Thomas Gleixner 84393817db x86/mtrr: Prevent CPU hotplug lock recursion ... Larry reported a CPU hotplug lock recursion in the MTRR code. ============================================ WARNING: possible recursive locking detected systemd-udevd/153 is trying to acquire lock: (cpu_hotplug_lock.rw_sem){.+.+.+}, at: [<c030fc26>] stop_machine+0x16/0x30 but task is already holding lock: (cpu_hotplug_lock.rw_sem){.+.+.+}, at: [<c0234353>] mtrr_add_page+0x83/0x470 .... cpus_read_lock+0x48/0x90 stop_machine+0x16/0x30 mtrr_add_page+0x18b/0x470 mtrr_add+0x3e/0x70 mtrr_add_page() holds the hotplug rwsem already and calls stop_machine() which acquires it again. Call stop_machine_cpuslocked() instead. Reported-and-tested-by: Larry Finger <Larry.Finger@lwfinger.net> Reported-by: Dmitry Vyukov <dvyukov@google.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1708140920250.1865@nanos Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Cc: Borislav Petkov <bp@suse.de>		2017-08-15 13:03:47 +02:00
..
amd.c
centaur.c
cleanup.c	x86/boot/e820: Prefix the E820_* type names with "E820_TYPE_"	2017-01-28 22:55:22 +01:00
cyrix.c
generic.c
if.c
main.c	x86/mtrr: Prevent CPU hotplug lock recursion	2017-08-15 13:03:47 +02:00
Makefile
mtrr.h