From: Nick Desaulniers <ndesaulniers@google.com>
To: "Paul E . McKenney" <paulmck@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Lai Jiangshan <jiangshanlai@gmail.com>,
Josh Triplett <josh@joshtriplett.org>,
Kees Cook <keescook@chromium.org>,
linux-kernel@vger.kernel.org, rcu@vger.kernel.org,
clang-built-linux@googlegroups.com,
Nick Desaulniers <ndesaulniers@google.com>
Subject: [PATCH] srcu: avoid escaped section names
Date: Tue, 29 Sep 2020 12:22:04 -0700 [thread overview]
Message-ID: <20200929192204.499006-1-ndesaulniers@google.com> (raw)
The stringification operator, `#`, in the preprocessor escapes strings.
For example, `# "foo"` becomes `"\"foo\""`. GCC and Clang differ in how
they treat section names that contain \".
The portable solution is to not use a string literal with the
preprocessor stringification operator.
Link: https://bugs.llvm.org/show_bug.cgi?id=42950
Fixes: commit fe15b50cdeee ("srcu: Allocate per-CPU data for DEFINE_SRCU() in modules")
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
---
arch/arm/Kconfig | 1 +
arch/arm/mm/Kconfig | 11 +++++++++++
include/linux/srcutree.h | 2 +-
3 files changed, 13 insertions(+), 1 deletion(-)
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index fe2f17eb2b50..51200e371faf 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -358,6 +358,7 @@ config ARCH_EBSA110
config ARCH_EP93XX
bool "EP93xx-based"
+ depends on !LD_IS_LLD
select ARCH_SPARSEMEM_ENABLE
select ARM_AMBA
imply ARM_PATCH_PHYS_VIRT
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index 65e4482e3849..c06787c9bb48 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -9,6 +9,7 @@ comment "Processor Type"
config CPU_ARM7TDMI
bool
depends on !MMU
+ depends on !LD_IS_LLD
select CPU_32v4T
select CPU_ABRT_LV4T
select CPU_CACHE_V4
@@ -23,6 +24,7 @@ config CPU_ARM7TDMI
# ARM720T
config CPU_ARM720T
bool
+ depends on !LD_IS_LLD
select CPU_32v4T
select CPU_ABRT_LV4T
select CPU_CACHE_V4
@@ -43,6 +45,7 @@ config CPU_ARM720T
config CPU_ARM740T
bool
depends on !MMU
+ depends on !LD_IS_LLD
select CPU_32v4T
select CPU_ABRT_LV4T
select CPU_CACHE_V4
@@ -61,6 +64,7 @@ config CPU_ARM740T
config CPU_ARM9TDMI
bool
depends on !MMU
+ depends on !LD_IS_LLD
select CPU_32v4T
select CPU_ABRT_NOMMU
select CPU_CACHE_V4
@@ -75,6 +79,7 @@ config CPU_ARM9TDMI
# ARM920T
config CPU_ARM920T
bool
+ depends on !LD_IS_LLD
select CPU_32v4T
select CPU_ABRT_EV4T
select CPU_CACHE_V4WT
@@ -94,6 +99,7 @@ config CPU_ARM920T
# ARM922T
config CPU_ARM922T
bool
+ depends on !LD_IS_LLD
select CPU_32v4T
select CPU_ABRT_EV4T
select CPU_CACHE_V4WT
@@ -114,6 +120,7 @@ config CPU_ARM922T
# ARM925T
config CPU_ARM925T
bool
+ depends on !LD_IS_LLD
select CPU_32v4T
select CPU_ABRT_EV4T
select CPU_CACHE_V4WT
@@ -153,6 +160,7 @@ config CPU_ARM926T
# FA526
config CPU_FA526
bool
+ depends on !LD_IS_LLD
select CPU_32v4
select CPU_ABRT_EV4
select CPU_CACHE_FA
@@ -172,6 +180,7 @@ config CPU_FA526
config CPU_ARM940T
bool
depends on !MMU
+ depends on !LD_IS_LLD
select CPU_32v4T
select CPU_ABRT_NOMMU
select CPU_CACHE_VIVT
@@ -278,6 +287,7 @@ config CPU_ARM1026
# SA110
config CPU_SA110
bool
+ depends on !LD_IS_LLD
select CPU_32v3 if ARCH_RPC
select CPU_32v4 if !ARCH_RPC
select CPU_ABRT_EV4
@@ -299,6 +309,7 @@ config CPU_SA110
# SA1100
config CPU_SA1100
bool
+ depends on !LD_IS_LLD
select CPU_32v4
select CPU_ABRT_EV4
select CPU_CACHE_V4WB
diff --git a/include/linux/srcutree.h b/include/linux/srcutree.h
index 9cfcc8a756ae..9de652f4e1bd 100644
--- a/include/linux/srcutree.h
+++ b/include/linux/srcutree.h
@@ -124,7 +124,7 @@ struct srcu_struct {
# define __DEFINE_SRCU(name, is_static) \
is_static struct srcu_struct name; \
struct srcu_struct * const __srcu_struct_##name \
- __section("___srcu_struct_ptrs") = &name
+ __section(___srcu_struct_ptrs) = &name
#else
# define __DEFINE_SRCU(name, is_static) \
static DEFINE_PER_CPU(struct srcu_data, name##_srcu_data); \
--
2.28.0.709.gb0816b6eb0-goog
next reply other threads:[~2020-09-29 19:22 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-29 19:22 Nick Desaulniers [this message]
2020-09-29 19:22 ` [PATCH] srcu: avoid escaped section names Nick Desaulniers
2020-09-29 19:25 ` [PATCH v2] " Nick Desaulniers
2020-09-29 23:45 ` Kees Cook
2020-09-30 16:27 ` Nathan Chancellor
2020-09-30 16:41 ` Sedat Dilek
2020-09-30 18:57 ` Joe Perches
2020-09-30 19:16 ` [RFC PATCH next-20200930] treewide: Convert macro and uses of __section(foo) to __section("foo") Joe Perches
2020-09-30 21:40 ` Nick Desaulniers
2020-09-30 22:06 ` Joe Perches
2020-09-30 22:12 ` Joe Perches
2020-09-30 22:20 ` Nick Desaulniers
2020-09-30 22:25 ` Joe Perches
2020-09-30 22:56 ` Joe Perches
2020-10-01 10:15 ` Miguel Ojeda
2020-10-01 19:05 ` Joe Perches
2020-10-01 19:39 ` Segher Boessenkool
2020-10-01 20:19 ` Joe Perches
2020-10-05 18:36 ` Nick Desaulniers
2020-10-05 18:46 ` Joe Perches
2020-10-06 0:34 ` Joel Stanley
2020-10-06 3:22 ` Joe Perches
2020-09-30 20:40 ` [PATCH v2] srcu: avoid escaped section names Paul E. McKenney
2020-09-30 20:55 ` Nick Desaulniers
2020-10-02 20:51 ` Paul E. McKenney
2020-10-05 18:29 ` Nick Desaulniers
2020-10-05 18:38 ` Sedat Dilek
2020-10-05 18:49 ` Paul E. McKenney
2020-10-06 6:56 ` Nathan Chancellor
2020-10-07 21:05 ` Paul E. McKenney
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