mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-25 16:31:13 +00:00
fec8fe8069
Refreshed all patches Remove upstreamed patches. - 103-MIPS-ath79-fix-register-address-in-ath79_ddr_wb_flus.patch - 403-mtd_fix_cfi_cmdset_0002_status_check.patch - 001-4.11-01-mtd-m25p80-consider-max-message-size-in-m25p80_read.patch - 001-4.15-08-bcm63xx_enet-correct-clock-usage.patch - 001-4.15-09-bcm63xx_enet-do-not-write-to-random-DMA-channel-on-B.patch - 900-gen_stats-fix-netlink-stats-padding.patch Introduce a new backported patch to address ext4 breakage, introduced in 4.9.112 - backport-4.9/500-ext4-fix-check-to-prevent-initializing-reserved-inod.patch This patch has been slightly altered to compensate for a new helper function introduced in later kernels. Also add ARM64_SSBD symbol to ARM64 targets still running kernel 4.9 Compile-tested on: ar71xx, bcm2710 Runtime-tested on: ar71xx Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
142 lines
5.4 KiB
Diff
142 lines
5.4 KiB
Diff
From: Arnd Bergmann <arnd@arndb.de>
|
|
Date: Tue, 19 Jun 2018 13:14:56 -0700
|
|
Subject: [PATCH] kbuild: add macro for controlling warnings to
|
|
linux/compiler.h
|
|
|
|
I have occasionally run into a situation where it would make sense to
|
|
control a compiler warning from a source file rather than doing so from
|
|
a Makefile using the $(cc-disable-warning, ...) or $(cc-option, ...)
|
|
helpers.
|
|
|
|
The approach here is similar to what glibc uses, using __diag() and
|
|
related macros to encapsulate a _Pragma("GCC diagnostic ...") statement
|
|
that gets turned into the respective "#pragma GCC diagnostic ..." by
|
|
the preprocessor when the macro gets expanded.
|
|
|
|
Like glibc, I also have an argument to pass the affected compiler
|
|
version, but decided to actually evaluate that one. For now, this
|
|
supports GCC_4_6, GCC_4_7, GCC_4_8, GCC_4_9, GCC_5, GCC_6, GCC_7,
|
|
GCC_8 and GCC_9. Adding support for CLANG_5 and other interesting
|
|
versions is straightforward here. GNU compilers starting with gcc-4.2
|
|
could support it in principle, but "#pragma GCC diagnostic push"
|
|
was only added in gcc-4.6, so it seems simpler to not deal with those
|
|
at all. The same versions show a large number of warnings already,
|
|
so it seems easier to just leave it at that and not do a more
|
|
fine-grained control for them.
|
|
|
|
The use cases I found so far include:
|
|
|
|
- turning off the gcc-8 -Wattribute-alias warning inside of the
|
|
SYSCALL_DEFINEx() macro without having to do it globally.
|
|
|
|
- Reducing the build time for a simple re-make after a change,
|
|
once we move the warnings from ./Makefile and
|
|
./scripts/Makefile.extrawarn into linux/compiler.h
|
|
|
|
- More control over the warnings based on other configurations,
|
|
using preprocessor syntax instead of Makefile syntax. This should make
|
|
it easier for the average developer to understand and change things.
|
|
|
|
- Adding an easy way to turn the W=1 option on unconditionally
|
|
for a subdirectory or a specific file. This has been requested
|
|
by several developers in the past that want to have their subsystems
|
|
W=1 clean.
|
|
|
|
- Integrating clang better into the build systems. Clang supports
|
|
more warnings than GCC, and we probably want to classify them
|
|
as default, W=1, W=2 etc, but there are cases in which the
|
|
warnings should be classified differently due to excessive false
|
|
positives from one or the other compiler.
|
|
|
|
- Adding a way to turn the default warnings into errors (e.g. using
|
|
a new "make E=0" tag) while not also turning the W=1 warnings into
|
|
errors.
|
|
|
|
This patch for now just adds the minimal infrastructure in order to
|
|
do the first of the list above. As the #pragma GCC diagnostic
|
|
takes precedence over command line options, the next step would be
|
|
to convert a lot of the individual Makefiles that set nonstandard
|
|
options to use __diag() instead.
|
|
|
|
[paul.burton@mips.com:
|
|
- Rebase atop current master.
|
|
- Add __diag_GCC, or more generally __diag_<compiler>, abstraction to
|
|
avoid code outside of linux/compiler-gcc.h needing to duplicate
|
|
knowledge about different GCC versions.
|
|
- Add a comment argument to __diag_{ignore,warn,error} which isn't
|
|
used in the expansion of the macros but serves to push people to
|
|
document the reason for using them - per feedback from Kees Cook.
|
|
- Translate severity to GCC-specific pragmas in linux/compiler-gcc.h
|
|
rather than using GCC-specific in linux/compiler_types.h.
|
|
- Drop all but GCC 8 macros, since we only need to define macros for
|
|
versions that we need to introduce pragmas for, and as of this
|
|
series that's just GCC 8.
|
|
- Capitalize comments in linux/compiler-gcc.h to match the style of
|
|
the rest of the file.
|
|
- Line up macro definitions with tabs in linux/compiler-gcc.h.]
|
|
|
|
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
|
|
Signed-off-by: Paul Burton <paul.burton@mips.com>
|
|
Tested-by: Christophe Leroy <christophe.leroy@c-s.fr>
|
|
Tested-by: Stafford Horne <shorne@gmail.com>
|
|
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
|
|
---
|
|
|
|
--- a/include/linux/compiler-gcc.h
|
|
+++ b/include/linux/compiler-gcc.h
|
|
@@ -334,3 +334,28 @@
|
|
* code
|
|
*/
|
|
#define uninitialized_var(x) x = x
|
|
+
|
|
+/*
|
|
+ * Turn individual warnings and errors on and off locally, depending
|
|
+ * on version.
|
|
+ */
|
|
+#define __diag_GCC(version, severity, s) \
|
|
+ __diag_GCC_ ## version(__diag_GCC_ ## severity s)
|
|
+
|
|
+/* Severity used in pragma directives */
|
|
+#define __diag_GCC_ignore ignored
|
|
+#define __diag_GCC_warn warning
|
|
+#define __diag_GCC_error error
|
|
+
|
|
+/* Compilers before gcc-4.6 do not understand "#pragma GCC diagnostic push" */
|
|
+#if GCC_VERSION >= 40600
|
|
+#define __diag_str1(s) #s
|
|
+#define __diag_str(s) __diag_str1(s)
|
|
+#define __diag(s) _Pragma(__diag_str(GCC diagnostic s))
|
|
+#endif
|
|
+
|
|
+#if GCC_VERSION >= 80000
|
|
+#define __diag_GCC_8(s) __diag(s)
|
|
+#else
|
|
+#define __diag_GCC_8(s)
|
|
+#endif
|
|
--- a/include/linux/compiler.h
|
|
+++ b/include/linux/compiler.h
|
|
@@ -578,4 +578,23 @@ static __always_inline void __write_once
|
|
# define __kprobes
|
|
# define nokprobe_inline inline
|
|
#endif
|
|
+
|
|
+#ifndef __diag
|
|
+#define __diag(string)
|
|
+#endif
|
|
+
|
|
+#ifndef __diag_GCC
|
|
+#define __diag_GCC(version, severity, string)
|
|
+#endif
|
|
+
|
|
+#define __diag_push() __diag(push)
|
|
+#define __diag_pop() __diag(pop)
|
|
+
|
|
+#define __diag_ignore(compiler, version, option, comment) \
|
|
+ __diag_ ## compiler(version, ignore, option)
|
|
+#define __diag_warn(compiler, version, option, comment) \
|
|
+ __diag_ ## compiler(version, warn, option)
|
|
+#define __diag_error(compiler, version, option, comment) \
|
|
+ __diag_ ## compiler(version, error, option)
|
|
+
|
|
#endif /* __LINUX_COMPILER_H */
|