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SubjectRe: [PATCH v2 06/28] locking/rwlocks: Add contention detection for rwlocks
On Tue, Feb 02, 2021 at 10:57:12AM -0800, Ben Gardon wrote:
> rwlocks do not currently have any facility to detect contention
> like spinlocks do. In order to allow users of rwlocks to better manage
> latency, add contention detection for queued rwlocks.
>
> CC: Ingo Molnar <mingo@redhat.com>
> CC: Will Deacon <will@kernel.org>
> Acked-by: Peter Zijlstra <peterz@infradead.org>
> Acked-by: Davidlohr Bueso <dbueso@suse.de>
> Acked-by: Waiman Long <longman@redhat.com>
> Acked-by: Paolo Bonzini <pbonzini@redhat.com>
> Signed-off-by: Ben Gardon <bgardon@google.com>

When building mips:defconfig, this patch results in:

Error log:
In file included from include/linux/spinlock.h:90,
from include/linux/ipc.h:5,
from include/uapi/linux/sem.h:5,
from include/linux/sem.h:5,
from include/linux/compat.h:14,
from arch/mips/kernel/asm-offsets.c:12:
arch/mips/include/asm/spinlock.h:17:28: error: redefinition of 'queued_spin_unlock'
17 | #define queued_spin_unlock queued_spin_unlock
| ^~~~~~~~~~~~~~~~~~
arch/mips/include/asm/spinlock.h:22:20: note: in expansion of macro 'queued_spin_unlock'
22 | static inline void queued_spin_unlock(struct qspinlock *lock)
| ^~~~~~~~~~~~~~~~~~
In file included from include/asm-generic/qrwlock.h:17,
from ./arch/mips/include/generated/asm/qrwlock.h:1,
from arch/mips/include/asm/spinlock.h:13,
from include/linux/spinlock.h:90,
from include/linux/ipc.h:5,
from include/uapi/linux/sem.h:5,
from include/linux/sem.h:5,
from include/linux/compat.h:14,
from arch/mips/kernel/asm-offsets.c:12:
include/asm-generic/qspinlock.h:94:29: note: previous definition of 'queued_spin_unlock' was here
94 | static __always_inline void queued_spin_unlock(struct qspinlock *lock)
| ^~~~~~~~~~~~~~~~~~

Bisect log attached.

Guenter

---
# bad: [a4bfd8d46ac357c12529e4eebb6c89502b03ecc9] Add linux-next specific files for 20210209
# good: [92bf22614b21a2706f4993b278017e437f7785b3] Linux 5.11-rc7
git bisect start 'HEAD' 'v5.11-rc7'
# good: [a8eb921ba7e8e77d994a1c6c69c8ef08456ecf53] Merge remote-tracking branch 'crypto/master'
git bisect good a8eb921ba7e8e77d994a1c6c69c8ef08456ecf53
# good: [21d507c41bdf83f6afc0e02976e43c10badfc6cd] Merge remote-tracking branch 'spi/for-next'
git bisect good 21d507c41bdf83f6afc0e02976e43c10badfc6cd
# bad: [30cd4c688a3bcf324f011d7716044b1a4681efc1] Merge remote-tracking branch 'soundwire/next'
git bisect bad 30cd4c688a3bcf324f011d7716044b1a4681efc1
# bad: [c43d2173d3eb4047bb62a7a393a298a1032cce18] Merge remote-tracking branch 'drivers-x86/for-next'
git bisect bad c43d2173d3eb4047bb62a7a393a298a1032cce18
# good: [973e9d8622a6fecc52f639680cbbde1519e1fcf8] Merge remote-tracking branch 'rcu/rcu/next'
git bisect good 973e9d8622a6fecc52f639680cbbde1519e1fcf8
# bad: [7b2aaf51d499e0372cbecafad04582c71ad03c73] Merge remote-tracking branch 'kvm/next'
git bisect bad 7b2aaf51d499e0372cbecafad04582c71ad03c73
# good: [04548ed0206ca895c8edd6a078c20a218423890b] KVM: SVM: Replace hard-coded value with #define
git bisect good 04548ed0206ca895c8edd6a078c20a218423890b
# bad: [92f4d400a407235783afd4399fa26c4c665024b5] KVM: x86/xen: Fix __user pointer handling for hypercall page installation
git bisect bad 92f4d400a407235783afd4399fa26c4c665024b5
# good: [ed5e484b79e8a9b8be714bd85b6fc70bd6dc99a7] KVM: x86/mmu: Ensure forward progress when yielding in TDP MMU iter
git bisect good ed5e484b79e8a9b8be714bd85b6fc70bd6dc99a7
# bad: [f3d4b4b1dc1c5fb9ea17cac14133463bfe72f170] sched: Add cond_resched_rwlock
git bisect bad f3d4b4b1dc1c5fb9ea17cac14133463bfe72f170
# good: [f1b3b06a058bb5c636ffad0afae138fe30775881] KVM: x86/mmu: Clear dirtied pages mask bit before early break
git bisect good f1b3b06a058bb5c636ffad0afae138fe30775881
# bad: [26128cb6c7e6731fe644c687af97733adfdb5ee9] locking/rwlocks: Add contention detection for rwlocks
git bisect bad 26128cb6c7e6731fe644c687af97733adfdb5ee9
# good: [7cca2d0b7e7d9f3cd740d41afdc00051c9b508a0] KVM: x86/mmu: Protect TDP MMU page table memory with RCU
git bisect good 7cca2d0b7e7d9f3cd740d41afdc00051c9b508a0
# first bad commit: [26128cb6c7e6731fe644c687af97733adfdb5ee9] locking/rwlocks: Add contention detection for rwlocks

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