Arun KS 3d6357de8a mm: reference totalram_pages and managed_pages once per function ... Patch series "mm: convert totalram_pages, totalhigh_pages and managed pages to atomic", v5. This series converts totalram_pages, totalhigh_pages and zone->managed_pages to atomic variables. totalram_pages, zone->managed_pages and totalhigh_pages updates are protected by managed_page_count_lock, but readers never care about it. Convert these variables to atomic to avoid readers potentially seeing a store tear. Main motivation was that managed_page_count_lock handling was complicating things. It was discussed in length here, https://lore.kernel.org/patchwork/patch/995739/#1181785 It seemes better to remove the lock and convert variables to atomic. With the change, preventing poteintial store-to-read tearing comes as a bonus. This patch (of 4): This is in preparation to a later patch which converts totalram_pages and zone->managed_pages to atomic variables. Please note that re-reading the value might lead to a different value and as such it could lead to unexpected behavior. There are no known bugs as a result of the current code but it is better to prevent from them in principle. Link: http://lkml.kernel.org/r/1542090790-21750-2-git-send-email-arunks@codeaurora.org Signed-off-by: Arun KS <arunks@codeaurora.org> Reviewed-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Reviewed-by: David Hildenbrand <david@redhat.com> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Pavel Tatashin <pasha.tatashin@soleen.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2018-12-28 12:11:47 -08:00
..
bpf	Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next	2018-12-20 17:31:36 -08:00
cgroup	cgroups: Replace synchronize_sched() with synchronize_rcu()	2018-12-01 12:38:49 -08:00
configs	kvm_config: add CONFIG_VIRTIO_MENU	2018-10-24 20:55:56 -04:00
debug	kdb: kdb_support: mark expected switch fall-throughs	2018-11-13 20:38:50 +00:00
dma	dma-direct: do not include SME mask in the DMA supported check	2018-12-17 18:02:11 +01:00
events	Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-12-26 14:45:18 -08:00
gcov	gcov: remove CONFIG_GCOV_FORMAT_AUTODETECT	2018-06-08 18:56:02 +09:00
irq	genirq/affinity: Add is_managed to struct irq_affinity_desc	2018-12-19 11:32:08 +01:00
livepatch	livepatch: Replace synchronize_sched() with synchronize_rcu()	2018-12-01 12:38:50 -08:00
locking	Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-12-26 14:25:52 -08:00
power	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-12-26 14:56:10 -08:00
printk	Printk changes for 4.21	2018-12-27 11:24:43 -08:00
rcu	rcutorture: Don't do busted forward-progress testing	2018-12-01 12:45:42 -08:00
sched	sched/fair: Fix warning on non-SMP build	2018-12-27 10:40:15 -08:00
time	Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-12-25 15:44:08 -08:00
trace	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2018-12-27 13:04:52 -08:00
.gitignore	…
Kconfig.freezer	…
Kconfig.hz	…
Kconfig.locks	…
Kconfig.preempt	kconfig: include kernel/Kconfig.preempt from init/Kconfig	2018-08-02 08:06:54 +09:00
Makefile	audit: remove WATCH and TREE config options	2018-11-19 16:29:50 -05:00
acct.c	…
async.c	…
audit.c	audit: remove duplicated include from audit.c	2018-12-14 12:09:30 -05:00
audit.h	audit: use current whenever possible	2018-11-26 18:41:21 -05:00
audit_fsnotify.c	audit: minimize our use of audit_log_format()	2018-11-26 18:40:00 -05:00
audit_tree.c	audit: minimize our use of audit_log_format()	2018-11-26 18:40:00 -05:00
audit_watch.c	audit: minimize our use of audit_log_format()	2018-11-26 18:40:00 -05:00
auditfilter.c	audit: rename FILTER_TYPE to FILTER_EXCLUDE	2018-06-19 10:39:54 -04:00
auditsc.c	audit: use current whenever possible	2018-11-26 18:41:21 -05:00
backtracetest.c	…
bounds.c	kbuild: fix kernel/bounds.c 'W=1' warning	2018-10-31 08:54:14 -07:00
capability.c	…
compat.c	y2038: globally rename compat_time to old_time32	2018-08-27 14:48:48 +02:00
configs.c	…
context_tracking.c	…
cpu.c	x86/speculation: Rework SMT state change	2018-11-28 11:57:07 +01:00
cpu_pm.c	…
crash_core.c	kernel/crash_core.c: print timestamp using time64_t	2018-08-22 10:52:47 -07:00
crash_dump.c	…
cred.c	…
delayacct.c	delayacct: track delays from thrashing cache pages	2018-10-26 16:26:32 -07:00
dma.c	…
elfcore.c	…
exec_domain.c	…
exit.c	signal: Pass pid type into group_send_sig_info	2018-07-21 12:57:35 -05:00
extable.c	…
fail_function.c	kernel/fail_function.c: remove meaningless null pointer check before debugfs_remove_recursive	2018-10-31 08:54:12 -07:00
fork.c	mm: reference totalram_pages and managed_pages once per function	2018-12-28 12:11:47 -08:00
freezer.c	PM / reboot: Eliminate race between reboot and suspend	2018-08-06 12:35:20 +02:00
futex.c	futex: Cure exit race	2018-12-18 23:13:15 +01:00
futex_compat.c	y2038: globally rename compat_time to old_time32	2018-08-27 14:48:48 +02:00
groups.c	…
hung_task.c	kernel: hung_task.c: disable on suspend	2018-10-25 18:45:08 +02:00
iomem.c	…
irq_work.c	…
jump_label.c	Merge branch 'x86/build' into locking/core, to pick up dependent patches and unify jump-label work	2018-10-16 17:30:11 +02:00
kallsyms.c	kallsyms: reduce size a little on 64-bit	2018-09-10 22:54:33 +09:00
kcmp.c	…
kcov.c	kernel/kcov.c: mark funcs in __sanitizer_cov_trace_pc() as notrace	2018-11-30 14:56:14 -08:00
kexec.c	kexec: add call to LSM hook in original kexec_load syscall	2018-07-16 12:31:57 -07:00
kexec_core.c	mm: reference totalram_pages and managed_pages once per function	2018-12-28 12:11:47 -08:00
kexec_file.c	kexec_file: kexec_walk_memblock() only walks a dedicated region at kdump	2018-12-06 14:38:50 +00:00
kexec_internal.h	…
kmod.c	…
kprobes.c	Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-12-26 14:45:18 -08:00
ksysfs.c	…
kthread.c	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-08-13 11:25:07 -07:00
latencytop.c	…
memremap.c	Merge branch 'xarray' of git://git.infradead.org/users/willy/linux-dax	2018-10-28 11:35:40 -07:00
module-internal.h	modsign: log module name in the event of an error	2018-07-02 11:36:17 +02:00
module.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2018-12-27 13:04:52 -08:00
module_signing.c	modsign: use all trusted keys to verify module signature	2018-11-07 14:41:41 +01:00
notifier.c	…
nsproxy.c	…
padata.c	padata: clean an indentation issue, remove extraneous space	2018-11-16 14:11:04 +08:00
panic.c	Printk changes for 4.21	2018-12-27 11:24:43 -08:00
params.c	…
pid.c	mm: remove include/linux/bootmem.h	2018-10-31 08:54:16 -07:00
pid_namespace.c	signal: Use group_send_sig_info to kill all processes in a pid namespace	2018-09-16 16:08:25 +02:00
profile.c	mm: remove include/linux/bootmem.h	2018-10-31 08:54:16 -07:00
ptrace.c	ptrace: Remove unused ptrace_may_access_sched() and MODE_IBRS	2018-11-28 11:57:11 +01:00
range.c	…
reboot.c	kernel/reboot.c: export pm_power_off_prepare	2018-09-11 16:13:24 +01:00
relay.c	kernel/relay.c: change return type to vm_fault_t	2018-06-15 07:55:24 +09:00
resource.c	resource/docs: Complete kernel-doc style function documentation	2018-11-07 16:47:47 +01:00
rseq.c	rseq: uapi: Declare rseq_cs field as union, update includes	2018-07-10 22:18:52 +02:00
seccomp.c	Merge branch 'next-general' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	2018-10-24 11:49:35 +01:00
signal.c	kernel/signal.c: fix a comment error	2018-10-31 08:54:14 -07:00
smp.c	smp,cpumask: introduce on_each_cpu_cond_mask	2018-10-09 16:51:11 +02:00
smpboot.c	smpboot: Remove cpumask from the API	2018-07-03 09:20:44 +02:00
smpboot.h	…
softirq.c	Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-10-25 11:43:47 -07:00
stackleak.c	stackleak: Mark stackleak_track_stack() as notrace	2018-12-05 19:31:44 -08:00
stacktrace.c	…
stop_machine.c	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-08-13 11:25:07 -07:00
sys.c	arm64: add prctl control for resetting ptrauth keys	2018-12-13 16:42:46 +00:00
sys_ni.c	Merge branch 'core-rseq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-06-10 10:17:09 -07:00
sysctl.c	kernel/sysctl.c: remove duplicated include	2018-11-03 10:09:37 -07:00
sysctl_binary.c	…
task_work.c	…
taskstats.c	…
test_kprobes.c	kprobes: Remove jprobe API implementation	2018-06-21 12:33:05 +02:00
torture.c	torture: Remove unnecessary "ret" variables	2018-12-01 12:45:35 -08:00
tracepoint.c	tracing: Replace synchronize_sched() and call_rcu_sched()	2018-11-27 09:21:41 -08:00
tsacct.c	…
ucount.c	…
uid16.c	…
uid16.h	…
umh.c	umh: Add command line to user mode helpers	2018-10-22 19:37:36 -07:00
up.c	smp,cpumask: introduce on_each_cpu_cond_mask	2018-10-09 16:51:11 +02:00
user-return-notifier.c	…
user.c	userns: use irqsave variant of refcount_dec_and_lock()	2018-08-22 10:52:47 -07:00
user_namespace.c	userns: also map extents in the reverse map to kernel IDs	2018-11-07 23:51:16 -06:00
utsname.c	…
utsname_sysctl.c	sys: don't hold uts_sem while accessing userspace memory	2018-08-11 02:05:53 -05:00
watchdog.c	watchdog: Mark watchdog touch functions as notrace	2018-08-30 12:56:40 +02:00
watchdog_hld.c	watchdog: Mark watchdog touch functions as notrace	2018-08-30 12:56:40 +02:00
workqueue.c	workqueue: Replace call_rcu_sched() with call_rcu()	2018-11-27 09:21:44 -08:00
workqueue_internal.h	…