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* arch: mm: pass userspace fault flag to generic fault handlerJohannes Weiner2013-09-121-0/+2
| | | | | | | | | | | | | | | | | | | | Unlike global OOM handling, memory cgroup code will invoke the OOM killer in any OOM situation because it has no way of telling faults occuring in kernel context - which could be handled more gracefully - from user-triggered faults. Pass a flag that identifies faults originating in user space from the architecture-specific fault handlers to generic code so that memcg OOM handling can be improved. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: Michal Hocko <mhocko@suse.cz> Cc: David Rientjes <rientjes@google.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: azurIt <azurit@pobox.sk> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* mm: invoke oom-killer from remaining unconverted page fault handlersJohannes Weiner2013-07-091-3/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | A few remaining architectures directly kill the page faulting task in an out of memory situation. This is usually not a good idea since that task might not even use a significant amount of memory and so may not be the optimal victim to resolve the situation. Since 2.6.29's 1c0fe6e ("mm: invoke oom-killer from page fault") there is a hook that architecture page fault handlers are supposed to call to invoke the OOM killer and let it pick the right task to kill. Convert the remaining architectures over to this hook. To have the previous behavior of simply taking out the faulting task the vm.oom_kill_allocating_task sysctl can be set to 1. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: Michal Hocko <mhocko@suse.cz> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: David Rientjes <rientjes@google.com> Acked-by: Vineet Gupta <vgupta@synopsys.com> [arch/arc bits] Cc: James Hogan <james.hogan@imgtec.com> Cc: David Howells <dhowells@redhat.com> Cc: Jonas Bonn <jonas@southpole.se> Cc: Chen Liqin <liqin.chen@sunplusct.com> Cc: Lennox Wu <lennox.wu@gmail.com> Cc: Chris Metcalf <cmetcalf@tilera.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* mn10300/mm/fault.c: Port OOM changes to do_page_faultKautuk Consul2012-12-121-8/+25
| | | | | | | | | | | | | | | | | | Commit d065bd810b6deb67d4897a14bfe21f8eb526ba99 (mm: retry page fault when blocking on disk transfer) and commit 37b23e0525d393d48a7d59f870b3bc061a30ccdb (x86,mm: make pagefault killable) The above commits introduced changes into the x86 pagefault handler for making the page fault handler retryable as well as killable. These changes reduce the mmap_sem hold time, which is crucial during OOM killer invocation. Port these changes to mn10300. Signed-off-by: Kautuk Consul <consul.kautuk@gmail.com> Signed-off-by: David Howells <dhowells@redhat.com>
* Disintegrate asm/system.h for MN10300David Howells2012-03-281-1/+0
| | | | | | | Disintegrate asm/system.h for MN10300. Signed-off-by: David Howells <dhowells@redhat.com> cc: linux-am33-list@redhat.com
* MN10300: Create generic kernel debugger hooksDavid Howells2011-03-181-5/+4
| | | | | | | Create generic kernel debugger hooks in the MN10300 arch and make gdbstub use them. This is a preparation for KGDB support. Signed-off-by: David Howells <dhowells@redhat.com>
* MN10300: And Panasonic AM34 subarch and implement SMPAkira Takeuchi2010-10-271-8/+4
| | | | | | | | | | Implement the Panasonic MN10300 AM34 CPU subarch and implement SMP support for MN10300. Also implement support for the MN2WS0060 processor and the ASB2364 evaluation board which are AM34 based. Signed-off-by: Akira Takeuchi <takeuchi.akr@jp.panasonic.com> Signed-off-by: Kiyoshi Owada <owada.kiyoshi@jp.panasonic.com> Signed-off-by: David Howells <dhowells@redhat.com>
* MN10300: Remove monitor/JTAG functionsAkira Takeuchi2010-10-271-5/+0
| | | | | | | | | Remove the monitor trap function and the set_jtag_stub function as they're not really necessary. Signed-off-by: Akira Takeuchi <takeuchi.akr@jp.panasonic.com> Signed-off-by: Kiyoshi Owada <owada.kiyoshi@jp.panasonic.com> Signed-off-by: David Howells <dhowells@redhat.com>
* mn10300: invoke oom-killer from page faultNick Piggin2010-06-041-5/+4
| | | | | | | | | | | | | As explained in commit 1c0fe6e3bd ("mm: invoke oom-killer from page fault") , we want to call the architecture independent oom killer when getting an unexplained OOM from handle_mm_fault, rather than simply killing current. Signed-off-by: Nick Piggin <npiggin@suse.de> Acked-by: David Rientjes <rientjes@google.com> Acked-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* headers: smp_lock.h reduxAlexey Dobriyan2009-07-121-1/+0
| | | | | | | | | | | | | * Remove smp_lock.h from files which don't need it (including some headers!) * Add smp_lock.h to files which do need it * Make smp_lock.h include conditional in hardirq.h It's needed only for one kernel_locked() usage which is under CONFIG_PREEMPT This will make hardirq.h inclusion cheaper for every PREEMPT=n config (which includes allmodconfig/allyesconfig, BTW) Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Move FAULT_FLAG_xyz into handle_mm_fault() callersLinus Torvalds2009-06-211-1/+1
| | | | | | | | | | This allows the callers to now pass down the full set of FAULT_FLAG_xyz flags to handle_mm_fault(). All callers have been (mechanically) converted to the new calling convention, there's almost certainly room for architectures to clean up their code and then add FAULT_FLAG_RETRY when that support is added. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* MN10300: Change the fault handler to check in_atomic() not in_interrupt()David Howells2008-09-111-1/+1
| | | | | | | | | | | | | | | | | | | | | | | Change the MN10300 fault handler to make it check in_atomic() rather than in_interrupt() as commit 6edaf68a87d17570790fd55f0c451a29ec1d6703 did for other architectures: Author: Peter Zijlstra <a.p.zijlstra@chello.nl> Date: Wed Dec 6 20:32:18 2006 -0800 [PATCH] mm: arch do_page_fault() vs in_atomic() In light of the recent pagefault and filemap_copy_from_user work I've gone through all the arch pagefault handlers to make sure the inc_preempt_count() 'feature' works as expected. Several sections of code (including the new filemap_copy_from_user) rely on the fact that faults do not take locks under increased preempt count. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* mn10300: add the MN10300/AM33 architecture to the kernelDavid Howells2008-02-081-0/+405
Add architecture support for the MN10300/AM33 CPUs produced by MEI to the kernel. This patch also adds board support for the ASB2303 with the ASB2308 daughter board, and the ASB2305. The only processor supported is the MN103E010, which is an AM33v2 core plus on-chip devices. [akpm@linux-foundation.org: nuke cvs control strings] Signed-off-by: Masakazu Urade <urade.masakazu@jp.panasonic.com> Signed-off-by: Koichi Yasutake <yasutake.koichi@jp.panasonic.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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