Song Liu 7c7e3d31e7 bpf: Introduce helper bpf_find_vma ... In some profiler use cases, it is necessary to map an address to the backing file, e.g., a shared library. bpf_find_vma helper provides a flexible way to achieve this. bpf_find_vma maps an address of a task to the vma (vm_area_struct) for this address, and feed the vma to an callback BPF function. The callback function is necessary here, as we need to ensure mmap_sem is unlocked. It is necessary to lock mmap_sem for find_vma. To lock and unlock mmap_sem safely when irqs are disable, we use the same mechanism as stackmap with build_id. Specifically, when irqs are disabled, the unlocked is postponed in an irq_work. Refactor stackmap.c so that the irq_work is shared among bpf_find_vma and stackmap helpers. Signed-off-by: Song Liu <songliubraving@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Tested-by: Hengqi Chen <hengqi.chen@gmail.com> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20211105232330.1936330-2-songliubraving@fb.com		2021-11-07 11:54:51 -08:00
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bpf	bpf: Introduce helper bpf_find_vma	2021-11-07 11:54:51 -08:00
cgroup	cgroup: Fix memory leak caused by missing cgroup_bpf_offline	2021-10-22 17:23:54 -07:00
configs
debug
dma	arm64 updates for 5.16	2021-11-01 16:33:53 -07:00
entry
events	Core:	2021-11-02 06:20:58 -07:00
futex
gcov
irq	irqchip updates for Linux 5.16	2021-10-29 11:58:35 +02:00
kcsan
livepatch	Tracing updates for 5.16:	2021-11-01 20:05:19 -07:00
locking	RCU pull request for v5.16	2021-11-01 20:25:38 -07:00
power
printk
rcu	RCU pull request for v5.16	2021-11-01 20:25:38 -07:00
sched	cpu-to-thread_info update for v5.16-rc1	2021-11-01 17:00:05 -07:00
time
trace	bpf: Introduce helper bpf_find_vma	2021-11-07 11:54:51 -08:00
.gitignore
acct.c
async.c
audit.c
audit.h	audit/stable-5.16 PR 20211101	2021-11-01 21:17:39 -07:00
audit_fsnotify.c
audit_tree.c	audit/stable-5.16 PR 20211101	2021-11-01 21:17:39 -07:00
audit_watch.c
auditfilter.c
auditsc.c	audit/stable-5.16 PR 20211101	2021-11-01 21:17:39 -07:00
backtracetest.c
bounds.c
capability.c
cfi.c
compat.c
configs.c
context_tracking.c
cpu.c
cpu_pm.c
crash_core.c
crash_dump.c
cred.c
delayacct.c
dma.c
exec_domain.c
exit.c	Scheduler updates:	2021-11-01 13:48:52 -07:00
extable.c
fail_function.c
fork.c	Scheduler updates:	2021-11-01 13:48:52 -07:00
freezer.c
gen_kheaders.sh
groups.c
hung_task.c
iomem.c
irq_work.c
jump_label.c
kallsyms.c
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kcov.c
kexec.c
kexec_core.c
kexec_elf.c
kexec_file.c
kexec_internal.h
kheaders.c
kmod.c
kprobes.c	Tracing updates for 5.16:	2021-11-01 20:05:19 -07:00
ksysfs.c
kthread.c
latencytop.c
Makefile	Tracing updates for 5.16:	2021-11-01 20:05:19 -07:00
module-internal.h
module.c
module_signature.c
module_signing.c
notifier.c
nsproxy.c
padata.c
panic.c
params.c
pid.c
pid_namespace.c
profile.c
ptrace.c
range.c
reboot.c
regset.c
relay.c
resource.c
resource_kunit.c
rseq.c
scftorture.c
scs.c
seccomp.c
signal.c	x86/fpu updates:	2021-11-01 14:03:56 -07:00
smp.c	sched: Improve wake_up_all_idle_cpus() take #2	2021-10-22 15:32:46 +02:00
smpboot.c
smpboot.h
softirq.c
stackleak.c
stacktrace.c
static_call.c
stop_machine.c
sys.c
sys_ni.c
sysctl-test.c
sysctl.c
task_work.c
taskstats.c
torture.c
tracepoint.c
tsacct.c
ucount.c
uid16.c
uid16.h
umh.c
up.c
user-return-notifier.c
user.c
user_namespace.c
usermode_driver.c
utsname.c
utsname_sysctl.c
watch_queue.c
watchdog.c
watchdog_hld.c
workqueue.c
workqueue_internal.h