From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
To: benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au
Cc: linuxppc-dev@lists.ozlabs.org,
"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Subject: [PATCH V2] powerpc: Don't do runtime futex_cmpxchg test
Date: Mon, 26 Feb 2018 19:39:50 +0530 [thread overview]
Message-ID: <20180226140950.12111-1-aneesh.kumar@linux.vnet.ibm.com> (raw)
futex_detect_cmpxchg() does a cmpxchg_futex_value_locked on a NULL user addr to
runtime detect whether architecture implements atomic cmpxchg for futex. POWER
do implement the feature and hence we can enable the config instead of depending
on runtime detection.
We could possible enable this on everything. For now limitted to book3s_64
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
arch/powerpc/platforms/Kconfig.cputype | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index a429d859f15d..31bc2bd5dfd1 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -75,6 +75,7 @@ config PPC_BOOK3S_64
select ARCH_SUPPORTS_NUMA_BALANCING
select IRQ_WORK
select HAVE_KERNEL_XZ
+ select HAVE_FUTEX_CMPXCHG if FUTEX
config PPC_BOOK3E_64
bool "Embedded processors"
--
2.14.3
next reply other threads:[~2018-02-26 14:10 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-26 14:09 Aneesh Kumar K.V [this message]
2018-02-26 22:16 ` [PATCH V2] powerpc: Don't do runtime futex_cmpxchg test Nicholas Piggin
2018-02-27 4:00 ` Aneesh Kumar K.V
2018-02-28 10:44 ` Michael Ellerman
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