Repository files (latest commit first)

Filename	Latest commit message	Latest commit date
Mel Gorman 077fa7aed1 futex: Calculate the futex key based on a tail page for file-based futexes ... Mike Galbraith reported that the LTP test case futex_wake04 was broken by commit 65d8fc777f ("futex: Remove requirement for lock_page() in get_futex_key()"). This test case uses futexes backed by hugetlbfs pages and so there is an associated inode with a futex stored on such pages. The problem is that the key is being calculated based on the head page index of the hugetlbfs page and not the tail page. Prior to the optimisation, the page lock was used to stabilise mappings and pin the inode is file-backed which is overkill. If the page was a compound page, the head page was automatically looked up as part of the page lock operation but the tail page index was used to calculate the futex key. After the optimisation, the compound head is looked up early and the page lock is only relied upon to identify truncated pages, special pages or a shmem page moving to swapcache. The head page is looked up because without the page lock, special care has to be taken to pin the inode correctly. However, the tail page is still required to calculate the futex key so this patch records the tail page. On vanilla 4.6, the output of the test case is; futex_wake04 0 TINFO : Hugepagesize 2097152 futex_wake04 1 TFAIL : futex_wake04.c:126: Bug: wait_thread2 did not wake after 30 secs. With the patch applied futex_wake04 0 TINFO : Hugepagesize 2097152 futex_wake04 1 TPASS : Hi hydra, thread2 awake! Fixes: 65d8fc777f "futex: Remove requirement for lock_page() in get_futex_key()" Reported-and-tested-by: Mike Galbraith <umgwanakikbuti@gmail.com> Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Davidlohr Bueso <dave@stgolabs.net> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/20160608132522.GM2469@suse.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>		2016-06-08 19:23:54 +02:00
..
bpf	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2016-05-31 22:28:28 -07:00
configs
debug	mm/init: Add 'rodata=off' boot cmdline parameter to disable read-only kernel mappings	2016-02-22 08:51:37 +01:00
events	Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-05-25 17:05:40 -07:00
gcov	gcov: disable for COMPILE_TEST	2016-05-10 17:12:49 +02:00
irq	radix-tree: introduce radix_tree_empty	2016-05-20 17:58:30 -07:00
livepatch	Merge branches 'for-4.7/core', 'for-4.7/livepatching-doc' and 'for-4.7/livepatching-ppc64' into for-linus	2016-05-17 12:06:35 +02:00
locking	locking/qspinlock: Fix spin_unlock_wait() some more	2016-06-08 14:29:08 +02:00
power	PM / Hibernate: Call flush_icache_range() on pages restored in-place	2016-04-28 13:35:48 +01:00
printk	printk/nmi: flush NMI messages on the system panic	2016-05-20 17:58:30 -07:00
rcu	debugobjects: insulate non-fixup logic related to static obj from fixup callbacks	2016-05-19 19:12:14 -07:00
sched	Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-05-25 17:11:43 -07:00
time	timer: Export destroy_hrtimer_on_stack()	2016-05-31 11:44:08 -07:00
trace	Three more changes.	2016-05-22 19:40:39 -07:00
.gitignore	certs: add .gitignore to stop git nagging about x509_certificate_list	2015-10-21 15:18:35 +01:00
acct.c
async.c	async: export current_is_async()	2015-11-19 17:51:48 +01:00
audit.c	Merge branch 'stable-4.7' of git://git.infradead.org/users/pcmoore/audit	2016-05-18 18:46:55 -07:00
audit.h	security: Make inode argument of inode_getsecid non-const	2015-12-24 11:09:39 -05:00
audit_fsnotify.c	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
audit_tree.c	audit: cleanup prune_tree_thread	2016-04-04 09:46:47 -04:00
audit_watch.c	don't bother with ->d_inode->i_sb - it's always equal to ->d_sb	2016-04-10 17:11:51 -04:00
auditfilter.c	audit: Fix typo in comment	2016-02-08 11:25:39 -05:00
auditsc.c	Merge branch 'stable-4.7' of git://git.infradead.org/users/pcmoore/audit	2016-05-18 18:46:55 -07:00
backtracetest.c
bounds.c
capability.c
cgroup.c	cgroup: fix compile warning	2016-05-12 11:05:27 -04:00
cgroup_freezer.c	cgroup: kill cgrp_ss_priv[CGROUP_CANFORK_COUNT] and friends	2015-12-03 10:24:08 -05:00
cgroup_pids.c	cgroup_pids: fix a typo.	2015-12-14 14:54:37 -05:00
compat.c
configs.c
context_tracking.c	context_tracking: Switch to new static_branch API	2015-11-24 09:56:43 +01:00
cpu.c	sched/hotplug: Make activate() the last hotplug step	2016-05-06 14:58:25 +02:00
cpu_pm.c	kernel/cpu_pm: fix cpu_cluster_pm_exit comment	2015-09-03 02:42:20 +02:00
cpuset.c	cpuset: use static key better and convert to new API	2016-05-19 19:12:14 -07:00
crash_dump.c
cred.c	kmemcg: account certain kmem allocations to memcg	2016-01-14 16:00:49 -08:00
delayacct.c	kmemcg: account certain kmem allocations to memcg	2016-01-14 16:00:49 -08:00
dma.c
elfcore.c
exec_domain.c
exit.c	wait: allow sys_waitid() to accept __WNOTHREAD/__WCLONE/__WALL	2016-05-23 17:04:14 -07:00
extable.c	kernel/extable.c: remove duplicated include	2015-09-10 13:29:01 -07:00
fork.c	mm: oom_reaper: remove some bloat	2016-05-26 15:35:44 -07:00
freezer.c
futex.c	futex: Calculate the futex key based on a tail page for file-based futexes	2016-06-08 19:23:54 +02:00
futex_compat.c	ptrace: use fsuid, fsgid, effective creds for fs access checks	2016-01-20 17:09:18 -08:00
groups.c
hung_task.c	kernel/hung_task.c: use timeout diff when timeout is updated	2016-03-22 15:36:02 -07:00
irq_work.c	treewide: Remove old email address	2015-11-23 09:44:58 +01:00
jump_label.c	treewide: Remove old email address	2015-11-23 09:44:58 +01:00
kallsyms.c	kallsyms: add support for relative offsets in kallsyms address table	2016-03-15 16:55:16 -07:00
kcmp.c	ptrace: use fsuid, fsgid, effective creds for fs access checks	2016-01-20 17:09:18 -08:00
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kcov.c	kcov: don't profile branches in kcov	2016-04-28 19:34:04 -07:00
kexec.c	s390/kexec: consolidate crash_map/unmap_reserved_pages() and arch_kexec_protect(unprotect)_crashkres()	2016-05-23 17:04:14 -07:00
kexec_core.c	s390/kexec: consolidate crash_map/unmap_reserved_pages() and arch_kexec_protect(unprotect)_crashkres()	2016-05-23 17:04:14 -07:00
kexec_file.c	kexec: introduce a protection mechanism for the crashkernel reserved memory	2016-05-23 17:04:14 -07:00
kexec_internal.h	kexec: move some memembers and definitions within the scope of CONFIG_KEXEC_FILE	2016-01-20 17:09:18 -08:00
kmod.c	kmod: don't run async usermode helper as a child of kworker thread	2015-10-23 17:55:10 +09:00
kprobes.c
ksysfs.c	rcu: Remove TINY_RCU bloat from pointless boot parameters	2015-12-07 16:59:37 -08:00
kthread.c	kernel/kthread.c:kthread_create_on_node(): clarify documentation	2015-09-04 16:54:41 -07:00
latencytop.c	sched/debug: Make schedstats a runtime tunable that is disabled by default	2016-02-09 11:54:23 +01:00
Makefile	ELF/MIPS build fix	2016-05-23 17:04:14 -07:00
membarrier.c	sys_membarrier(): system-wide memory barrier (generic, x86)	2015-09-11 15:21:34 -07:00
memremap.c	memremap: add arch specific hook for MEMREMAP_WB mappings	2016-04-04 10:26:41 +02:00
module-internal.h
module.c	module: preserve Elf information for livepatch modules	2016-04-01 15:00:10 +02:00
module_signing.c	KEYS: Move the point of trust determination to __key_link()	2016-04-11 22:43:43 +01:00
notifier.c	Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-09-01 08:40:25 -07:00
nsproxy.c	cgroup: introduce cgroup namespaces	2016-02-16 13:04:58 -05:00
padata.c	kernel/padata.c: hide unused functions	2016-05-19 19:12:14 -07:00
panic.c	printk/nmi: flush NMI messages on the system panic	2016-05-20 17:58:30 -07:00
params.c	Nothing exciting, minor tweaks and cleanups.	2015-11-09 15:53:39 -08:00
pid.c	remove lots of IS_ERR_VALUE abuses	2016-05-27 15:26:11 -07:00
pid_namespace.c
profile.c	profile: hide unused functions when !CONFIG_PROC_FS	2016-03-22 15:36:02 -07:00
ptrace.c	ptrace: change __ptrace_unlink() to clear ->ptrace under ->siglock	2016-03-22 15:36:02 -07:00
range.c
reboot.c	kexec: split kexec_load syscall from kexec core code	2015-09-10 13:29:01 -07:00
relay.c	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
resource.c	/proc/iomem: only expose physical resource addresses to privileged users	2016-04-14 12:56:09 -07:00
seccomp.c	Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus	2016-05-19 10:02:26 -07:00
signal.c	kernel/signal.c: convert printk(KERN_<LEVEL> ...) to pr_<level>(...)	2016-05-23 17:04:14 -07:00
smp.c	Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-03-15 13:50:29 -07:00
smpboot.c	cpu/hotplug: Unpark smpboot threads from the state machine	2016-03-01 20:36:56 +01:00
smpboot.h	cpu/hotplug: Create hotplug threads	2016-03-01 20:36:56 +01:00
softirq.c	arch, ftrace: for KASAN put hard/soft IRQ entries into separate sections	2016-03-25 16:37:42 -07:00
stacktrace.c
stop_machine.c	kernel/stop_machine.c: remove CONFIG_SMP dependencies	2016-01-16 11:17:24 -08:00
sys.c	prctl: make PR_SET_THP_DISABLE wait for mmap_sem killable	2016-05-23 17:04:14 -07:00
sys_ni.c	vfs: add copy_file_range syscall and vfs helper	2015-12-01 14:00:53 -05:00
sysctl.c	Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-05-25 17:05:40 -07:00
sysctl_binary.c	kernel/sysctl_binary.c: use generic UUID library	2016-05-20 17:58:30 -07:00
task_work.c	task_work: remove fifo ordering guarantee	2015-09-05 13:46:58 -07:00
taskstats.c	taskstats: use the libnl API to align nlattr on 64-bit	2016-04-23 20:13:25 -04:00
test_kprobes.c
torture.c	rcutorture: Dump trace buffer upon shutdown	2016-04-21 13:47:04 -07:00
tracepoint.c	kernel/...: convert pr_warning to pr_warn	2016-03-22 15:36:02 -07:00
tsacct.c	time, acct: Drop irq save & restore from __acct_update_integrals()	2016-02-29 09:53:09 +01:00
uid16.c
up.c
user-return-notifier.c
user.c
user_namespace.c	kernel/*: switch to memdup_user_nul()	2016-01-04 10:27:55 -05:00
utsname.c
utsname_sysctl.c
watchdog.c	watchdog: don't run proc_watchdog_update if new value is same as old	2016-03-17 15:09:34 -07:00
workqueue.c	debugobjects: insulate non-fixup logic related to static obj from fixup callbacks	2016-05-19 19:12:14 -07:00
workqueue_internal.h	sched/core: Get rid of 'cpu' argument in wq_worker_sleeping()	2016-03-02 10:28:47 -05:00