The patch titled
Subject: include/linux/compiler-gcc.h: improve __visible documentation
has been added to the -mm tree. Its filename is
include-linux-compiler-gcch-improve-__visible-documentation.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/include-linux-compiler-gcch-improve-__visible-documentation.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/include-linux-compiler-gcch-improve-__visible-documentation.patch
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------------------------------------------------------
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Subject: include/linux/compiler-gcc.h: improve __visible documentation
Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/compiler-gcc.h | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff -puN include/linux/compiler-gcc.h~include-linux-compiler-gcch-improve-__visible-documentation include/linux/compiler-gcc.h
--- a/include/linux/compiler-gcc.h~include-linux-compiler-gcch-improve-__visible-documentation
+++ a/include/linux/compiler-gcc.h
@@ -205,7 +205,10 @@
#if GCC_VERSION >= 40600
/*
- * Tell the optimizer that something else uses this function or variable.
+ * When used with Link Time Optimization, gcc can optimize away C functions or
+ * variables which are referenced only from assembly code. __visible tells the
+ * optimizer that something else uses this function or variable, thus preventing
+ * this.
*/
#define __visible __attribute__((externally_visible))
#endif
_
Patches currently in -mm which might be from akpm@xxxxxxxxxxxxxxxxxxxx are
arch-alpha-kernel-systblss-remove-debug-check.patch
drivers-gpu-drm-i915-intel_spritec-fix-build.patch
drivers-gpu-drm-i915-intel_tvc-fix-build.patch
mm-dax-vma-with-vm_ops-pfn_mkwrite-wants-to-be-write-notified-fix.patch
x86-efi-kasan-undef-memset-memcpy-memmove-per-arch-fix.patch
mm.patch
uaccess-reimplement-probe_kernel_address-using-probe_kernel_read.patch
uaccess-reimplement-probe_kernel_address-using-probe_kernel_read-fix.patch
uaccess-reimplement-probe_kernel_address-using-probe_kernel_read-fix-fix.patch
kasan-various-fixes-in-documentation-checkpatch-fixes.patch
page-flags-introduce-page-flags-policies-wrt-compound-pages-fix.patch
include-linux-page-flagsh-rename-macros-to-avoid-collisions.patch
x86-add-pmd_-for-thp-fix.patch
sparc-add-pmd_-for-thp-fix.patch
mm-support-madvisemadv_free-fix-2.patch
mm-dont-split-thp-page-when-syscall-is-called-fix-3.patch
mm-move-lazy-free-pages-to-inactive-list-fix-fix.patch
remove-abs64.patch
include-linux-compiler-gcch-improve-__visible-documentation.patch
do_shared_fault-check-that-mmap_sem-is-held.patch
kernel-forkc-export-kernel_thread-to-modules.patch
slab-leaks3-default-y.patch
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