Re: [PATCH RFC tip/core/rcu] Make SRCU be once again optional

From: Arnd Bergmann
Date: Wed Jan 17 2018 - 05:29:37 EST

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On Wed, Jan 17, 2018 at 12:57 AM, Paul E. McKenney
<paulmck@xxxxxxxxxxxxxxxxxx> wrote:
> On Wed, Jan 17, 2018 at 12:03:18AM +0100, Arnd Bergmann wrote:
>> On Tue, Jan 16, 2018 at 11:55 PM, Arnd Bergmann <arnd@xxxxxxxx> wrote:
>>
>> >
>> > That fixed the first warning for me, doing the same thing for all three
>> > fixed the rest
>>
>> Now with my workaround applied and the original randconfig that triggered
>> the failure, I get another problem:
>>
>> drivers/base/power/wakeup.c:68:1: error: data definition has no type
>> or storage class [-Werror]
>> DEFINE_STATIC_SRCU(wakeup_srcu);
>>
>> Evidently there is at least one driver that uses SRCU but doesn't 'select SRCU'
>> in Kconfig. There are probably others that just haven't been found.
>
> Does adding "select SRCU" on "config PM_SLEEP" in kernel/power/Kconfig
> fix this?

I'm sure it does, but the point I was making is that we probably have a number
of those, and would never find the other ones through the current build test
setup.

I've now tried disabling a ridiculous number of options to come up with a
setup that never enables SRCU. Interestingly, that also means we don't
get the drivers/base/power/wakeup.c problem in 'allmodconfig', though
I did get a link-time error:

kernel/locking/lockdep.o: In function `lockdep_rcu_suspicious':
lockdep.c:(.text+0x2704): undefined reference to `rcu_scheduler_active'
kernel/rcu/update.o: In function `debug_lockdep_rcu_enabled':
update.c:(.text+0x40): undefined reference to `rcu_scheduler_active'
kernel/rcu/update.o: In function `rcu_read_lock_bh_held':
update.c:(.text+0xa8): undefined reference to `rcu_scheduler_active'
kernel/rcu/update.o: In function `rcu_read_lock_sched_held':
update.c:(.text+0xce0): undefined reference to `rcu_scheduler_active'
kernel/rcu/update.o: In function `rcu_read_lock_held':
update.c:(.text+0xd40): undefined reference to `rcu_scheduler_active'
kernel/rcu/update.o:update.c:(.text+0x10ac): more undefined references
to `rcu_scheduler_active' follow
mm/kmemleak.o: In function `kmemleak_scan':
kmemleak.c:(.text+0x1768): undefined reference to `__end_ro_after_init'
kmemleak.c:(.text+0x176c): undefined reference to `__start_ro_after_init'
Makefile:1029: recipe for target 'vmlinux' failed

Turning off lockdep and kmemleak gives me a working allmodconfig build.
I'm doing some more testing on ARM, but it looks like this is a dark corner
of the randconfig state space that I'm not sure I want to explore more.

Doing an hour of randconfig builds, I already found exactly two missing
'select SRCU':

ERROR: "__srcu_read_unlock" [drivers/infiniband/core/ib_uverbs.ko] undefined!
drivers/base/power/wakeup.c:68:1: error: type defaults to 'int' in
declaration of 'DEFINE_STATIC_SRCU' [-Werror=implicit-int]

See below for my test patch. Without COMMON_CLK, PM_SLEEP
and BLOCK, the number useful configurations is very limited.

Arnd

diff --git a/arch/Kconfig b/arch/Kconfig
index 9ba8c3df9ff6..d1b0ac3c9f4d 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -91,6 +91,7 @@ config STATIC_KEYS_SELFTEST
config OPTPROBES
def_bool y
depends on KPROBES && HAVE_OPTPROBES
+ depends on BROKEN || !PREEMPT
select TASKS_RCU if PREEMPT

config KPROBES_ON_FTRACE
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 3d349b4f709e..ba397fc7e9d5 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -330,7 +330,7 @@ choice

config ARCH_MULTIPLATFORM
bool "Allow multiple platforms to be selected"
- depends on MMU
+ depends on MMU && BROKEN
select ARM_HAS_SG_CHAIN
select ARM_PATCH_PHYS_VIRT
select AUTO_ZRELADDR
@@ -345,7 +345,7 @@ config ARCH_MULTIPLATFORM

config ARM_SINGLE_ARMV7M
bool "ARMv7-M based platforms (Cortex-M0/M3/M4)"
- depends on !MMU
+ depends on !MMU && BROKEN
select ARM_NVIC
select AUTO_ZRELADDR
select TIMER_OF
@@ -463,6 +463,7 @@ config ARCH_IXP4XX

config ARCH_DOVE
bool "Marvell Dove"
+ depends on BROKEN
select CPU_PJ4
select GENERIC_CLOCKEVENTS
select GPIOLIB
@@ -506,6 +507,7 @@ config ARCH_W90X900

config ARCH_LPC32XX
bool "NXP LPC32XX"
+ depends on BROKEN
select ARM_AMBA
select CLKDEV_LOOKUP
select CLKSRC_LPC32XX
@@ -522,6 +524,7 @@ config ARCH_LPC32XX
config ARCH_PXA
bool "PXA2xx/PXA3xx-based"
depends on MMU
+ depends on BROKEN
select ARCH_MTD_XIP
select ARM_CPU_SUSPEND if PM
select AUTO_ZRELADDR
@@ -563,6 +566,7 @@ config ARCH_RPC

config ARCH_SA1100
bool "SA1100-based"
+ depends on BROKEN
select ARCH_MTD_XIP
select ARCH_SPARSEMEM_ENABLE
select CLKDEV_LOOKUP
@@ -584,6 +588,7 @@ config ARCH_SA1100

config ARCH_S3C24XX
bool "Samsung S3C24XX SoCs"
+ depends on BROKEN
select ATAGS
select CLKDEV_LOOKUP
select CLKSRC_SAMSUNG_PWM
diff --git a/arch/arm/kvm/Kconfig b/arch/arm/kvm/Kconfig
index e2bd35b6780c..b29a10a80d97 100644
--- a/arch/arm/kvm/Kconfig
+++ b/arch/arm/kvm/Kconfig
@@ -20,7 +20,7 @@ if VIRTUALIZATION

config KVM
bool "Kernel-based Virtual Machine (KVM) support"
- depends on MMU && OF
+ depends on MMU && OF && BROKEN
select PREEMPT_NOTIFIERS
select ANON_INODES
select ARM_GIC
diff --git a/block/Kconfig b/block/Kconfig
index 28ec55752b68..c3d807fa91b6 100644
--- a/block/Kconfig
+++ b/block/Kconfig
@@ -4,6 +4,7 @@
#
menuconfig BLOCK
bool "Enable the block layer" if EXPERT
+ depends on BROKEN
default y
select SBITMAP
select SRCU
diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 98ce9fc6e6c0..07fdc293134d 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -8,6 +8,7 @@ config HAVE_CLK_PREPARE

config COMMON_CLK
bool
+ depends on BROKEN
select HAVE_CLK_PREPARE
select CLKDEV_LOOKUP
select SRCU
diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig
index d8addbce40bc..244b4c241811 100644
--- a/drivers/cpufreq/Kconfig
+++ b/drivers/cpufreq/Kconfig
@@ -2,6 +2,7 @@ menu "CPU Frequency scaling"

config CPU_FREQ
bool "CPU Frequency scaling"
+ depends on BROKEN
select SRCU
help
CPU Frequency scaling allows you to change the clock speed of
diff --git a/drivers/dax/Kconfig b/drivers/dax/Kconfig
index b79aa8f7a497..efd94826c020 100644
--- a/drivers/dax/Kconfig
+++ b/drivers/dax/Kconfig
@@ -1,5 +1,6 @@
menuconfig DAX
tristate "DAX: direct access to differentiated memory"
+ depends on BROKEN
select SRCU
default m if NVDIMM_DAX

diff --git a/drivers/devfreq/Kconfig b/drivers/devfreq/Kconfig
index 6a172d338f6d..cd67f2ac8803 100644
--- a/drivers/devfreq/Kconfig
+++ b/drivers/devfreq/Kconfig
@@ -1,5 +1,6 @@
menuconfig PM_DEVFREQ
bool "Generic Dynamic Voltage and Frequency Scaling (DVFS) support"
+ depends on BROKEN
select SRCU
select PM_OPP
help
diff --git a/drivers/gpu/drm/amd/amdgpu/Kconfig
b/drivers/gpu/drm/amd/amdgpu/Kconfig
index e8af1f5e8a79..20d3bcd5a638 100644
--- a/drivers/gpu/drm/amd/amdgpu/Kconfig
+++ b/drivers/gpu/drm/amd/amdgpu/Kconfig
@@ -25,7 +25,7 @@ config DRM_AMDGPU_CIK

config DRM_AMDGPU_USERPTR
bool "Always enable userptr write support"
- depends on DRM_AMDGPU
+ depends on DRM_AMDGPU && BROKEN
select MMU_NOTIFIER
help
This option selects CONFIG_MMU_NOTIFIER if it isn't already
diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
index dfd95889f4b7..a8db7a547aab 100644
--- a/drivers/gpu/drm/i915/Kconfig
+++ b/drivers/gpu/drm/i915/Kconfig
@@ -84,7 +84,7 @@ config DRM_I915_COMPRESS_ERROR

config DRM_I915_USERPTR
bool "Always enable userptr support"
- depends on DRM_I915
+ depends on DRM_I915 && BROKEN
select MMU_NOTIFIER
default y
help
diff --git a/drivers/gpu/drm/radeon/Kconfig b/drivers/gpu/drm/radeon/Kconfig
index 9909f5c68d76..34e1aaa60abd 100644
--- a/drivers/gpu/drm/radeon/Kconfig
+++ b/drivers/gpu/drm/radeon/Kconfig
@@ -1,6 +1,6 @@
config DRM_RADEON_USERPTR
bool "Always enable userptr support"
- depends on DRM_RADEON
+ depends on DRM_RADEON && BROKEN
select MMU_NOTIFIER
help
This option selects CONFIG_MMU_NOTIFIER if it isn't already
diff --git a/drivers/hwtracing/coresight/Kconfig
b/drivers/hwtracing/coresight/Kconfig
index ef9cb3c164e1..ea6da47c136a 100644
--- a/drivers/hwtracing/coresight/Kconfig
+++ b/drivers/hwtracing/coresight/Kconfig
@@ -3,6 +3,7 @@
#
menuconfig CORESIGHT
bool "CoreSight Tracing Support"
+ depends on BROKEN
select ARM_AMBA
select PERF_EVENTS
help
diff --git a/drivers/hwtracing/stm/Kconfig b/drivers/hwtracing/stm/Kconfig
index 723e2d90083d..0e0080d28ad5 100644
--- a/drivers/hwtracing/stm/Kconfig
+++ b/drivers/hwtracing/stm/Kconfig
@@ -1,5 +1,6 @@
config STM
tristate "System Trace Module devices"
+ depends on BROKEN
select CONFIGFS_FS
select SRCU
help
diff --git a/drivers/infiniband/Kconfig b/drivers/infiniband/Kconfig
index 5cd700421695..f64fe02a5858 100644
--- a/drivers/infiniband/Kconfig
+++ b/drivers/infiniband/Kconfig
@@ -51,7 +51,7 @@ config INFINIBAND_USER_MEM

config INFINIBAND_ON_DEMAND_PAGING
bool "InfiniBand on-demand paging support"
- depends on INFINIBAND_USER_MEM
+ depends on INFINIBAND_USER_MEM && BROKEN
select MMU_NOTIFIER
default y
---help---
diff --git a/drivers/infiniband/hw/hfi1/Kconfig
b/drivers/infiniband/hw/hfi1/Kconfig
index 7b146b67a80f..b41fd3506be9 100644
--- a/drivers/infiniband/hw/hfi1/Kconfig
+++ b/drivers/infiniband/hw/hfi1/Kconfig
@@ -1,6 +1,6 @@
config INFINIBAND_HFI1
tristate "Intel OPA Gen1 support"
- depends on X86_64 && INFINIBAND_RDMAVT && I2C
+ depends on X86_64 && INFINIBAND_RDMAVT && I2C && BROKEN
select MMU_NOTIFIER
select CRC32
select I2C_ALGOBIT
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index f3a21343e636..48c4d5a321da 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -128,7 +128,7 @@ config AMD_IOMMU

config AMD_IOMMU_V2
tristate "AMD IOMMU Version 2 driver"
- depends on AMD_IOMMU
+ depends on AMD_IOMMU && BROKEN
select MMU_NOTIFIER
---help---
This option enables support for the AMD IOMMUv2 features of the IOMMU
@@ -154,7 +154,7 @@ config INTEL_IOMMU

config INTEL_IOMMU_SVM
bool "Support for Shared Virtual Memory with Intel IOMMU"
- depends on INTEL_IOMMU && X86
+ depends on INTEL_IOMMU && X86 && BROKEN
select PCI_PASID
select MMU_NOTIFIER
help
diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig
index 2c8ac3688815..8b0ae082872a 100644
--- a/drivers/md/Kconfig
+++ b/drivers/md/Kconfig
@@ -4,7 +4,7 @@

menuconfig MD
bool "Multiple devices driver support (RAID and LVM)"
- depends on BLOCK
+ depends on BLOCK && BROKEN
select SRCU
help
Support multiple physical spindles through a single logical device.
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 7c0fa24f9067..eea5f553860a 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -284,7 +284,7 @@ config QCOM_COINCELL

config SGI_GRU
tristate "SGI GRU driver"
- depends on X86_UV && SMP
+ depends on X86_UV && SMP && BROKEN
default n
select MMU_NOTIFIER
---help---
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 944ec3c9282c..bba60a8fd482 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -238,6 +238,7 @@ config MACSEC

config NETCONSOLE
tristate "Network console logging support"
+ depends on BROKEN
---help---
If you want to log kernel messages over the network, enable this.
See <file:Documentation/networking/netconsole.txt> for details.
@@ -254,6 +255,7 @@ config NETCONSOLE_DYNAMIC

config NETPOLL
def_bool NETCONSOLE
+ depends on BROKEN
select SRCU

config NET_POLL_CONTROLLER
diff --git a/drivers/opp/Kconfig b/drivers/opp/Kconfig
index a7fbb93f302c..06894a6fa24c 100644
--- a/drivers/opp/Kconfig
+++ b/drivers/opp/Kconfig
@@ -1,5 +1,6 @@
config PM_OPP
bool
+ depends on BROKEN
select SRCU
---help---
SOCs have a standard set of tuples consisting of frequency and
diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index e5d0c28372ea..9761331e0505 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -146,7 +146,7 @@ config XEN_XENBUS_FRONTEND

config XEN_GNTDEV
tristate "userspace grant access device driver"
- depends on XEN
+ depends on XEN && BROKEN
default m
select MMU_NOTIFIER
help
diff --git a/fs/btrfs/Kconfig b/fs/btrfs/Kconfig
index 273351ee4c46..66a0d7688630 100644
--- a/fs/btrfs/Kconfig
+++ b/fs/btrfs/Kconfig
@@ -1,5 +1,6 @@
config BTRFS_FS
tristate "Btrfs filesystem support"
+ depends on BROKEN
select CRYPTO
select CRYPTO_CRC32C
select ZLIB_INFLATE
diff --git a/fs/notify/Kconfig b/fs/notify/Kconfig
index 2a24249b30af..598ceab78b62 100644
--- a/fs/notify/Kconfig
+++ b/fs/notify/Kconfig
@@ -1,5 +1,6 @@
config FSNOTIFY
def_bool n
+ depends on BROKEN
select SRCU

source "fs/notify/dnotify/Kconfig"
diff --git a/fs/notify/dnotify/Kconfig b/fs/notify/dnotify/Kconfig
index f9c1ca139d8f..f6964a9a5eb9 100644
--- a/fs/notify/dnotify/Kconfig
+++ b/fs/notify/dnotify/Kconfig
@@ -1,5 +1,6 @@
config DNOTIFY
bool "Dnotify support"
+ depends on BROKEN
select FSNOTIFY
default y
help
diff --git a/fs/notify/fanotify/Kconfig b/fs/notify/fanotify/Kconfig
index 41355ce74ac0..fcb2edd643d4 100644
--- a/fs/notify/fanotify/Kconfig
+++ b/fs/notify/fanotify/Kconfig
@@ -1,5 +1,6 @@
config FANOTIFY
bool "Filesystem wide access notification"
+ depends on BROKEN
select FSNOTIFY
select ANON_INODES
default n
diff --git a/fs/notify/inotify/Kconfig b/fs/notify/inotify/Kconfig
index b981fc0c8379..916cbd5569fa 100644
--- a/fs/notify/inotify/Kconfig
+++ b/fs/notify/inotify/Kconfig
@@ -1,5 +1,6 @@
config INOTIFY_USER
bool "Inotify support for userspace"
+ depends on BROKEN
select ANON_INODES
select FSNOTIFY
default y
diff --git a/fs/quota/Kconfig b/fs/quota/Kconfig
index 4a09975aac90..dbf3f3cdcbd8 100644
--- a/fs/quota/Kconfig
+++ b/fs/quota/Kconfig
@@ -4,6 +4,7 @@

config QUOTA
bool "Quota support"
+ depends on BROKEN
select QUOTACTL
select SRCU
help
diff --git a/include/linux/srcu.h b/include/linux/srcu.h
index 62be8966e837..587128fcec05 100644
--- a/include/linux/srcu.h
+++ b/include/linux/srcu.h
@@ -94,9 +94,11 @@ void synchronize_srcu(struct srcu_struct *sp);
*/
static inline int srcu_read_lock_held(struct srcu_struct *sp)
{
- if (!debug_lockdep_rcu_enabled())
- return 1;
+#ifdef CONFIG_SRCU
return lock_is_held(&sp->dep_map);
+#else /* #ifdef CONFIG_PROVE_RCU */
+ return 1;
+#endif /* #else #ifdef CONFIG_PROVE_RCU */
}

#else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
@@ -157,7 +159,9 @@ static inline int srcu_read_lock(struct
srcu_struct *sp) __acquires(sp)
int retval;

retval = __srcu_read_lock(sp);
+#ifdef CONFIG_SRCU
rcu_lock_acquire(&(sp)->dep_map);
+#endif
return retval;
}

@@ -171,7 +175,9 @@ static inline int srcu_read_lock(struct
srcu_struct *sp) __acquires(sp)
static inline void srcu_read_unlock(struct srcu_struct *sp, int idx)
__releases(sp)
{
+#ifdef CONFIG_SRCU
rcu_lock_release(&(sp)->dep_map);
+#endif
__srcu_read_unlock(sp, idx);
}

diff --git a/init/Kconfig b/init/Kconfig
index a9a2e2c86671..b68adf1b1373 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -311,12 +311,12 @@ config AUDITSYSCALL

config AUDIT_WATCH
def_bool y
- depends on AUDITSYSCALL
+ depends on AUDITSYSCALL && BROKEN
select FSNOTIFY

config AUDIT_TREE
def_bool y
- depends on AUDITSYSCALL
+ depends on AUDITSYSCALL && BROKEN
select FSNOTIFY

source "kernel/irq/Kconfig"
@@ -1443,6 +1443,7 @@ menu "Kernel Performance Events And Counters"
config PERF_EVENTS
bool "Kernel performance events and counters"
default y if PROFILING
+ depends on BROKEN
depends on HAVE_PERF_EVENTS
select ANON_INODES
select IRQ_WORK
diff --git a/kernel/rcu/Kconfig b/kernel/rcu/Kconfig
index 9210379c0353..4df64e8ca66a 100644
--- a/kernel/rcu/Kconfig
+++ b/kernel/rcu/Kconfig
@@ -51,6 +51,7 @@ config RCU_EXPERT

config SRCU
bool
+ depends on BROKEN
help
This option selects the sleepable version of RCU. This version
permits arbitrary sleeping or blocking within RCU read-side critical
@@ -70,6 +71,7 @@ config TREE_SRCU

config TASKS_RCU
def_bool PREEMPT
+ depends on BROKEN
select SRCU
help
This option enables a task-based RCU implementation that uses
diff --git a/kernel/rcu/Kconfig.debug b/kernel/rcu/Kconfig.debug
index 0ec7d1d33a14..a66eb614ae39 100644
--- a/kernel/rcu/Kconfig.debug
+++ b/kernel/rcu/Kconfig.debug
@@ -13,7 +13,7 @@ config TORTURE_TEST

config RCU_PERF_TEST
tristate "performance tests for RCU"
- depends on DEBUG_KERNEL
+ depends on DEBUG_KERNEL && BROKEN
select TORTURE_TEST
select SRCU
select TASKS_RCU
@@ -30,7 +30,7 @@ config RCU_PERF_TEST

config RCU_TORTURE_TEST
tristate "torture tests for RCU"
- depends on DEBUG_KERNEL
+ depends on DEBUG_KERNEL && BROKEN
select TORTURE_TEST
select SRCU
select TASKS_RCU
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 7114c885a78a..b52390595727 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -131,6 +131,7 @@ if FTRACE
config FUNCTION_TRACER
bool "Kernel Function Tracer"
depends on HAVE_FUNCTION_TRACER
+ depends on BROKEN || !PREEMPT
select KALLSYMS
select GENERIC_TRACER
select CONTEXT_SWITCH_TRACER
@@ -395,7 +396,7 @@ config BRANCH_TRACER

config STACK_TRACER
bool "Trace max stack"
- depends on HAVE_FUNCTION_TRACER
+ depends on HAVE_FUNCTION_TRACER && BROKEN
select FUNCTION_TRACER
select STACKTRACE
select KALLSYMS
diff --git a/mm/Kconfig b/mm/Kconfig
index c782e8fb7235..17c9e82935da 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -300,6 +300,7 @@ config VIRT_TO_BUS

config MMU_NOTIFIER
bool
+ depends on BROKEN
select SRCU

config KSM
@@ -706,7 +707,7 @@ config HMM

config HMM_MIRROR
bool "HMM mirror CPU page table into a device page table"
- depends on ARCH_HAS_HMM
+ depends on ARCH_HAS_HMM && BROKEN
select MMU_NOTIFIER
select HMM
help
diff --git a/security/tomoyo/Kconfig b/security/tomoyo/Kconfig
index 404dce66952a..3a664764fb19 100644
--- a/security/tomoyo/Kconfig
+++ b/security/tomoyo/Kconfig
@@ -1,5 +1,6 @@
config SECURITY_TOMOYO
- bool "TOMOYO Linux Support"
+ bool "TOMOYO Linux Support"
+ depends on BROKEN
depends on SECURITY
depends on NET
select SECURITYFS

Next message: Luis de Bethencourt: "[PATCH] powercap/intel_rapl: Fix trailing semicolon"
Previous message: Suzuki K Poulose: "Re: [PATCH 3/3] arm64: Add work around for Arm Cortex-A55 Erratum 1024718"
In reply to: Paul E. McKenney: "Re: [PATCH RFC tip/core/rcu] Make SRCU be once again optional"
Next in thread: Josh Triplett: "Re: [PATCH RFC tip/core/rcu] Make SRCU be once again optional"
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