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V" , Baoquan He , Dan Williams , Oscar Salvador , Wei Yang , David Hildenbrand Subject: [PATCH for 4.19-stable v3 01/24] mm/memory_hotplug: make remove_memory() take the device_hotplug_lock Date: Tue, 28 Jan 2020 10:49:58 +0100 Message-Id: <20200128095021.8076-2-david@redhat.com> In-Reply-To: <20200128095021.8076-1-david@redhat.com> References: <20200128095021.8076-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: commit d15e59260f62bd5e0f625cf5f5240f6ffac78ab6 upstream. Patch series "mm: online/offline_pages called w.o. mem_hotplug_lock", v3. Reading through the code and studying how mem_hotplug_lock is to be used, I noticed that there are two places where we can end up calling device_online()/device_offline() - online_pages()/offline_pages() without the mem_hotplug_lock. And there are other places where we call device_online()/device_offline() without the device_hotplug_lock. While e.g. echo "online" > /sys/devices/system/memory/memory9/state is fine, e.g. echo 1 > /sys/devices/system/memory/memory9/online Will not take the mem_hotplug_lock. However the device_lock() and device_hotplug_lock. E.g. via memory_probe_store(), we can end up calling add_memory()->online_pages() without the device_hotplug_lock. So we can have concurrent callers in online_pages(). We e.g. touch in online_pages() basically unprotected zone->present_pages then. Looks like there is a longer history to that (see Patch #2 for details), and fixing it to work the way it was intended is not really possible. We would e.g. have to take the mem_hotplug_lock in device/base/core.c, whic= h sounds wrong. Summary: We had a lock inversion on mem_hotplug_lock and device_lock(). More details can be found in patch 3 and patch 6. I propose the general rules (documentation added in patch 6): 1. add_memory/add_memory_resource() must only be called with device_hotplug_lock. 2. remove_memory() must only be called with device_hotplug_lock. This is already documented and holds for all callers. 3. device_online()/device_offline() must only be called with device_hotplug_lock. This is already documented and true for now in co= re code. Other callers (related to memory hotplug) have to be fixed up. 4. mem_hotplug_lock is taken inside of add_memory/remove_memory/ online_pages/offline_pages. To me, this looks way cleaner than what we have right now (and easier to verify). And looking at the documentation of remove_memory, using lock_device_hotplug also for add_memory() feels natural. This patch (of 6): remove_memory() is exported right now but requires the device_hotplug_lock, which is not exported. So let's provide a variant that takes the lock and only export that one. The lock is already held in arch/powerpc/platforms/pseries/hotplug-memory.c drivers/acpi/acpi_memhotplug.c arch/powerpc/platforms/powernv/memtrace.c Apart from that, there are not other users in the tree. Link: http://lkml.kernel.org/r/20180925091457.28651-2-david@redhat.com Signed-off-by: David Hildenbrand Reviewed-by: Pavel Tatashin Reviewed-by: Rafael J. Wysocki Reviewed-by: Rashmica Gupta Reviewed-by: Oscar Salvador Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Michael Ellerman Cc: "Rafael J. Wysocki" Cc: Len Brown Cc: Rashmica Gupta Cc: Michael Neuling Cc: Balbir Singh Cc: Nathan Fontenot Cc: John Allen Cc: Michal Hocko Cc: Dan Williams Cc: Joonsoo Kim Cc: Vlastimil Babka Cc: Greg Kroah-Hartman Cc: YASUAKI ISHIMATSU Cc: Mathieu Malaterre Cc: Boris Ostrovsky Cc: Haiyang Zhang Cc: Heiko Carstens Cc: Jonathan Corbet Cc: Juergen Gross Cc: Kate Stewart Cc: "K. Y. Srinivasan" Cc: Martin Schwidefsky Cc: Philippe Ombredanne Cc: Stephen Hemminger Cc: Thomas Gleixner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: David Hildenbrand --- arch/powerpc/platforms/powernv/memtrace.c | 2 +- arch/powerpc/platforms/pseries/hotplug-memory.c | 6 +++--- drivers/acpi/acpi_memhotplug.c | 2 +- include/linux/memory_hotplug.h | 3 ++- mm/memory_hotplug.c | 9 ++++++++- 5 files changed, 15 insertions(+), 7 deletions(-) diff --git a/arch/powerpc/platforms/powernv/memtrace.c b/arch/powerpc/pla= tforms/powernv/memtrace.c index dd3cc4632b9a..84d038ed3882 100644 --- a/arch/powerpc/platforms/powernv/memtrace.c +++ b/arch/powerpc/platforms/powernv/memtrace.c @@ -122,7 +122,7 @@ static u64 memtrace_alloc_node(u32 nid, u64 size) */ end_pfn =3D base_pfn + nr_pages; for (pfn =3D base_pfn; pfn < end_pfn; pfn +=3D bytes>> PAGE_SHIFT) { - remove_memory(nid, pfn << PAGE_SHIFT, bytes); + __remove_memory(nid, pfn << PAGE_SHIFT, bytes); } unlock_device_hotplug(); return base_pfn << PAGE_SHIFT; diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/power= pc/platforms/pseries/hotplug-memory.c index 62d3c72cd931..c2c6f32848e1 100644 --- a/arch/powerpc/platforms/pseries/hotplug-memory.c +++ b/arch/powerpc/platforms/pseries/hotplug-memory.c @@ -301,7 +301,7 @@ static int pseries_remove_memblock(unsigned long base= , unsigned int memblock_siz nid =3D memory_add_physaddr_to_nid(base); =20 for (i =3D 0; i < sections_per_block; i++) { - remove_memory(nid, base, MIN_MEMORY_BLOCK_SIZE); + __remove_memory(nid, base, MIN_MEMORY_BLOCK_SIZE); base +=3D MIN_MEMORY_BLOCK_SIZE; } =20 @@ -393,7 +393,7 @@ static int dlpar_remove_lmb(struct drmem_lmb *lmb) block_sz =3D pseries_memory_block_size(); nid =3D memory_add_physaddr_to_nid(lmb->base_addr); =20 - remove_memory(nid, lmb->base_addr, block_sz); + __remove_memory(nid, lmb->base_addr, block_sz); =20 /* Update memory regions for memory remove */ memblock_remove(lmb->base_addr, block_sz); @@ -680,7 +680,7 @@ static int dlpar_add_lmb(struct drmem_lmb *lmb) =20 rc =3D dlpar_online_lmb(lmb); if (rc) { - remove_memory(nid, lmb->base_addr, block_sz); + __remove_memory(nid, lmb->base_addr, block_sz); invalidate_lmb_associativity_index(lmb); } else { lmb->flags |=3D DRCONF_MEM_ASSIGNED; diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplu= g.c index 2ccfbb61ca89..8fe0960ea572 100644 --- a/drivers/acpi/acpi_memhotplug.c +++ b/drivers/acpi/acpi_memhotplug.c @@ -282,7 +282,7 @@ static void acpi_memory_remove_memory(struct acpi_mem= ory_device *mem_device) nid =3D memory_add_physaddr_to_nid(info->start_addr); =20 acpi_unbind_memory_blocks(info); - remove_memory(nid, info->start_addr, info->length); + __remove_memory(nid, info->start_addr, info->length); list_del(&info->list); kfree(info); } diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplu= g.h index 4915e6cd7fd5..6f13a5a33b51 100644 --- a/include/linux/memory_hotplug.h +++ b/include/linux/memory_hotplug.h @@ -303,6 +303,7 @@ extern bool is_mem_section_removable(unsigned long pf= n, unsigned long nr_pages); extern void try_offline_node(int nid); extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages= ); extern void remove_memory(int nid, u64 start, u64 size); +extern void __remove_memory(int nid, u64 start, u64 size); =20 #else static inline bool is_mem_section_removable(unsigned long pfn, @@ -319,6 +320,7 @@ static inline int offline_pages(unsigned long start_p= fn, unsigned long nr_pages) } =20 static inline void remove_memory(int nid, u64 start, u64 size) {} +static inline void __remove_memory(int nid, u64 start, u64 size) {} #endif /* CONFIG_MEMORY_HOTREMOVE */ =20 extern void __ref free_area_init_core_hotplug(int nid); @@ -333,7 +335,6 @@ extern void move_pfn_range_to_zone(struct zone *zone,= unsigned long start_pfn, unsigned long nr_pages, struct vmem_altmap *altmap); extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages= ); extern bool is_memblock_offlined(struct memory_block *mem); -extern void remove_memory(int nid, u64 start, u64 size); extern int sparse_add_one_section(struct pglist_data *pgdat, unsigned long start_pfn, struct vmem_altmap *altmap); extern void sparse_remove_one_section(struct zone *zone, struct mem_sect= ion *ms, diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 413f6709039a..e2e2cf7014ee 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1893,7 +1893,7 @@ EXPORT_SYMBOL(try_offline_node); * and online/offline operations before this call, as required by * try_offline_node(). */ -void __ref remove_memory(int nid, u64 start, u64 size) +void __ref __remove_memory(int nid, u64 start, u64 size) { int ret; =20 @@ -1922,5 +1922,12 @@ void __ref remove_memory(int nid, u64 start, u64 s= ize) =20 mem_hotplug_done(); } + +void remove_memory(int nid, u64 start, u64 size) +{ + lock_device_hotplug(); + __remove_memory(nid, start, size); + unlock_device_hotplug(); +} EXPORT_SYMBOL_GPL(remove_memory); #endif /* CONFIG_MEMORY_HOTREMOVE */ --=20 2.24.1