Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 681d866..5e88e7e 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -23,8 +23,8 @@
#define __branch_check__(x, expect, is_constant) ({ \
long ______r; \
static struct ftrace_likely_data \
- __attribute__((__aligned__(4))) \
- __attribute__((section("_ftrace_annotated_branch"))) \
+ __aligned(4) \
+ __section(_ftrace_annotated_branch) \
______f = { \
.data.func = __func__, \
.data.file = __FILE__, \
@@ -53,23 +53,24 @@
* "Define 'is'", Bill Clinton
* "Define 'if'", Steven Rostedt
*/
-#define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) )
-#define __trace_if(cond) \
- if (__builtin_constant_p(!!(cond)) ? !!(cond) : \
- ({ \
- int ______r; \
- static struct ftrace_branch_data \
- __attribute__((__aligned__(4))) \
- __attribute__((section("_ftrace_branch"))) \
- ______f = { \
- .func = __func__, \
- .file = __FILE__, \
- .line = __LINE__, \
- }; \
- ______r = !!(cond); \
- ______f.miss_hit[______r]++; \
- ______r; \
- }))
+#define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
+
+#define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
+
+#define __trace_if_value(cond) ({ \
+ static struct ftrace_branch_data \
+ __aligned(4) \
+ __section(_ftrace_branch) \
+ __if_trace = { \
+ .func = __func__, \
+ .file = __FILE__, \
+ .line = __LINE__, \
+ }; \
+ (cond) ? \
+ (__if_trace.miss_hit[1]++,1) : \
+ (__if_trace.miss_hit[0]++,0); \
+})
+
#endif /* CONFIG_PROFILE_ALL_BRANCHES */
#else
@@ -115,16 +116,24 @@
".pushsection .discard.unreachable\n\t" \
".long 999b - .\n\t" \
".popsection\n\t"
+
+/* Annotate a C jump table to allow objtool to follow the code flow */
+#define __annotate_jump_table __section(.rodata..c_jump_table)
+
#else
#define annotate_reachable()
#define annotate_unreachable()
+#define __annotate_jump_table
#endif
#ifndef ASM_UNREACHABLE
# define ASM_UNREACHABLE
#endif
#ifndef unreachable
-# define unreachable() do { annotate_reachable(); do { } while (1); } while (0)
+# define unreachable() do { \
+ annotate_unreachable(); \
+ __builtin_unreachable(); \
+} while (0)
#endif
/*
@@ -146,7 +155,7 @@
extern typeof(sym) sym; \
static const unsigned long __kentry_##sym \
__used \
- __attribute__((section("___kentry" "+" #sym ), used)) \
+ __section("___kentry" "+" #sym ) \
= (unsigned long)&sym;
#endif
@@ -158,7 +167,9 @@
#endif
#ifndef OPTIMIZER_HIDE_VAR
-#define OPTIMIZER_HIDE_VAR(var) barrier()
+/* Make the optimizer believe the variable can be manipulated arbitrarily. */
+#define OPTIMIZER_HIDE_VAR(var) \
+ __asm__ ("" : "=r" (var) : "0" (var))
#endif
/* Not-quite-unique ID. */
@@ -195,7 +206,7 @@
* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67368
* '__maybe_unused' allows us to avoid defined-but-not-used warnings.
*/
-# define __no_kasan_or_inline __no_sanitize_address __maybe_unused
+# define __no_kasan_or_inline __no_sanitize_address notrace __maybe_unused
#else
# define __no_kasan_or_inline __always_inline
#endif
@@ -287,7 +298,7 @@
* visible to the compiler.
*/
#define __ADDRESSABLE(sym) \
- static void * __attribute__((section(".discard.addressable"), used)) \
+ static void * __section(.discard.addressable) __used \
__PASTE(__addressable_##sym, __LINE__) = (void *)&sym;
/**
@@ -301,10 +312,6 @@
#endif /* __ASSEMBLY__ */
-#ifndef __optimize
-# define __optimize(level)
-#endif
-
/* Compile time object size, -1 for unknown */
#ifndef __compiletime_object_size
# define __compiletime_object_size(obj) -1
@@ -314,29 +321,14 @@
#endif
#ifndef __compiletime_error
# define __compiletime_error(message)
-/*
- * Sparse complains of variable sized arrays due to the temporary variable in
- * __compiletime_assert. Unfortunately we can't just expand it out to make
- * sparse see a constant array size without breaking compiletime_assert on old
- * versions of GCC (e.g. 4.2.4), so hide the array from sparse altogether.
- */
-# ifndef __CHECKER__
-# define __compiletime_error_fallback(condition) \
- do { ((void)sizeof(char[1 - 2 * condition])); } while (0)
-# endif
-#endif
-#ifndef __compiletime_error_fallback
-# define __compiletime_error_fallback(condition) do { } while (0)
#endif
#ifdef __OPTIMIZE__
# define __compiletime_assert(condition, msg, prefix, suffix) \
do { \
- int __cond = !(condition); \
extern void prefix ## suffix(void) __compiletime_error(msg); \
- if (__cond) \
+ if (!(condition)) \
prefix ## suffix(); \
- __compiletime_error_fallback(__cond); \
} while (0)
#else
# define __compiletime_assert(condition, msg, prefix, suffix) do { } while (0)
@@ -361,4 +353,7 @@
compiletime_assert(__native_word(t), \
"Need native word sized stores/loads for atomicity.")
+/* &a[0] degrades to a pointer: a different type from an array */
+#define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
+
#endif /* __LINUX_COMPILER_H */