kernel: remove CONFIG_USE_GENERIC_SMP_HELPERS

We've switched over every architecture that supports SMP to it, so
remove the new useless config variable.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Jan Kara <jack@suse.cz>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

25 files changed, 6 insertions, 33 deletions

diff --git a/arch/Kconfig b/arch/Kconfig
index ded747c7b74c..f1cf895c040f 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -207,9 +207,6 @@ config HAVE_DMA_ATTRS
 config HAVE_DMA_CONTIGUOUS
         bool
 
-config USE_GENERIC_SMP_HELPERS
-        bool
-
 config GENERIC_SMP_IDLE_THREAD
        bool
 
diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index 35a300d4a9fb..8d2a4833acda 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -522,7 +522,6 @@ config ARCH_MAY_HAVE_PC_FDC
 config SMP
         bool "Symmetric multi-processing support"
         depends on ALPHA_SABLE || ALPHA_LYNX || ALPHA_RAWHIDE || ALPHA_DP264 || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_GENERIC || ALPHA_SHARK || ALPHA_MARVEL
-        select USE_GENERIC_SMP_HELPERS
         ---help---
           This enables support for systems with more than one CPU. If you have
           a system with only one CPU, like most personal computers, say N. If
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index 5ede5460c806..2ee0c9bfd032 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -125,7 +125,6 @@ config ARC_PLAT_NEEDS_CPU_TO_DMA
 config SMP
         bool "Symmetric Multi-Processing (Incomplete)"
         default n
-        select USE_GENERIC_SMP_HELPERS
         help
           This enables support for systems with more than one CPU. If you have
           a system with only one CPU, like most personal computers, say N. If
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 603d661b445d..00c1ff45a158 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1432,7 +1432,6 @@ config SMP
         depends on GENERIC_CLOCKEVENTS
         depends on HAVE_SMP
         depends on MMU || ARM_MPU
-        select USE_GENERIC_SMP_HELPERS
         help
           This enables support for systems with more than one CPU. If you have
           a system with only one CPU, like most personal computers, say N. If
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index bb0bf1bfc05d..9714fe0403b7 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -143,7 +143,6 @@ config CPU_BIG_ENDIAN
 
 config SMP
         bool "Symmetric Multi-Processing"
-        select USE_GENERIC_SMP_HELPERS
         help
           This enables support for systems with more than one CPU.  If
           you say N here, the kernel will run on single and
diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index e887b57c3176..9ceccef9c649 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -34,7 +34,6 @@ config BLACKFIN
         select ARCH_WANT_IPC_PARSE_VERSION
         select GENERIC_ATOMIC64
         select GENERIC_IRQ_PROBE
-        select USE_GENERIC_SMP_HELPERS if SMP
         select HAVE_NMI_WATCHDOG if NMI_WATCHDOG
         select GENERIC_SMP_IDLE_THREAD
         select ARCH_USES_GETTIMEOFFSET if !GENERIC_CLOCKEVENTS
diff --git a/arch/hexagon/Kconfig b/arch/hexagon/Kconfig
index 99041b07e610..09df2608f40a 100644
--- a/arch/hexagon/Kconfig
+++ b/arch/hexagon/Kconfig
@@ -4,7 +4,6 @@ comment "Linux Kernel Configuration for Hexagon"
 config HEXAGON
         def_bool y
         select HAVE_OPROFILE
-        select USE_GENERIC_SMP_HELPERS if SMP
         # Other pending projects/to-do items.
         # select HAVE_REGS_AND_STACK_ACCESS_API
         # select HAVE_HW_BREAKPOINT if PERF_EVENTS
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 7740ab10a171..dfe85e92ca2e 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -343,7 +343,6 @@ config FORCE_MAX_ZONEORDER
 
 config SMP
         bool "Symmetric multi-processing support"
-        select USE_GENERIC_SMP_HELPERS
         help
           This enables support for systems with more than one CPU. If you have
           a system with only one CPU, say N.  If you have a system with more
diff --git a/arch/m32r/Kconfig b/arch/m32r/Kconfig
index 75661fbf4529..09ef94a8a7c3 100644
--- a/arch/m32r/Kconfig
+++ b/arch/m32r/Kconfig
@@ -275,7 +275,6 @@ source "kernel/Kconfig.preempt"
 
 config SMP
         bool "Symmetric multi-processing support"
-        select USE_GENERIC_SMP_HELPERS
         ---help---
           This enables support for systems with more than one CPU. If you have
           a system with only one CPU, like most personal computers, say N. If
diff --git a/arch/metag/Kconfig b/arch/metag/Kconfig
index 36368eb07e13..e56abd2c1b4f 100644
--- a/arch/metag/Kconfig
+++ b/arch/metag/Kconfig
@@ -111,7 +111,6 @@ config METAG_META21
 config SMP
         bool "Symmetric multi-processing support"
         depends on METAG_META21 && METAG_META21_MMU
-        select USE_GENERIC_SMP_HELPERS
         help
           This enables support for systems with more than one thread running
           Linux. If you have a system with only one thread running Linux,
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 17cc7ff8458c..867d7db11581 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -2125,7 +2125,6 @@ source "mm/Kconfig"
 config SMP
         bool "Multi-Processing support"
         depends on SYS_SUPPORTS_SMP
-        select USE_GENERIC_SMP_HELPERS
         help
           This enables support for systems with more than one CPU. If you have
           a system with only one CPU, like most personal computers, say N. If
diff --git a/arch/mn10300/Kconfig b/arch/mn10300/Kconfig
index 6aaa1607001a..8bde9237d13b 100644
--- a/arch/mn10300/Kconfig
+++ b/arch/mn10300/Kconfig
@@ -181,7 +181,6 @@ endmenu
 config SMP
         bool "Symmetric multi-processing support"
         default y
-        select USE_GENERIC_SMP_HELPERS
         depends on MN10300_PROC_MN2WS0038 || MN10300_PROC_MN2WS0050
         ---help---
           This enables support for systems with more than one CPU. If you have
diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index 7dcde539d61e..c03567a9a915 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -226,7 +226,6 @@ endchoice
 
 config SMP
         bool "Symmetric multi-processing support"
-        select USE_GENERIC_SMP_HELPERS
         ---help---
           This enables support for systems with more than one CPU. If you have
           a system with only one CPU, like most personal computers, say N. If
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 2f898d63eb96..4740b0a15fa8 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -106,7 +106,6 @@ config PPC
         select HAVE_MEMBLOCK_NODE_MAP
         select HAVE_DMA_ATTRS
         select HAVE_DMA_API_DEBUG
-        select USE_GENERIC_SMP_HELPERS if SMP
         select HAVE_OPROFILE
         select HAVE_DEBUG_KMEMLEAK
         select GENERIC_ATOMIC64 if PPC32
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index f75d7e517927..314fced4fc14 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -141,7 +141,6 @@ config S390
         select OLD_SIGACTION
         select OLD_SIGSUSPEND3
         select SYSCTL_EXCEPTION_TRACE
-        select USE_GENERIC_SMP_HELPERS if SMP
         select VIRT_CPU_ACCOUNTING
         select VIRT_TO_BUS
 
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 224f4bc9925e..e78561bc30ef 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -711,7 +711,6 @@ config CC_STACKPROTECTOR
 config SMP
         bool "Symmetric multi-processing support"
         depends on SYS_SUPPORTS_SMP
-        select USE_GENERIC_SMP_HELPERS
         ---help---
           This enables support for systems with more than one CPU. If you have
           a system with only one CPU, like most personal computers, say N. If
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 78c4fdb91bc5..8591b201d9cc 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -28,7 +28,6 @@ config SPARC
         select HAVE_ARCH_JUMP_LABEL
         select GENERIC_IRQ_SHOW
         select ARCH_WANT_IPC_PARSE_VERSION
-        select USE_GENERIC_SMP_HELPERS if SMP
         select GENERIC_PCI_IOMAP
         select HAVE_NMI_WATCHDOG if SPARC64
         select HAVE_BPF_JIT
diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig
index d45a2c48f185..b3692ce78f90 100644
--- a/arch/tile/Kconfig
+++ b/arch/tile/Kconfig
@@ -8,7 +8,6 @@ config TILE
         select HAVE_KVM if !TILEGX
         select GENERIC_FIND_FIRST_BIT
         select SYSCTL_EXCEPTION_TRACE
-        select USE_GENERIC_SMP_HELPERS
         select CC_OPTIMIZE_FOR_SIZE
         select HAVE_DEBUG_KMEMLEAK
         select GENERIC_IRQ_PROBE
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index af5513e5798a..83f521aa103f 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -90,7 +90,6 @@ config X86
         select GENERIC_IRQ_SHOW
         select GENERIC_CLOCKEVENTS_MIN_ADJUST
         select IRQ_FORCED_THREADING
-        select USE_GENERIC_SMP_HELPERS if SMP
         select HAVE_BPF_JIT if X86_64
         select HAVE_ARCH_TRANSPARENT_HUGEPAGE
         select CLKEVT_I8253
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 88d4e864d4c0..c661896e2465 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -319,7 +319,7 @@ void __blk_mq_end_io(struct request *rq, int error)
                 blk_mq_complete_request(rq, error);
 }
 
-#if defined(CONFIG_SMP) && defined(CONFIG_USE_GENERIC_SMP_HELPERS)
+#if defined(CONFIG_SMP)
 
 /*
  * Called with interrupts disabled.
@@ -361,7 +361,7 @@ static int ipi_remote_cpu(struct blk_mq_ctx *ctx, const int cpu,
 
         return true;
 }
-#else /* CONFIG_SMP && CONFIG_USE_GENERIC_SMP_HELPERS */
+#else /* CONFIG_SMP */
 static int ipi_remote_cpu(struct blk_mq_ctx *ctx, const int cpu,
                           struct request *rq, const int error)
 {
diff --git a/block/blk-softirq.c b/block/blk-softirq.c
index ce4b8bfd3d27..57790c1a97eb 100644
--- a/block/blk-softirq.c
+++ b/block/blk-softirq.c
@@ -36,7 +36,7 @@ static void blk_done_softirq(struct softirq_action *h)
         }
 }
 
-#if defined(CONFIG_SMP) && defined(CONFIG_USE_GENERIC_SMP_HELPERS)
+#ifdef CONFIG_SMP
 static void trigger_softirq(void *data)
 {
         struct request *rq = data;
@@ -71,7 +71,7 @@ static int raise_blk_irq(int cpu, struct request *rq)
 
         return 1;
 }
-#else /* CONFIG_SMP && CONFIG_USE_GENERIC_SMP_HELPERS */
+#else /* CONFIG_SMP */
 static int raise_blk_irq(int cpu, struct request *rq)
 {
         return 1;
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 4f8c4d90ec73..97779522472f 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -288,7 +288,7 @@ static ssize_t
 queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count)
 {
         ssize_t ret = -EINVAL;
-#if defined(CONFIG_USE_GENERIC_SMP_HELPERS)
+#ifdef CONFIG_SMP
         unsigned long val;
 
         ret = queue_var_store(&val, page, count);
diff --git a/include/linux/smp.h b/include/linux/smp.h
index 731f5237d5f4..78851513030d 100644
--- a/include/linux/smp.h
+++ b/include/linux/smp.h
@@ -106,14 +106,10 @@ void kick_all_cpus_sync(void);
 /*
  * Generic and arch helpers
  */
-#ifdef CONFIG_USE_GENERIC_SMP_HELPERS
 void __init call_function_init(void);
 void generic_smp_call_function_single_interrupt(void);
 #define generic_smp_call_function_interrupt \
         generic_smp_call_function_single_interrupt
-#else
-static inline void call_function_init(void) { }
-#endif
 
 /*
  * Mark the boot cpu "online" so that it can call console drivers in
diff --git a/kernel/Kconfig.hz b/kernel/Kconfig.hz
index 94fabd534b03..2a202a846757 100644
--- a/kernel/Kconfig.hz
+++ b/kernel/Kconfig.hz
@@ -55,4 +55,4 @@ config HZ
         default 1000 if HZ_1000
 
 config SCHED_HRTICK
-        def_bool HIGH_RES_TIMERS && (!SMP || USE_GENERIC_SMP_HELPERS)
+        def_bool HIGH_RES_TIMERS
diff --git a/kernel/smp.c b/kernel/smp.c
index 46116100f0ee..1c194e20e943 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -15,7 +15,6 @@
 
 #include "smpboot.h"
 
-#ifdef CONFIG_USE_GENERIC_SMP_HELPERS
 enum {
         CSD_FLAG_LOCK           = 0x01,
         CSD_FLAG_WAIT           = 0x02,
@@ -464,7 +463,6 @@ int smp_call_function(smp_call_func_t func, void *info, int wait)
         return 0;
 }
 EXPORT_SYMBOL(smp_call_function);
-#endif /* USE_GENERIC_SMP_HELPERS */
 
 /* Setup configured maximum number of CPUs to activate */
 unsigned int setup_max_cpus = NR_CPUS;