From: Daniel Axtens <dja@axtens.net>
To: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linuxppc-dev@lists.ozlabs.org, kasan-dev@googlegroups.com,
christophe.leroy@c-s.fr, aneesh.kumar@linux.ibm.com,
bsingharora@gmail.com
Cc: Daniel Axtens <dja@axtens.net>
Subject: [PATCH v9 1/6] kasan: allow an architecture to disable inline instrumentation
Date: Wed, 2 Dec 2020 03:16:27 +1100 [thread overview]
Message-ID: <20201201161632.1234753-2-dja@axtens.net> (raw)
In-Reply-To: <20201201161632.1234753-1-dja@axtens.net>
For annoying architectural reasons, it's very difficult to support inline
instrumentation on powerpc64.
Add a Kconfig flag to allow an arch to disable inline. (It's a bit
annoying to be 'backwards', but I'm not aware of any way to have
an arch force a symbol to be 'n', rather than 'y'.)
Signed-off-by: Daniel Axtens <dja@axtens.net>
---
lib/Kconfig.kasan | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
index 542a9c18398e..31a0b28f6c2b 100644
--- a/lib/Kconfig.kasan
+++ b/lib/Kconfig.kasan
@@ -9,6 +9,9 @@ config HAVE_ARCH_KASAN_SW_TAGS
config HAVE_ARCH_KASAN_VMALLOC
bool
+config HAVE_ARCH_NO_KASAN_INLINE
+ def_bool n
+
config CC_HAS_KASAN_GENERIC
def_bool $(cc-option, -fsanitize=kernel-address)
@@ -108,6 +111,7 @@ config KASAN_OUTLINE
config KASAN_INLINE
bool "Inline instrumentation"
+ depends on !HAVE_ARCH_NO_KASAN_INLINE
help
Compiler directly inserts code checking shadow memory before
memory accesses. This is faster than outline (in some workloads
--
2.25.1
next prev parent reply other threads:[~2020-12-01 16:16 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-01 16:16 [PATCH v9 0/6] KASAN for powerpc64 radix Daniel Axtens
2020-12-01 16:16 ` Daniel Axtens [this message]
2020-12-01 16:49 ` [PATCH v9 1/6] kasan: allow an architecture to disable inline instrumentation Christophe Leroy
2020-12-01 16:16 ` [PATCH v9 2/6] kasan: allow architectures to provide an outline readiness check Daniel Axtens
2020-12-01 16:53 ` Christophe Leroy
2020-12-01 16:16 ` [PATCH v9 3/6] kasan: define and use MAX_PTRS_PER_* for early shadow tables Daniel Axtens
2020-12-01 16:54 ` Christophe Leroy
2020-12-01 16:16 ` [PATCH v9 4/6] kasan: Document support on 32-bit powerpc Daniel Axtens
2020-12-01 16:56 ` Christophe Leroy
2020-12-01 16:16 ` [PATCH v9 5/6] powerpc/mm/kasan: rename kasan_init_32.c to init_32.c Daniel Axtens
2020-12-01 16:56 ` Christophe Leroy
2020-12-01 16:16 ` [PATCH v9 6/6] powerpc: Book3S 64-bit outline-only KASAN support Daniel Axtens
2020-12-01 17:26 ` Christophe Leroy
2021-02-03 11:46 ` Daniel Axtens
2020-12-02 15:11 ` [PATCH v9 0/6] KASAN for powerpc64 radix Andrey Konovalov
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