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Thomas Gleixner 383776fa75 locking/lockdep: Handle statically initialized PER_CPU locks properly 
If a PER_CPU struct which contains a spin_lock is statically initialized
via:

DEFINE_PER_CPU(struct foo, bla) = {
	.lock = __SPIN_LOCK_UNLOCKED(bla.lock)
};

then lockdep assigns a seperate key to each lock because the logic for
assigning a key to statically initialized locks is to use the address as
the key. With per CPU locks the address is obvioulsy different on each CPU.

That's wrong, because all locks should have the same key.

To solve this the following modifications are required:

 1) Extend the is_kernel/module_percpu_addr() functions to hand back the
    canonical address of the per CPU address, i.e. the per CPU address
    minus the per CPU offset.

 2) Check the lock address with these functions and if the per CPU check
    matches use the returned canonical address as the lock key, so all per
    CPU locks have the same key.

 3) Move the static_obj(key) check into look_up_lock_class() so this check
    can be avoided for statically initialized per CPU locks.  That's
    required because the canonical address fails the static_obj(key) check
    for obvious reasons.

Reported-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
[ Merged Dan's fixups for !MODULES and !SMP into this patch. ]
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Dan Murphy <dmurphy@ti.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20170227143736.pectaimkjkan5kow@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-03-16 09:57:08 +01:00
..
kasan Merge branch 'prep-for-5level' 2017-03-10 08:59:07 -08:00
backing-dev.c bdi: Fix use-after-free in wb_congested_put() 2017-03-08 10:55:17 -07:00
balloon_compaction.c
bootmem.c mm/bootmem.c: cosmetic improvement of code readability 2017-02-22 16:41:29 -08:00
cleancache.c
cma.c mm: cma: print allocation failure reason and bitmap status 2017-02-24 17:46:55 -08:00
cma.h
cma_debug.c mm: cma_alloc: allow to specify GFP mask 2017-02-24 17:46:55 -08:00
compaction.c sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h> 2017-03-02 08:42:32 +01:00
debug.c mm, debug: print raw struct page data in __dump_page() 2016-12-12 18:55:08 -08:00
debug_page_ref.c
dmapool.c lib/vsprintf.c: remove %Z support 2017-02-27 18:43:47 -08:00
early_ioremap.c
fadvise.c mm: fadvise: avoid expensive remote LRU cache draining after FADV_DONTNEED 2016-12-20 09:48:46 -08:00
failslab.c
filemap.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/signal.h> 2017-03-02 08:42:29 +01:00
frame_vector.c
frontswap.c
gup.c mm: convert generic code to 5-level paging 2017-03-09 11:48:47 -08:00
highmem.c
huge_memory.c Merge branch 'prep-for-5level' 2017-03-10 08:59:07 -08:00
hugetlb.c mm: convert generic code to 5-level paging 2017-03-09 11:48:47 -08:00
hugetlb_cgroup.c
hwpoison-inject.c
init-mm.c
internal.h mm, rmap: check all VMAs that PTE-mapped THP can be part of 2017-02-24 17:46:55 -08:00
interval_tree.c
Kconfig mm: THP page cache support for ppc64 2016-12-12 18:55:08 -08:00
Kconfig.debug mm: add arch-independent testcases for RODATA 2017-02-27 18:43:48 -08:00
khugepaged.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/coredump.h> 2017-03-02 08:42:28 +01:00
kmemcheck.c
kmemleak-test.c
kmemleak.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
ksm.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/coredump.h> 2017-03-02 08:42:28 +01:00
list_lru.c
maccess.c
madvise.c userfaultfd: non-cooperative: userfaultfd_remove revalidate vma in MADV_DONTNEED 2017-03-09 17:01:10 -08:00
Makefile mm: add arch-independent testcases for RODATA 2017-02-27 18:43:48 -08:00
memblock.c mm/memblock.c: fix memblock_next_valid_pfn() 2017-03-09 17:01:10 -08:00
memcontrol.c mm: do not call mem_cgroup_free() from within mem_cgroup_alloc() 2017-03-09 17:01:10 -08:00
memory-failure.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task.h> 2017-03-02 08:42:35 +01:00
memory.c mm: introduce __p4d_alloc() 2017-03-09 11:48:48 -08:00
memory_hotplug.c sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h> 2017-03-02 08:42:32 +01:00
mempolicy.c sched/headers: Prepare to move the task_lock()/unlock() APIs to <linux/sched/task.h> 2017-03-02 08:42:38 +01:00
mempool.c
memtest.c
migrate.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/mm.h> 2017-03-02 08:42:28 +01:00
mincore.c mm: remove shmem_mapping() shmem_zero_setup() duplicates 2017-02-24 17:46:56 -08:00
mlock.c Merge branch 'prep-for-5level' 2017-03-10 08:59:07 -08:00
mm_init.c
mmap.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-03-02 15:20:00 -08:00
mmu_context.c sched/headers: Prepare to move the task_lock()/unlock() APIs to <linux/sched/task.h> 2017-03-02 08:42:38 +01:00
mmu_notifier.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/mm.h> 2017-03-02 08:42:28 +01:00
mmzone.c mm/mmzone.c: swap likely to unlikely as code logic is different for next_zones_zonelist() 2017-02-22 16:41:29 -08:00
mprotect.c mm: convert generic code to 5-level paging 2017-03-09 11:48:47 -08:00
mremap.c mm: convert generic code to 5-level paging 2017-03-09 11:48:47 -08:00
msync.c
nobootmem.c
nommu.c Merge branch 'WIP.sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-03-03 10:16:38 -08:00
oom_kill.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task.h> 2017-03-02 08:42:35 +01:00
page-writeback.c sched/headers: Prepare for the reduction of <linux/sched.h>'s signal API dependency 2017-03-02 08:42:37 +01:00
page_alloc.c mm, page_alloc: Add missing check for memory holes 2017-03-08 11:10:10 -08:00
page_counter.c
page_ext.c
page_idle.c mm: fix handling PTE-mapped THPs in page_idle_clear_pte_refs() 2017-02-24 17:46:55 -08:00
page_io.c
page_isolation.c mm, page_alloc: avoid page_to_pfn() when merging buddies 2017-02-22 16:41:27 -08:00
page_owner.c
page_poison.c
page_vma_mapped.c mm: convert generic code to 5-level paging 2017-03-09 11:48:47 -08:00
pagewalk.c mm: convert generic code to 5-level paging 2017-03-09 11:48:47 -08:00
percpu-km.c
percpu-vm.c
percpu.c locking/lockdep: Handle statically initialized PER_CPU locks properly 2017-03-16 09:57:08 +01:00
pgtable-generic.c mm: convert generic code to 5-level paging 2017-03-09 11:48:47 -08:00
process_vm_access.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/mm.h> 2017-03-02 08:42:28 +01:00
quicklist.c
readahead.c mm: don't cap request size based on read-ahead setting 2016-12-12 18:55:08 -08:00
rmap.c Merge branch 'prep-for-5level' 2017-03-10 08:59:07 -08:00
rodata_test.c mm: add arch-independent testcases for RODATA 2017-02-27 18:43:48 -08:00
shmem.c Merge branch 'rebased-statx' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-03-03 11:38:56 -08:00
slab.c sched/headers: Prepare to move kstack_end() from <linux/sched.h> to <linux/sched/task_stack.h> 2017-03-02 08:42:39 +01:00
slab.h slab: remove synchronous synchronize_sched() from memcg cache deactivation path 2017-02-22 16:41:27 -08:00
slab_common.c kasan: drain quarantine of memcg slab objects 2017-02-24 17:46:56 -08:00
slob.c slab: introduce __kmemcg_cache_deactivate() 2017-02-22 16:41:27 -08:00
slub.c slub: make sysfs directories for memcg sub-caches optional 2017-02-22 16:41:27 -08:00
sparse-vmemmap.c mm: convert generic code to 5-level paging 2017-03-09 11:48:47 -08:00
sparse.c mm/memory_hotplug: set magic number to page->freelist instead of page->lru.next 2017-02-22 16:41:29 -08:00
swap.c mm: vmscan: move dirty pages out of the way until they're flushed 2017-02-24 17:46:54 -08:00
swap_cgroup.c
swap_slots.c mm/swap: skip readahead only when swap slot cache is enabled 2017-02-22 16:41:30 -08:00
swap_state.c mm/swap: skip readahead only when swap slot cache is enabled 2017-02-22 16:41:30 -08:00
swapfile.c mm: convert generic code to 5-level paging 2017-03-09 11:48:47 -08:00
truncate.c fs: add i_blocksize() 2017-02-27 18:43:46 -08:00
usercopy.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task.h> 2017-03-02 08:42:35 +01:00
userfaultfd.c mm: convert generic code to 5-level paging 2017-03-09 11:48:47 -08:00
util.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
vmacache.c sched/headers: Prepare to move 'init_task' and 'init_thread_union' from <linux/sched.h> to <linux/sched/task.h> 2017-03-02 08:42:38 +01:00
vmalloc.c mm: convert generic code to 5-level paging 2017-03-09 11:48:47 -08:00
vmpressure.c mm: vmpressure: fix sending wrong events on underflow 2017-02-24 17:46:56 -08:00
vmscan.c sched/headers: Prepare to move the memalloc_noio_*() APIs to <linux/sched/mm.h> 2017-03-02 08:42:33 +01:00
vmstat.c mm/vmstats: add thp_split_pud event for clarity 2017-03-09 17:01:10 -08:00
workingset.c Merge branch 'idr-4.11' of git://git.infradead.org/users/willy/linux-dax 2017-02-28 20:29:41 -08:00
z3fold.c z3fold: add kref refcounting 2017-02-24 17:46:54 -08:00
zbud.c
zpool.c
zsmalloc.c sched/headers: Prepare to remove the <linux/magic.h> include from <linux/sched/task_stack.h> 2017-03-02 08:42:40 +01:00
zswap.c zswap: don't param_set_charp while holding spinlock 2017-02-27 18:43:45 -08:00