Commit e4970c9c authored by Thomas Gleixner's avatar Thomas Gleixner

Merge branch 'arch/nohz' of...

Merge branch 'arch/nohz' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks into timers/nohz

Pull NOHZ updates from Frederic Weisbecker:

  - Remove TIF_NOHZ from 3 architectures
parents bb6d3fb3 320a4fc2
...@@ -540,11 +540,17 @@ config HAVE_CONTEXT_TRACKING ...@@ -540,11 +540,17 @@ config HAVE_CONTEXT_TRACKING
help help
Provide kernel/user boundaries probes necessary for subsystems Provide kernel/user boundaries probes necessary for subsystems
that need it, such as userspace RCU extended quiescent state. that need it, such as userspace RCU extended quiescent state.
Syscalls need to be wrapped inside user_exit()-user_enter() through Syscalls need to be wrapped inside user_exit()-user_enter(), either
the slow path using TIF_NOHZ flag. Exceptions handlers must be optimized behind static key or through the slow path using TIF_NOHZ
wrapped as well. Irqs are already protected inside flag. Exceptions handlers must be wrapped as well. Irqs are already
rcu_irq_enter/rcu_irq_exit() but preemption or signal handling on protected inside rcu_irq_enter/rcu_irq_exit() but preemption or signal
irq exit still need to be protected. handling on irq exit still need to be protected.
config HAVE_TIF_NOHZ
bool
help
Arch relies on TIF_NOHZ and syscall slow path to implement context
tracking calls to user_enter()/user_exit().
config HAVE_VIRT_CPU_ACCOUNTING config HAVE_VIRT_CPU_ACCOUNTING
bool bool
......
...@@ -141,7 +141,6 @@ extern int vfp_restore_user_hwstate(struct user_vfp *, ...@@ -141,7 +141,6 @@ extern int vfp_restore_user_hwstate(struct user_vfp *,
#define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */ #define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */
#define TIF_SECCOMP 7 /* seccomp syscall filtering active */ #define TIF_SECCOMP 7 /* seccomp syscall filtering active */
#define TIF_NOHZ 12 /* in adaptive nohz mode */
#define TIF_USING_IWMMXT 17 #define TIF_USING_IWMMXT 17
#define TIF_MEMDIE 18 /* is terminating due to OOM killer */ #define TIF_MEMDIE 18 /* is terminating due to OOM killer */
#define TIF_RESTORE_SIGMASK 20 #define TIF_RESTORE_SIGMASK 20
......
...@@ -63,7 +63,6 @@ void arch_release_task_struct(struct task_struct *tsk); ...@@ -63,7 +63,6 @@ void arch_release_task_struct(struct task_struct *tsk);
#define TIF_FOREIGN_FPSTATE 3 /* CPU's FP state is not current's */ #define TIF_FOREIGN_FPSTATE 3 /* CPU's FP state is not current's */
#define TIF_UPROBE 4 /* uprobe breakpoint or singlestep */ #define TIF_UPROBE 4 /* uprobe breakpoint or singlestep */
#define TIF_FSCHECK 5 /* Check FS is USER_DS on return */ #define TIF_FSCHECK 5 /* Check FS is USER_DS on return */
#define TIF_NOHZ 7
#define TIF_SYSCALL_TRACE 8 /* syscall trace active */ #define TIF_SYSCALL_TRACE 8 /* syscall trace active */
#define TIF_SYSCALL_AUDIT 9 /* syscall auditing */ #define TIF_SYSCALL_AUDIT 9 /* syscall auditing */
#define TIF_SYSCALL_TRACEPOINT 10 /* syscall tracepoint for ftrace */ #define TIF_SYSCALL_TRACEPOINT 10 /* syscall tracepoint for ftrace */
...@@ -83,7 +82,6 @@ void arch_release_task_struct(struct task_struct *tsk); ...@@ -83,7 +82,6 @@ void arch_release_task_struct(struct task_struct *tsk);
#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
#define _TIF_FOREIGN_FPSTATE (1 << TIF_FOREIGN_FPSTATE) #define _TIF_FOREIGN_FPSTATE (1 << TIF_FOREIGN_FPSTATE)
#define _TIF_NOHZ (1 << TIF_NOHZ)
#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
...@@ -100,7 +98,7 @@ void arch_release_task_struct(struct task_struct *tsk); ...@@ -100,7 +98,7 @@ void arch_release_task_struct(struct task_struct *tsk);
#define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
_TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP | \ _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP | \
_TIF_NOHZ | _TIF_SYSCALL_EMU) _TIF_SYSCALL_EMU)
#define INIT_THREAD_INFO(tsk) \ #define INIT_THREAD_INFO(tsk) \
{ \ { \
......
...@@ -51,6 +51,7 @@ config MIPS ...@@ -51,6 +51,7 @@ config MIPS
select HAVE_ASM_MODVERSIONS select HAVE_ASM_MODVERSIONS
select HAVE_CBPF_JIT if !64BIT && !CPU_MICROMIPS select HAVE_CBPF_JIT if !64BIT && !CPU_MICROMIPS
select HAVE_CONTEXT_TRACKING select HAVE_CONTEXT_TRACKING
select HAVE_TIF_NOHZ
select HAVE_COPY_THREAD_TLS select HAVE_COPY_THREAD_TLS
select HAVE_C_RECORDMCOUNT select HAVE_C_RECORDMCOUNT
select HAVE_DEBUG_KMEMLEAK select HAVE_DEBUG_KMEMLEAK
......
...@@ -182,6 +182,7 @@ config PPC ...@@ -182,6 +182,7 @@ config PPC
select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13) select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13)
select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2) select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2)
select HAVE_CONTEXT_TRACKING if PPC64 select HAVE_CONTEXT_TRACKING if PPC64
select HAVE_TIF_NOHZ if PPC64
select HAVE_COPY_THREAD_TLS select HAVE_COPY_THREAD_TLS
select HAVE_DEBUG_KMEMLEAK select HAVE_DEBUG_KMEMLEAK
select HAVE_DEBUG_STACKOVERFLOW select HAVE_DEBUG_STACKOVERFLOW
......
...@@ -71,6 +71,7 @@ config SPARC64 ...@@ -71,6 +71,7 @@ config SPARC64
select HAVE_FTRACE_MCOUNT_RECORD select HAVE_FTRACE_MCOUNT_RECORD
select HAVE_SYSCALL_TRACEPOINTS select HAVE_SYSCALL_TRACEPOINTS
select HAVE_CONTEXT_TRACKING select HAVE_CONTEXT_TRACKING
select HAVE_TIF_NOHZ
select HAVE_DEBUG_KMEMLEAK select HAVE_DEBUG_KMEMLEAK
select IOMMU_HELPER select IOMMU_HELPER
select SPARSE_IRQ select SPARSE_IRQ
......
...@@ -92,7 +92,6 @@ struct thread_info { ...@@ -92,7 +92,6 @@ struct thread_info {
#define TIF_NOCPUID 15 /* CPUID is not accessible in userland */ #define TIF_NOCPUID 15 /* CPUID is not accessible in userland */
#define TIF_NOTSC 16 /* TSC is not accessible in userland */ #define TIF_NOTSC 16 /* TSC is not accessible in userland */
#define TIF_IA32 17 /* IA32 compatibility process */ #define TIF_IA32 17 /* IA32 compatibility process */
#define TIF_NOHZ 19 /* in adaptive nohz mode */
#define TIF_MEMDIE 20 /* is terminating due to OOM killer */ #define TIF_MEMDIE 20 /* is terminating due to OOM killer */
#define TIF_POLLING_NRFLAG 21 /* idle is polling for TIF_NEED_RESCHED */ #define TIF_POLLING_NRFLAG 21 /* idle is polling for TIF_NEED_RESCHED */
#define TIF_IO_BITMAP 22 /* uses I/O bitmap */ #define TIF_IO_BITMAP 22 /* uses I/O bitmap */
...@@ -122,7 +121,6 @@ struct thread_info { ...@@ -122,7 +121,6 @@ struct thread_info {
#define _TIF_NOCPUID (1 << TIF_NOCPUID) #define _TIF_NOCPUID (1 << TIF_NOCPUID)
#define _TIF_NOTSC (1 << TIF_NOTSC) #define _TIF_NOTSC (1 << TIF_NOTSC)
#define _TIF_IA32 (1 << TIF_IA32) #define _TIF_IA32 (1 << TIF_IA32)
#define _TIF_NOHZ (1 << TIF_NOHZ)
#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
#define _TIF_IO_BITMAP (1 << TIF_IO_BITMAP) #define _TIF_IO_BITMAP (1 << TIF_IO_BITMAP)
#define _TIF_FORCED_TF (1 << TIF_FORCED_TF) #define _TIF_FORCED_TF (1 << TIF_FORCED_TF)
...@@ -133,14 +131,10 @@ struct thread_info { ...@@ -133,14 +131,10 @@ struct thread_info {
#define _TIF_X32 (1 << TIF_X32) #define _TIF_X32 (1 << TIF_X32)
#define _TIF_FSCHECK (1 << TIF_FSCHECK) #define _TIF_FSCHECK (1 << TIF_FSCHECK)
/* /* Work to do before invoking the actual syscall. */
* work to do in syscall_trace_enter(). Also includes TIF_NOHZ for
* enter_from_user_mode()
*/
#define _TIF_WORK_SYSCALL_ENTRY \ #define _TIF_WORK_SYSCALL_ENTRY \
(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_EMU | _TIF_SYSCALL_AUDIT | \ (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_EMU | _TIF_SYSCALL_AUDIT | \
_TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \ _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT)
_TIF_NOHZ)
/* flags to check in __switch_to() */ /* flags to check in __switch_to() */
#define _TIF_WORK_CTXSW_BASE \ #define _TIF_WORK_CTXSW_BASE \
......
...@@ -198,11 +198,13 @@ void __init context_tracking_cpu_set(int cpu) ...@@ -198,11 +198,13 @@ void __init context_tracking_cpu_set(int cpu)
if (initialized) if (initialized)
return; return;
#ifdef CONFIG_HAVE_TIF_NOHZ
/* /*
* Set TIF_NOHZ to init/0 and let it propagate to all tasks through fork * Set TIF_NOHZ to init/0 and let it propagate to all tasks through fork
* This assumes that init is the only task at this early boot stage. * This assumes that init is the only task at this early boot stage.
*/ */
set_tsk_thread_flag(&init_task, TIF_NOHZ); set_tsk_thread_flag(&init_task, TIF_NOHZ);
#endif
WARN_ON_ONCE(!tasklist_empty()); WARN_ON_ONCE(!tasklist_empty());
initialized = true; initialized = true;
......
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