From: Vineet Gupta <vgupta@kernel.org>
Date: Mon, 13 Jan 2020 23:24:34 +0000 (-0800)
Subject: ARC: uaccess: use optimized generic __strnlen_user/__strncpy_from_user
X-Git-Tag: v6.6-rc1~56^2~20
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=f798f91e7f5f000285ab11696d3f4af6aa20b869;p=thirdparty%2Fkernel%2Flinux.git

ARC: uaccess: use optimized generic __strnlen_user/__strncpy_from_user

The existing ARC variants have 2 issues
 - Use ZOL which may not be present in forthcoming architecture
 - Byte loop based vs. generic version which is word loop based

Signed-off-by: Vineet Gupta <vgupta@kernel.org>
---

diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index 96cf8720bb939..47b4acc7d0c9c 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -26,6 +26,8 @@ config ARC
 	select GENERIC_PENDING_IRQ if SMP
 	select GENERIC_SCHED_CLOCK
 	select GENERIC_SMP_IDLE_THREAD
+	select GENERIC_STRNCPY_FROM_USER if MMU
+	select GENERIC_STRNLEN_USER if MMU
 	select HAVE_ARCH_KGDB
 	select HAVE_ARCH_TRACEHOOK
 	select HAVE_ARCH_TRANSPARENT_HUGEPAGE if ARC_MMU_V4