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s390/percpu: remove this_cpu_cmpxchg_double_4 

git commit 26f15caaf9 ("s390/cmpxchg: simplify cmpxchg_double")
removed support for cmpxchg_double for two consecutive four byte
values, for which it would generate a cds instruction.

However I forgot to remove the corresponding define in our percpu
header file, which means that this_cpu_cmpxchg_double would now
incorrectly generate a cdsg instruction if being used on a double four
byte location. Therefore remove the percpu define as well.

There is currently no user and therefore no bug fixed with
this. Obviously any such user could and should simply use cmpxchg.

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 2016-03-02 10:14:08 +01:00 committed by Martin Schwidefsky
parent b1685ab9bd
commit f369b98ee3
1 changed files with 0 additions and 1 deletions
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1
arch/s390/include/asm/percpu.h
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@ -178,7 +178,6 @@
ret__; \
})
#define this_cpu_cmpxchg_double_4 arch_this_cpu_cmpxchg_double
#define this_cpu_cmpxchg_double_8 arch_this_cpu_cmpxchg_double
#include <asm-generic/percpu.h>