Linux v5.0-rc7
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Laura Abbott
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Fri, 08 Feb 2019 16:09:04 -0800 (PST)
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From: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
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To: linux-kernel@vger.kernel.org
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Cc: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>,
|
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Laura Abbott <labbott@redhat.com>,
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Martin Sebor <msebor@gcc.gnu.org>,
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Arnd Bergmann <arnd@arndb.de>,
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Herbert Xu <herbert@gondor.apana.org.au>,
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Ard Biesheuvel <ard.biesheuvel@linaro.org>,
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Krzysztof Kozlowski <krzk@kernel.org>,
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Catalin Marinas <catalin.marinas@arm.com>
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Subject: [PATCH 1/3] lib/crc32.c: mark crc32_le_base/__crc32c_le_base aliases
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as __pure
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Date: Sat, 9 Feb 2019 01:08:38 +0100
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Message-Id: <20190209000840.11018-2-miguel.ojeda.sandonis@gmail.com>
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In-Reply-To: <20190209000840.11018-1-miguel.ojeda.sandonis@gmail.com>
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References: <20190209000840.11018-1-miguel.ojeda.sandonis@gmail.com>
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The upcoming GCC 9 release extends the -Wmissing-attributes warnings
|
||||
(enabled by -Wall) to C and aliases: it warns when particular function
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attributes are missing in the aliases but not in their target.
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|
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In particular, it triggers here because crc32_le_base/__crc32c_le_base
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aren't __pure while their target crc32_le/__crc32c_le are.
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These aliases are used by architectures as a fallback in accelerated
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versions of CRC32. See commit 9784d82db3eb ("lib/crc32: make core crc32()
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routines weak so they can be overridden").
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Therefore, being fallbacks, it is likely that even if the aliases
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were called from C, there wouldn't be any optimizations possible.
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Currently, the only user is arm64, which calls this from asm.
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Still, marking the aliases as __pure makes sense and is a good idea
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for documentation purposes and possible future optimizations,
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which also silences the warning.
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Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
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Tested-by: Laura Abbott <labbott@redhat.com>
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Signed-off-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
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---
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lib/crc32.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/lib/crc32.c b/lib/crc32.c
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index 45b1d67a1767..4a20455d1f61 100644
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--- a/lib/crc32.c
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+++ b/lib/crc32.c
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@@ -206,8 +206,8 @@ u32 __pure __weak __crc32c_le(u32 crc, unsigned char const *p, size_t len)
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EXPORT_SYMBOL(crc32_le);
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EXPORT_SYMBOL(__crc32c_le);
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-u32 crc32_le_base(u32, unsigned char const *, size_t) __alias(crc32_le);
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-u32 __crc32c_le_base(u32, unsigned char const *, size_t) __alias(__crc32c_le);
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+u32 __pure crc32_le_base(u32, unsigned char const *, size_t) __alias(crc32_le);
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+u32 __pure __crc32c_le_base(u32, unsigned char const *, size_t) __alias(__crc32c_le);
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|
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/*
|
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* This multiplies the polynomials x and y modulo the given modulus.
|
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From patchwork Sat Feb 9 00:08:39 2019
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Fri, 08 Feb 2019 16:09:05 -0800 (PST)
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From: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
|
||||
To: linux-kernel@vger.kernel.org
|
||||
Cc: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>,
|
||||
Martin Sebor <msebor@gcc.gnu.org>,
|
||||
Arnd Bergmann <arnd@arndb.de>,
|
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Laura Abbott <labbott@redhat.com>,
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Nick Desaulniers <ndesaulniers@google.com>,
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Luc Van Oostenryck <luc.vanoostenryck@gmail.com>,
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Kees Cook <keescook@chromium.org>,
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Sean Christopherson <sean.j.christopherson@intel.com>
|
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Subject: [PATCH 2/3] Compiler Attributes: add support for __copy (gcc >= 9)
|
||||
Date: Sat, 9 Feb 2019 01:08:39 +0100
|
||||
Message-Id: <20190209000840.11018-3-miguel.ojeda.sandonis@gmail.com>
|
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In-Reply-To: <20190209000840.11018-1-miguel.ojeda.sandonis@gmail.com>
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From the GCC manual:
|
||||
|
||||
copy
|
||||
copy(function)
|
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|
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The copy attribute applies the set of attributes with which function
|
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has been declared to the declaration of the function to which
|
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the attribute is applied. The attribute is designed for libraries
|
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that define aliases or function resolvers that are expected
|
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to specify the same set of attributes as their targets. The copy
|
||||
attribute can be used with functions, variables, or types. However,
|
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the kind of symbol to which the attribute is applied (either
|
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function or variable) must match the kind of symbol to which
|
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the argument refers. The copy attribute copies only syntactic and
|
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semantic attributes but not attributes that affect a symbol’s
|
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linkage or visibility such as alias, visibility, or weak.
|
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The deprecated attribute is also not copied.
|
||||
|
||||
https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html
|
||||
|
||||
The upcoming GCC 9 release extends the -Wmissing-attributes warnings
|
||||
(enabled by -Wall) to C and aliases: it warns when particular function
|
||||
attributes are missing in the aliases but not in their target, e.g.:
|
||||
|
||||
void __cold f(void) {}
|
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void __alias("f") g(void);
|
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|
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diagnoses:
|
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|
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warning: 'g' specifies less restrictive attribute than
|
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its target 'f': 'cold' [-Wmissing-attributes]
|
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|
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Using __copy(f) we can copy the __cold attribute from f to g:
|
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|
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void __cold f(void) {}
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void __copy(f) __alias("f") g(void);
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|
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This attribute is most useful to deal with situations where an alias
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is declared but we don't know the exact attributes the target has.
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|
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For instance, in the kernel, the widely used module_init/exit macros
|
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define the init/cleanup_module aliases, but those cannot be marked
|
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always as __init/__exit since they some modules do not have their
|
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functions marked as such.
|
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|
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Suggested-by: Martin Sebor <msebor@gcc.gnu.org>
|
||||
Signed-off-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
|
||||
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
|
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---
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include/linux/compiler_attributes.h | 14 ++++++++++++++
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1 file changed, 14 insertions(+)
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diff --git a/include/linux/compiler_attributes.h b/include/linux/compiler_attributes.h
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index 19f32b0c29af..6b318efd8a74 100644
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--- a/include/linux/compiler_attributes.h
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+++ b/include/linux/compiler_attributes.h
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@@ -34,6 +34,7 @@
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#ifndef __has_attribute
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# define __has_attribute(x) __GCC4_has_attribute_##x
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# define __GCC4_has_attribute___assume_aligned__ (__GNUC_MINOR__ >= 9)
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+# define __GCC4_has_attribute___copy__ 0
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# define __GCC4_has_attribute___designated_init__ 0
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# define __GCC4_has_attribute___externally_visible__ 1
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# define __GCC4_has_attribute___noclone__ 1
|
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@@ -100,6 +101,19 @@
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*/
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#define __attribute_const__ __attribute__((__const__))
|
||||
|
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+/*
|
||||
+ * Optional: only supported since gcc >= 9
|
||||
+ * Optional: not supported by clang
|
||||
+ * Optional: not supported by icc
|
||||
+ *
|
||||
+ * gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-copy-function-attribute
|
||||
+ */
|
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+#if __has_attribute(__copy__)
|
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+# define __copy(symbol) __attribute__((__copy__(symbol)))
|
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+#else
|
||||
+# define __copy(symbol)
|
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+#endif
|
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+
|
||||
/*
|
||||
* Don't. Just don't. See commit 771c035372a0 ("deprecate the '__deprecated'
|
||||
* attribute warnings entirely and for good") for more information.
|
||||
|
||||
From patchwork Sat Feb 9 00:08:40 2019
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Fri, 08 Feb 2019 16:09:06 -0800 (PST)
|
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From: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
|
||||
To: Jessica Yu <jeyu@kernel.org>
|
||||
Cc: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>,
|
||||
Laura Abbott <labbott@redhat.com>,
|
||||
Martin Sebor <msebor@gcc.gnu.org>,
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Arnd Bergmann <arnd@arndb.de>,
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Masahiro Yamada <yamada.masahiro@socionext.com>,
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James Morris <james.morris@microsoft.com>,
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Vincent Whitchurch <vincent.whitchurch@axis.com>,
|
||||
WANG Chao <chao.wang@ucloud.cn>, linux-kernel@vger.kernel.org
|
||||
Subject: [PATCH 3/3] include/linux/module.h: copy __init/__exit attrs to
|
||||
init/cleanup_module
|
||||
Date: Sat, 9 Feb 2019 01:08:40 +0100
|
||||
Message-Id: <20190209000840.11018-4-miguel.ojeda.sandonis@gmail.com>
|
||||
In-Reply-To: <20190209000840.11018-1-miguel.ojeda.sandonis@gmail.com>
|
||||
References: <20190209000840.11018-1-miguel.ojeda.sandonis@gmail.com>
|
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Sender: linux-kernel-owner@vger.kernel.org
|
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Precedence: bulk
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List-ID: <linux-kernel.vger.kernel.org>
|
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X-Mailing-List: linux-kernel@vger.kernel.org
|
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|
||||
The upcoming GCC 9 release extends the -Wmissing-attributes warnings
|
||||
(enabled by -Wall) to C and aliases: it warns when particular function
|
||||
attributes are missing in the aliases but not in their target.
|
||||
|
||||
In particular, it triggers for all the init/cleanup_module
|
||||
aliases in the kernel (defined by the module_init/exit macros),
|
||||
ending up being very noisy.
|
||||
|
||||
These aliases point to the __init/__exit functions of a module,
|
||||
which are defined as __cold (among other attributes). However,
|
||||
the aliases themselves do not have the __cold attribute.
|
||||
|
||||
Since the compiler behaves differently when compiling a __cold
|
||||
function as well as when compiling paths leading to calls
|
||||
to __cold functions, the warning is trying to point out
|
||||
the possibly-forgotten attribute in the alias.
|
||||
|
||||
In order to keep the warning enabled, we decided to silence
|
||||
this case. Ideally, we would mark the aliases directly
|
||||
as __init/__exit. However, there are currently around 132 modules
|
||||
in the kernel which are missing __init/__exit in their init/cleanup
|
||||
functions (either because they are missing, or for other reasons,
|
||||
e.g. the functions being called from somewhere else); and
|
||||
a section mismatch is a hard error.
|
||||
|
||||
A conservative alternative was to mark the aliases as __cold only.
|
||||
However, since we would like to eventually enforce __init/__exit
|
||||
to be always marked, we chose to use the new __copy function
|
||||
attribute (introduced by GCC 9 as well to deal with this).
|
||||
With it, we copy the attributes used by the target functions
|
||||
into the aliases. This way, functions that were not marked
|
||||
as __init/__exit won't have their aliases marked either,
|
||||
and therefore there won't be a section mismatch.
|
||||
|
||||
Note that the warning would go away marking either the extern
|
||||
declaration, the definition, or both. However, we only mark
|
||||
the definition of the alias, since we do not want callers
|
||||
(which only see the declaration) to be compiled as if the function
|
||||
was __cold (and therefore the paths leading to those calls
|
||||
would be assumed to be unlikely).
|
||||
|
||||
Link: https://lore.kernel.org/lkml/20190123173707.GA16603@gmail.com/
|
||||
Link: https://lore.kernel.org/lkml/20190206175627.GA20399@gmail.com/
|
||||
Suggested-by: Martin Sebor <msebor@gcc.gnu.org>
|
||||
Signed-off-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
|
||||
---
|
||||
include/linux/module.h | 4 ++--
|
||||
1 file changed, 2 insertions(+), 2 deletions(-)
|
||||
|
||||
diff --git a/include/linux/module.h b/include/linux/module.h
|
||||
index 8fa38d3e7538..f5bc4c046461 100644
|
||||
--- a/include/linux/module.h
|
||||
+++ b/include/linux/module.h
|
||||
@@ -129,13 +129,13 @@ extern void cleanup_module(void);
|
||||
#define module_init(initfn) \
|
||||
static inline initcall_t __maybe_unused __inittest(void) \
|
||||
{ return initfn; } \
|
||||
- int init_module(void) __attribute__((alias(#initfn)));
|
||||
+ int init_module(void) __copy(initfn) __attribute__((alias(#initfn)));
|
||||
|
||||
/* This is only required if you want to be unloadable. */
|
||||
#define module_exit(exitfn) \
|
||||
static inline exitcall_t __maybe_unused __exittest(void) \
|
||||
{ return exitfn; } \
|
||||
- void cleanup_module(void) __attribute__((alias(#exitfn)));
|
||||
+ void cleanup_module(void) __copy(exitfn) __attribute__((alias(#exitfn)));
|
||||
|
||||
#endif
|
||||
|
||||
|
|
@ -164,18 +164,18 @@ index 100ce4a4aff6..62361b647a75 100644
|
|||
|
||||
#ifdef CONFIG_EFI
|
||||
/*
|
||||
@@ -1169,6 +1177,8 @@ extern void efi_reboot(enum reboot_mode reboot_mode, const char *__unused);
|
||||
@@ -1198,6 +1206,8 @@ static inline bool efi_enabled(int feature)
|
||||
extern void efi_reboot(enum reboot_mode reboot_mode, const char *__unused);
|
||||
|
||||
extern bool efi_is_table_address(unsigned long phys_addr);
|
||||
|
||||
extern int efi_apply_persistent_mem_reservations(void);
|
||||
+
|
||||
+extern void __init efi_set_secure_boot(enum efi_secureboot_mode mode);
|
||||
#else
|
||||
static inline bool efi_enabled(int feature)
|
||||
{
|
||||
@@ -1192,6 +1202,8 @@ static inline int efi_apply_persistent_mem_reservations(void)
|
||||
@@ -1216,6 +1226,8 @@ static inline bool efi_is_table_address(unsigned long phys_addr)
|
||||
{
|
||||
return 0;
|
||||
return false;
|
||||
}
|
||||
+
|
||||
+static inline void efi_set_secure_boot(enum efi_secureboot_mode mode) {}
|
||||
|
|
|
|||
13
kernel.spec
13
kernel.spec
|
|
@ -69,9 +69,9 @@ Summary: The Linux kernel
|
|||
# Work around for major version bump
|
||||
%define upstream_sublevel 0
|
||||
# The rc snapshot level
|
||||
%global rcrev 6
|
||||
%global rcrev 7
|
||||
# The git snapshot level
|
||||
%define gitrev 1
|
||||
%define gitrev 0
|
||||
# Set rpm version accordingly
|
||||
%define rpmversion 5.%{upstream_sublevel}.0
|
||||
%endif
|
||||
|
|
@ -124,7 +124,7 @@ Summary: The Linux kernel
|
|||
# Set debugbuildsenabled to 1 for production (build separate debug kernels)
|
||||
# and 0 for rawhide (all kernels are debug kernels).
|
||||
# See also 'make debug' and 'make release'.
|
||||
%define debugbuildsenabled 0
|
||||
%define debugbuildsenabled 1
|
||||
|
||||
# Kernel headers are being split out into a separate package
|
||||
%if 0%{?fedora}
|
||||
|
|
@ -428,7 +428,7 @@ BuildRequires: binutils-%{_build_arch}-linux-gnu, gcc-%{_build_arch}-linux-gnu
|
|||
%endif
|
||||
|
||||
# Source0: https://www.kernel.org/pub/linux/kernel/v5.x/linux-%{kversion}.tar.xz
|
||||
Source0: https://git.kernel.org/torvalds/t/linux-5.0-rc6.tar.gz
|
||||
Source0: https://git.kernel.org/torvalds/t/linux-5.0-rc7.tar.gz
|
||||
|
||||
Source11: x509.genkey
|
||||
Source12: remove-binary-diff.pl
|
||||
|
|
@ -602,7 +602,6 @@ Patch501: input-rmi4-remove-the-need-for-artifical-IRQ.patch
|
|||
Patch504: efi-use-32-bit-alignment-for-efi_guid_t.patch
|
||||
|
||||
# gcc9 fixes
|
||||
Patch505: Clean-the-new-GCC-9--Wmissing-attributes-warnings.patch
|
||||
Patch506: 0001-s390-jump_label-Correct-asm-contraint.patch
|
||||
Patch507: 0001-Drop-that-for-now.patch
|
||||
|
||||
|
|
@ -1887,6 +1886,10 @@ fi
|
|||
#
|
||||
#
|
||||
%changelog
|
||||
* Mon Feb 18 2019 Laura Abbott <labbott@redhat.com> - 5.0.0-0.rc7.git0.1
|
||||
- Linux v5.0-rc7
|
||||
- Disable debugging options.
|
||||
|
||||
* Wed Feb 13 2019 Laura Abbott <labbott@redhat.com> - 5.0.0-0.rc6.git1.1
|
||||
- Linux v5.0-rc6-42-g1f947a7a011f
|
||||
|
||||
|
|
|
|||
3
sources
3
sources
|
|
@ -1,2 +1 @@
|
|||
SHA512 (linux-5.0-rc6.tar.gz) = de3d6acf9282cfa831e87994df9c2cc855b43cd2638a6417888098e3ce54384780e67c8de0ca6a9163950808012bc4de28740e61c00d3337506d76da840d6ff5
|
||||
SHA512 (patch-5.0-rc6-git1.xz) = be4d6c6b19d529e93585750286d07e32a555db09fc481b4d39f2b59bf34ba1df504bdb6b89a67522a66741b099bd5a5d99742ec167d6e706f07963cefbc7cbbc
|
||||
SHA512 (linux-5.0-rc7.tar.gz) = 4458043fcaf85cbbe5155a46267bebb505575e954babe4525c0a3e5d3515f97d2774487f71617792490eb01d83ae710fd33c454ac636978d6fcd3c1e77dad2f7
|
||||
|
|
|
|||
Loading…
Reference in New Issue