuilt.qemu.4
    Workqueue: kacpi_hotplug acpi_hotplug_work_fn
    RIP: 0010:clear_zone_contiguous+0x5/0x10
    Code: 48 89 c6 48 89 c3 e8 2a fe ff ff 48 85 c0 75 cf 5b 5d c3 c6 85 fd 05 00 00 01 5b 5d c3 0f 1f 840
    RSP: 0018:ffffad2400043c98 EFLAGS: 00010246
    RAX: 0000000000000000 RBX: 0000000200000000 RCX: 0000000000000000
    RDX: 0000000000200000 RSI: 0000000000140000 RDI: 0000000000002f40
    RBP: 0000000140000000 R08: 0000000000000000 R09: 0000000000000001
    R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000140000
    R13: 0000000000140000 R14: 0000000000002f40 R15: ffff9e3e7aff3680
    FS:  0000000000000000(0000) GS:ffff9e3e7bb00000(0000) knlGS:0000000000000000
    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 000000000000353d CR3: 0000000058610000 CR4: 00000000000006e0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
    Call Trace:
     __remove_pages+0x4b/0x640
     arch_remove_memory+0x63/0x8d
     try_remove_memory+0xdb/0x130
     __remove_memory+0xa/0x11
     acpi_memory_device_remove+0x70/0x100
     acpi_bus_trim+0x55/0x90
     acpi_device_hotplug+0x227/0x3a0
     acpi_hotplug_work_fn+0x1a/0x30
     process_one_work+0x221/0x550
     worker_thread+0x50/0x3b0
     kthread+0x105/0x140
     ret_from_fork+0x3a/0x50
    Modules linked in:
    CR2: 000000000000353d

Instead, shrink the zones when offlining memory or when onlining failed.
Introduce and use remove_pfn_range_from_zone(() for that.  We now
properly shrink the zones, even if we have DIMMs whereby

 - Some memory blocks fall into no zone (never onlined)

 - Some memory blocks fall into multiple zones (offlined+re-onlined)

 - Multiple memory blocks that fall into different zones

Drop the zone parameter (with a potential dubious value) from
__remove_pages() and __remove_section().

Link: http://lkml.kernel.org/r/20191006085646.5768-6-david@redhat.com
Fixes: f1dd2cd13c4b ("mm, memory_hotplug: do not associate hotadded memory to zones until online")	[visible after d0dc12e86b319]
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: Michal Hocko <mhocko@suse.com>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Logan Gunthorpe <logang@deltatee.com>
Cc: <stable@vger.kernel.org>	[5.0+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 5a3b15a14a7f116bc6b61a9279ed5ce84723702e..40797cbfba2d67412eee7864325e9f89adeb08d2 100644 (file)
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -1070,7 +1070,6 @@ void arch_remove_memory(int nid, u64 start, u64 size,
 {
        unsigned long start_pfn = start >> PAGE_SHIFT;
        unsigned long nr_pages = size >> PAGE_SHIFT;
-       struct zone *zone;
 
        /*
         * FIXME: Cleanup page tables (also in arch_add_memory() in case
@@ -1079,7 +1078,6 @@ void arch_remove_memory(int nid, u64 start, u64 size,
         * unplug. ARCH_ENABLE_MEMORY_HOTREMOVE must not be
         * unlocked yet.
         */
-       zone = page_zone(pfn_to_page(start_pfn));
-       __remove_pages(zone, start_pfn, nr_pages, altmap);
+       __remove_pages(start_pfn, nr_pages, altmap);
 }
 #endif

diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index 58fd67068bac5036e96514039688fc3844a635aa..b01d68a2d5d97360d0b612e465fb70635aa80ef6 100644 (file)
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -689,9 +689,7 @@ void arch_remove_memory(int nid, u64 start, u64 size,
 {
        unsigned long start_pfn = start >> PAGE_SHIFT;
        unsigned long nr_pages = size >> PAGE_SHIFT;
-       struct zone *zone;
 
-       zone = page_zone(pfn_to_page(start_pfn));
-       __remove_pages(zone, start_pfn, nr_pages, altmap);
+       __remove_pages(start_pfn, nr_pages, altmap);
 }
 #endif

diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 617c2777926fc15344937701d9d02f2bbc09c962..f5535eae637fbcf52c91d7e6a7dea4e5c5a7e0ab 100644 (file)
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -151,10 +151,9 @@ void __ref arch_remove_memory(int nid, u64 start, u64 size,
 {
        unsigned long start_pfn = start >> PAGE_SHIFT;
        unsigned long nr_pages = size >> PAGE_SHIFT;
-       struct page *page = pfn_to_page(start_pfn) + vmem_altmap_offset(altmap);
        int ret;
 
-       __remove_pages(page_zone(page), start_pfn, nr_pages, altmap);
+       __remove_pages(start_pfn, nr_pages, altmap);
 
        /* Remove htab bolted mappings for this section of memory */
        start = (unsigned long)__va(start);

diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index f0ce2222056592fdd0941b43918f610c2ee958cb..ac44bd76db4be13443b3da63e4ef0377516d2ddb 100644 (file)
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -292,10 +292,8 @@ void arch_remove_memory(int nid, u64 start, u64 size,
 {
        unsigned long start_pfn = start >> PAGE_SHIFT;
        unsigned long nr_pages = size >> PAGE_SHIFT;
-       struct zone *zone;
 
-       zone = page_zone(pfn_to_page(start_pfn));
-       __remove_pages(zone, start_pfn, nr_pages, altmap);
+       __remove_pages(start_pfn, nr_pages, altmap);
        vmem_remove_mapping(start, size);
 }
 #endif /* CONFIG_MEMORY_HOTPLUG */

diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index dfdbaa50946ebbdfb2c1853b738eaf72ae0d734e..d1b1ff2be17aa728a84ba8e8701313664e9a76df 100644 (file)
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -434,9 +434,7 @@ void arch_remove_memory(int nid, u64 start, u64 size,
 {
        unsigned long start_pfn = PFN_DOWN(start);
        unsigned long nr_pages = size >> PAGE_SHIFT;
-       struct zone *zone;
 
-       zone = page_zone(pfn_to_page(start_pfn));
-       __remove_pages(zone, start_pfn, nr_pages, altmap);
+       __remove_pages(start_pfn, nr_pages, altmap);
 }
 #endif /* CONFIG_MEMORY_HOTPLUG */

diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index 930edeb41ec33417755d38293f85ad1717cdee90..0a74407ef92ea939aaa8425613ae8bcda2419b70 100644 (file)
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -865,10 +865,8 @@ void arch_remove_memory(int nid, u64 start, u64 size,
 {
        unsigned long start_pfn = start >> PAGE_SHIFT;
        unsigned long nr_pages = size >> PAGE_SHIFT;
-       struct zone *zone;
 
-       zone = page_zone(pfn_to_page(start_pfn));
-       __remove_pages(zone, start_pfn, nr_pages, altmap);
+       __remove_pages(start_pfn, nr_pages, altmap);
 }
 #endif
 

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index dcb9bc961b39c3e2928eb4d15f681c8dad29591e..bcfede46fe02b54d0b73d74de7112e351a2b4272 100644 (file)
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -1212,10 +1212,8 @@ void __ref arch_remove_memory(int nid, u64 start, u64 size,
 {
        unsigned long start_pfn = start >> PAGE_SHIFT;
        unsigned long nr_pages = size >> PAGE_SHIFT;
-       struct page *page = pfn_to_page(start_pfn) + vmem_altmap_offset(altmap);
-       struct zone *zone = page_zone(page);
 
-       __remove_pages(zone, start_pfn, nr_pages, altmap);
+       __remove_pages(start_pfn, nr_pages, altmap);
        kernel_physical_mapping_remove(start, start + size);
 }
 #endif /* CONFIG_MEMORY_HOTPLUG */

diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index 3a08ecdfca116d1cdbbbb383e10e282af7065749..ba0dca6aac6ee307d90b93e1f0dea40e4a5f82c7 100644 (file)
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -122,8 +122,8 @@ static inline bool movable_node_is_enabled(void)
 
 extern void arch_remove_memory(int nid, u64 start, u64 size,
                               struct vmem_altmap *altmap);
-extern void __remove_pages(struct zone *zone, unsigned long start_pfn,
-                          unsigned long nr_pages, struct vmem_altmap *altmap);
+extern void __remove_pages(unsigned long start_pfn, unsigned long nr_pages,
+                          struct vmem_altmap *altmap);
 
 /* reasonably generic interface to expand the physical pages */
 extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
@@ -342,6 +342,9 @@ extern int add_memory(int nid, u64 start, u64 size);
 extern int add_memory_resource(int nid, struct resource *resource);
 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
                unsigned long nr_pages, struct vmem_altmap *altmap);
+extern void remove_pfn_range_from_zone(struct zone *zone,
+                                      unsigned long start_pfn,
+                                      unsigned long nr_pages);
 extern bool is_memblock_offlined(struct memory_block *mem);
 extern int sparse_add_section(int nid, unsigned long pfn,
                unsigned long nr_pages, struct vmem_altmap *altmap);

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 55ac23ef11c1cbf1e13f187b5c850d4075128ad5..a91a072f2b2ce6baf432f09c3cfe74dbaec0033b 100644 (file)
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -483,8 +483,9 @@ static void update_pgdat_span(struct pglist_data *pgdat)
        pgdat->node_spanned_pages = node_end_pfn - node_start_pfn;
 }
 
-static void __remove_zone(struct zone *zone, unsigned long start_pfn,
-               unsigned long nr_pages)
+void __ref remove_pfn_range_from_zone(struct zone *zone,
+                                     unsigned long start_pfn,
+                                     unsigned long nr_pages)
 {
        struct pglist_data *pgdat = zone->zone_pgdat;
        unsigned long flags;
@@ -499,28 +500,30 @@ static void __remove_zone(struct zone *zone, unsigned long start_pfn,
                return;
 #endif
 
+       clear_zone_contiguous(zone);
+
        pgdat_resize_lock(zone->zone_pgdat, &flags);
        shrink_zone_span(zone, start_pfn, start_pfn + nr_pages);
        update_pgdat_span(pgdat);
        pgdat_resize_unlock(zone->zone_pgdat, &flags);
+
+       set_zone_contiguous(zone);
 }
 
-static void __remove_section(struct zone *zone, unsigned long pfn,
-               unsigned long nr_pages, unsigned long map_offset,
-               struct vmem_altmap *altmap)
+static void __remove_section(unsigned long pfn, unsigned long nr_pages,
+                            unsigned long map_offset,
+                            struct vmem_altmap *altmap)
 {
        struct mem_section *ms = __nr_to_section(pfn_to_section_nr(pfn));
 
        if (WARN_ON_ONCE(!valid_section(ms)))
                return;
 
-       __remove_zone(zone, pfn, nr_pages);
        sparse_remove_section(ms, pfn, nr_pages, map_offset, altmap);
 }
 
 /**
- * __remove_pages() - remove sections of pages from a zone
- * @zone: zone from which pages need to be removed
+ * __remove_pages() - remove sections of pages
  * @pfn: starting pageframe (must be aligned to start of a section)
  * @nr_pages: number of pages to remove (must be multiple of section size)
  * @altmap: alternative device page map or %NULL if default memmap is used
@@ -530,16 +533,14 @@ static void __remove_section(struct zone *zone, unsigned long pfn,
  * sure that pages are marked reserved and zones are adjust properly by
  * calling offline_pages().
  */
-void __remove_pages(struct zone *zone, unsigned long pfn,
-                   unsigned long nr_pages, struct vmem_altmap *altmap)
+void __remove_pages(unsigned long pfn, unsigned long nr_pages,
+                   struct vmem_altmap *altmap)
 {
        unsigned long map_offset = 0;
        unsigned long nr, start_sec, end_sec;
 
        map_offset = vmem_altmap_offset(altmap);
 
-       clear_zone_contiguous(zone);
-
        if (check_pfn_span(pfn, nr_pages, "remove"))
                return;
 
@@ -551,13 +552,11 @@ void __remove_pages(struct zone *zone, unsigned long pfn,
                cond_resched();
                pfns = min(nr_pages, PAGES_PER_SECTION
                                - (pfn & ~PAGE_SECTION_MASK));
-               __remove_section(zone, pfn, pfns, map_offset, altmap);
+               __remove_section(pfn, pfns, map_offset, altmap);
                pfn += pfns;
                nr_pages -= pfns;
                map_offset = 0;
        }
-
-       set_zone_contiguous(zone);
 }
 
 int set_online_page_callback(online_page_callback_t callback)
@@ -869,6 +868,7 @@ failed_addition:
                 (unsigned long long) pfn << PAGE_SHIFT,
                 (((unsigned long long) pfn + nr_pages) << PAGE_SHIFT) - 1);
        memory_notify(MEM_CANCEL_ONLINE, &arg);
+       remove_pfn_range_from_zone(zone, pfn, nr_pages);
        mem_hotplug_done();
        return ret;
 }
@@ -1628,6 +1628,7 @@ static int __ref __offline_pages(unsigned long start_pfn,
        writeback_set_ratelimit();
 
        memory_notify(MEM_OFFLINE, &arg);
+       remove_pfn_range_from_zone(zone, start_pfn, nr_pages);
        mem_hotplug_done();
        return 0;
 

diff --git a/mm/memremap.c b/mm/memremap.c
index 03ccbdfeb6972018eea805d5848b4a9b3a3ba4cd..c51c6bd2fe3425f0fc00dae12f29dcec5d395a42 100644 (file)
--- a/mm/memremap.c
+++ b/mm/memremap.c
@@ -120,7 +120,7 @@ void memunmap_pages(struct dev_pagemap *pgmap)
 
        mem_hotplug_begin();
        if (pgmap->type == MEMORY_DEVICE_PRIVATE) {
-               __remove_pages(page_zone(first_page), PHYS_PFN(res->start),
+               __remove_pages(PHYS_PFN(res->start),
                               PHYS_PFN(resource_size(res)), NULL);
        } else {
                arch_remove_memory(nid, res->start, resource_size(res),