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* 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6: (54 commits)
[S390] Remove error checking from copy_oldmem_page()
[S390] qdio: prevent dsci access without adapter interrupts
[S390] irqstats: split IPI interrupt accounting
[S390] add missing __tlb_flush_global() for !CONFIG_SMP
[S390] sparse: fix sparse symbol shadow warning
[S390] sparse: fix sparse NULL pointer warnings
[S390] sparse: fix sparse warnings with __user pointers
[S390] sparse: fix sparse warnings in math-emu
[S390] sparse: fix sparse warnings about missing prototypes
[S390] sparse: fix sparse ANSI-C warnings
[S390] sparse: fix sparse static warnings
[S390] sparse: fix access past end of array warnings
[S390] dasd: prevent path verification before resume
[S390] qdio: remove multicast polling
[S390] qdio: reset outbound SBAL error states
[S390] qdio: EQBS retry after CCQ 96
[S390] qdio: add timestamp for last queue scan time
[S390] Introduce get_clock_fast()
[S390] kvm: Handle diagnose 0x10 (release pages)
[S390] take mmap_sem when walking guest page table
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* 'next' of git://git.monstr.eu/linux-2.6-microblaze:
microblaze: Remove __ARCH_WANT_INTERRUPTS_ON_CTXSW usage
microblaze: Use delay slot in __strnlen_user, __strncpy_user
microblaze: Remove NET_IP_ALIGN from system.h
microblaze: Add __ucmpdi2() helper function
microblaze: Raise SIGFPE/FPE_INTDIV for div by zero
microblaze: Switch ELF_ARCH code to 189
microblaze: Added DMA sync operations
microblaze: Moved __dma_sync() to dma-mapping.h
microblaze: Add PVR for Microblaze v8.20.a
microblaze: Fix access_ok macro
microblaze: Add loop unrolling for PAGE in copy_tofrom_user
microblaze: Simplify logic for unaligned byte copying
microblaze: Change label names - copy_tofrom_user
microblaze: Separate fixup section definition
microblaze: Change label name in copy_tofrom_user
microblaze: Clear top bit from cnt32_to_63
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* 'for_linus' of git://cavan.codon.org.uk/platform-drivers-x86: (45 commits)
acer-wmi: replaced the hard coded bitmap by the communication devices bitmap from SMBIOS
acer-wmi: check the existence of internal wireless device when set capability
acer-wmi: add ACER_WMID_v2 interface flag to represent new notebooks
sony-laptop:irq: Remove IRQF_DISABLED
asus-laptop: Add rfkill support for Pegatron Lucid tablet
asus-laptop: pega_accel - Report accelerometer orientation change through udev
asus-laptop: fix module description
asus-laptop: hide leds on Pegatron Lucid
asus-laptop: Pegatron Lucid accelerometer
asus-laptop: allow boot time control of Pegatron ALS sensor
Platform: samsung_laptop: add support for X520 machines.
platform: samsung_laptop: add dmi information for Samsung R700 laptops
hp_accel: Add axis-mapping for HP ProBook / EliteBook
hp_accel: Add a new PNP id
WMI: properly cleanup devices to avoid crashes
ideapad: remove sysfs node for cfg
ideapad: add debugfs support
ideapad: add event for Novo key
ideapad: change parameter of ideapad_sync_rfk_state
ideapad: define vpc commands
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git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media
* 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (348 commits)
[media] pctv452e: Remove bogus code
[media] adv7175: Make use of media bus pixel codes
[media] media: vb2: fix incorrect return value
[media] em28xx: implement VIDIOC_ENUM_FRAMESIZES
[media] cx23885: Stop the risc video fifo before reconfiguring it
[media] cx23885: Avoid incorrect error handling and reporting
[media] cx23885: Avoid stopping the risc engine during buffer timeout
[media] cx23885: Removed a spurious function cx23885_set_scale()
[media] cx23885: v4l2 api compliance, set the audioset field correctly
[media] cx23885: hook the audio selection functions into the main driver
[media] cx23885: add generic functions for dealing with audio input selection
[media] cx23885: fixes related to maximum number of inputs and range checking
[media] cx23885: Initial support for the MPX-885 mini-card
[media] cx25840: Ensure AUDIO6 and AUDIO7 trigger line-in baseband use
[media] cx23885: Enable audio line in support from the back panel
[media] cx23885: Allow the audio mux config to be specified on a per input basis
[media] cx25840: Enable support for non-tuner LR1/LR2 audio inputs
[media] cx23885: Name an internal i2c part and declare a bitfield by name
[media] cx23885: Ensure VBI buffers timeout quickly - bugfix for vbi hangs during streaming
[media] cx23885: remove channel dump diagnostics when a vbi buffer times out
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Fix up trivial conflicts in drivers/misc/altera-stapl/altera.c (header
file rename vs add)
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* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (27 commits)
vlan: allow nested vlan_do_receive()
ipv6: fix route lookup in addrconf_prefix_rcv()
bonding: eliminate bond_close race conditions
qlcnic: fix beacon and LED test.
qlcnic: Updated License file
qlcnic: updated reset sequence
qlcnic: reset loopback mode if promiscous mode setting fails.
qlcnic: skip IDC ack check in fw reset path.
i825xx: Fix incorrect dependency for BVME6000_NET
ipv6: fix route error binding peer in func icmp6_dst_alloc
ipv6: fix error propagation in ip6_ufo_append_data()
stmmac: update normal descriptor structure (v2)
stmmac: fix NULL pointer dereference in capabilities fixup (v2)
stmmac: fix a bug while checking the HW cap reg (v2)
be2net: Changing MAC Address of a VF was broken.
be2net: Refactored be_cmds.c file.
bnx2x: update driver version to 1.70.30-0
bnx2x: use FW 7.0.29.0
bnx2x: Enable changing speed when port type is PORT_DA
bnx2x: Fix 54618se LED behavior
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* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc:
sparc64: Fix masking and shifting in VIS fpcmp emulation.
sparc32: Correct the return value of memcpy.
sparc32: Remove uses of %g7 in memcpy implementation.
sparc32: Remove non-kernel code from memcpy implementation.
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* 'for-linus' of git://neil.brown.name/md:
md/raid10: Fix bug when activating a hot-spare.
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Signed-off-by: David S. Miller <davem@davemloft.net>
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This is a fairly serious bug in RAID10.
When a RAID10 array is degraded and a hot-spare is activated, the
spare does not take up the empty slot, but rather replaces the first
working device.
This is likely to make the array non-functional. It would normally
be possible to recover the data, but that would need care and is not
guaranteed.
This bug was introduced in commit
2bb77736ae5dca0a189829fbb7379d43364a9dac
which first appeared in 3.1.
Cc: stable@kernel.org
Signed-off-by: NeilBrown <neilb@suse.de>
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git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging
* 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging:
i2c: Functions for byte-swapped smbus_write/read_word_data
i2c-algo-pca: Return standard fault codes
i2c-algo-bit: Return standard fault codes
i2c-algo-bit: Be verbose on bus testing failure
i2c-algo-bit: Let user test buses without failing
i2c/scx200_acb: Fix section mismatch warning in scx200_pci_drv
i2c: I2C_ELEKTOR should depend on HAS_IOPORT
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* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu: (33 commits)
iommu/core: Remove global iommu_ops and register_iommu
iommu/msm: Use bus_set_iommu instead of register_iommu
iommu/omap: Use bus_set_iommu instead of register_iommu
iommu/vt-d: Use bus_set_iommu instead of register_iommu
iommu/amd: Use bus_set_iommu instead of register_iommu
iommu/core: Use bus->iommu_ops in the iommu-api
iommu/core: Convert iommu_found to iommu_present
iommu/core: Add bus_type parameter to iommu_domain_alloc
Driver core: Add iommu_ops to bus_type
iommu/core: Define iommu_ops and register_iommu only with CONFIG_IOMMU_API
iommu/amd: Fix wrong shift direction
iommu/omap: always provide iommu debug code
iommu/core: let drivers know if an iommu fault handler isn't installed
iommu/core: export iommu_set_fault_handler()
iommu/omap: Fix build error with !IOMMU_SUPPORT
iommu/omap: Migrate to the generic fault report mechanism
iommu/core: Add fault reporting mechanism
iommu/core: Use PAGE_SIZE instead of hard-coded value
iommu/core: use the existing IS_ALIGNED macro
iommu/msm: ->unmap() should return order of unmapped page
...
Fixup trivial conflicts in drivers/iommu/Makefile: "move omap iommu to
dedicated iommu folder" vs "Rename the DMAR and INTR_REMAP config
options" just happened to touch lines next to each other.
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* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp:
amd64_edac: Cleanup return type of amd64_determine_edac_cap()
amd64_edac: Add a fix for Erratum 505
EDAC, MCE, AMD: Simplify NB MCE decoder interface
EDAC, MCE, AMD: Drop local coreid reporting
EDAC, MCE, AMD: Print valid addr when reporting an error
EDAC, MCE, AMD: Print CPU number when reporting the error
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git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm
* 'kvm-updates/3.2' of git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm: (75 commits)
KVM: SVM: Keep intercepting task switching with NPT enabled
KVM: s390: implement sigp external call
KVM: s390: fix register setting
KVM: s390: fix return value of kvm_arch_init_vm
KVM: s390: check cpu_id prior to using it
KVM: emulate lapic tsc deadline timer for guest
x86: TSC deadline definitions
KVM: Fix simultaneous NMIs
KVM: x86 emulator: convert push %sreg/pop %sreg to direct decode
KVM: x86 emulator: switch lds/les/lss/lfs/lgs to direct decode
KVM: x86 emulator: streamline decode of segment registers
KVM: x86 emulator: simplify OpMem64 decode
KVM: x86 emulator: switch src decode to decode_operand()
KVM: x86 emulator: qualify OpReg inhibit_byte_regs hack
KVM: x86 emulator: switch OpImmUByte decode to decode_imm()
KVM: x86 emulator: free up some flag bits near src, dst
KVM: x86 emulator: switch src2 to generic decode_operand()
KVM: x86 emulator: expand decode flags to 64 bits
KVM: x86 emulator: split dst decode to a generic decode_operand()
KVM: x86 emulator: move memop, memopp into emulation context
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* 'fbdev-next' of git://github.com/schandinat/linux-2.6: (270 commits)
video: platinumfb: Add __devexit_p at necessary place
drivers/video: fsl-diu-fb: merge diu_pool into fsl_diu_data
drivers/video: fsl-diu-fb: merge diu_hw into fsl_diu_data
drivers/video: fsl-diu-fb: only DIU modes 0 and 1 are supported
drivers/video: fsl-diu-fb: remove unused panel operating mode support
drivers/video: fsl-diu-fb: use an enum for the AOI index
drivers/video: fsl-diu-fb: add several new video modes
drivers/video: fsl-diu-fb: remove broken screen blanking support
drivers/video: fsl-diu-fb: move some definitions out of the header file
drivers/video: fsl-diu-fb: fix some ioctls
video: da8xx-fb: Increased resolution configuration of revised LCDC IP
OMAPDSS: picodlp: add missing #include <linux/module.h>
fb: fix au1100fb bitrot.
mx3fb: fix NULL pointer dereference in screen blanking.
video: irq: Remove IRQF_DISABLED
smscufx: change edid data to u8 instead of char
OMAPDSS: DISPC: zorder support for DSS overlays
OMAPDSS: DISPC: VIDEO3 pipeline support
OMAPDSS/OMAP_VOUT: Fix incorrect OMAP3-alpha compatibility setting
video/omap: fix build dependencies
...
Fix up conflicts in:
- drivers/staging/xgifb/XGI_main_26.c
Changes to XGIfb_pan_var()
- drivers/video/omap/{lcd_apollon.c,lcd_ldp.c,lcd_overo.c}
Removed (or in the case of apollon.c, merged into the generic
DSS panel in drivers/video/omap2/displays/panel-generic-dpi.c)
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Currently it can happen that the pre-allocated ELF header contains a wrong
memory map which would result in errors when copying /proc/vmcore.
In order to still get a valid vmcore, we (temporarily) disable the error
checking in copy_oldmem_page(). This will then produce zero pages for those
memory regions.
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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A kernel panic may occur during sending or receiving network packets
on a machine without adapter interrupts since commit d36deae.
The bug is triggered by writing to the shared indicator address which
is set to 0 if the machine doesn't have adapter interrupts.
Make the reading and setting of the shared indicator dependent on the
adapter interrupt feature and while at it move the code to the
file containing the adapter interrupt related code.
Thanks to Jan Jaeger for tracking this down.
Reported-by: Jan Jaeger <jan.jaeger@westnet.com.au>
Tested-by: Jan Jaeger <jan.jaeger@westnet.com.au>
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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We use both the external call and emergency call IPIs to signal remote
cpus. Therefore it makes sense to account them differently withing
/proc/irqstats so we actually know what happened.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Fix this compiler error for !CONFIG_SMP:
CC arch/s390/mm/pgtable.o
arch/s390/mm/pgtable.c: In function ‘gmap_flush_tlb’:
arch/s390/mm/pgtable.c:202:3: error: implicit declaration of function ‘__tlb_flush_global’ [-Werror=implicit-function-declaration]
cc1: some warnings being treated as errors
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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to_kvmdev and dev_to_virtio both use container_of. Avoid to nest the
two macros to quiet the following sparse warning:
drivers/s390/kvm/kvm_virtio.c:337:20: warning: symbol '__mptr' shadows an earlier one
drivers/s390/kvm/kvm_virtio.c:337:20: originally declared here
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Fix two NULL pointer warnings in the dasd driver:
drivers/s390/block/dasd_eckd.c:2353:20: warning: Using plain integer as NULL pointer
drivers/s390/block/dasd_eckd.c:2415:44: warning: Using plain integer as NULL pointer
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Use __force to quiet sparse warnings about user address space.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Fix three sparse warnings in math-emu / sysinfo:
arch/s390/kernel/sysinfo.c:448:17: error: return expression in void function
arch/s390/kernel/sysinfo.c:445:25: warning: shift too big (32) for type unsigned int
arch/s390/kernel/sysinfo.c:445:25: warning: shift too big (32) for type unsigned int
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Add prototypes and includes for functions used in different modules.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Fix prototype of some functions in arch/s390/oprofile to avoid non-ANSI
warnings from sparse.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Make functions and data static to avoid sparse warnings.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Remove unnecessary code to avoid false positives from sparse, e.g.
arch/s390/kernel/compat_signal.c:221:61: warning: invalid access past the end of 'set32' (8 8)
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Mark the device as suspended and delay execution of the path
verification worker to prevent mix-up.
Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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The multicast poll check for the outbound queue is redundant since
3d6c76f "[S390] qdio: outbound tasklet scan threshold". Remove the check.
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Don't leave outbound SBALs in error state after a target full condition.
Reset the state to not initialized to make the error handling consistent
across all types of errors.
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Running under z/VM with QIOASSIST enabled, qdio queues could stall if EQBS
did not extract all SBAL states. Add an instant retry for EQBS and, if the
retry fails, set up a timer to ensure outstanding SBALs are processed later.
While at it, optimize qdio_do_eqbs and qdio_do_sqbs to eliminate 3 jumps on
the hot path.
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Add a timestamp per queue and update the timestamp when the queue is
scanned. Add the queue timestamps and the timestamp of the last
adapter interrupt to the debugfs output. The timestamps are useful
for debugging stall conditions.
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Add get_clock_fast() which uses the slightly faster stckf if available.
If stckf is not available fall back to stck, which has the same width.
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Linux on System z uses a ballooner based on diagnose 0x10. (aka as
collaborative memory management). This patch implements diagnose
0x10 on the guest address space.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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gmap_fault needs to walk the guest page table. However, parts of
that may change if some other thread does munmap. In that case
gmap_unmap_notifier will also unmap the corresponding parts from
the guest page table. We need to take mmap_sem in order to serialize
these operations.
do_exception now calls __gmap_fault with mmap_sem held which does
not get exported to modules. The exported function, which is called
from KVM, now takes mmap_sem.
Reported-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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This introduces locking via mm->page_table_lock to protect
the rmap list for guest mappings from being corrupted by concurrent
operations.
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Fix possible deadlock reported by lockdep:
qemu-system-s39/2963 is trying to acquire lock:
(&mm->mmap_sem){++++++}, at: gmap_alloc_table+0x9c/0x120
but task is already holding lock:
(&mm->mmap_sem){++++++}, at: gmap_map_segment+0xa6/0x27c
Actually gmap_alloc_table is the only called in gmap_map_segment with
mmap_sem held, thus it's safe to simply remove the inner lock.
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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On sie_fault we need to switch back to user ASCE. Otherwise we get
interresting effects when exiting to "userspace" while the guest
space is still active.
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Use a sigp sense running to decide which signal processor order to use
for an ipi. If the target cpu is running use external call, if the target
cpu is not running use emergency signal.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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The buffer for read configuration data has to be initialized with an
EBCDIC string to show support for extended UIDs to z/VM.
If this read configuration data CQR needs to be retried, the buffer
may have changed in between. So re-initialize the buffer to get a
correct extended UID under z/VM.
Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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After terminating a request in the dasd_sleep_on_immediatly function,
wait for the clear interrupt to be received before starting the
new request. This prevents the requests from getting mixed up.
Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Add missing module.h include to prevent build breakage after the
module.h split work hits Linus' tree.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Add support for CHSC I/O interrupt statistics in /proc/interrupts.
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Fix coding style, remove forward declerations, simplify code.
Also remove a superfluous get_device/put_device pair in
ccwgroup_create_from_string.
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Put sysfs attributes of ccwgroup devices in an attribute group to
ensure that these attributes are actually present when userspace
is notified via uevents.
Cc: stable@kernel.org
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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The user space program can change its addressing mode between the
24-bit, 31-bit and the 64-bit mode if the kernel is 64 bit. Currently
the kernel always forces the standard amode on signal delivery and
signal return and on ptrace: 64-bit for a 64-bit process, 31-bit for
a compat process and 31-bit kernels. Change the signal and ptrace code
to allow the full range of addressing modes. Signal handlers are
run in the standard addressing mode for the process.
One caveat is that even an 31-bit compat process can switch to the
64-bit mode. The next signal will switch back into the 31-bit mode
and there is no room in the 31-bit compat signal frame to store the
information that the program came from the 64-bit mode.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Split out addressing mode bits from PSW_BASE_BITS, rename PSW_BASE_BITS
to PSW_MASK_BASE, get rid of psw_user32_bits, remove unused function
enabled_wait(), introduce PSW_MASK_USER, and drop PSW_MASK_MERGE macros.
Change psw_kernel_bits / psw_user_bits to contain only the bits that
are always set in the respective mode.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Add an explicit TIF_SYSCALL bit that indicates if a task is inside
a system call. The svc_code in the pt_regs structure is now only
valid if TIF_SYSCALL is set. With this definition TIF_RESTART_SVC
can be replaced with TIF_SYSCALL. Overall do_signal is a bit more
readable and it saves a few lines of code.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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An instruction with an address right below the adress limit for the
current addressing mode will wrap. The instruction restart logic in
the protection fault handler and the signal code need to follow the
wrapping rules to find the correct instruction address.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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For a ERESTARTNOHAND/ERESTARTSYS/ERESTARTNOINTR restarting system call
do_signal will prepare the restart of the system call with a rewind of
the PSW before calling get_signal_to_deliver (where the debugger might
take control). For A ERESTART_RESTARTBLOCK restarting system call
do_signal will set -EINTR as return code.
There are two issues with this approach:
1) strace never sees ERESTARTNOHAND, ERESTARTSYS, ERESTARTNOINTR or
ERESTART_RESTARTBLOCK as the rewinding already took place or the
return code has been changed to -EINTR
2) if get_signal_to_deliver does not return with a signal to deliver
the restart via the repeat of the svc instruction is left in place.
This opens a race if another signal is made pending before the
system call instruction can be reexecuted. The original system call
will be restarted even if the second signal would have ended the
system call with -EINTR.
These two issues can be solved by dropping the early rewind of the
system call before get_signal_to_deliver has been called and by using
the TIF_RESTART_SVC magic to do the restart if no signal has to be
delivered. The only situation where the system call restart via the
repeat of the svc instruction is appropriate is when a SA_RESTART
signal is delivered to user space.
Unfortunately this breaks inferior calls by the debugger again. The
system call number and the length of the system call instruction is
lost over the inferior call and user space will see ERESTARTNOHAND/
ERESTARTSYS/ERESTARTNOINTR/ERESTART_RESTARTBLOCK. To correct this a
new ptrace interface is added to save/restore the system call number
and system call instruction length.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
|
|
Switching on the DEVTMPFS kernel option helpes to maintain a /dev
file system early in the boot process, especially, in limited
environments.
Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
|
