kernel/git/stable/linux-stable.git/drivers/char/mem.c, branch linux-2.6.32.y

char: Mark /dev/zero and /dev/kmem as not capable of writeback

2010-09-27T00:21:26+00:00

commit 371d217ee1ff8b418b8f73fb2a34990f951ec2d4 upstream. These devices don't do any writeback but their device inodes still can get dirty so mark bdi appropriately so that bdi code does the right thing and files inodes to lists of bdi carrying the device inodes. Signed-off-by: Jan Kara Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman

devmem: fix kmem write bug on memory holes

2010-02-23T15:37:54+00:00

commit c85e9a97c4102ce2e83112da850d838cfab5ab13 upstream devmem: fix kmem write bug on memory holes [ cebbert@redhat.com : backport to 2.6.32 ] write_kmem() used to assume vwrite() always return the full buffer length. However now vwrite() could return 0 to indicate memory hole. This creates a bug that "buf" is not advanced accordingly. Fix it to simply ignore the return value, hence the memory hole. Signed-off-by: Wu Fengguang Cc: Andi Kleen Cc: Benjamin Herrenschmidt Cc: Christoph Lameter Cc: Ingo Molnar Cc: Tejun Heo Cc: Nick Piggin Cc: KAMEZAWA Hiroyuki Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Cc: Chuck Ebbert Signed-off-by: Greg Kroah-Hartman

devmem: check vmalloc address on kmem read/write

2010-02-23T15:37:54+00:00

commit 325fda71d0badc1073dc59f12a948f24ff05796a [ cebbert@redhat.com : backport to 2.6.32 ] devmem: check vmalloc address on kmem read/write Otherwise vmalloc_to_page() will BUG(). This also makes the kmem read/write implementation aligned with mem(4): "References to nonexistent locations cause errors to be returned." Here we return -ENXIO (inspired by Hugh) if no bytes have been transfered to/from user space, otherwise return partial read/write results. Signed-off-by: KAMEZAWA Hiroyuki Signed-off-by: Wu Fengguang Cc: Greg Kroah-Hartman Cc: Hugh Dickins Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Cc: Chuck Ebbert Signed-off-by: Greg Kroah-Hartman

/dev/mem: introduce size_inside_page()

2010-02-23T15:37:54+00:00

commit f222318e9c3a315723e3524fb9d6566b2430db44 upstream /dev/mem: introduce size_inside_page() [ cebbert@redhat.com : backport to 2.6.32 ] [ subset of original patch, for just /dev/kmem ] Introduce size_inside_page() to replace duplicate /dev/mem code. Also apply it to /dev/kmem, whose alignment logic was buggy. Signed-off-by: Wu Fengguang Acked-by: Andi Kleen Cc: Marcelo Tosatti Cc: Greg Kroah-Hartman Cc: Mark Brown Cc: Johannes Berg Cc: Avi Kivity Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Cc: Chuck Ebbert Signed-off-by: Greg Kroah-Hartman

const: mark struct vm_struct_operations

2009-09-27T18:39:25+00:00

* mark struct vm_area_struct::vm_ops as const * mark vm_ops in AGP code But leave TTM code alone, something is fishy there with global vm_ops being used. Signed-off-by: Alexey Dobriyan Signed-off-by: Linus Torvalds

/dev/zero: avoid repeated access_ok() checks

2009-09-24T14:21:03+00:00

In read_zero, we check for access_ok() once for the count bytes. It is unnecessarily checked again in clear_user. Use __clear_user, which does not check for access_ok(). Signed-off-by: Nikanth Karthikesan Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

Driver-Core: extend devnode callbacks to provide permissions

2009-09-19T19:50:38+00:00

This allows subsytems to provide devtmpfs with non-default permissions for the device node. Instead of the default mode of 0600, null, zero, random, urandom, full, tty, ptmx now have a mode of 0666, which allows non-privileged processes to access standard device nodes in case no other userspace process applies the expected permissions. This also fixes a wrong assignment in pktcdvd and a checkpatch.pl complain. Signed-off-by: Kay Sievers Signed-off-by: Greg Kroah-Hartman

mem_class: fix bug

2009-09-15T16:50:47+00:00

When I build and boot -next on fedora 10, I can not login anymore. When I input the user name and password, the system does not output any message and requires user to input the user name and password again and again. I find the patch which caused this problem with "GIT BISECT" command. And the patch is commit 7c4b7daa1878972ed0137c95f23569124bd6e2b1 "mem_class: use minor as index instead of searching the array". Though I don't know the real reason why user could not login, I confirmed the patch I made as following could resolve the problem on fedora 10. Signed-off-by: Jin Dongming Acked-by: Kay Sievers Signed-off-by: Greg Kroah-Hartman

mem_class: use minor as index instead of searching the array

2009-09-15T16:50:47+00:00

Declare the device list with the minor numbers as the index, which saves us from searching for a matching list entry. Remove old devfs permissions declaration. Signed-off-by: Kay Sievers Signed-off-by: Greg Kroah-Hartman

writeback: add name to backing_dev_info

2009-09-11T07:20:26+00:00

This enables us to track who does what and print info. Its main use is catching dirty inodes on the default_backing_dev_info, so we can fix that up. Signed-off-by: Jens Axboe