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sh: fix futex/robust_list on nommu models

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The futex cmpxchg runtime testing in kernel/futex.c depends on
accesses to address 0 producing EFAULT, which obviously does not work
on nommu. Since SH always has cmpxchg, disable the broken runtime
detection.

At some point this should be fixed at the kernel/futex.c level. UP
machines can always provide a working cmpxchg with interrupt masking,
and SMP cannot function without a working cmpxchg anyway.

Signed-off-by: Rich Felker <dalias@libc.org>
This commit is contained in:
Rich Felker 2016-07-15 03:46:52 +00:00
parent 57155c6523
commit 72cc564f16
1 changed files with 1 additions and 0 deletions
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arch/sh/Kconfig
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@ -45,6 +45,7 @@ config SUPERH
select OLD_SIGSUSPEND
select OLD_SIGACTION
select HAVE_ARCH_AUDITSYSCALL
select HAVE_FUTEX_CMPXCHG if FUTEX
select HAVE_NMI
help
The SuperH is a RISC processor targeted for use in embedded systems