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Commit 72cc564f authored by Rich Felker's avatar Rich Felker
Browse files

sh: fix futex/robust_list on nommu models 



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: default avatarRich Felker <dalias@libc.org>
parent 57155c65

arch/sh/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -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