From: Eugeniy Paltsev <eugeniy.paltsev@synopsys.com>
To: linux-snps-arc@lists.infradead.org,
Vineet Gupta <vineet.gupta1@synopsys.com>
Cc: linux-kernel@vger.kernel.org,
Alexey Brodkin <alexey.brodkin@synopsys.com>,
Eugeniy Paltsev <eugeniy.paltsev@synopsys.com>
Subject: [PATCH v2 3/5] ARCv2: use unaligned access in SW
Date: Wed, 30 Jan 2019 19:32:42 +0300 [thread overview]
Message-ID: <20190130163244.10870-4-Eugeniy.Paltsev@synopsys.com> (raw)
In-Reply-To: <20190130163244.10870-1-Eugeniy.Paltsev@synopsys.com>
Select HAVE_EFFICIENT_UNALIGNED_ACCESS and allow GCC to generate
unaligned data if we enable enable unaligned access in HW.
Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
---
arch/arc/Kconfig | 1 +
arch/arc/Makefile | 6 ++++++
2 files changed, 7 insertions(+)
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index 37c8aeefa3a5..a1d976c612a6 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -390,6 +390,7 @@ if ISA_ARCV2
config ARC_USE_UNALIGNED_MEM_ACCESS
bool "Handle unaligned access in HW and use it"
default y
+ select HAVE_EFFICIENT_UNALIGNED_ACCESS
help
The ARC HS architecture supports unaligned memory access
which is disabled by default. Enable unaligned access in
diff --git a/arch/arc/Makefile b/arch/arc/Makefile
index df00578c279d..e2b991f75bc5 100644
--- a/arch/arc/Makefile
+++ b/arch/arc/Makefile
@@ -28,6 +28,12 @@ cflags-$(CONFIG_ARC_HAS_SWAPE) += -mswape
ifdef CONFIG_ISA_ARCV2
+ifdef CONFIG_ARC_USE_UNALIGNED_MEM_ACCESS
+cflags-y += -munaligned-access
+else
+cflags-y += -mno-unaligned-access
+endif
+
ifndef CONFIG_ARC_HAS_LL64
cflags-y += -mno-ll64
endif
--
2.14.5
next prev parent reply other threads:[~2019-01-30 16:33 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-30 16:32 [PATCH v2 0/5] introduce unaligned access under a Kconfig option Eugeniy Paltsev
2019-01-30 16:32 ` [PATCH v2 1/5] ARCv2: lib: memcpy: fix doing prefetchw outside of buffer Eugeniy Paltsev
2019-01-30 16:32 ` [PATCH v2 2/5] ARCv2: introduce unaligned access under a Kconfig option Eugeniy Paltsev
2019-02-01 23:27 ` Vineet Gupta
2019-02-01 23:36 ` Vineet Gupta
2019-01-30 16:32 ` Eugeniy Paltsev [this message]
2019-01-30 16:32 ` [PATCH v2 4/5] ARCv2: LIB: MEMCPY: fixed and optimised routine Eugeniy Paltsev
2019-01-30 16:32 ` [PATCH v2 5/5] ARC: boot log: print unaligned memory access details Eugeniy Paltsev
2019-02-02 0:47 ` [PATCH v2 0/5] introduce unaligned access under a Kconfig option Vineet Gupta
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