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s390: rescue initrd as early as possible

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To avoid multi-stage initrd rescue operation and to simplify
assumptions during early memory allocations move initrd at some final
safe destination as early as possible. This would also allow us to
drop .bss usage restrictions for some files.

Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Vasily Gorbik
2018-04-11 11:56:55 +02:00
committed by Martin Schwidefsky
parent 3b076dca14
commit 15426ca43d
5 changed files with 41 additions and 39 deletions
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22
arch/s390/kernel/early_nobss.c
View File

@@ -13,7 +13,6 @@
#include <linux/string.h>
#include <asm/sections.h>
#include <asm/lowcore.h>
#include <asm/setup.h>
#include <asm/timex.h>
#include "entry.h"
@@ -32,26 +31,6 @@ static void __init reset_tod_clock(void)
S390_lowcore.last_update_clock = TOD_UNIX_EPOCH;
}
static void __init rescue_initrd(void)
{
unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20);
/*
* Just like in case of IPL from VM reader we make sure there is a
* gap of 4MB between end of kernel and start of initrd.
* That way we can also be sure that saving an NSS will succeed,
* which however only requires different segments.
*/
if (!IS_ENABLED(CONFIG_BLK_DEV_INITRD))
return;
if (!INITRD_START || !INITRD_SIZE)
return;
if (INITRD_START >= min_initrd_addr)
return;
memmove((void *) min_initrd_addr, (void *) INITRD_START, INITRD_SIZE);
INITRD_START = min_initrd_addr;
}
static void __init clear_bss_section(void)
{
memset(__bss_start, 0, __bss_stop - __bss_start);
@@ -60,6 +39,5 @@ static void __init clear_bss_section(void)
void __init startup_init_nobss(void)
{
reset_tod_clock();
rescue_initrd();
clear_bss_section();
}

1
arch/s390/kernel/vmlinux.lds.S
View File

@@ -154,6 +154,7 @@ SECTIONS
QUAD(_stext) /* default_lma */
QUAD(startup_continue) /* entry */
QUAD(__bss_start - _stext) /* image_size */
QUAD(__bss_stop - __bss_start) /* bss_size */
}
/* Debugging sections. */