linux-toradex.git/arch/s390/kernel/processor.c, branch v3.4.2

[S390] avoid warning in show_cpuinfo

2011-10-30T14:16:15+00:00

The .start function and indirectly the .next function of the show_cpuinfo
sequential operation uses NR_CPUS as limit instead of nr_cpu_ids.
This can cause warnings like this:

WARNING: at /usr/src/linux/include/linux/cpumask.h:107
Process lscpu (pid: 575, task: 000000007deb4338, ksp: 000000007794f588)
Krnl PSW : 0704000180000000 0000000000106db4 (show_cpuinfo+0x108/0x234)
           R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:0 CC:0 PM:0 EA:3
Krnl GPRS: 0000000000000003 0000000000791988 000000000071b478 0000000000000004
           0000000000000001 0000000000000000 000000007d139500 0000000000000400
           0000000000000000 000000000070e24c 000000007d48d600 0000000000000005
           000000007d48d600 00000000004dfa10 0000000000106cf8 000000007794fcc0
Krnl Code: 0000000000106da8: 95001000           cli     0(%r1),0
           0000000000106dac: a774ffac           brc     7,106d04
           0000000000106db0: a7f40001           brc     15,106db2
          >0000000000106db4: 92011000           mvi     0(%r1),1
           0000000000106db8: a7f4ffa6           brc     15,106d04
           0000000000106dbc: c0e5000065b4       brasl   %r14,113924
           0000000000106dc2: c09000303a45       larl    %r9,70e24c
           0000000000106dc8: c020001eefd4       larl    %r2,4e4d70

Replacing NR_CPUS with nr_cpu_ids fixes it.

Signed-off-by: Martin Schwidefsky

[S390] prevent unneccesary loops_per_jiffy recalculation

2011-01-05T11:47:32+00:00

When the seqfile /proc/cpuinfo gets accesses for each possible cpu
loops_per_jiffy gets recalculated. However its value is only needed
on first access.
In addition loops_per_jiffy should be recalculated when the machine
reports a capability change.

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

[S390] cpuinfo: use get_online_cpus() instead of preempt_disable()

2011-01-05T11:47:31+00:00

Use get_online_cpus() instead of preempt_disable() to make sure cpus
don't go offline while accessing their per cpu data.
The preempt_disable() stuff is old code which was used before
get_online_cpus() was available.

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

[S390] smp: remove cpu hotplug messages

2011-01-05T11:47:31+00:00

Get rid of messages that indicate if a cpu went online or offline.
There is nothing special about this anymore and these messages might
flood the kernel log buffer which makes debugging harder since more
important messages might be overwritten.

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

[S390] smp: use correct cpu address in print_cpu_info()

2010-10-25T14:10:20+00:00

Up to now print_cpu_info() uses the cpu address stored in it's local
lowcore to print a message to the console. The cpu address in the
lowcore is (in this case) however not the physical cpu address of the
local cpu. It's the address of the cpu that issued the sigp restart
which started the local cpu.
Fix this by using the store cpu address instruction instead.
It's not that anybody really cares since this is broken since more than
ten years...

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

[S390] More cleanup for struct _lowcore

2010-05-17T08:00:15+00:00

Remove cpu_id from lowcore and replace addr_t with __u64.

Signed-off-by: Martin Schwidefsky

[S390] Add highgprs facility to /proc/cpuinfo

2009-10-14T10:43:53+00:00

This patch makes the hwcap bit for the high gprs feature to be visible
in /proc/cpuinfo.

Signed-off-by: Andreas Krebbel 
Signed-off-by: Martin Schwidefsky

[S390] Add hwcap flag for the etf3 enhancement facility

2009-03-26T14:24:32+00:00

The Extended Translation Facility 3 (ETF3) added instructions which
allow conversions between different unicode character maps (UTF-8,
UTF-32 ...).  These instructions got enhanced with a later version of
the ETF3 allowing malformed multibyte chars to be recognized and
reported correctly.  The attached patch reserves bit 8 in the elf
hwcaps vector for the enhanced version of ETF3. The bit corresponds to
the stfle bits 22 and 30 and will only be set if both of the stfle
bits are set.

Signed-off-by: Andreas Krebbel 
Signed-off-by: Martin Schwidefsky

[S390] eliminate cpuinfo_S390 structure

2009-03-26T14:24:26+00:00

Signed-off-by: Martin Schwidefsky

[S390] convert cpu related printks to pr_xxx macros.

2008-12-25T12:39:25+00:00

Signed-off-by: Martin Schwidefsky