linux.git/arch/s390/kernel, branch v5.9

s390: add 3f program exception handler

2020-09-14T08:08:07+00:00

Program exception 3f (secure storage violation) can only be detected
when the CPU is running in SIE with a format 4 state description,
e.g. running a protected guest. Because of this and because user
space partly controls the guest memory mapping and can trigger this
exception, we want to send a SIGSEGV to the process running the guest
and not panic the kernel.

Signed-off-by: Janosch Frank 
Cc:  # 5.7
Fixes: 084ea4d611a3 ("s390/mm: add (non)secure page access exceptions handlers")
Reviewed-by: Claudio Imbrenda 
Reviewed-by: Cornelia Huck 
Acked-by: Christian Borntraeger 
Signed-off-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik

s390/init: add missing __init annotations

2020-09-14T08:08:07+00:00

Add __init to reserve_memory_end, reserve_oldmem and remove_oldmem.
Sometimes these functions are not inlined, and then the build
complains about section mismatch.

Signed-off-by: Ilya Leoshkevich 
Signed-off-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik

s390/idle: fix suspicious RCU usage

2020-09-14T08:08:07+00:00

After commit eb1f00237aca ("lockdep,trace: Expose tracepoints") the
lock tracepoints are visible to lockdep and RCU-lockdep is finding a
bunch more RCU violations that were previously hidden.

Switch the idle->seqcount over to using raw_write_*() to avoid the
lockdep annotation and thus the lock tracepoints.

Reported-by: Guenter Roeck 
Signed-off-by: Peter Zijlstra (Intel) 
Signed-off-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik

cpuidle: Move trace_cpu_idle() into generic code

2020-08-26T10:41:54+00:00

Remove trace_cpu_idle() from the arch_cpu_idle() implementations and
put it in the generic code, right before disabling RCU. Gets rid of
more trace_*_rcuidle() users.

Signed-off-by: Peter Zijlstra (Intel) 
Reviewed-by: Steven Rostedt (VMware) 
Reviewed-by: Thomas Gleixner 
Acked-by: Rafael J. Wysocki 
Tested-by: Marco Elver 
Link: https://lkml.kernel.org/r/20200821085348.428433395@infradead.org

s390/ptrace: fix storage key handling

2020-08-17T11:17:14+00:00

The key member of the runtime instrumentation control block contains
only the access key, not the complete storage key. Therefore the value
must be shifted by four bits. Since existing user space does not
necessarily query and set the access key correctly, just ignore the
user space provided key and use the correct one.
Note: this is only relevant for debugging purposes in case somebody
compiles a kernel with a default storage access key set to a value not
equal to zero.

Fixes: 262832bc5acd ("s390/ptrace: add runtime instrumention register get/set")
Reported-by: Claudio Imbrenda 
Signed-off-by: Heiko Carstens

s390/runtime_instrumentation: fix storage key handling

2020-08-17T11:17:10+00:00

The key member of the runtime instrumentation control block contains
only the access key, not the complete storage key. Therefore the value
must be shifted by four bits.
Note: this is only relevant for debugging purposes in case somebody
compiles a kernel with a default storage access key set to a value not
equal to zero.

Fixes: e4b8b3f33fca ("s390: add support for runtime instrumentation")
Reported-by: Claudio Imbrenda 
Signed-off-by: Heiko Carstens

all arch: remove system call sys_sysctl

2020-08-15T02:56:56+00:00

Since commit 61a47c1ad3a4dc ("sysctl: Remove the sysctl system call"),
sys_sysctl is actually unavailable: any input can only return an error.

We have been warning about people using the sysctl system call for years
and believe there are no more users.  Even if there are users of this
interface if they have not complained or fixed their code by now they
probably are not going to, so there is no point in warning them any
longer.

So completely remove sys_sysctl on all architectures.

[nixiaoming@huawei.com: s390: fix build error for sys_call_table_emu]
 Link: http://lkml.kernel.org/r/20200618141426.16884-1-nixiaoming@huawei.com

Signed-off-by: Xiaoming Ni 
Signed-off-by: Andrew Morton 
Acked-by: Will Deacon 		[arm/arm64]
Acked-by: "Eric W. Biederman" 
Cc: Aleksa Sarai 
Cc: Alexander Shishkin 
Cc: Al Viro 
Cc: Andi Kleen 
Cc: Andrew Morton 
Cc: Andy Lutomirski 
Cc: Arnaldo Carvalho de Melo 
Cc: Arnd Bergmann 
Cc: Benjamin Herrenschmidt 
Cc: Bin Meng 
Cc: Borislav Petkov 
Cc: Brian Gerst 
Cc: Catalin Marinas 
Cc: chenzefeng 
Cc: Christian Borntraeger 
Cc: Christian Brauner 
Cc: Chris Zankel 
Cc: David Howells 
Cc: David S. Miller 
Cc: Diego Elio Pettenò 
Cc: Dmitry Vyukov 
Cc: Dominik Brodowski 
Cc: Fenghua Yu 
Cc: Geert Uytterhoeven 
Cc: Heiko Carstens 
Cc: Helge Deller 
Cc: "H. Peter Anvin" 
Cc: Ingo Molnar 
Cc: Iurii Zaikin 
Cc: Ivan Kokshaysky 
Cc: James Bottomley 
Cc: Jens Axboe 
Cc: Jiri Olsa 
Cc: Kars de Jong 
Cc: Kees Cook 
Cc: Krzysztof Kozlowski 
Cc: Luis Chamberlain 
Cc: Marco Elver 
Cc: Mark Rutland 
Cc: Martin K. Petersen 
Cc: Masahiro Yamada 
Cc: Matt Turner 
Cc: Max Filippov 
Cc: Michael Ellerman 
Cc: Michal Simek 
Cc: Miklos Szeredi 
Cc: Minchan Kim 
Cc: Namhyung Kim 
Cc: Naveen N. Rao 
Cc: Nick Piggin 
Cc: Oleg Nesterov 
Cc: Olof Johansson 
Cc: Paul Burton 
Cc: "Paul E. McKenney" 
Cc: Paul Mackerras 
Cc: Peter Zijlstra (Intel) 
Cc: Randy Dunlap 
Cc: Ravi Bangoria 
Cc: Richard Henderson 
Cc: Rich Felker 
Cc: Russell King 
Cc: Sami Tolvanen 
Cc: Sargun Dhillon 
Cc: Stephen Rothwell 
Cc: Sudeep Holla 
Cc: Sven Schnelle 
Cc: Thiago Jung Bauermann 
Cc: Thomas Bogendoerfer 
Cc: Thomas Gleixner 
Cc: Tony Luck 
Cc: Vasily Gorbik 
Cc: Vlastimil Babka 
Cc: Yoshinori Sato 
Cc: Zhou Yanjie 
Link: http://lkml.kernel.org/r/20200616030734.87257-1-nixiaoming@huawei.com
Signed-off-by: Linus Torvalds

s390/numa: move code to arch/s390/kernel

2020-08-11T16:16:55+00:00

Move all code from arch/s390/numa/ to arch/s390/kernel/
since numa.c is the only source file and all others were
deleted with the fake NUMA support removal.

Signed-off-by: Alexander Gordeev 
Signed-off-by: Heiko Carstens

s390/debug: debug feature version 3

2020-08-11T16:16:43+00:00

Change __debug_entry structure in the following way:
 - remove redundant union
 - Field containing cpuid is expanded to 16 bits. 8-bit width was not
   enough since we already support up to 512 cpus.
 - Field containing the timestamp is expanded to 60 bits. The timestamp
   itself is now stored in the absolute Unix time format in microseconds
   taking the Epoch Index into acount.
Adjust default header for debug entries by setting minimum width for cpuid
to 4 digits.

Reviewed-by: Heiko Carstens 
Signed-off-by: Mikhail Zaslonko 
Signed-off-by: Heiko Carstens

Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2020-08-09T20:33:54+00:00

Pull regset conversion fix from Al Viro:
 "Fix a regression from an unnoticed bisect hazard in the regset series.

  A bunch of old (aout, originally) primitives used by coredumps became
  dead code after fdpic conversion to regsets. Removal of that dead code
  had been the first commit in the followups to regset series;
  unfortunately, it happened to hide the bisect hazard on sh (extern for
  fpregs_get() had not been updated in the main series when it should
  have been; followup simply made fpregs_get() static). And without that
  followup commit this bisect hazard became breakage in the mainline"

Tested-by: John Paul Adrian Glaubitz 

* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  kill unused dump_fpu() instances