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s390/alternatives: Remove noaltinstr option

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The current Kernel doesn't boot without alternative patching on
z16 machines. To avoid such bugs in the future, remove the option
disable alternative patching.

Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Sven Schnelle 2024-07-16 13:50:48 +02:00 committed by Vasily Gorbik
parent d3604ffba1
commit 035248a784
2 changed files with 2 additions and 22 deletions
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3
Documentation/admin-guide/kernel-parameters.txt
View File

@ -3830,9 +3830,6 @@
noalign [KNL,ARM]
noaltinstr [S390,EARLY] Disables alternative instructions
patching (CPU alternatives feature).
noapic [SMP,APIC,EARLY] Tells the kernel to not make use of any
IOAPICs that may be present in the system.

21
arch/s390/kernel/alternative.c
View File

@ -7,18 +7,8 @@
#include <asm/facility.h>
#include <asm/nospec-branch.h>
static int __initdata_or_module alt_instr_disabled;
static int __init disable_alternative_instructions(char *str)
{
alt_instr_disabled = 1;
return 0;
}
early_param("noaltinstr", disable_alternative_instructions);
static void __init_or_module __apply_alternatives(struct alt_instr *start,
struct alt_instr *end)
void __init_or_module apply_alternatives(struct alt_instr *start,
struct alt_instr *end)
{
struct alt_instr *a;
u8 *instr, *replacement;
@ -37,13 +27,6 @@ static void __init_or_module __apply_alternatives(struct alt_instr *start,
}
}
void __init_or_module apply_alternatives(struct alt_instr *start,
struct alt_instr *end)
{
if (!alt_instr_disabled)
__apply_alternatives(start, end);
}
extern struct alt_instr __alt_instructions[], __alt_instructions_end[];
void __init apply_alternative_instructions(void)
{