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HACK: init: ensure initcall ordering with LTO

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With LTO, LLVM sorts initcalls in a single translation unit alphabetically
based on the name of the function (or actually, the variable stored in
the initcall section). Use __COUNTER__ in the variable name in an attempt
to preserve the intended order.

Bug: 62093296
Bug: 67506682
Change-Id: I4fa3cb93cba967a1440ac53328eb6b8ac649ff36
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
This commit is contained in:
Sami Tolvanen
2017-12-08 15:49:24 -08:00
parent aadfde875d
commit b13cf8585d
1 changed files with 10 additions and 1 deletions
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11
include/linux/init.h
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@@ -147,6 +147,15 @@ extern bool initcall_debug;
#ifndef __ASSEMBLY__
#ifdef CONFIG_LTO_CLANG
/* prepend the variable name with __COUNTER__ to ensure correct ordering */
#define ___initcall_name2(c, fn, id) __initcall_##c##_##fn##id
#define ___initcall_name1(c, fn, id) ___initcall_name2(c, fn, id)
#define __initcall_name(fn, id) ___initcall_name1(__COUNTER__, fn, id)
#else
#define __initcall_name(fn, id) __initcall_##fn##id
#endif
/*
* initcalls are now grouped by functionality into separate
* subsections. Ordering inside the subsections is determined
@@ -164,7 +173,7 @@ extern bool initcall_debug;
*/
#define __define_initcall(fn, id) \
static initcall_t __initcall_##fn##id __used \
static initcall_t __initcall_name(fn, id) __used \
__attribute__((__section__(".initcall" #id ".init"))) = fn;
/*