Randy Dunlap 5a3ac10611 locking/lockdep: Reduce LOCKDEP dependency list
[ Upstream commit b8e00abe7d9fe21dd13609e2e3a707e38902b105 ]

Some arches (um, sparc64, riscv, xtensa) cause a Kconfig warning for
LOCKDEP.
These arch-es select LOCKDEP_SUPPORT but they are not listed as one
of the arch-es that LOCKDEP depends on.

Since (16) arch-es define the Kconfig symbol LOCKDEP_SUPPORT if they
intend to have LOCKDEP support, replace the awkward list of
arch-es that LOCKDEP depends on with the LOCKDEP_SUPPORT symbol.

But wait. LOCKDEP_SUPPORT is included in LOCK_DEBUGGING_SUPPORT,
which is already a dependency here, so LOCKDEP_SUPPORT is redundant
and not needed.
That leaves the FRAME_POINTER dependency, but it is part of an
expression like this:
	depends on (A && B) && (FRAME_POINTER || B')
where B' is a dependency of B so if B is true then B' is true
and the value of FRAME_POINTER does not matter.
Thus we can also delete the FRAME_POINTER dependency.

Fixes this kconfig warning: (for um, sparc64, riscv, xtensa)

WARNING: unmet direct dependencies detected for LOCKDEP
  Depends on [n]: DEBUG_KERNEL [=y] && LOCK_DEBUGGING_SUPPORT [=y] && (FRAME_POINTER [=n] || MIPS || PPC || S390 || MICROBLAZE || ARM || ARC || X86)
  Selected by [y]:
  - PROVE_LOCKING [=y] && DEBUG_KERNEL [=y] && LOCK_DEBUGGING_SUPPORT [=y]
  - LOCK_STAT [=y] && DEBUG_KERNEL [=y] && LOCK_DEBUGGING_SUPPORT [=y]
  - DEBUG_LOCK_ALLOC [=y] && DEBUG_KERNEL [=y] && LOCK_DEBUGGING_SUPPORT [=y]

Fixes: 7d37cb2c912d ("lib: fix kconfig dependency on ARCH_WANT_FRAME_POINTERS")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Waiman Long <longman@redhat.com>
Link: https://lkml.kernel.org/r/20210524224150.8009-1-rdunlap@infradead.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-07-14 16:56:05 +02:00
..
2020-10-18 14:45:59 -07:00
2020-08-09 14:10:26 -07:00
2021-04-10 13:36:10 +02:00
2020-05-24 20:48:11 +02:00
2020-10-16 11:11:19 -07:00
2018-08-16 12:14:42 -07:00
2020-10-20 14:39:37 -07:00
2020-10-13 18:38:32 -07:00
2020-12-11 14:02:14 -08:00
2018-10-16 13:45:44 +02:00
2020-10-20 14:39:37 -07:00
2019-07-11 15:17:41 -07:00
2020-09-26 10:33:57 -07:00
2020-06-29 10:02:23 +02:00
2018-10-15 16:31:29 -04:00
2020-06-07 10:53:36 -07:00