The patch titled
Subject: compiler.h: add __visible
has been added to the -mm tree. Its filename is
compilerh-add-__visible.patch
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------------------------------------------------------
From: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Subject: compiler.h: add __visible
gcc 4.6+ has support for a externally_visible attribute that prevents the
optimizer from optimizing unused symbols away. Add a __visible macro to
use it with that compiler version or later.
This is used (at least) by the "Link Time Optimization" patchset.
Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/compiler-gcc4.h | 7 +++++++
include/linux/compiler.h | 4 ++++
2 files changed, 11 insertions(+)
diff -puN include/linux/compiler-gcc4.h~compilerh-add-__visible include/linux/compiler-gcc4.h
--- a/include/linux/compiler-gcc4.h~compilerh-add-__visible
+++ a/include/linux/compiler-gcc4.h
@@ -49,6 +49,13 @@
#endif
#endif
+#if __GNUC_MINOR__ >= 6
+/*
+ * Tell the optimizer that something else uses this function or variable.
+ */
+#define __visible __attribute__((externally_visible))
+#endif
+
#if __GNUC_MINOR__ > 0
#define __compiletime_object_size(obj) __builtin_object_size(obj, 0)
#endif
diff -puN include/linux/compiler.h~compilerh-add-__visible include/linux/compiler.h
--- a/include/linux/compiler.h~compilerh-add-__visible
+++ a/include/linux/compiler.h
@@ -278,6 +278,10 @@ void ftrace_likely_update(struct ftrace_
# define __section(S) __attribute__ ((__section__(#S)))
#endif
+#ifndef __visible
+#define __visible
+#endif
+
/* Are two types/vars the same type (ignoring qualifiers)? */
#ifndef __same_type
# define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
_
Patches currently in -mm which might be from ak@xxxxxxxxxxxxxxx are
compilerh-add-__visible.patch
linux-next.patch
thp-x86-introduce-have_arch_transparent_hugepage.patch
thp-remove-assumptions-on-pgtable_t-type.patch
thp-introduce-pmdp_invalidate.patch
thp-make-madv_hugepage-check-for-mm-def_flags.patch
thp-s390-thp-splitting-backend-for-s390.patch
thp-s390-thp-pagetable-pre-allocation-for-s390.patch
thp-s390-disable-thp-for-kvm-host-on-s390.patch
thp-s390-architecture-backend-for-thp-on-s390.patch
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