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authorStephen Boyd <sboyd@codeaurora.org>2012-12-19 23:39:48 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-20 13:50:16 -0800
commitfcc16882ac4532aaa644bff444f0c5d6228ba71e (patch)
tree7104729ed7fd136a26ea47462e716410666aa1f6 /include
parent787314c35fbb97e02823a1b8eb8cfa58f366cd49 (diff)
lib: atomic64: Initialize locks statically to fix early users
The atomic64 library uses a handful of static spin locks to implement atomic 64-bit operations on architectures without support for atomic 64-bit instructions. Unfortunately, the spinlocks are initialized in a pure initcall and that is too late for the vfs namespace code which wants to use atomic64 operations before the initcall is run. This became a problem as of commit 8823c079ba71: "vfs: Add setns support for the mount namespace". This leads to BUG messages such as: BUG: spinlock bad magic on CPU#0, swapper/0/0 lock: atomic64_lock+0x240/0x400, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0 do_raw_spin_lock+0x158/0x198 _raw_spin_lock_irqsave+0x4c/0x58 atomic64_add_return+0x30/0x5c alloc_mnt_ns.clone.14+0x44/0xac create_mnt_ns+0xc/0x54 mnt_init+0x120/0x1d4 vfs_caches_init+0xe0/0x10c start_kernel+0x29c/0x300 coming out early on during boot when spinlock debugging is enabled. Fix this by initializing the spinlocks statically at compile time. Reported-and-tested-by: Vaibhav Bedia <vaibhav.bedia@ti.com> Tested-by: Tony Lindgren <tony@atomide.com> Cc: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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