linux-toradex.git/arch/um/kernel/trap.c, branch v3.9.2

Merge branch 'for-linus-37rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml

2012-10-10T02:15:20+00:00

Pull UML changes from Richard Weinberger:
 "UML receives this time only cleanups.

  The most outstanding change is the 'include "foo.h"' do 'include
  ' conversion done by Al Viro.

  It touches many files, that's why the diffstat is rather big."

* 'for-linus-37rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml:
  typo in UserModeLinux-HOWTO
  hppfs: fix the return value of get_inode()
  hostfs: drop vmtruncate
  um: get rid of pointless include "..." where include <...> will do
  um: move sysrq.h out of include/shared
  um/x86: merge 32 and 64 bit variants of ptrace.h
  um/x86: merge 32 and 64bit variants of checksum.h

um: get rid of pointless include "..." where include <...> will do

2012-10-09T20:28:45+00:00

Signed-off-by: Al Viro 
Signed-off-by: Richard Weinberger

readahead: fault retry breaks mmap file read random detection

2012-10-09T07:22:47+00:00

.fault now can retry.  The retry can break state machine of .fault.  In
filemap_fault, if page is miss, ra->mmap_miss is increased.  In the second
try, since the page is in page cache now, ra->mmap_miss is decreased.  And
these are done in one fault, so we can't detect random mmap file access.

Add a new flag to indicate .fault is tried once.  In the second try, skip
ra->mmap_miss decreasing.  The filemap_fault state machine is ok with it.

I only tested x86, didn't test other archs, but looks the change for other
archs is obvious, but who knows :)

Signed-off-by: Shaohua Li 
Cc: Rik van Riel 
Cc: Wu Fengguang 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

um: pass siginfo to guest process

2012-08-01T22:49:17+00:00

UML guest processes now get correct siginfo_t for SIGTRAP, SIGFPE,
SIGILL and SIGBUS. Specifically, si_addr and si_code are now correct
where previously they were si_addr = NULL and si_code = 128.

Signed-off-by: Martin Pärtel 
Signed-off-by: Richard Weinberger

um/kernel/trap.c: port OOM changes to handle_page_fault()

2012-06-01T00:49:26+00:00

Commit d065bd810b6d ("mm: retry page fault when blocking on disk
transfer") and commit 37b23e0525d3 ("x86,mm: make pagefault killable")
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 um.

Signed-off-by: Kautuk Consul 
Cc: Jeff Dike 
Cc: Richard Weinberger 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

um: distribute exports to where exported stuff is defined

2011-11-02T13:15:36+00:00

ksyms.c is down to the stuff defined in various USER_OBJS

Signed-off-by: Al Viro 
Signed-off-by: Richard Weinberger

um: kill includes of sysdep/sigcontext.h from stuff built with kernel headers

2011-11-02T13:14:54+00:00

Signed-off-by: Al Viro 
Signed-off-by: Richard Weinberger

um: print info about fatal segfaults

2011-05-25T15:39:41+00:00

Print a short info about fatal segfaults like other archs do.

Signed-off-by: Richard Weinberger 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Move FAULT_FLAG_xyz into handle_mm_fault() callers

2009-06-21T20:08:22+00:00

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

mm: invoke oom-killer from page fault

2009-01-06T23:58:58+00:00

Rather than have the pagefault handler kill a process directly if it gets
a VM_FAULT_OOM, have it call into the OOM killer.

With increasingly sophisticated oom behaviour (cpusets, memory cgroups,
oom killing throttling, oom priority adjustment or selective disabling,
panic on oom, etc), it's silly to unconditionally kill the faulting
process at page fault time.  Create a hook for pagefault oom path to call
into instead.

Only converted x86 and uml so far.

[akpm@linux-foundation.org: make __out_of_memory() static]
[akpm@linux-foundation.org: fix comment]
Signed-off-by: Nick Piggin 
Cc: Jeff Dike 
Acked-by: Ingo Molnar 
Cc: Thomas Gleixner 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds