+ arm64-enable-armv85-a-asm-arch-option.patch added to -mm tree

* + arm64-enable-armv85-a-asm-arch-option.patch added to -mm tree
@ 2020-11-10 22:56 akpm
  0 siblings, 0 replies; 2+ messages in thread
From: akpm @ 2020-11-10 22:56 UTC (permalink / raw)
  To: andreyknvl, aryabinin, Branislav.Rankov, catalin.marinas,
	dvyukov, elver, eugenis, glider, gor, kevin.brodsky, mm-commits,
	vincenzo.frascino, will.deacon


The patch titled
     Subject: arm64: enable armv8.5-a asm-arch option
has been added to the -mm tree.  Its filename is
     arm64-enable-armv85-a-asm-arch-option.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/arm64-enable-armv85-a-asm-arch-option.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/arm64-enable-armv85-a-asm-arch-option.patch

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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next and is updated
there every 3-4 working days

------------------------------------------------------
From: Vincenzo Frascino <vincenzo.frascino@arm.com>
Subject: arm64: enable armv8.5-a asm-arch option

Hardware tag-based KASAN relies on Memory Tagging Extension (MTE) which
is an armv8.5-a architecture extension.

Enable the correct asm option when the compiler supports it in order to
allow the usage of ALTERNATIVE()s with MTE instructions.

Link: https://lkml.kernel.org/r/e7f69b87c86266c3671ec137f56e7740890155d3.1605046192.git.andreyknvl@google.com
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Branislav Rankov <Branislav.Rankov@arm.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Kevin Brodsky <kevin.brodsky@arm.com>
Cc: Marco Elver <elver@google.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/arm64/Kconfig  |    4 ++++
 arch/arm64/Makefile |    5 +++++
 2 files changed, 9 insertions(+)

--- a/arch/arm64/Kconfig~arm64-enable-armv85-a-asm-arch-option
+++ a/arch/arm64/Kconfig
@@ -1588,6 +1588,9 @@ endmenu
 
 menu "ARMv8.5 architectural features"
 
+config AS_HAS_ARMV8_5
+	def_bool $(cc-option,-Wa$(comma)-march=armv8.5-a)
+
 config ARM64_BTI
 	bool "Branch Target Identification support"
 	default y
@@ -1662,6 +1665,7 @@ config ARM64_MTE
 	bool "Memory Tagging Extension support"
 	default y
 	depends on ARM64_AS_HAS_MTE && ARM64_TAGGED_ADDR_ABI
+	depends on AS_HAS_ARMV8_5
 	select ARCH_USES_HIGH_VMA_FLAGS
 	help
 	  Memory Tagging (part of the ARMv8.5 Extensions) provides
--- a/arch/arm64/Makefile~arm64-enable-armv85-a-asm-arch-option
+++ a/arch/arm64/Makefile
@@ -100,6 +100,11 @@ ifeq ($(CONFIG_AS_HAS_ARMV8_4), y)
 asm-arch := armv8.4-a
 endif
 
+ifeq ($(CONFIG_AS_HAS_ARMV8_5), y)
+# make sure to pass the newest target architecture to -march.
+asm-arch := armv8.5-a
+endif
+
 ifdef asm-arch
 KBUILD_CFLAGS	+= -Wa,-march=$(asm-arch) \
 		   -DARM64_ASM_ARCH='"$(asm-arch)"'
_

Patches currently in -mm which might be from vincenzo.frascino@arm.com are

mm-vmalloc-fix-kasan-shadow-poisoning-size.patch
arm64-enable-armv85-a-asm-arch-option.patch
arm64-mte-add-in-kernel-mte-helpers.patch
arm64-mte-reset-the-page-tag-in-page-flags.patch
arm64-mte-add-in-kernel-tag-fault-handler.patch
arm64-kasan-allow-enabling-in-kernel-mte.patch
arm64-mte-convert-gcr_user-into-an-exclude-mask.patch
arm64-mte-switch-gcr_el1-in-kernel-entry-and-exit.patch
kasan-mm-untag-page-address-in-free_reserved_area.patch
kselftest-arm64-check-gcr_el1-after-context-switch.patch


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