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2010-03-01Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-armLinus Torvalds
* 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm: (100 commits) ARM: Eliminate decompressor -Dstatic= PIC hack ARM: 5958/1: ARM: U300: fix inverted clk round rate ARM: 5956/1: misplaced parentheses ARM: 5955/1: ep93xx: move timer defines into core.c and document ARM: 5954/1: ep93xx: move gpio interrupt support to gpio.c ARM: 5953/1: ep93xx: fix broken build of clock.c ARM: 5952/1: ARM: MM: Add ARM_L1_CACHE_SHIFT_6 for handle inside each ARCH Kconfig ARM: 5949/1: NUC900 add gpio virtual memory map ARM: 5948/1: Enable timer0 to time4 clock support for nuc910 ARM: 5940/2: ARM: MMCI: remove custom DBG macro and printk ARM: make_coherent(): fix problems with highpte, part 2 MM: Pass a PTE pointer to update_mmu_cache() rather than the PTE itself ARM: 5945/1: ep93xx: include correct irq.h in core.c ARM: 5933/1: amba-pl011: support hardware flow control ARM: 5930/1: Add PKMAP area description to memory.txt. ARM: 5929/1: Add checks to detect overlap of memory regions. ARM: 5928/1: Change type of VMALLOC_END to unsigned long. ARM: 5927/1: Make delimiters of DMA area globally visibly. ARM: 5926/1: Add "Virtual kernel memory..." printout. ARM: 5920/1: OMAP4: Enable L2 Cache ... Fix up trivial conflict in arch/arm/mach-mx25/clock.c
2010-02-26Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/xfs-viptLinus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/jejb/xfs-vipt: xfs: fix xfs to work with Virtually Indexed architectures sh: add mm API for DMA to vmalloc/vmap areas arm: add mm API for DMA to vmalloc/vmap areas parisc: add mm API for DMA to vmalloc/vmap areas mm: add coherence API for DMA to vmalloc/vmap areas
2010-02-25Merge branches 'clks' and 'pnx' into develRussell King
2010-02-25Merge branch 'misc2' into develRussell King
2010-02-25Merge branch 'perf' into develRussell King
Conflicts: arch/arm/Kconfig
2010-02-25Merge branches 'at91', 'cache', 'cup', 'ep93xx', 'ixp4xx', 'nuc', ↵Russell King
'pending-dma-streaming', 'u300' and 'umc' into devel
2010-02-20MM: Pass a PTE pointer to update_mmu_cache() rather than the PTE itselfRussell King
On VIVT ARM, when we have multiple shared mappings of the same file in the same MM, we need to ensure that we have coherency across all copies. We do this via make_coherent() by making the pages uncacheable. This used to work fine, until we allowed highmem with highpte - we now have a page table which is mapped as required, and is not available for modification via update_mmu_cache(). Ralf Beache suggested getting rid of the PTE value passed to update_mmu_cache(): On MIPS update_mmu_cache() calls __update_tlb() which walks pagetables to construct a pointer to the pte again. Passing a pte_t * is much more elegant. Maybe we might even replace the pte argument with the pte_t? Ben Herrenschmidt would also like the pte pointer for PowerPC: Passing the ptep in there is exactly what I want. I want that -instead- of the PTE value, because I have issue on some ppc cases, for I$/D$ coherency, where set_pte_at() may decide to mask out the _PAGE_EXEC. So, pass in the mapped page table pointer into update_mmu_cache(), and remove the PTE value, updating all implementations and call sites to suit. Includes a fix from Stephen Rothwell: sparc: fix fallout from update_mmu_cache API change Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-02-20ARM: 5950/1: ARM: Fix build error for arm1026ej-s processorAbdoulaye Walsimou Gaye
This patch fix the below build error for arm1026ej-s processor (IntegratorCP/arm1026ej-s board). CC init/main.o In file included from include/linux/highmem.h:8, from include/linux/pagemap.h:10, from include/linux/mempolicy.h:62, from init/main.c:52: arch/arm/include/asm/cacheflush.h:134:2: error: #error Unknown cache maintainence model make[1]: *** [init/main.o] Erreur 1 make: *** [init] Erreur 2 Signed-off-by: Abdoulaye Walsimou Gaye <walsimou@walsimou.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-02-15ARM: 5928/1: Change type of VMALLOC_END to unsigned long.Fenkart/Bostandzhyan
Makes it consistent with VMALLOC_START Tested-by: H Hartley Sweeten <hsweeten@visionengravers.com> Signed-off-by: Andreas Fenkart <andreas.fenkart@streamunlimited.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-02-15ARM: 5927/1: Make delimiters of DMA area globally visibly.Fenkart/Bostandzhyan
Adds DMA area to 'virtual memory map' startup message Tested-by: H Hartley Sweeten <hsweeten@visionengravers.com> Signed-off-by: Andreas Fenkart <andreas.fenkart@streamunlimited.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-02-15ARM: vfp ptrace: no point flushing hw context for PTRACE_GETVFPREGSRussell King
If we're only reading the VFP context via the ptrace call, there's no need to invalidate the hardware context - we only need to do that on PTRACE_SETVFPREGS. This allows more efficient monitoring of a traced task. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-02-15ARM: 5905/1: ARM: Global ASID allocation on SMPCatalin Marinas
The current ASID allocation algorithm doesn't ensure the notification of the other CPUs when the ASID rolls over. This may lead to two processes using the same ASID (but different generation) or multiple threads of the same process using different ASIDs. This patch adds the broadcasting of the ASID rollover event to the other CPUs. To avoid a race on multiple CPUs modifying "cpu_last_asid" during the handling of the broadcast, the ASID numbering now starts at "smp_processor_id() + 1". At rollover, the cpu_last_asid will be set to NR_CPUS. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-02-15ARM: 5897/1: spinlock: don't use deprecated barriers on ARMv7Rabin Vincent
On ARMv7, the use of the cp15 operations for barriers is deprecated in favour of the isb, dsb, and dmb instructions. Change the locking functions to use the appropriate type of dsb for the architecture being built for. Signed-off-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-02-15ARM: 5889/1: Add atomic64 routines for ARMv6k and above.Will Deacon
In preparation for perf-events support, ARM needs to support atomic64_t operations. v6k and above support the ldrexd and strexd instructions to do just that. This patch adds atomic64 support to the ARM architecture. v6k and above make use of new instructions whilst older cores fall back on the generic solution using spinlocks. If and when v7-M cores are supported by Linux, they will need to fall back on the spinlock implementation too. Signed-off-by: Will Deacon <will.deacon@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-02-15ARM: add notify_die() supportRussell King
Kernel debuggers want to be informed of die() events, so that they can take some action to allow the problem to be inspected. Provide the hook in a similar manner to x86. Note that we currently don't implement the individual trap hooks. Acked-by: Jason Wessel <jason.wessel@windriver.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-02-15ARM: 5880/1: arm: use generic infrastructure for early paramsJeremy Kerr
The ARM setup code includes its own parser for early params, there's also one in the generic init code. This patch removes __early_init (and related code) from arch/arm/kernel/setup.c, and changes users to the generic early_init macro instead. The generic macro takes a char * argument, rather than char **, so we need to update the parser functions a little. Signed-off-by: Jeremy Kerr <jeremy.kerr@canonical.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-02-15ARM: remove old RTC supportRussell King
All RTC drivers have been converted to rtclib, so the old code providing the set_rtc function pointer, save_time_delta() and restore_time_delta() functions is obsolete. Remove it. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-02-15ARM: Add caller information to ioremapRussell King
This allows the procfs vmallocinfo file to show who created the ioremap regions. Note: __builtin_return_address(0) doesn't do what's expected if its used in an inline function, so we leave __arm_ioremap callers in such places alone. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-02-15ARM: dma-mapping: remove dmac_clean_range and dmac_inv_rangeRussell King
These are now unused, and so can be removed. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Tested-By: Santosh Shilimkar <santosh.shilimkar@ti.com>
2010-02-15ARM: dma-mapping: provide per-cpu type map/unmap functionsRussell King
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Tested-By: Santosh Shilimkar <santosh.shilimkar@ti.com>
2010-02-15ARM: dma-mapping: push buffer ownership down into dma-mapping.cRussell King
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Tested-By: Santosh Shilimkar <santosh.shilimkar@ti.com>
2010-02-15ARM: dma-mapping: introduce the idea of buffer ownershipRussell King
The DMA API has the notion of buffer ownership; make it explicit in the ARM implementation of this API. This gives us a set of hooks to allow us to deal with CPU cache issues arising from non-cache coherent DMA. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Tested-By: Santosh Shilimkar <santosh.shilimkar@ti.com> Tested-By: Jamie Iles <jamie@jamieiles.com>
2010-02-12ARM: Consolidate clks_register() and similarRussell King
Most machine classes want some way to register a block of clk_lookup structures, and most do it by implementing a clks_register() type function which walks an array, or by open-coding a loop. Consolidate all this into clkdev_add_table(). Acked-by: H Hartley Sweeten <hsweeten@visionengravers.com> Reviewed-by: Kevin Hilman <khilman@deeprootsystems.com> Acked-by: Eric Miao <eric.y.miao@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-02-12ARM: 5900/2: arm: enable support for software perf eventsJamie Iles
The perf events subsystem allows counting of both hardware and software events. This patch implements the bare minimum for software performance events. Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Jamie Iles <jamie.iles@picochip.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-02-12ARM: 5899/2: arm: provide a mechanism to reserve performance countersJamie Iles
To add support for perf events and to allow the hardware counters to be shared with oprofile, we need a way to reserve access to the pmu (performance monitor unit). Platforms with PMU interrupts should register the interrupts in arch/arm/kernel/pmu.c Signed-off-by: Jamie Iles <jamie.iles@picochip.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-02-05arm: add mm API for DMA to vmalloc/vmap areasJames Bottomley
ARM cannot prevent cache movein, so this patch implements both the flush and invalidate pieces of the API. Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2010-01-19ARM: 5888/1: arm: Update comments in cacheflush.h and remove unnecessary V6 ↵Tony Lindgren
and V7 comments The comments in cacheflush.h should follow what's in struct cpu_cache_fns. The comments for V6 and V7 are unnecessary. Signed-off-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-01-10ARM: 5872/1: ARM: include needed linux/cpu.h in asm/cpu.hSantosh Shilimkar
The file arch/arm/include/asm/cpu.h needs to include 'linux/cpu.h' to meet its dependency. Otherwise when using "struct cpuinfo_arm" and including just 'asm/cpu.h' throws below error - arch/arm/include/asm/cpu.h:16: error: field 'cpu' has incomplete type To fix this otherway, one can also include both linux/cpu.h and asm/cpu.h but it shoudn't be that way. So this patch fixes this by including the linux/cpu.h in asm/cpu.h, so that including alone asm/cpu.h is enough. Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-01-10ARM: 5870/1: arch/arm: Fix build failure for defconfigs without ↵Peter Hüwe
CONFIG_ISA_DMA_API set A lot of ARM-defconfigs (those without CONFIG_ISA_DMA_API set) fail to build [1][2][3] due to the changes of the patch [PATCH] PCI: Clean up build for CONFIG_PCI_QUIRKS unset by Rafael J. Wysocki (Sat, 2 Jan 2010 22:57:24 +0100) [4] as the referenced variable 'isa_dma_bridge_buggy' in asm/dma.h is enclosed by the CONFIG_ISA_DMA_API conditional all configs without this setting fail to build. I'm not sure wether moving the condition is the right way to solve the issue, but atleast it fixes the issue :) References: [1] http://kisskb.ellerman.id.au/kisskb/buildresult/1983354/ [2] http://kisskb.ellerman.id.au/kisskb/buildresult/1983333/ [3] http://kisskb.ellerman.id.au/kisskb/buildresult/1983337/ [4] http://lkml.org/lkml/2010/1/2/102 Signed-off-by: Peter Huewe <peterhuewe@gmx.de> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-01-08ARM: 5866/1: arm ptrace: use unsigned types for kernel pt_regsJamie Iles
Make registers unsigned for kernel space. This is important for example in the perf events where the PC is stored into a u64. We don't want it sign extended so make the regs unsigned to prevent casts throughout the kernel. Signed-off-by: Jamie Iles <jamie.iles@picochip.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-01-07ARM: add missing recvmmsg syscall numberRussell King
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-12-18ARM: Kill CONFIG_CPU_32Russell King
26-bit ARM support was removed a long time ago, and this symbol has been defined to be 'y' ever since. As it's never disabled anymore, we can kill it without any side effects. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-12-18ARM: Convert VFP/Crunch/XscaleCP thread_release() to exit_thread()Russell King
This avoids races in the VFP code where the dead thread may have state on another CPU. By moving this code to exit_thread(), we will be running as the thread, and therefore be running on the current CPU. This means that we can ensure that the only local state is accessed in the thread notifiers. Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-12-17Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-armLinus Torvalds
* 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm: PCMCIA: fix pxa2xx_lubbock modular build error [ARM] Update mach-types [ARM] pxa: fix no reference of cpu_is_pxa25x() in devices.c [ARM] pxa/cm-x300: add PWM backlight support revert "[ARM] pxa/cm-x300: add PWM backlight support" ARM: use flush_kernel_dcache_area() for dmabounce ARM: add size argument to __cpuc_flush_dcache_page ARM: 5848/1: kill flush_ioremap_region() ARM: cache-l2x0: make better use of background cache handling ARM: cache-l2x0: avoid taking spinlock for every iteration [ARM] Kirkwood: Add LaCie Network Space v2 support ARM: dove: fix the mm mmu flags of the pj4 procinfo
2009-12-17Merge branch 'cache' (early part)Russell King
2009-12-17Merge branch 'for-33' of git://repo.or.cz/linux-kbuildLinus Torvalds
* 'for-33' of git://repo.or.cz/linux-kbuild: (29 commits) net: fix for utsrelease.h moving to generated gen_init_cpio: fixed fwrite warning kbuild: fix make clean after mismerge kbuild: generate modules.builtin genksyms: properly consider EXPORT_UNUSED_SYMBOL{,_GPL}() score: add asm/asm-offsets.h wrapper unifdef: update to upstream revision 1.190 kbuild: specify absolute paths for cscope kbuild: create include/generated in silentoldconfig scripts/package: deb-pkg: use fakeroot if available scripts/package: add KBUILD_PKG_ROOTCMD variable scripts/package: tar-pkg: use tar --owner=root Kbuild: clean up marker net: add net_tstamp.h to headers_install kbuild: move utsrelease.h to include/generated kbuild: move autoconf.h to include/generated drop explicit include of autoconf.h kbuild: move compile.h to include/generated kbuild: drop include/asm kbuild: do not check for include/asm-$ARCH ... Fixed non-conflicting clean merge of modpost.c as per comments from Stephen Rothwell (modpost.c had grown an include of linux/autoconf.h that needed to be changed to generated/autoconf.h)
2009-12-16elf: kill USE_ELF_CORE_DUMPChristoph Hellwig
Currently all architectures but microblaze unconditionally define USE_ELF_CORE_DUMP. The microblaze omission seems like an error to me, so let's kill this ifdef and make sure we are the same everywhere. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Hugh Dickins <hugh.dickins@tiscali.co.uk> Cc: <linux-arch@vger.kernel.org> Cc: Michal Simek <michal.simek@petalogix.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-12-14genirq: Convert irq_desc.lock to raw_spinlockThomas Gleixner
Convert locks which cannot be sleeping locks in preempt-rt to raw_spinlocks. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Ingo Molnar <mingo@elte.hu>
2009-12-14locking: Convert raw_rwlock functions to arch_rwlockThomas Gleixner
Name space cleanup for rwlock functions. No functional change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra <peterz@infradead.org> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Ingo Molnar <mingo@elte.hu> Cc: linux-arch@vger.kernel.org
2009-12-14locking: Convert raw_rwlock to arch_rwlockThomas Gleixner
Not strictly necessary for -rt as -rt does not have non sleeping rwlocks, but it's odd to not have a consistent naming convention. No functional change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra <peterz@infradead.org> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Ingo Molnar <mingo@elte.hu> Cc: linux-arch@vger.kernel.org
2009-12-14locking: Convert __raw_spin* functions to arch_spin*Thomas Gleixner
Name space cleanup. No functional change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra <peterz@infradead.org> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Ingo Molnar <mingo@elte.hu> Cc: linux-arch@vger.kernel.org
2009-12-14locking: Rename __RAW_SPIN_LOCK_UNLOCKED to __ARCH_SPIN_LOCK_UNLOCKEDThomas Gleixner
Further name space cleanup. No functional change Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra <peterz@infradead.org> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Ingo Molnar <mingo@elte.hu> Cc: linux-arch@vger.kernel.org
2009-12-14locking: Convert raw_spinlock to arch_spinlockThomas Gleixner
The raw_spin* namespace was taken by lockdep for the architecture specific implementations. raw_spin_* would be the ideal name space for the spinlocks which are not converted to sleeping locks in preempt-rt. Linus suggested to convert the raw_ to arch_ locks and cleanup the name space instead of using an artifical name like core_spin, atomic_spin or whatever No functional change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra <peterz@infradead.org> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Ingo Molnar <mingo@elte.hu> Cc: linux-arch@vger.kernel.org
2009-12-14ARM: Fix ptrace accessesRussell King
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-12-14ARM: add size argument to __cpuc_flush_dcache_pageRussell King
... and rename the function since it no longer operates on just pages. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-12-14ARM: 5848/1: kill flush_ioremap_region()Nicolas Pitre
There is not enough users to warrant its existence, and it is actually an obstacle to progress with the new DMA API which cannot cover this case properly. To keep backward compatibility, let's perform the necessary custom cache maintenance locally in the only driver affected. Signed-off-by: Nicolas Pitre <nico@marvell.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-12-12arm: move mach-types to include/generatedSam Ravnborg
Simplified arch/arm/Makefile by dropping the maketools target It was undocumented and not needed Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Russell King <linux@arm.linux.org.uk> Signed-off-by: Michal Marek <mmarek@suse.cz>
2009-12-12kbuild: move asm-offsets.h to include/generatedSam Ravnborg
The simplest method was to add an extra asm-offsets.h file in arch/$ARCH/include/asm that references the generated file. We can now migrate the architectures one-by-one to reference the generated file direct - and when done we can delete the temporary arch/$ARCH/include/asm/asm-offsets.h file. Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Michal Marek <mmarek@suse.cz>
2009-12-11arm: add arch_mmap_check(), get rid of sys_arm_mremap()Al Viro
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2009-12-08Merge branch 'for-2.6.33' of git://git.kernel.dk/linux-2.6-blockLinus Torvalds
* 'for-2.6.33' of git://git.kernel.dk/linux-2.6-block: (113 commits) cfq-iosched: Do not access cfqq after freeing it block: include linux/err.h to use ERR_PTR cfq-iosched: use call_rcu() instead of doing grace period stall on queue exit blkio: Allow CFQ group IO scheduling even when CFQ is a module blkio: Implement dynamic io controlling policy registration blkio: Export some symbols from blkio as its user CFQ can be a module block: Fix io_context leak after failure of clone with CLONE_IO block: Fix io_context leak after clone with CLONE_IO cfq-iosched: make nonrot check logic consistent io controller: quick fix for blk-cgroup and modular CFQ cfq-iosched: move IO controller declerations to a header file cfq-iosched: fix compile problem with !CONFIG_CGROUP blkio: Documentation blkio: Wait on sync-noidle queue even if rq_noidle = 1 blkio: Implement group_isolation tunable blkio: Determine async workload length based on total number of queues blkio: Wait for cfq queue to get backlogged if group is empty blkio: Propagate cgroup weight updation to cfq groups blkio: Drop the reference to queue once the task changes cgroup blkio: Provide some isolation between groups ...