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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2008-12-25 13:39:21 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2008-12-25 13:39:13 +0100 |
| commit | c58d92b233a41b81fbbea6add4ba1b512784f837 (patch) | |
| tree | 3c2aff73fa9f4fe21901969eb2ea8f67e22670a4 /arch/s390 | |
| parent | 64253acbf189085fb0ceb9a3fbe43b40f4a0a932 (diff) | |
| download | linux-c58d92b233a41b81fbbea6add4ba1b512784f837.tar.gz linux-c58d92b233a41b81fbbea6add4ba1b512784f837.tar.bz2 linux-c58d92b233a41b81fbbea6add4ba1b512784f837.zip | |
[S390] Remove initial kernel stack backchain initialization.
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>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/kernel/head31.S | 1 | ||||
| -rw-r--r-- | arch/s390/kernel/head64.S | 1 |
2 files changed, 0 insertions, 2 deletions
diff --git a/arch/s390/kernel/head31.S b/arch/s390/kernel/head31.S index 7add8454773b..db476d114caa 100644 --- a/arch/s390/kernel/head31.S +++ b/arch/s390/kernel/head31.S @@ -29,7 +29,6 @@ startup_continue: ahi %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union+THREAD_SIZE st %r15,__LC_KERNEL_STACK # set end of kernel stack 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, # and create a kernel NSS if the SAVESYS= parm is defined diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S index b1a8ceb522b1..3ccd36b24b8f 100644 --- a/arch/s390/kernel/head64.S +++ b/arch/s390/kernel/head64.S @@ -96,7 +96,6 @@ startup_continue: aghi %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union + THREAD_SIZE stg %r15,__LC_KERNEL_STACK # set end of kernel stack 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, # and create a kernel NSS if the SAVESYS= parm is defined |