kernel.git/arch/alpha/Kconfig, branch linux-2.6.28.y

container freezer: implement freezer cgroup subsystem

2008-10-20T15:52:34Z

This patch implements a new freezer subsystem in the control groups framework. It provides a way to stop and resume execution of all tasks in a cgroup by writing in the cgroup filesystem. The freezer subsystem in the container filesystem defines a file named freezer.state. Writing "FROZEN" to the state file will freeze all tasks in the cgroup. Subsequently writing "RUNNING" will unfreeze the tasks in the cgroup. Reading will return the current state. * Examples of usage : # mkdir /containers/freezer # mount -t cgroup -ofreezer freezer /containers # mkdir /containers/0 # echo $some_pid > /containers/0/tasks to get status of the freezer subsystem : # cat /containers/0/freezer.state RUNNING to freeze all tasks in the container : # echo FROZEN > /containers/0/freezer.state # cat /containers/0/freezer.state FREEZING # cat /containers/0/freezer.state FROZEN to unfreeze all tasks in the container : # echo RUNNING > /containers/0/freezer.state # cat /containers/0/freezer.state RUNNING This is the basic mechanism which should do the right thing for user space task in a simple scenario. It's important to note that freezing can be incomplete. In that case we return EBUSY. This means that some tasks in the cgroup are busy doing something that prevents us from completely freezing the cgroup at this time. After EBUSY, the cgroup will remain partially frozen -- reflected by freezer.state reporting "FREEZING" when read. The state will remain "FREEZING" until one of these things happens: 1) Userspace cancels the freezing operation by writing "RUNNING" to the freezer.state file 2) Userspace retries the freezing operation by writing "FROZEN" to the freezer.state file (writing "FREEZING" is not legal and returns EIO) 3) The tasks that blocked the cgroup from entering the "FROZEN" state disappear from the cgroup's set of tasks. [akpm@linux-foundation.org: coding-style fixes] [akpm@linux-foundation.org: export thaw_process] Signed-off-by: Cedric Le Goater Signed-off-by: Matt Helsley Acked-by: Serge E. Hallyn Tested-by: Matt Helsley Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

Alpha Miata: remove dead URL

2008-10-16T18:21:29Z

Remove a dead URL. Cc: Yoshinori Sato Signed-off-by: Adrian Bunk Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

Introduce HAVE_AOUT symbol to remove hard-coded arch list for BINFMT_AOUT

2008-09-06T18:30:22Z

HAVE_AOUT doesn't quite do the same thing as the recently removed ARCH_SUPPORTS_AOUT config option. That was set even on platforms where binfmt_aout isn't supported, although it's not entirely clear why. So it's best just to introduce a new symbol, handled consistently with other similar HAVE_xxx symbols; with a simple 'select' in the arch Kconfig. Signed-off-by: David Woodhouse

Remove redundant CONFIG_ARCH_SUPPORTS_AOUT

2008-09-06T18:30:20Z

We don't need this any more; arguably we never really did. Signed-off-by: David Woodhouse

alpha: remove the unused ALPHA_CORE_AGP option

2008-07-24T17:47:22Z

The real option is named AGP_ALPHA_CORE. Reviewed-by: Robert P. J. Day Signed-off-by: Adrian Bunk Cc: Richard Henderson Cc: Ivan Kokshaysky Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

alpha: convert to generic helpers for IPI function calls

2008-06-26T09:22:57Z

This converts alpha to use the new helpers for smp_call_function() and friends, and adds support for smp_call_function_single(). Signed-off-by: Jens Axboe

alpha: use iommu_is_span_boundary helper function

2008-03-13T20:11:43Z

iommu_is_span_boundary in lib/iommu-helper.c was exported for PARISC IOMMUs (commit 3715863aa142c4f4c5208f5f3e5e9bac06006d2f). Alpha's IOMMU can use it. This removes the check on the boundary size alignment because iommu_is_span_boundary does. Signed-off-by: FUJITA Tomonori Cc: Richard Henderson Acked-by: Ivan Kokshaysky Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

ide: introduce HAVE_IDE

2008-02-09T09:46:40Z

To allow flexible configuration of IDE introduce HAVE_IDE. All archs except arm, um and s390 unconditionally select it. For arm the actual configuration determine if IDE is supported. This is a step towards introducing drivers/Kconfig for arm. Signed-off-by: Sam Ravnborg Acked-by: Russell King - ARM Linux Acked-by: Bartlomiej Zolnierkiewicz

avoid overflows in kernel/time.c

2008-02-08T17:22:39Z

When the conversion factor between jiffies and milli- or microseconds is not a single multiply or divide, as for the case of HZ == 300, we currently do a multiply followed by a divide. The intervening result, however, is subject to overflows, especially since the fraction is not simplified (for HZ == 300, we multiply by 300 and divide by 1000). This is exposed to the user when passing a large timeout to poll(), for example. This patch replaces the multiply-divide with a reciprocal multiplication on 32-bit platforms. When the input is an unsigned long, there is no portable way to do this on 64-bit platforms there is no portable way to do this since it requires a 128-bit intermediate result (which gcc does support on 64-bit platforms but may generate libgcc calls, e.g. on 64-bit s390), but since the output is a 32-bit integer in the cases affected, just simplify the multiply-divide (*3/10 instead of *300/1000). The reciprocal multiply used can have off-by-one errors in the upper half of the valid output range. This could be avoided at the expense of having to deal with a potential 65-bit intermediate result. Since the intent is to avoid overflow problems and most of the other time conversions are only semiexact, the off-by-one errors were considered an acceptable tradeoff. At Ralf Baechle's suggestion, this version uses a Perl script to compute the necessary constants. We already have dependencies on Perl for kernel compiles. This does, however, require the Perl module Math::BigInt, which is included in the standard Perl distribution starting with version 5.8.0. In order to support older versions of Perl, include a table of canned constants in the script itself, and structure the script so that Math::BigInt isn't required if pulling values from said table. Running the script requires that the HZ value is available from the Makefile. Thus, this patch also adds the Kconfig variable CONFIG_HZ to the architectures which didn't already have it (alpha, cris, frv, h8300, m32r, m68k, m68knommu, sparc, v850, and xtensa.) It does *not* touch the sh or sh64 architectures, since Paul Mundt has dealt with those separately in the sh tree. Signed-off-by: H. Peter Anvin Cc: Ralf Baechle , Cc: Sam Ravnborg , Cc: Paul Mundt , Cc: Richard Henderson , Cc: Michael Starvik , Cc: David Howells , Cc: Yoshinori Sato , Cc: Hirokazu Takata , Cc: Geert Uytterhoeven , Cc: Roman Zippel , Cc: William L. Irwin , Cc: Chris Zankel , Cc: H. Peter Anvin , Cc: Jan Engelhardt Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

aout: mark arches that support A.OUT format

2008-02-08T17:22:30Z

Mark arches that support A.OUT format by including the following in their master Kconfig files: config ARCH_SUPPORTS_AOUT def_bool y This should also be set if the arch provides compatibility A.OUT support for an older arch, for instance x86_64 for i386 or sparc64 for sparc. I've guessed at which arches don't, based on comments in the code, however I'm sure that some of the ones I've marked as 'yes' actually should be 'no'. Signed-off-by: David Howells Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds