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2bbb6817c0
It is assumed that rcu won't be used once we switch to tickless mode and until we restart the tick. However this is not always true, as in x86-64 where we dereference the idle notifiers after the tick is stopped. To prepare for fixing this, add two new APIs: tick_nohz_idle_enter_norcu() and tick_nohz_idle_exit_norcu(). If no use of RCU is made in the idle loop between tick_nohz_enter_idle() and tick_nohz_exit_idle() calls, the arch must instead call the new *_norcu() version such that the arch doesn't need to call rcu_idle_enter() and rcu_idle_exit(). Otherwise the arch must call tick_nohz_enter_idle() and tick_nohz_exit_idle() and also call explicitly: - rcu_idle_enter() after its last use of RCU before the CPU is put to sleep. - rcu_idle_exit() before the first use of RCU after the CPU is woken up. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Mike Frysinger <vapier@gentoo.org> Cc: Guan Xuetao <gxt@mprc.pku.edu.cn> Cc: David Miller <davem@davemloft.net> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: Paul Mackerras <paulus@samba.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
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| cplb-mpu | ||
| cplb-nompu | ||
| .gitignore | ||
| asm-offsets.c | ||
| bfin_dma_5xx.c | ||
| bfin_gpio.c | ||
| bfin_ksyms.c | ||
| cplbinfo.c | ||
| debug-mmrs.c | ||
| dma-mapping.c | ||
| dumpstack.c | ||
| early_printk.c | ||
| entry.S | ||
| exception.c | ||
| fixed_code.S | ||
| flat.c | ||
| ftrace-entry.S | ||
| ftrace.c | ||
| gptimers.c | ||
| init_task.c | ||
| ipipe.c | ||
| irqchip.c | ||
| kgdb.c | ||
| kgdb_test.c | ||
| Makefile | ||
| module.c | ||
| nmi.c | ||
| perf_event.c | ||
| process.c | ||
| pseudodbg.c | ||
| ptrace.c | ||
| pwm.c | ||
| reboot.c | ||
| setup.c | ||
| shadow_console.c | ||
| signal.c | ||
| stacktrace.c | ||
| sys_bfin.c | ||
| time-ts.c | ||
| time.c | ||
| trace.c | ||
| traps.c | ||
| vmlinux.lds.S | ||