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s390/process: fix sfpc inline assembly 

The sfpc inline assembly within execve_tail() may incorrectly set bits
28-31 of the sfpc instruction to a value which is not zero.
These bits however are currently unused and therefore should be zero
so we won't get surprised if these bits will be used in the future.

Therefore remove the second operand from the inline assembly.

Cc: <stable@vger.kernel.org>
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 2015-07-06 15:02:37 +02:00 committed by Martin Schwidefsky
parent f81a49d13b
commit e47994dd44
1 changed files with 1 additions and 1 deletions
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2
arch/s390/kernel/process.c
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@ -163,7 +163,7 @@ int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
asmlinkage void execve_tail(void)
{
current->thread.fp_regs.fpc = 0;
asm volatile("sfpc %0,%0" : : "d" (0));
asm volatile("sfpc %0" : : "d" (0));
}
/*