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Date: Thu, 20 Feb 2014 09:38:16 +0100
From: Heiko Carstens <heiko.carstens@...ibm.com>
To: Sudeep Holla <sudeep.holla@....com>
Cc: linux-kernel@...r.kernel.org,
Martin Schwidefsky <schwidefsky@...ibm.com>,
linux390@...ibm.com, linux-s390@...r.kernel.org
Subject: Re: [PATCH RFC/RFT v3 4/9] s390: move cacheinfo sysfs to generic
cacheinfo infrastructure
On Wed, Feb 19, 2014 at 04:06:11PM +0000, Sudeep Holla wrote:
> From: Sudeep Holla <sudeep.holla@....com>
>
> This patch removes the redundant sysfs cacheinfo code by making use of
> the newly introduced generic cacheinfo infrastructure.
>
> Signed-off-by: Sudeep Holla <sudeep.holla@....com>
> Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
> Cc: Heiko Carstens <heiko.carstens@...ibm.com>
> Cc: linux390@...ibm.com
> Cc: linux-s390@...r.kernel.org
> ---
> arch/s390/kernel/cache.c | 388 ++++++++++++-----------------------------------
> 1 file changed, 93 insertions(+), 295 deletions(-)
(FWIW, if you send an update of your series, please cc me on all patches, so I
don't have to search LKML for the rest of the patch set)
I gave your patches series a test and I get this nice message on boot:
io scheduler cfq registered
DEBUG_LOCKS_WARN_ON(irqs_disabled_flags(flags))
------------[ cut here ]------------
WARNING: at kernel/locking/lockdep.c:2742
Modules linked in:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.14.0-rc3-00177-g468cee08c2ea #7
task: 0000000000adcc60 ti: 0000000000ac4000 task.ti: 0000000000ac4000
Krnl PSW : 0404c00180000000 000000000019af3e (lockdep_trace_alloc+0x116/0x120)
R:0 T:1 IO:0 EX:0 Key:0 M:1 W:0 P:0 AS:3 CC:0 PM:0 EA:3
Krnl GPRS: 0000000000000020 0000000000adcc60 000000000000002f 0000000000000000
000000000019af3a 0000000000000000 0000000000000001 0000000000000000
000000003ff26140 000000000055fb92 00000000000001b0 00000000000080d0
0400000000000000 00000000000080d0 000000000019af3a 000000000001bc30
Krnl Code: 000000000019af2e: c020003b1e34 larl %r2,8feb96
000000000019af34: c0e5002e0304 brasl %r14,75b53c
#000000000019af3a: a7f40001 brc 15,19af3c
>000000000019af3e: e32003100004 lg %r2,784
000000000019af44: a7f4ff9f brc 15,19ae82
000000000019af48: e31003100004 lg %r1,784
000000000019af4e: e32013f00150 sty %r2,5104(%r1)
000000000019af54: 07fe bcr 15,%r14
Call Trace:
([<000000000019af3a>] lockdep_trace_alloc+0x112/0x120)
[<000000000027a7d2>] __kmalloc+0x5a/0x204
[<000000000055fb92>] detect_cache_attributes+0x66/0xd4
[<000000000055fc2e>] _detect_cache_attributes+0x2e/0x3c
[<00000000001ce7a2>] generic_smp_call_function_single_interrupt+0x9a/0xe8
[<000000000010b462>] do_ext_interrupt+0x12a/0x24c
[<00000000001afab0>] handle_irq_event_percpu+0x70/0x240
[<00000000001b3218>] handle_percpu_irq+0x6c/0x98
[<00000000001af16e>] generic_handle_irq+0x46/0x68
[<000000000010b6c2>] do_IRQ+0x5e/0x84
[<0000000000768b06>] ext_skip+0x44/0x4a
[<000000000076827c>] vtime_stop_cpu+0x50/0xa4
([<0000000000768262>] vtime_stop_cpu+0x36/0xa4)
[<0000000000103848>] arch_cpu_idle+0x6c/0xbc
[<00000000001af032>] cpu_startup_entry+0x146/0x218
[<0000000000b64932>] start_kernel+0x3fa/0x408
[<0000000000100020>] _stext+0x20/0x80
INFO: lockdep is turned off.
Last Breaking-Event-Address:
[<000000000019af3a>] lockdep_trace_alloc+0x112/0x120
---[ end trace 9c0011ccc7b324d6 ]---
brd: module loaded
In addition /proc/cpuinfo is now incorrect.
With your patches it looks like this:
[root@...45007 ~]# cat /proc/cpuinfo
vendor_id : IBM/S390
# processors : 4
bogomips per cpu: 18115.00
features : esan3 zarch stfle msa ldisp eimm dfp etf3eh highgprs
cache0 : level=1 type=Data scope=Shared size=96K line_size=256 associativity=6
cache1 : level=1 type=Data scope=Shared size=96K line_size=256 associativity=6
cache2 : level=1 type=Data scope=Shared size=96K line_size=256 associativity=6
cache3 : level=1 type=Data scope=Shared size=96K line_size=256 associativity=6
cache4 : level=1 type=Data scope=Shared size=96K line_size=256 associativity=6
cache5 : level=1 type=Data scope=Shared size=96K line_size=256 associativity=6
processor 0: version = FF, identification = 2F6D15, machine = 2827
processor 1: version = FF, identification = 2F6D15, machine = 2827
processor 2: version = FF, identification = 2F6D15, machine = 2827
processor 3: version = FF, identification = 2F6D15, machine = 2827
However it is supposed to look like this:
[root@...45007 ~]# cat /proc/cpuinfo
vendor_id : IBM/S390
# processors : 4
bogomips per cpu: 18115.00
features : esan3 zarch stfle msa ldisp eimm dfp etf3eh highgprs
cache0 : level=1 type=Data scope=Private size=96K line_size=256 associativity=6
cache1 : level=1 type=Instruction scope=Private size=64K line_size=256 associativity=4
cache2 : level=2 type=Data scope=Private size=1024K line_size=256 associativity=8
cache3 : level=2 type=Instruction scope=Private size=1024K line_size=256 associativity=8
cache4 : level=3 type=Unified scope=Shared size=49152K line_size=256 associativity=12
cache5 : level=4 type=Unified scope=Shared size=393216K line_size=256 associativity=24
processor 0: version = FF, identification = 2F6D15, machine = 2827
processor 1: version = FF, identification = 2F6D15, machine = 2827
processor 2: version = FF, identification = 2F6D15, machine = 2827
processor 3: version = FF, identification = 2F6D15, machine = 2827
The sysfs files and it contents seem to be ok.
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