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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
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@ -438,6 +438,14 @@ endchoice
config 64BIT config 64BIT
def_bool y 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 config COMPAT
def_bool y def_bool y
prompt "Kernel support for 31 bit emulation" prompt "Kernel support for 31 bit emulation"

1
arch/s390/include/asm/setup.h
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@ -12,6 +12,7 @@
#define PARMAREA 0x10400 #define PARMAREA 0x10400
#define COMMAND_LINE_SIZE CONFIG_COMMAND_LINE_SIZE
/* /*
* Machine features detected in early.c * 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 */ /* 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 */