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The s390 kernel does not compile if virtio console is enabled, but guest
support is disabled:
LD .tmp_vmlinux1
arch/s390/kernel/built-in.o: In function `setup_arch':
/space/linux-2.5/arch/s390/kernel/setup.c:773: undefined reference to
`s390_virtio_console_init'
The fix is related to
commit 99e65c92f2bbf84f43766a8bf701e36817d62822
Author: Christian Borntraeger <borntraeger@de.ibm.com>
Date: Fri Jul 25 15:50:04 2008 +0200
KVM: s390: Fix guest kconfig
Which changed the build process to build kvm_virtio.c only if CONFIG_S390_GUEST
is set. We must ifdef the prototype in the header file accordingly.
Reported-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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We got a stack overflow with a small stack configuration on a 32 bit
system. It just looks like as 4kb isn't enough and too dangerous.
So lets get rid of 4kb stacks on 32 bit.
But one thing I completely dislike about the call trace below is that
just for debugging or tracing purposes sprintf gets called (cio_start_key):
/* process condition code */
sprintf(dbf_txt, "ccode:%d", ccode);
CIO_TRACE_EVENT(4, dbf_txt);
But maybe its just me who thinks that this could be done better.
<4>Kernel stack overflow.
<4>Modules linked in: dm_multipath sunrpc bonding qeth_l2 dm_mod qeth ccwgroup vmur
<4>CPU: 1 Not tainted 2.6.27-30.x.20081015-s390default #1
<4>Process httpd (pid: 3807, task: 20ae2df8, ksp: 1666fb78)
<4>Krnl PSW : 040c0000 8027098a (number+0xe/0x348)
<4> R:0 T:1 IO:0 EX:0 Key:0 M:1 W:0 P:0 AS:0 CC:0 PM:0
<4>Krnl GPRS: 00d43318 0027097c 1666f277 9666f270
<4> 00000000 00000000 0000000a ffffffff
<4> 9666f270 1666f228 1666f277 1666f098
<4> 00000002 80270982 80271016 1666f098
<4>Krnl Code: 8027097e: f0340dd0a7f1 srp 3536(4,%r0),2033(%r10),4
<4> 80270984: 0f00 clcl %r0,%r0
<4> 80270986: a7840001 brc 8,80270988
<4> >8027098a: 18ef lr %r14,%r15
<4> 8027098c: a7faff68 ahi %r15,-152
<4> 80270990: 18bf lr %r11,%r15
<4> 80270992: 18a2 lr %r10,%r2
<4> 80270994: 1893 lr %r9,%r3
Modified calltrace with annotated stackframe size of each function:
stackframe size
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0 304 vsnprintf+850 [0x271016]
1 72 sprintf+74 [0x271522]
2 56 cio_start_key+262 [0x2d4c16]
3 56 ccw_device_start_key+222 [0x2dfe92]
4 56 ccw_device_start+40 [0x2dff28]
5 48 raw3215_start_io+104 [0x30b0f8]
6 56 raw3215_write+494 [0x30ba0a]
7 40 con3215_write+68 [0x30bafc]
8 40 __call_console_drivers+146 [0x12b0fa]
9 32 _call_console_drivers+102 [0x12b192]
10 64 release_console_sem+268 [0x12b614]
11 168 vprintk+462 [0x12bca6]
12 72 printk+68 [0x12bfd0]
13 256 __print_symbol+50 [0x15a882]
14 56 __show_trace+162 [0x103d06]
15 32 show_trace+224 [0x103e70]
16 48 show_stack+152 [0x103f20]
17 56 dump_stack+126 [0x104612]
18 96 __alloc_pages_internal+592 [0x175004]
19 80 cache_alloc_refill+776 [0x196f3c]
20 40 __kmalloc+258 [0x1972ae]
21 40 __alloc_skb+94 [0x328086]
22 32 pskb_copy+50 [0x328252]
23 32 skb_realloc_headroom+110 [0x328a72]
24 104 qeth_l2_hard_start_xmit+378 [0x7803bfde]
25 56 dev_hard_start_xmit+450 [0x32ef6e]
26 56 __qdisc_run+390 [0x3425d6]
27 48 dev_queue_xmit+410 [0x331e06]
28 40 ip_finish_output+308 [0x354ac8]
29 56 ip_output+218 [0x355b6e]
30 24 ip_local_out+56 [0x354584]
31 120 ip_queue_xmit+300 [0x355cec]
32 96 tcp_transmit_skb+812 [0x367da8]
33 40 tcp_push_one+158 [0x369fda]
34 112 tcp_sendmsg+852 [0x35d5a0]
35 240 sock_sendmsg+164 [0x32035c]
36 56 kernel_sendmsg+86 [0x32064a]
37 88 sock_no_sendpage+98 [0x322b22]
38 104 tcp_sendpage+70 [0x35cc1e]
39 48 sock_sendpage+74 [0x31eb66]
40 64 pipe_to_sendpage+102 [0x1c4b2e]
41 64 __splice_from_pipe+120 [0x1c5340]
42 72 splice_from_pipe+90 [0x1c57e6]
43 56 generic_splice_sendpage+38 [0x1c5832]
44 48 do_splice_from+104 [0x1c4c38]
45 48 direct_splice_actor+52 [0x1c4c88]
46 80 splice_direct_to_actor+180 [0x1c4f80]
47 72 do_splice_direct+70 [0x1c5112]
48 64 do_sendfile+360 [0x19de18]
49 72 sys_sendfile64+126 [0x19df32]
50 336 sysc_do_restart+18 [0x111a1a]
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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The current enable_sie code sets the mm->context.pgstes bit to tell
dup_mm that the new mm should have extended page tables. This bit is also
used by the s390 specific page table primitives to decide about the page
table layout - which means context.pgstes has two meanings. This can cause
any kind of bugs. For example - e.g. shrink_zone can call
ptep_clear_flush_young while enable_sie is running. ptep_clear_flush_young
will test for context.pgstes. Since enable_sie changed that value of the old
struct mm without changing the page table layout ptep_clear_flush_young will
do the wrong thing.
The solution is to split pgstes into two bits
- one for the allocation
- one for the current state
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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This patch series introduces a cgroup subsystem that utilizes the swsusp
freezer to freeze a group of tasks. It's immediately useful for batch job
management scripts. It should also be useful in the future for
implementing container checkpoint/restart.
The freezer subsystem in the container filesystem defines a cgroup file
named freezer.state. Reading freezer.state will return the current state
of the cgroup. Writing "FROZEN" to the state file will freeze all tasks
in the cgroup. Subsequently writing "RUNNING" will unfreeze the tasks in
the cgroup.
* 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 patch:
The first step in making the refrigerator() available to all
architectures, even for those without power management.
The purpose of such a change is to be able to use the refrigerator() in a
new control group subsystem which will implement a control group freezer.
[akpm@linux-foundation.org: fix sparc]
Signed-off-by: Cedric Le Goater <clg@fr.ibm.com>
Signed-off-by: Matt Helsley <matthltc@us.ibm.com>
Acked-by: Pavel Machek <pavel@suse.cz>
Acked-by: Serge E. Hallyn <serue@us.ibm.com>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Nigel Cunningham <nigel@tuxonice.net>
Tested-by: Matt Helsley <matthltc@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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The SET_PERSONALITY macro is always called with a second argument of 0.
Remove the ibcs argument and the various tests to set the PER_SVR4
personality.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Conflicts:
include/asm-x86/statfs.h
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This patch defines a dirty bit in the PGSTE that can be used to implement
dirty pages logging for KVM's live migration. The bit is set in the
ptep_rcp_copy function, which is called to save dirty and referenced information
from the storage key in the PGSTE. The bit can be tested and reset by KVM using
the kvm_s390_test_and_clear_page_dirty function that is introduced by this patch.
Acked-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Florian Funke <ffunke@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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EMC Symmetrix Subsystem Control I/O through CKD dasd requires a
specific parameter list sent to the array via a Perform Subsystem
Function CCW. The Symmetrix response is retrieved from the array
via a Read Subsystem Data CCW.
Signed-off-by: Nigel Hislop <hislop_nigel@emc.com>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Move cio's private simple udelay function to lib/delay.c and turn it
into something much more readable. So we have all implementations
at one place.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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* System call parameter and result access functions
* Add tracehook calls
* Split syscall_trace into two functions do_syscall_trace_enter and
do_syscall_trace_exit
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Add support for z10 HiperSockets multiwrite SBALs on output
queues. This is used on LPAR with EDDP enabled devices.
Signed-off-by: Klaus-Dieter Wacker <kdwacker@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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ext4 does not work on s390 because ext2_find_next_bit is broken. Fortunately
this function is only used by ext4. The function uses ffs which does not work
analog to ffz. The result of ffs has an offset of 1 which is not taken into
account. To fix this use the low level __ffs_word function directly instead
of the ill defined ffs.
In addition the patch improves find_next_zero_bit and ext2_find_next_zero_bit
by passing the bit offset into __ffz_word instead of adding it after the
function call returned.
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Rename KEXEC_CONTROL_CODE_SIZE to KEXEC_CONTROL_PAGE_SIZE, because control
page is used for not only code on some platform. For example in kexec
jump, it is used for data and stack too.
[akpm@linux-foundation.org: unbreak powerpc and arm, finish conversion]
Signed-off-by: Huang Ying <ying.huang@intel.com>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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