linux.git/arch/s390/boot, branch v4.18

s390/boot: remove unused COMPILE_VERSION and ccflags-y

2018-04-16T07:10:24+00:00

ccflags-y has no effect (no code is built in that directory,
arch/s390/boot/compressed/Makefile defines its own KBUILD_CFLAGS).
Removing ccflags-y together with COMPILE_VERSION.

Reviewed-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik 
Signed-off-by: Martin Schwidefsky

s390/decompressor: Ignore file vmlinux.bin.full

2018-04-16T07:10:23+00:00

Commit 81796a3c6a4a ("s390/decompressor: trim uncompressed
image head during the build") introduced a new
file named vmlinux.bin.full in directory
arch/s390/boot/compressed.

Add this file to the list of ignored files so it does
not show up on git status.

Signed-off-by: Thomas Richter 
Signed-off-by: Martin Schwidefsky

s390/ipl: rely on diag308 store to get ipl info

2018-04-10T05:38:59+00:00

For both ccw and fcp boot retrieve ipl info from ipl block received via
diag308 store. Old scsi ipl parm block handling and cio_get_iplinfo are
removed. Ipl type is deducted from ipl block (if valid).

Reviewed-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik 
Signed-off-by: Martin Schwidefsky

s390/decompressor: trim uncompressed image head during the build

2018-03-19T06:02:07+00:00

It seems to be suboptimal to compress the entire image, so that we
could decompress and throw away the first 68k (0x11000) during the boot
process. This patch trims 0x11000 bytes during the build process and
adjusts symbols in size.h accordingly.

Besides making bzImage smaller, this change would also be a benefit
for kaslr. It allows to decompress the kernel right to desired offset,
without worrying about dead weight in front of the decompressed image.

Signed-off-by: Vasily Gorbik 
Acked-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

s390: unify linker symbols usage

2018-02-27T07:05:23+00:00

Common code defines linker symbols which denote sections start/end in
a form of char []. Referencing those symbols as _symbol or &_symbol
yields the same result, but "_symbol" form is more widespread across
newly written code. Convert s390 specific code to this style.

Also removes unused _text symbol definition in boot/compressed/misc.c.

Signed-off-by: Vasily Gorbik 
Acked-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

s390/decompressor: discard __ex_table section

2018-02-27T07:05:21+00:00

Exception table (__ex_table section) is not used during the decompressor
phase and could be discarded to save the memory. It is currently
generated due to sclp_service_call function (sclp_early_core.c). An
assumption is that decompressor usage of sclp_service_call via
sclp_early_printk should never trigger exceptions.

Signed-off-by: Vasily Gorbik 
Acked-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

s390/decompressor: discard __ksymtab and .eh_frame sections

2018-01-23T06:36:54+00:00

__ksymtab sections created for exported symbols are not needed
during the decompressor phase and could be discarded to save the memory.
The source of those exports is ebcdic.o, which is linked into both
vmlinux and boot/compressed/vmlinux.

.eh_frame section is also unused and could be discarded from
boot/compressed/vmlinux. The same has been done for vmlinux in:
"s390/kernel: emit CFI data in .debug_frame and discard .eh_frame
sections".

Signed-off-by: Vasily Gorbik 
Reviewed-by: Hendrik Brueckner 
Signed-off-by: Martin Schwidefsky

s390/decompressor: swap .text and .rodata.compressed sections

2018-01-23T06:36:49+00:00

.rodata.compressed section contains compressed linux image and is
quite large. By swapping text and rodata.compressed sections, the
decompressor code ends up between 0x11000 and 0x100000 addresses,
which makes it easier:
- to distinguish the decompressor phase from decompressed code (which
lives above 0x100000, except for small startup_continue),
- define break points which don't intersect with the main kernel image
later.

Signed-off-by: Vasily Gorbik 
Signed-off-by: Martin Schwidefsky

s390: add a few more SPDX identifiers

2017-12-05T06:51:09+00:00

Add the correct SPDX license to a few more files under arch/s390 and
drivers/s390 which have been missed to far.
The SPDX identifier is a legally binding shorthand, which can be used
instead of the full boiler plate text.

Signed-off-by: Martin Schwidefsky

s390: Remove redundant license text

2017-11-24T14:37:24+00:00

Now that the SPDX tag is in all arch/s390/ files, that identifies the
license in a specific and legally-defined manner.  So the extra GPL text
wording in the remaining files can be removed as it is no longer needed
at all.

This is done on a quest to remove the 700+ different ways that files in
the kernel describe the GPL license text.  And there's unneeded stuff
like the address (sometimes incorrect) for the FSF which is never
needed.

No copyright headers or other non-license-description text was removed.

Cc: Martin Schwidefsky 
Cc: Heiko Carstens 
Cc: "Paul E. McKenney" 
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Martin Schwidefsky