AuxXxilium/linux_dsm_epyc7002
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[S390] Remove initial kernel stack backchain initialization.

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Early init code clears the backchain of the initial kernel stack frame.
This is not necessary since it is pre initialized with zeros. Plus it
was broken on 64 bit since it cleared only four of eight bytes.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2008-12-25 13:39:21 +01:00 committed by Martin Schwidefsky
parent 64253acbf1
commit c58d92b233
2 changed files with 0 additions and 2 deletions
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1
arch/s390/kernel/head31.S
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@ -29,7 +29,6 @@ startup_continue:
ahi %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union+THREAD_SIZE ahi %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union+THREAD_SIZE
st %r15,__LC_KERNEL_STACK # set end of kernel stack st %r15,__LC_KERNEL_STACK # set end of kernel stack
ahi %r15,-96 ahi %r15,-96
xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear backchain
# #
# Save ipl parameters, clear bss memory, initialize storage key for kernel pages, # Save ipl parameters, clear bss memory, initialize storage key for kernel pages,
# and create a kernel NSS if the SAVESYS= parm is defined # and create a kernel NSS if the SAVESYS= parm is defined

1
arch/s390/kernel/head64.S
View File

@ -96,7 +96,6 @@ startup_continue:
aghi %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union + THREAD_SIZE aghi %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union + THREAD_SIZE
stg %r15,__LC_KERNEL_STACK # set end of kernel stack stg %r15,__LC_KERNEL_STACK # set end of kernel stack
aghi %r15,-160 aghi %r15,-160
xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear backchain
# #
# Save ipl parameters, clear bss memory, initialize storage key for kernel pages, # Save ipl parameters, clear bss memory, initialize storage key for kernel pages,
# and create a kernel NSS if the SAVESYS= parm is defined # and create a kernel NSS if the SAVESYS= parm is defined