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This is the 5.4.173 stable release

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Merge 5.4.173 into android11-5.4-lts

Changes in 5.4.173
	kbuild: Add $(KBUILD_HOSTLDFLAGS) to 'has_libelf' test
	devtmpfs regression fix: reconfigure on each mount
	orangefs: Fix the size of a memory allocation in orangefs_bufmap_alloc()
	vfs: fs_context: fix up param length parsing in legacy_parse_param
	perf: Protect perf_guest_cbs with RCU
	KVM: s390: Clarify SIGP orders versus STOP/RESTART
	media: uvcvideo: fix division by zero at stream start
	rtlwifi: rtl8192cu: Fix WARNING when calling local_irq_restore() with interrupts enabled
	firmware: qemu_fw_cfg: fix sysfs information leak
	firmware: qemu_fw_cfg: fix NULL-pointer deref on duplicate entries
	firmware: qemu_fw_cfg: fix kobject leak in probe error path
	KVM: x86: remove PMU FIXED_CTR3 from msrs_to_save_all
	ALSA: hda/realtek - Fix silent output on Gigabyte X570 Aorus Master after reboot from Windows
	mtd: fixup CFI on ixp4xx
	ARM: 9025/1: Kconfig: CPU_BIG_ENDIAN depends on !LD_IS_LLD
	Linux 5.4.173

Signed-off-by: Greg Kroah-Hartman <[email protected]>
Change-Id: I1127aba3d2970fc47a45fa127abed48255bd53b7
This commit is contained in:
Greg Kroah-Hartman 2022-01-20 09:36:50 +01:00
commit 5d5005448e
27 changed files with 190 additions and 61 deletions
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13
kernel/events/core.c
View file

@ -6061,18 +6061,25 @@ static void perf_pending_event(struct irq_work *entry)
* Later on, we might change it to a list if there is
* another virtualization implementation supporting the callbacks.
*/
struct perf_guest_info_callbacks *perf_guest_cbs;
struct perf_guest_info_callbacks __rcu *perf_guest_cbs;
int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *cbs)
{
perf_guest_cbs = cbs;
if (WARN_ON_ONCE(rcu_access_pointer(perf_guest_cbs)))
return -EBUSY;
rcu_assign_pointer(perf_guest_cbs, cbs);
return 0;
}
EXPORT_SYMBOL_GPL(perf_register_guest_info_callbacks);
int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *cbs)
{
perf_guest_cbs = NULL;
if (WARN_ON_ONCE(rcu_access_pointer(perf_guest_cbs) != cbs))
return -EINVAL;
rcu_assign_pointer(perf_guest_cbs, NULL);
synchronize_rcu();
return 0;
}
EXPORT_SYMBOL_GPL(perf_unregister_guest_info_callbacks);