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Benjamin Herrenschmidt f4ac7b5eb7 [POWERPC] Fix device-tree locking vs. interrupts 
Lockdep found out that we can occasionally take the device-tree
lock for reading from softirq time (from rtas_token called
by the rtas real time clock code called by the NTP code),
while we take it occasionally for writing without masking
interrupts. The combination of those two can thus deadlock.

While some of those cases of interrupt read lock could be fixed
(such as caching the RTAS tokens) I figured that taking the
lock for writing is so rare (device-tree modification) that we
may as well penalize that case and allow reading from interrupts.

Thus, this turns all the writers to take the lock with irqs
masked to avoid the situation.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
2008-04-18 15:37:16 +10:00
..
vdso32 [POWERPC] vdso: Fixes for cache block sizes 2007-11-20 13:56:31 +11:00
vdso64 [POWERPC] vdso: Fixes for cache block sizes 2007-11-20 13:56:31 +11:00
align.c [POWERPC] Handle alignment faults on SPE load/store instructions 2007-09-14 08:51:48 -05:00
asm-offsets.c [POWERPC] iSeries: Use alternate paca structure for booting 2008-04-15 21:21:25 +10:00
audit.c [PATCH] audit signal recipients 2007-05-11 05:38:25 -04:00
btext.c [LIB]: Make PowerPC LMB code generic so sparc64 can use it too. 2008-02-13 16:56:49 -08:00
clock.c [POWERPC] clk.h interface for platforms 2007-10-03 09:11:56 +10:00
compat_audit.c [PATCH] add SIGNAL syscall class (v3) 2007-05-11 05:38:25 -04:00
cpu_setup_6xx.S Spelling fix: explicitly 2007-10-19 23:22:55 +02:00
cpu_setup_44x.S [POWERPC] 4xx: Add AMCC 460EX/460GT support to cputable.c & cpu_setup_44x.S 2008-03-26 07:19:16 -05:00
cpu_setup_pa6t.S
cpu_setup_ppc970.S
cputable.c [POWERPC] 4xx: Add AMCC 460EX/460GT support to cputable.c & cpu_setup_44x.S 2008-03-26 07:19:16 -05:00
crash.c [LIB]: Make PowerPC LMB code generic so sparc64 can use it too. 2008-02-13 16:56:49 -08:00
crash_dump.c [LIB]: Make PowerPC LMB code generic so sparc64 can use it too. 2008-02-13 16:56:49 -08:00
dma_64.c iommu sg: powerpc: convert iommu to use the IOMMU helper 2008-02-05 09:44:11 -08:00
entry_32.S [POWERPC] Make Book-E debug handling SMP safe 2008-04-17 01:01:40 -05:00
entry_64.S [POWERPC] Add 1TB workaround for PA6T 2007-10-17 22:30:09 +10:00
firmware.c
fpu.S
head_8xx.S [POWERPC] 8xx: fix swap 2008-03-07 08:42:28 -06:00
head_32.S [POWERPC] Remove dead code at KernelAltiVec 2008-02-26 22:17:03 +11:00
head_40x.S [POWERPC] Fix swapper_pg_dir size when CONFIG_PTE_64BIT=y on FSL_BOOKE 2007-12-06 13:11:04 -06:00
head_44x.S [POWERPC] Rework Book-E debug exception handling 2008-04-17 01:01:36 -05:00
head_64.S [POWERPC] Initialize paca->current earlier 2008-04-17 07:46:10 +10:00
head_booke.h [POWERPC] Rework Book-E debug exception handling 2008-04-17 01:01:36 -05:00
head_fsl_booke.S [POWERPC] Rework Book-E debug exception handling 2008-04-17 01:01:36 -05:00
ibmebus.c [POWERPC] Replace remaining __FUNCTION__ occurrences 2008-04-01 20:43:09 +11:00
idle.c [POWERPC] Fix sysctl table check failure on PowerMac 2007-11-08 14:15:30 +11:00
idle_6xx.S
idle_power4.S
init_task.c
io.c [POWERPC] Move inline asm eieio to using eieio inline function 2007-07-10 00:33:14 -05:00
iomap.c [POWERPC] Add 64-bit resources support to pci_iomap 2007-09-20 07:36:52 -05:00
iommu.c [POWERPC] Replace remaining __FUNCTION__ occurrences 2008-04-01 20:43:09 +11:00
irq.c [POWERPC] Fixup softirq preempt count 2008-04-17 07:46:11 +10:00
isa-bridge.c [POWERPC] Replace logical-AND by bit-AND in pci_process_ISA_OF_ranges() 2008-04-07 10:03:02 +10:00
kprobes.c [POWERPC] Kill sparse warnings in kprobes 2008-02-20 13:33:37 +11:00
l2cr_6xx.S Convert files to UTF-8 and some cleanups 2007-10-19 23:21:04 +02:00
legacy_serial.c [POWERPC] Fix legacy serial search for opb bus ports 2008-02-06 16:30:00 +11:00
lparcfg.c [POWERPC] Replace remaining __FUNCTION__ occurrences 2008-04-01 20:43:09 +11:00
machine_kexec.c [LIB]: Make PowerPC LMB code generic so sparc64 can use it too. 2008-02-13 16:56:49 -08:00
machine_kexec_32.c
machine_kexec_64.c
Makefile [POWERPC] Remove generated files on make clean 2008-02-14 22:11:02 +11:00
misc.S [POWERPC] Make setjmp/longjmp code usable outside of xmon 2008-01-25 22:52:50 +11:00
misc_32.S [POWERPC] Add __ucmpdi2 for 64-bit comparisons in 32-bit kernels 2008-03-13 09:39:55 +11:00
misc_64.S [POWERPC] kernel_execve is identical in 32 and 64 bit 2007-12-11 13:34:39 +11:00
module_32.c [POWERPC] Optimize counting distinct entries in the relocation sections 2007-12-21 15:05:58 +11:00
module_64.c [POWERPC] Optimize counting distinct entries in the relocation sections 2007-12-21 15:05:58 +11:00
msi.c
nvram_64.c [POWERPC] pseries: Eliminate global error_log_cnt variable 2007-08-17 11:01:52 +10:00
of_device.c [POWERPC] Use <linux/of_{platform, device}.h> and not <asm/...> variants. 2008-01-17 14:58:57 +11:00
of_platform.c [POWERPC] arch/powerpc/kernel: Use for_each_child_of_node 2008-01-17 14:57:20 +11:00
paca.c [POWERPC] Initialize paca->current earlier 2008-04-17 07:46:10 +10:00
pci-common.c [POWERPC] Fix bogus test for unassigned PCI resources 2008-03-13 10:09:27 +11:00
pci_32.c [POWERPC] Remove update_bridge_resource 2008-01-23 19:32:30 -06:00
pci_64.c [POWERPC] Always hookup PHB IO resource even when empty 2008-01-25 22:52:53 +11:00
pci_dn.c [POWERPC] iSeries: eliminate pci_dn bussubno 2008-01-17 14:57:05 +11:00
pmc.c [POWERPC] Made FSL Book-E PMC support more generic 2008-02-05 23:34:14 -06:00
ppc32.h
ppc_ksyms.c [POWERPC] Add hand-coded assembly strcmp 2008-04-07 10:03:03 +10:00
proc_ppc64.c
process.c Merge branch 'linux-2.6' 2008-04-14 21:11:02 +10:00
prom.c [POWERPC] Fix device-tree locking vs. interrupts 2008-04-18 15:37:16 +10:00
prom_init.c [POWERPC] Efika: Really, don't pretend to be CHRP 2008-04-17 07:46:12 +10:00
prom_parse.c [POWERPC] Add of_translate_dma_address 2007-12-11 15:43:35 +11:00
ptrace.c [POWERPC] user_regset PTRACE_SETREGS regression fix 2008-03-20 10:10:56 +11:00
ptrace32.c [POWERPC] Use regset code for compat PTRACE_*REGS* calls 2008-02-07 20:40:21 +11:00
rio.c [POWERPC] Move RapidIO support code from arch/ppc 2008-01-23 19:35:15 -06:00
rtas-proc.c [POWERPC] Fix ppc_rtas_progress_show() 2007-05-17 21:11:15 +10:00
rtas-rtc.c
rtas.c [POWERPC] Replace remaining __FUNCTION__ occurrences 2008-04-01 20:43:09 +11:00
rtas_flash.c Merge branch 'linux-2.6' 2008-04-14 21:11:02 +10:00
rtas_pci.c [POWERPC] Convert pci and eeh code to of_device_is_available 2008-04-07 13:49:25 +10:00
semaphore.c
setup-common.c [POWERPC] Add 'model: ...' line to common show_cpuinfo() 2008-03-26 08:44:04 +11:00
setup.h
setup_32.c [POWERPC] Clean up some linker and symbol usage 2008-04-17 07:46:13 +10:00
setup_64.c [POWERPC] Clean up some linker and symbol usage 2008-04-17 07:46:13 +10:00
signal.c [POWERPC] Implement logging of unhandled signals 2007-10-12 14:05:18 +10:00
signal.h [POWERPC] Less ifdef's in signal.c/signal.h 2007-06-14 22:29:58 +10:00
signal_32.c [POWERPC] arch/powerpc: Remove duplicate includes 2007-12-20 17:13:50 +11:00
signal_64.c [POWERPC] Implement logging of unhandled signals 2007-10-12 14:05:18 +10:00
smp-tbsync.c
smp.c [POWERPC] Make smp_send_stop() handle panic and xmon reboot 2008-01-25 22:52:50 +11:00
softemu8xx.c [POWERPC] 8xx: Move softemu8xx.c from arch/ppc 2007-10-04 11:02:54 -05:00
suspend.c
swsusp.c powerpc: fixup hard_irq_disable semantics 2007-05-11 08:29:34 -07:00
swsusp_32.S [POWERPC] Make altivec code in swsusp_32.S depend on CONFIG_ALTIVEC 2007-11-08 14:15:34 +11:00
swsusp_64.c
swsusp_asm64.S
sys_ppc32.c [POWERPC] Don't touch PT_DTRACE in exec 2008-03-26 08:44:05 +11:00
syscalls.c remove include/asm-*/ipc.h 2007-10-17 08:42:55 -07:00
sysfs.c remove __attribute_used__ 2008-01-28 23:21:18 +01:00
systbl.S [POWERPC] Align the sys_call_table 2007-10-11 14:36:47 +10:00
systbl_chk.c [POWERPC] Fix a couple of copyright symbols 2008-01-25 22:52:50 +11:00
systbl_chk.sh [POWERPC] Fix a couple of copyright symbols 2008-01-25 22:52:50 +11:00
tau_6xx.c
time.c taskstats scaled time cleanup 2008-02-06 10:41:00 -08:00
traps.c [POWERPC] Fix compilation for CONFIG_DEBUGGER=n and CONFIG_KEXEC=y 2008-02-07 11:40:18 +11:00
udbg.c [POWERPC] 4xx: Add early udbg support for 40x processors 2007-12-23 13:13:03 -06:00
udbg_16550.c [POWERPC] 4xx: Add early udbg support for 40x processors 2007-12-23 13:13:03 -06:00
vdso.c Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/lmb-2.6 2008-02-26 21:08:45 +11:00
vecemu.c
vector.S
vio.c [POWERPC] Replace remaining __FUNCTION__ occurrences 2008-04-01 20:43:09 +11:00
vmlinux.lds.S [POWERPC] Update linker script to properly set physical addresses 2008-04-17 07:46:14 +10:00