Paul E. McKenney 3d3eeb2ef2 sparc64: Eliminate obsolete __handle_softirq() function ...

The invocation of softirq is now handled by irq_exit(), so there is no
need for sparc64 to invoke it on the trap-return path.  In fact, doing so
is a bug because if the trap occurred in the idle loop, this invocation
can result in lockdep-RCU failures.  The problem is that RCU ignores idle
CPUs, and the sparc64 trap-return path to the softirq handlers fails to
tell RCU that the CPU must be considered non-idle while those handlers
are executing.  This means that RCU is ignoring any RCU read-side critical
sections in those handlers, which in turn means that RCU-protected data
can be yanked out from under those read-side critical sections.

The shiny new lockdep-RCU ability to detect RCU read-side critical sections
that RCU is ignoring located this problem.

The fix is straightforward: Make sparc64 stop manually invoking the
softirq handlers.

Reported-by: Meelis Roos <mroos@linux.ee>
Suggested-by: David Miller <davem@davemloft.net>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Tested-by: Meelis Roos <mroos@linux.ee>
Cc: stable@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>

2012-04-13 11:58:38 -07:00

..

.gitignore

sparc: gitignore a few files

2008-12-04 09:17:15 -08:00

apc.c

sparc: Add module.h to files previously implicitly using it.

2011-10-31 19:30:54 -04:00

asm-offsets.c

sparc,sparc64: unify asm-offsets.c

2008-12-04 09:17:12 -08:00

audit.c

sparc,sparc64: unify kernel/

2008-12-04 09:17:21 -08:00

auxio_32.c

Disintegrate asm/system.h for Sparc

2012-03-28 18:30:03 +01:00

auxio_64.c

sparc64: Fix section mis-match errors.

2011-03-30 17:37:56 -07:00

btext.c

sparc: remove several unnecessary module.h include instances

2011-10-31 19:30:54 -04:00

central.c

sparc: add export.h to arch/sparc files as required

2011-10-31 19:30:52 -04:00

cherrs.S

sparc,sparc64: unify kernel/

2008-12-04 09:17:21 -08:00

chmc.c

sparc: Remove unnecessary semicolons

2011-06-07 16:06:34 -07:00

compat_audit.c

sparc,sparc64: unify kernel/

2008-12-04 09:17:21 -08:00

cpu.c

sparc: move symbol exporters to use export.h not module.h

2011-10-31 19:30:53 -04:00

cpumap.c

sparc: move symbol exporters to use export.h not module.h

2011-10-31 19:30:53 -04:00

cpumap.h

sparc64: fix and optimize irq distribution

2009-06-16 04:56:28 -07:00

devices.c

Disintegrate asm/system.h for Sparc

2012-03-28 18:30:03 +01:00

dma.c

sparc: remove several unnecessary module.h include instances

2011-10-31 19:30:54 -04:00

ds.c

sparc64: Fix bootup crash on sun4v.

2012-04-13 11:56:22 -07:00

dtlb_miss.S

sparc,sparc64: unify kernel/

2008-12-04 09:17:21 -08:00

dtlb_prot.S

sparc,sparc64: unify kernel/

2008-12-04 09:17:21 -08:00

ebus.c

sparc: move symbol exporters to use export.h not module.h

2011-10-31 19:30:53 -04:00

entry.h

sparc64: Patch sun4v code sequences properly on module load.

2011-11-17 22:44:58 -08:00

entry.S

sparc: sun4m SMP: fix wrong shift instruction in IPI handler

2011-07-16 10:45:12 -07:00

etrap_32.S

sparc: prepare kernel/ for unification

2008-12-04 09:17:20 -08:00

etrap_64.S

sparc,sparc64: unify kernel/

2008-12-04 09:17:21 -08:00

fpu_traps.S

sparc,sparc64: unify kernel/

2008-12-04 09:17:21 -08:00

ftrace.c

sparc64: Add function graph tracer support.

2010-04-12 22:37:26 -07:00

getsetcc.S

sparc,sparc64: unify kernel/

2008-12-04 09:17:21 -08:00

head_32.S

sparc32,leon: operate on boot-cpu IRQ controller registers

2011-04-21 16:44:45 -07:00

head_64.S

sparc64: Future proof Niagara cpu detection.

2011-09-16 14:21:33 -07:00

helpers.S

sparc64: Fix perf_arch_get_caller_regs().

2010-08-08 22:07:36 -07:00

hvapi.c

sparc: move symbol exporters to use export.h not module.h

2011-10-31 19:30:53 -04:00

hvcalls.S

sparc: Set reboot-cmd using reboot data hypervisor call if available.

2011-08-02 21:28:52 -07:00

hvtramp.S

sparc,sparc64: unify kernel/

2008-12-04 09:17:21 -08:00

idprom.c

sparc: move symbol exporters to use export.h not module.h

2011-10-31 19:30:53 -04:00

init_task.c

Fix common misspellings

2011-03-31 11:26:23 -03:00

iommu_common.h

sparc,sparc64: unify kernel/

2008-12-04 09:17:21 -08:00

iommu.c

SPARC: adapt for dma_map_ops changes

2012-03-28 16:36:34 +02:00

ioport.c

SPARC: adapt for dma_map_ops changes

2012-03-28 16:36:34 +02:00

irq_32.c

sparc: add export.h to arch/sparc files as required

2011-10-31 19:30:52 -04:00

irq_64.c

Disintegrate asm/system.h for Sparc

2012-03-28 18:30:03 +01:00

irq.h

Disintegrate asm/system.h for Sparc

2012-03-28 18:30:03 +01:00

itlb_miss.S

sparc,sparc64: unify kernel/

2008-12-04 09:17:21 -08:00

ivec.S

sparc,sparc64: unify kernel/

2008-12-04 09:17:21 -08:00

jump_label.c

sparc: Fix even more fallout from system.h split.

2012-03-29 22:40:52 -07:00

kernel.h

sparc: Set reboot-cmd using reboot data hypervisor call if available.

2011-08-02 21:28:52 -07:00

kgdb_32.c

Disintegrate asm/system.h for Sparc

2012-03-28 18:30:03 +01:00

kgdb_64.c

sparc: Fix even more fallout from system.h split.

2012-03-29 22:40:52 -07:00

kprobes.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

kstack.h

sparc64: Run NMIs on the hardirq stack.

2010-04-14 02:04:29 -07:00

ktlb.S

sparc: Access kernel TSB using physical addressing when possible.

2011-08-05 00:53:57 -07:00

ldc.c

sparc: move symbol exporters to use export.h not module.h

2011-10-31 19:30:53 -04:00

led.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

leon_kernel.c

remove references to cpu_*_map in arch/

2012-03-29 15:38:30 +10:30

leon_pci_grpci2.c

sparc: move symbol exporters to use export.h not module.h

2011-10-31 19:30:53 -04:00

leon_pci.c

sparc32,leon: fix leon build

2012-04-04 15:44:39 -07:00

leon_pmc.c

SPARC/LEON: power down instruction different of different LEONs

2011-03-16 18:19:04 -07:00

leon_smp.c

atomic: use <linux/atomic.h>

2011-07-26 16:49:47 -07:00

Makefile

sparc: Allow handling signals when stack is corrupted.

2011-08-20 17:14:54 -07:00

mdesc.c

sparc: add export.h to arch/sparc files as required

2011-10-31 19:30:52 -04:00

misctrap.S

sparc,sparc64: unify kernel/

2008-12-04 09:17:21 -08:00

module.c

Disintegrate asm/system.h for Sparc

2012-03-28 18:30:03 +01:00

muldiv.c

Disintegrate asm/system.h for Sparc

2012-03-28 18:30:03 +01:00

nmi.c

Disintegrate asm/system.h for Sparc

2012-03-28 18:30:03 +01:00

of_device_32.c

sparc: remove several unnecessary module.h include instances

2011-10-31 19:30:54 -04:00

of_device_64.c

sparc: move symbol exporters to use export.h not module.h

2011-10-31 19:30:53 -04:00

of_device_common.c

sparc: move symbol exporters to use export.h not module.h

2011-10-31 19:30:53 -04:00

of_device_common.h

sparc: move of_device common code to of_device_common

2009-06-16 04:56:49 -07:00

pci_common.c

sparc: Remove unnecessary semicolons

2011-06-07 16:06:34 -07:00

pci_fire.c

sparc: add export.h to arch/sparc files as required

2011-10-31 19:30:52 -04:00

pci_impl.h

sparc64: rename virt_irq => irq - II

2011-03-16 18:19:03 -07:00

pci_msi.c

sparc: convert old cpumask API into new one

2011-05-16 13:38:07 -07:00

pci_psycho.c

sparc: add export.h to arch/sparc files as required

2011-10-31 19:30:52 -04:00

pci_sabre.c

sparc: add export.h to arch/sparc files as required

2011-10-31 19:30:52 -04:00

pci_schizo.c

sparc: add export.h to arch/sparc files as required

2011-10-31 19:30:52 -04:00

pci_sun4v_asm.S

sparc,sparc64: unify kernel/

2008-12-04 09:17:21 -08:00

pci_sun4v.c

SPARC: adapt for dma_map_ops changes

2012-03-28 16:36:34 +02:00

pci_sun4v.h

sparc,sparc64: unify kernel/

2008-12-04 09:17:21 -08:00

pci.c

sparc/PCI: convert devtree and arch-probed bus addresses to resource

2012-03-20 10:42:01 -07:00

pcic.c

sparc: add export.h to arch/sparc files as required

2011-10-31 19:30:52 -04:00

pcr.c

Disintegrate asm/system.h for Sparc

2012-03-28 18:30:03 +01:00

perf_event.c

Disintegrate asm/system.h for Sparc

2012-03-28 18:30:03 +01:00

pmc.c

sparc: Add module.h to files previously implicitly using it.

2011-10-31 19:30:54 -04:00

power.c

sparc: move symbol exporters to use export.h not module.h

2011-10-31 19:30:53 -04:00

process_32.c

Disintegrate asm/system.h for Sparc

2012-03-28 18:30:03 +01:00

process_64.c

Disintegrate asm/system.h for Sparc

2012-03-28 18:30:03 +01:00

prom_32.c

sparc: remove several unnecessary module.h include instances

2011-10-31 19:30:54 -04:00

prom_64.c

sparc: remove several unnecessary module.h include instances

2011-10-31 19:30:54 -04:00

prom_common.c

sparc: Use kmemdup rather than duplicating its implementation

2011-12-04 10:46:56 -08:00

prom_irqtrans.c

sparc: Remove unnecessary semicolons

2011-06-07 16:06:34 -07:00

prom.h

of/promtree: make drivers/of/pdt.c no longer sparc-only

2010-10-10 21:53:30 -06:00

psycho_common.c

sparc: Remove unnecessary semicolons

2011-06-07 16:06:34 -07:00

psycho_common.h

sparc: remove references to of_device and to_of_device

2010-07-24 09:58:22 -06:00

ptrace_32.c

Disintegrate asm/system.h for Sparc

2012-03-28 18:30:03 +01:00

ptrace_64.c

Disintegrate asm/system.h for Sparc

2012-03-28 18:30:03 +01:00

reboot.c

Disintegrate asm/system.h for Sparc

2012-03-28 18:30:03 +01:00

rtrap_32.S

sparc: keep calling do_signal() as long as pending signals remain

2010-10-26 08:59:55 -07:00

rtrap_64.S

sparc64: Eliminate obsolete __handle_softirq() function

2012-04-13 11:58:38 -07:00

sbus.c

sparc: add export.h to arch/sparc files as required

2011-10-31 19:30:52 -04:00

setup_32.c

Disintegrate asm/system.h for Sparc

2012-03-28 18:30:03 +01:00

setup_64.c

Disintegrate asm/system.h for Sparc

2012-03-28 18:30:03 +01:00

signal32.c

Disintegrate asm/system.h for Sparc

2012-03-28 18:30:03 +01:00

signal_32.c

Disintegrate asm/system.h for Sparc

2012-03-28 18:30:03 +01:00

signal_64.c

Disintegrate asm/system.h for Sparc

2012-03-28 18:30:03 +01:00

sigutil_32.c

Disintegrate asm/system.h for Sparc

2012-03-28 18:30:03 +01:00

sigutil_64.c

Disintegrate asm/system.h for Sparc

2012-03-28 18:30:03 +01:00

sigutil.h

sparc: Allow handling signals when stack is corrupted.

2011-08-20 17:14:54 -07:00

smp_32.c

atomic: use <linux/atomic.h>

2011-07-26 16:49:47 -07:00

smp_64.c

treewide: Fix typos in various parts of the kernel, and fix some comments.

2011-12-02 14:57:31 +01:00

sparc_ksyms_32.c

sparc: Eliminate PROMLIB_INTERNAL as it does nothing

2009-01-08 16:59:01 -08:00

sparc_ksyms_64.c

Disintegrate asm/system.h for Sparc

2012-03-28 18:30:03 +01:00

spiterrs.S

sparc,sparc64: unify kernel/

2008-12-04 09:17:21 -08:00

sstate.c

sparc: Set reboot-cmd using reboot data hypervisor call if available.

2011-08-02 21:28:52 -07:00

stacktrace.c

sparc: move symbol exporters to use export.h not module.h

2011-10-31 19:30:53 -04:00

starfire.c

sparc: explicitly cast negative phandle checks to s32

2011-01-03 20:02:06 -07:00

sun4c_irq.c

sparc32: genirq support

2011-04-19 22:11:40 -07:00

sun4d_irq.c

Add support for allocating irqs for bootbus devices

2011-06-07 16:06:33 -07:00

sun4d_smp.c

sparc32: fix fallout from system.h removal

2012-03-30 18:16:58 -07:00

sun4m_irq.c

sparc32: forced setting of mode of sun4m per-cpu timers

2012-01-10 16:28:24 -08:00

sun4m_smp.c

sparc32: fix fallout from system.h removal

2012-03-30 18:16:58 -07:00

sun4v_ivec.S

sparc,sparc64: unify kernel/

2008-12-04 09:17:21 -08:00

sun4v_tlb_miss.S

sparc,sparc64: unify kernel/

2008-12-04 09:17:21 -08:00

sys32.S

All Arch: remove linkage for sys_nfsservctl system call

2011-08-26 15:09:58 -07:00

sys_sparc32.c

sparc: remove several unnecessary module.h include instances

2011-10-31 19:30:54 -04:00

sys_sparc_32.c

BKL: remove extraneous #include <smp_lock.h>

2010-11-17 08:59:32 -08:00

sys_sparc_64.c

powerpc+sparc64/mm: Remove hack in mmap randomize layout

2011-11-28 11:42:09 +11:00

syscalls.S

sparc64: Kill off old sys_perfctr system call and state.

2010-03-03 08:08:49 -08:00

sysfs.c

cpu: convert 'cpu' and 'machinecheck' sysdev_class to a regular subsystem

2011-12-21 14:29:42 -08:00

systbls_32.S

sparc: Hook up process_vm_{readv,writev} syscalls.

2011-11-01 00:51:30 -07:00

systbls_64.S

sparc: Hook up process_vm_{readv,writev} syscalls.

2011-11-01 00:51:30 -07:00

systbls.h

improve sys_newuname() for compat architectures

2010-03-12 15:52:32 -08:00

tadpole.c

of/sparc: convert various prom_* functions to use phandle

2010-10-09 02:33:34 -06:00

time_32.c

Disintegrate asm/system.h for Sparc

2012-03-28 18:30:03 +01:00

time_64.c

sparc: move symbol exporters to use export.h not module.h

2011-10-31 19:30:53 -04:00

trampoline_32.S

sparc,leon: Sparc-Leon SMP support

2009-11-02 04:19:42 -08:00

trampoline_64.S

sparc,sparc64: unify kernel/

2008-12-04 09:17:21 -08:00

traps_32.c

Disintegrate asm/system.h for Sparc

2012-03-28 18:30:03 +01:00

traps_64.c

Disintegrate asm/system.h for Sparc

2012-03-28 18:30:03 +01:00

tsb.S

sparc64: Fix sun4u execute bit check in TSB I-TLB load.

2010-02-19 15:19:52 -08:00

ttable.S

sparc64: fix the build error due to smp_kgdb_capture_client()

2010-06-25 11:17:57 -07:00

una_asm_32.S

sparc32: unaligned memory access (MNA) trap handler bug

2011-02-01 12:39:59 -08:00

una_asm_64.S

sparc: Fix .size directive for do_int_load

2011-03-16 18:19:15 -07:00

unaligned_32.c

Disintegrate asm/system.h for Sparc

2012-03-28 18:30:03 +01:00

unaligned_64.c

Disintegrate asm/system.h for Sparc

2012-03-28 18:30:03 +01:00

us2e_cpufreq.c

sparc: Remove unnecessary semicolons

2011-06-07 16:06:34 -07:00

us3_cpufreq.c

sparc: Remove unnecessary semicolons

2011-06-07 16:06:34 -07:00

utrap.S

sparc,sparc64: unify kernel/

2008-12-04 09:17:21 -08:00

vio.c

powerpc+sparc/vio: Modernize driver registration

2012-03-28 11:33:24 +11:00

viohs.c

sparc: move symbol exporters to use export.h not module.h

2011-10-31 19:30:53 -04:00

visemul.c

Disintegrate asm/system.h for Sparc

2012-03-28 18:30:03 +01:00

vmlinux.lds.S

sparc: Access kernel TSB using physical addressing when possible.

2011-08-05 00:53:57 -07:00

windows.c

BKL: remove extraneous #include <smp_lock.h>

2010-11-17 08:59:32 -08:00

winfixup.S

sparc,sparc64: unify kernel/

2008-12-04 09:17:21 -08:00

wof.S

sparc/kernel/: possible cleanups

2008-07-17 21:37:46 -07:00

wuf.S

sparc/kernel/: possible cleanups

2008-07-17 21:37:46 -07:00