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lockdep: allow instrumenting lockdep.c with KMSAN

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Lockdep and KMSAN used to play badly together, causing deadlocks when
KMSAN instrumentation of lockdep.c called lockdep functions recursively.

Looks like this is no more the case, and a kernel can run (yet slower)
with both KMSAN and lockdep enabled.  This patch should fix false
positives on wq_head->lock->dep_map, which KMSAN used to consider
uninitialized because of lockdep.c not being instrumented.

Link: https://lore.kernel.org/lkml/Y3b9AAEKp2Vr3e6O@sol.localdomain/
Link: https://lkml.kernel.org/r/20221128094541.2645890-1-glider@google.com
Signed-off-by: Alexander Potapenko <glider@google.com>
Reported-by: Eric Biggers <ebiggers@kernel.org>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Marco Elver <elver@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Alexander Potapenko 2022-11-28 10:45:40 +01:00 committed by Andrew Morton
parent d3a8923358
commit 1e8e4a7cc2
1 changed files with 0 additions and 1 deletions
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kernel/locking/Makefile
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@ -7,7 +7,6 @@ obj-y += mutex.o semaphore.o rwsem.o percpu-rwsem.o
# Avoid recursion lockdep -> sanitizer -> ... -> lockdep.
KCSAN_SANITIZE_lockdep.o := n
KMSAN_SANITIZE_lockdep.o := n
ifdef CONFIG_FUNCTION_TRACER
CFLAGS_REMOVE_lockdep.o = $(CC_FLAGS_FTRACE)