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[S390] switch_to: dont restore/save access & fpu regs for kernel threads
authorHeiko Carstens <heiko.carstens@de.ibm.com>
Mon, 25 Oct 2010 14:10:18 +0000 (16:10 +0200)
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>
Mon, 25 Oct 2010 14:10:16 +0000 (16:10 +0200)
commitfdb6d070effba1871f0bb980cf3c3b8738803414
treea23343d98f472fb1fe8a2a4c8f86d269b64945bctree | snapshot
parentf861e4057263033ad9134bfd6745f91b2165b351commit | diff
[S390] switch_to: dont restore/save access & fpu regs for kernel threads

If the previous task was a kernel thread there is no need to save the
contents of the fpu and access registers since they aren't used in
kernel mode.
For the same reason it is not necessary to restore these registers if
the next task is a kernel thread.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
arch/s390/include/asm/system.h diff | blob | history
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