linux.git/arch/s390/kernel/Makefile, branch v5.5

s390: remove compat vdso code

2019-12-01T11:48:49+00:00

Remove compat vdso code, since there is hardly any compat user space
left. Still existing compat user space will have to use system calls
instead.

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

s390: clean .bss before running uncompressed kernel

2019-08-21T10:58:52+00:00

Clean uncompressed kernel .bss section in the startup code before
the uncompressed kernel is executed. At this point of time initrd and
certificates have been already rescued. Uncompressed kernel .bss size
is known from vmlinux_info. It is also taken into consideration during
uncompressed kernel positioning by kaslr (so it is safe to clean it).

With that uncompressed kernel is starting with .bss section zeroed and
no .bss section usage restrictions apply. Which makes chkbss checks for
uncompressed kernel objects obsolete and they can be removed.

early_nobss.c is also not needed anymore. Parts of it which are still
relevant are moved to early.c. Kasan initialization code is now called
directly from head64 (early.c is instrumented and should not be
executed before kasan shadow memory is set up).

Reviewed-by: Philipp Rudo 
Signed-off-by: Vasily Gorbik

s390: enforce CONFIG_SMP

2019-06-07T08:09:37+00:00

There never have been distributions that shiped with CONFIG_SMP=n for
s390. In addition the kernel currently doesn't even compile with
CONFIG_SMP=n for s390. Most likely it wouldn't even work, even if we
fix the compile error, since nobody tests it, since there is no use
case that I can think of.
Therefore simply enforce CONFIG_SMP and get rid of some more or
less unused code.

Reviewed-by: Christian Borntraeger 
Signed-off-by: Heiko Carstens

s390/unwind: introduce stack unwind API

2019-05-02T11:54:11+00:00

Rework the dump_trace() stack unwinder interface to support different
unwinding algorithms. The new interface looks like this:

	struct unwind_state state;
	unwind_for_each_frame(&state, task, regs, start_stack)
		do_something(state.sp, state.ip, state.reliable);

The unwind_bc.c file contains the implementation for the classic
back-chain unwinder.

One positive side effect of the new code is it now handles ftraced
functions gracefully. It prints the real name of the return function
instead of 'return_to_handler'.

Signed-off-by: Martin Schwidefsky

s390/kernel: build a relocatable kernel

2019-04-29T08:47:10+00:00

This patch adds support for building a relocatable kernel with -fPIE.
The kernel will be relocated to 0 early in the boot process.

Signed-off-by: Gerald Schaefer 
Reviewed-by: Philipp Rudo 
Signed-off-by: Martin Schwidefsky

s390/kexec_file: Disable kexec_load when IPLed secure

2019-04-29T08:44:03+00:00

A kernel loaded via kexec_load cannot be verified. Thus disable kexec_load
systemcall in kernels which where IPLed securely. Use the IMA mechanism to
do so.

Signed-off-by: Philipp Rudo 
Signed-off-by: Martin Schwidefsky

s390: don't build vdso32 with clang

2019-04-11T11:36:49+00:00

clang does not support 31 bit object files on s390, so skip
the 32-bit vdso here, and only build it when using gcc to compile
the kernel.

Signed-off-by: Arnd Bergmann 
Signed-off-by: Martin Schwidefsky

s390/cpum_cf_diag: Add support for s390 counter facility diagnostic trace

2019-02-22T08:19:56+00:00

Introduce a PMU device named cpum_cf_diag. It extracts the
values of all counters in all authorized counter sets and stores
them as event raw data. This is done with the STORE CPU COUNTER
MULTIPLE instruction to speed up access. All counter sets
fit into one buffer. The values of each counter are taken
when the event is started on the performance sub-system and when
the event is stopped.
This results in counter values available at the start and
at the end of the measurement time frame. The difference is
calculated for each counter. The differences of all
counters are then saved as event raw data in the perf.data
file.

The counter values are accompanied by the time stamps
when the counter set was started and when the counter set
was stopped. This data is part of a trailer entry which
describes the time frame, counter set version numbers,
CPU speed, and machine type for later analysis.

Signed-off-by: Thomas Richter 
Reviewed-by: Hendrik Brueckner 
Signed-off-by: Martin Schwidefsky

s390/cpum_cf: move common functions into a separate file

2019-02-22T08:19:55+00:00

Move common functions of the couter facility support into a separate
file.

Signed-off-by: Hendrik Brueckner 
Signed-off-by: Martin Schwidefsky

s390: remove compat_wrapper.c

2019-01-18T08:33:20+00:00

Now that all these wrappers are automatically generated, we can
remove the entire file, and instead point to the regualar syscalls
like all other architectures do.

The 31-bit pointer extension is now handled in the __s390_sys_*()
wrappers.

Link: https://lore.kernel.org/lkml/20190116131527.2071570-6-arnd@arndb.de
Signed-off-by: Arnd Bergmann 
Reviewed-by: Heiko Carstens 
Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky