+++ /dev/null
-From 101110f6271ce956a049250c907bc960030577f8 Mon Sep 17 00:00:00 2001
-From: Arnd Bergmann <arnd@arndb.de>
-Date: Wed, 21 Feb 2018 14:45:20 -0800
-Subject: Kbuild: always define endianess in kconfig.h
-
-From: Arnd Bergmann <arnd@arndb.de>
-
-commit 101110f6271ce956a049250c907bc960030577f8 upstream.
-
-Build testing with LTO found a couple of files that get compiled
-differently depending on whether asm/byteorder.h gets included early
-enough or not. In particular, include/asm-generic/qrwlock_types.h is
-affected by this, but there are probably others as well.
-
-The symptom is a series of LTO link time warnings, including these:
-
- net/netlabel/netlabel_unlabeled.h:223: error: type of 'netlbl_unlhsh_add' does not match original declaration [-Werror=lto-type-mismatch]
- int netlbl_unlhsh_add(struct net *net,
- net/netlabel/netlabel_unlabeled.c:377: note: 'netlbl_unlhsh_add' was previously declared here
-
- include/net/ipv6.h:360: error: type of 'ipv6_renew_options_kern' does not match original declaration [-Werror=lto-type-mismatch]
- ipv6_renew_options_kern(struct sock *sk,
- net/ipv6/exthdrs.c:1162: note: 'ipv6_renew_options_kern' was previously declared here
-
- net/core/dev.c:761: note: 'dev_get_by_name_rcu' was previously declared here
- struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
- net/core/dev.c:761: note: code may be misoptimized unless -fno-strict-aliasing is used
-
- drivers/gpu/drm/i915/i915_drv.h:3377: error: type of 'i915_gem_object_set_to_wc_domain' does not match original declaration [-Werror=lto-type-mismatch]
- i915_gem_object_set_to_wc_domain(struct drm_i915_gem_object *obj, bool write);
- drivers/gpu/drm/i915/i915_gem.c:3639: note: 'i915_gem_object_set_to_wc_domain' was previously declared here
-
- include/linux/debugfs.h:92:9: error: type of 'debugfs_attr_read' does not match original declaration [-Werror=lto-type-mismatch]
- ssize_t debugfs_attr_read(struct file *file, char __user *buf,
- fs/debugfs/file.c:318: note: 'debugfs_attr_read' was previously declared here
-
- include/linux/rwlock_api_smp.h:30: error: type of '_raw_read_unlock' does not match original declaration [-Werror=lto-type-mismatch]
- void __lockfunc _raw_read_unlock(rwlock_t *lock) __releases(lock);
- kernel/locking/spinlock.c:246:26: note: '_raw_read_unlock' was previously declared here
-
- include/linux/fs.h:3308:5: error: type of 'simple_attr_open' does not match original declaration [-Werror=lto-type-mismatch]
- int simple_attr_open(struct inode *inode, struct file *file,
- fs/libfs.c:795: note: 'simple_attr_open' was previously declared here
-
-All of the above are caused by include/asm-generic/qrwlock_types.h
-failing to include asm/byteorder.h after commit e0d02285f16e
-("locking/qrwlock: Use 'struct qrwlock' instead of 'struct __qrwlock'")
-in linux-4.15.
-
-Similar bugs may or may not exist in older kernels as well, but there is
-no easy way to test those with link-time optimizations, and kernels
-before 4.14 are harder to fix because they don't have Babu's patch
-series
-
-We had similar issues with CONFIG_ symbols in the past and ended up
-always including the configuration headers though linux/kconfig.h. This
-works around the issue through that same file, defining either
-__BIG_ENDIAN or __LITTLE_ENDIAN depending on CONFIG_CPU_BIG_ENDIAN,
-which is now always set on all architectures since commit 4c97a0c8fee3
-("arch: define CPU_BIG_ENDIAN for all fixed big endian archs").
-
-Link: http://lkml.kernel.org/r/20180202154104.1522809-2-arnd@arndb.de
-Signed-off-by: Arnd Bergmann <arnd@arndb.de>
-Cc: Babu Moger <babu.moger@amd.com>
-Cc: Andi Kleen <ak@linux.intel.com>
-Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
-Cc: Nicolas Pitre <nico@linaro.org>
-Cc: Peter Zijlstra <peterz@infradead.org>
-Cc: Thomas Gleixner <tglx@linutronix.de>
-Cc: Will Deacon <will.deacon@arm.com>
-Cc: <stable@vger.kernel.org>
-Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
-Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-
----
- include/linux/kconfig.h | 6 ++++++
- 1 file changed, 6 insertions(+)
-
---- a/include/linux/kconfig.h
-+++ b/include/linux/kconfig.h
-@@ -3,6 +3,12 @@
-
- #include <generated/autoconf.h>
-
-+#ifdef CONFIG_CPU_BIG_ENDIAN
-+#define __BIG_ENDIAN 4321
-+#else
-+#define __LITTLE_ENDIAN 1234
-+#endif
-+
- #define __ARG_PLACEHOLDER_1 0,
- #define __take_second_arg(__ignored, val, ...) val
-