David S. Miller bdcf81b658 sparc64: Fix lockdep warnings on reboot on Ultra-5 ... Inconsistently, the raw_* IRQ routines do not interact with and update the irqflags tracing and lockdep state, whereas the raw_* spinlock interfaces do. This causes problems in p1275_cmd_direct() because we disable hardirqs by hand using raw_local_irq_restore() and then do a raw_spin_lock() which triggers a lockdep trace because the CPU's hw IRQ state doesn't match IRQ tracing's internal software copy of that state. The CPU's irqs are disabled, yet current->hardirqs_enabled is true. ==================== reboot: Restarting system ------------[ cut here ]------------ WARNING: CPU: 0 PID: 1 at kernel/locking/lockdep.c:3536 check_flags+0x7c/0x240() DEBUG_LOCKS_WARN_ON(current->hardirqs_enabled) Modules linked in: openpromfs CPU: 0 PID: 1 Comm: systemd-shutdow Tainted: G W 3.17.0-dirty #145 Call Trace: [000000000045919c] warn_slowpath_common+0x5c/0xa0 [0000000000459210] warn_slowpath_fmt+0x30/0x40 [000000000048f41c] check_flags+0x7c/0x240 [0000000000493280] lock_acquire+0x20/0x1c0 [0000000000832b70] _raw_spin_lock+0x30/0x60 [000000000068f2fc] p1275_cmd_direct+0x1c/0x60 [000000000068ed28] prom_reboot+0x28/0x40 [000000000043610c] machine_restart+0x4c/0x80 [000000000047d2d4] kernel_restart+0x54/0x80 [000000000047d618] SyS_reboot+0x138/0x200 [00000000004060b4] linux_sparc_syscall32+0x34/0x60 ---[ end trace 5c439fe81c05a100 ]--- possible reason: unannotated irqs-off. irq event stamp: 2010267 hardirqs last enabled at (2010267): [<000000000049a358>] vprintk_emit+0x4b8/0x580 hardirqs last disabled at (2010266): [<0000000000499f08>] vprintk_emit+0x68/0x580 softirqs last enabled at (2010046): [<000000000045d278>] __do_softirq+0x378/0x4a0 softirqs last disabled at (2010039): [<000000000042bf08>] do_softirq_own_stack+0x28/0x40 Resetting ... ==================== Use local_* variables of the hw IRQ interfaces so that IRQ tracing sees all of our changes. Reported-by: Meelis Roos <mroos@linux.ee> Tested-by: Meelis Roos <mroos@linux.ee> Signed-off-by: David S. Miller <davem@davemloft.net>		2014-10-10 15:49:16 -04:00
..
bootstr_32.c	arch: sparc: prom: looping issue, need additional length check in the outside looping	2013-06-19 02:10:29 -07:00
bootstr_64.c	sparc64: Increase size of boot string to 1024 bytes	2014-10-07 15:41:02 -04:00
cif.S
console_32.c	Disintegrate asm/system.h for Sparc	2012-03-28 18:30:03 +01:00
console_64.c	Disintegrate asm/system.h for Sparc	2012-03-28 18:30:03 +01:00
init_32.c	sparc32: Remove superfluous extern declarations for prom_*() functions	2012-06-27 01:27:45 -07:00
init_64.c	sparc: Correct comments about prom_init() return values	2012-06-27 01:27:45 -07:00
Makefile	sparc32: drop sun4c support	2012-05-11 19:27:44 -07:00
memory.c
misc_32.c	Disintegrate asm/system.h for Sparc	2012-03-28 18:30:03 +01:00
misc_64.c	sparc64: fix sparse warnings in smp_64.c	2014-05-18 19:01:31 -07:00
mp.c	sparc: Remove unnecessary semicolons	2011-06-07 16:06:34 -07:00
p1275.c	sparc64: Fix lockdep warnings on reboot on Ultra-5	2014-10-10 15:49:16 -04:00
printf.c
ranges.c	Disintegrate asm/system.h for Sparc	2012-03-28 18:30:03 +01:00
tree_32.c	Merge branch 'next-devicetree' of git://git.secretlab.ca/git/linux-2.6	2011-01-10 08:57:03 -08:00
tree_64.c	sparc: remove inline marking of EXPORT_SYMBOL functions	2013-06-19 02:09:23 -07:00