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linux/include/asm-generic
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Andrew Morton 795d45b22c x86: fix RTC lockdep warning: potential hardirq recursion 
After disabling both CONFIG_DEBUG_LOCKING_API_SELFTESTS and netconsole
(using current mainline) I get a login prompt, and also...

[    5.181668] SELinux: policy loaded with handle_unknown=deny
[    5.183315] type=1403 audit(1202100038.157:3): policy loaded auid=4294967295 ses=4294967295
[    5.822073] SELinux: initialized (dev usbfs, type usbfs), uses genfs_contexts
[    7.819146] ------------[ cut here ]------------
[    7.819146] WARNING: at kernel/lockdep.c:2033 trace_hardirqs_on+0x9b/0x10d()
[    7.819146] Modules linked in: generic ext3 jbd ide_disk ide_core
[    7.819146] Pid: 399, comm: hwclock Not tainted 2.6.24 #4
[    7.819146]  [<c011d140>] warn_on_slowpath+0x41/0x51
[    7.819146]  [<c01364a9>] ? lock_release_holdtime+0x50/0x56
[    7.819146]  [<c013770c>] ? check_usage_forwards+0x19/0x3b
[    7.819146]  [<c01390c4>] ? __lock_acquire+0xac3/0xb0b
[    7.819146]  [<c0108c98>] ? native_sched_clock+0x8b/0x9f
[    7.819146]  [<c01364a9>] ? lock_release_holdtime+0x50/0x56
[    7.819146]  [<c030ca6c>] ? _spin_unlock_irq+0x22/0x42
[    7.819146]  [<c013848b>] trace_hardirqs_on+0x9b/0x10d
[    7.819146]  [<c030ca6c>] _spin_unlock_irq+0x22/0x42
[    7.819146]  [<c011481e>] hpet_rtc_interrupt+0xdf/0x290
[    7.819146]  [<c014ea90>] handle_IRQ_event+0x1a/0x46
[    7.819146]  [<c014f8ea>] handle_edge_irq+0xbe/0xff
[    7.819146]  [<c0106e08>] do_IRQ+0x6d/0x84
[    7.819146]  [<c0105596>] common_interrupt+0x2e/0x34
[    7.819146]  [<c013007b>] ? ktime_get_ts+0x8/0x3f
[    7.819146]  [<c0139420>] ? lock_release+0x167/0x16f
[    7.819146]  [<c017974a>] ? core_sys_select+0x2c/0x327
[    7.819146]  [<c0179792>] core_sys_select+0x74/0x327
[    7.819146]  [<c0108c98>] ? native_sched_clock+0x8b/0x9f
[    7.819146]  [<c01364a9>] ? lock_release_holdtime+0x50/0x56
[    7.819146]  [<c030ca6c>] ? _spin_unlock_irq+0x22/0x42
[    7.819146]  [<c01384d6>] ? trace_hardirqs_on+0xe6/0x10d
[    7.819146]  [<c030ca77>] ? _spin_unlock_irq+0x2d/0x42
[    7.819146]  [<c023b437>] ? rtc_do_ioctl+0x11b/0x677
[    7.819146]  [<c01c487e>] ? inode_has_perm+0x5e/0x68
[    7.819146]  [<c01364a9>] ? lock_release_holdtime+0x50/0x56
[    7.819146]  [<c0108c98>] ? native_sched_clock+0x8b/0x9f
[    7.819146]  [<c01c490b>] ? file_has_perm+0x83/0x8c
[    7.819146]  [<c023ba08>] ? rtc_ioctl+0xf/0x11
[    7.819146]  [<c017898d>] ? do_ioctl+0x55/0x67
[    7.819146]  [<c0179d15>] sys_select+0x93/0x163
[    7.819146]  [<c0104b39>] ? sysenter_past_esp+0x9a/0xa5
[    7.819146]  [<c0104afe>] sysenter_past_esp+0x5f/0xa5
[    7.819146]  =======================
[    7.819146] ---[ end trace 96540ca301ffb84c ]---
[    7.819210] rtc: lost 6 interrupts
[    7.870668] type=1400 audit(1202128840.794:4): avc:  denied  { audit_write } for  pid=399 comm="hwclock" capability=29 scontext=system_u:system_r:hwclock_t:s0 tcontext=system_u:system_r:hwclock_t:s0 tclass=capability
[    9.538866] input: PC Speaker as /class/input/input5

Because hpet_rtc_interrupt()'s call to get_rtc_time() ends up
resolving to include/asm-generic/rtc.h's (hilariously inlined)
get_rtc_time(), which does spin_unlock_irq() from hard IRQ context.

The obvious patch fixes it.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-02-04 16:48:10 +01:00
..
bitops ext4: Add ext4_find_next_bit() 2008-01-28 23:58:27 -05:00
4level-fixup.h [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
atomic.h atomic.h: atomic_add_unless as inline. Remove system.h atomic.h circular dependency 2007-05-08 11:15:20 -07:00
audit_change_attr.h [PATCH] fix missing ifdefs in syscall classes hookup for generic targets 2006-09-22 17:48:56 -07:00
audit_dir_write.h [PATCH] fix missing ifdefs in syscall classes hookup for generic targets 2006-09-22 17:48:56 -07:00
audit_read.h [PATCH] audit: more syscall classes added 2006-09-11 13:32:27 -04:00
audit_signal.h [PATCH] add SIGNAL syscall class (v3) 2007-05-11 05:38:25 -04:00
audit_write.h [PATCH] audit: more syscall classes added 2006-09-11 13:32:27 -04:00
bitops.h forbid asm/bitops.h direct inclusion 2007-10-19 11:53:41 -07:00
bug.h debug: move WARN_ON() out of line 2008-01-30 13:32:50 +01:00
cputime.h [CPUFREQ] Remove slowdown from ondemand sampling path. 2006-06-30 01:29:47 -04:00
device.h Driver core: add dev_archdata to struct device 2006-12-01 14:52:01 -08:00
div64.h [NET]: div64_64 consolidate (rev3) 2007-04-25 22:23:33 -07:00
dma-mapping-broken.h dma-mapping: prevent dma dependent code from linking on !HAS_DMA archs 2007-07-16 09:05:45 -07:00
dma-mapping.h [PATCH] Pass struct dev pointer to dma_cache_sync() 2006-12-07 08:39:41 -08:00
emergency-restart.h
errno-base.h
errno.h
fcntl.h Introduce O_CLOEXEC 2007-07-16 09:05:45 -07:00
futex.h [PATCH] mm: pagefault_{disable,enable}() 2006-12-07 08:39:21 -08:00
gpio.h [PATCH] GPIO core 2007-02-12 09:48:34 -08:00
ide_iops.h
ioctl.h [PATCH] Generic ioctl.h 2006-01-10 08:01:34 -08:00
iomap.h
irq_regs.h IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
Kbuild remove include/asm-*/ipc.h 2007-10-17 08:42:55 -07:00
Kbuild.asm unexport asm/shmparam.h 2007-10-17 08:42:47 -07:00
kdebug.h move die notifier handling to common code 2007-05-08 11:15:04 -07:00
libata-portmap.h libata-portmap: Remove unused definitions 2007-10-12 14:55:37 -04:00
local.h local_t: architecture independent extension 2007-05-08 11:15:20 -07:00
memory_model.h Generic Virtual Memmap support for SPARSEMEM 2007-10-16 09:42:51 -07:00
mm_hooks.h [PATCH] x86: PARAVIRT: add hooks to intercept mm creation and destruction 2007-05-02 19:27:14 +02:00
mman.h [PATCH] Remove final references to deprecated "MAP_ANON" page protection flag 2007-02-11 10:51:17 -08:00
mutex-dec.h fix file specification in comments 2006-10-03 23:01:26 +02:00
mutex-null.h fix file specification in comments 2006-10-03 23:01:26 +02:00
mutex-xchg.h fix file specification in comments 2006-10-03 23:01:26 +02:00
page.h Revert "[PATCH] LOG2: Alter get_order() so that it can make use of ilog2() on a constant" 2007-03-06 19:38:01 -08:00
pci-dma-compat.h
pci.h
percpu.h x86/non-x86: percpu, node ids, apic ids x86.git fixup 2008-01-30 13:33:32 +01:00
pgtable-nopmd.h [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
pgtable-nopud.h [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
pgtable.h flush icache before set_pte() on ia64: flush icache at set_pte 2007-10-16 09:42:59 -07:00
poll.h Consolidate asm/poll.h 2007-05-11 08:29:34 -07:00
resource.h sched: SCHED_FIFO/SCHED_RR watchdog timer 2008-01-25 21:08:27 +01:00
rtc.h x86: fix RTC lockdep warning: potential hardirq recursion 2008-02-04 16:48:10 +01:00
sections.h [PATCH] add __[start|end]_rodata sections to asm-generic/sections.h 2006-07-01 09:56:03 -07:00
siginfo.h
signal.h Add standard include guard to asm-generic/signal and use compiler.h 2006-04-27 06:57:23 +01:00
statfs.h
termios.h Define termios_1 functions for powerpc, s390, avr32 and frv 2007-09-12 09:08:05 -07:00
tlb.h asm-generic/tlb.h: remove <linux/quicklist.h> 2008-02-04 16:48:00 +01:00
topology.h
uaccess.h
unaligned.h use __val in __get_unaligned 2007-07-31 15:39:42 -07:00
vmlinux.lds.h x86: add testcases for RODATA and NX protections/attributes 2008-01-30 13:34:08 +01:00
xor.h