From 72cc564f16ca9f61a1d13f35cb247631d888a78e Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Fri, 15 Jul 2016 03:46:52 +0000 Subject: [PATCH] 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: Rich Felker --- arch/sh/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig index ceeda5c1a70a..e6d88f9e978a 100644 --- a/arch/sh/Kconfig +++ b/arch/sh/Kconfig @@ -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