locking/refcount: Remove the half-implemented refcount_sub() API
CONFIG_REFCOUNT_FULL=y (correctly) does not provide a refcount_sub(), which should not be part of proper refcount design patterns. Remove the erroneous extern and the later !CONFIG_REFCOUNT_FULL accidental implementation. Signed-off-by:Kees Cook <keescook@chromium.org> Cc: Elena Reshetova <elena.reshetova@intel.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Fixes: 29dee3c0 ("locking/refcounts: Out-of-line everything") Link: http://lkml.kernel.org/r/20170701180129.GA17405@beast Signed-off-by:
Ingo Molnar <mingo@kernel.org>
parent
fd25d19f
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