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s390: make command line configurable

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Allow to configure the command line to an arbitrary length, with a
default of 4096 bytes. Also remove COMMAND_LINE_SIZE from
include/uapi/asm/setup.h as this is dynamic now and doesn't tell
anything about the command line size limitations of a new kernel
that might be loaded.

Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Sven Schnelle 2021-09-29 09:09:34 +02:00 committed by Vasily Gorbik
parent 5ecb2da660
commit 622021cd6c
3 changed files with 9 additions and 11 deletions
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8
arch/s390/Kconfig
View File

@ -438,6 +438,14 @@ endchoice
config 64BIT
def_bool y
config COMMAND_LINE_SIZE
int "Maximum size of kernel command line"
default 4096
range 896 1048576
help
This allows you to specify the maximum length of the kernel command
line.
config COMPAT
def_bool y
prompt "Kernel support for 31 bit emulation"

1
arch/s390/include/asm/setup.h
View File

@ -12,6 +12,7 @@
#define PARMAREA 0x10400
#define COMMAND_LINE_SIZE CONFIG_COMMAND_LINE_SIZE
/*
* Machine features detected in early.c
*/

11
arch/s390/include/uapi/asm/setup.h
View File

@ -1,12 +1 @@
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* S390 version
* Copyright IBM Corp. 1999, 2010
*/
#ifndef _UAPI_ASM_S390_SETUP_H
#define _UAPI_ASM_S390_SETUP_H
#define COMMAND_LINE_SIZE 4096
#endif /* _UAPI_ASM_S390_SETUP_H */