Merge tag 'compiler-attributes-for-linus-4.20-rc1' of https://github.com/ojeda/linux

[sfrench/cifs-2.6.git] / include / linux / compiler-gcc.h

diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
index 90ddfefb6c2b12886acba122a6d2e79e99951f82..c0f5db3a962174953a0e8bf19873b7a22334448d 100644 (file)
--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -68,31 +68,20 @@
  */
 #define uninitialized_var(x) x = x
 
-#ifdef __CHECKER__
-#define __must_be_array(a)     0
-#else
-/* &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
-
 #ifdef RETPOLINE
-#define __noretpoline __attribute__((indirect_branch("keep")))
+#define __noretpoline __attribute__((__indirect_branch__("keep")))
 #endif
 
 #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
 
-#define __optimize(level)      __attribute__((__optimize__(level)))
-
 #define __compiletime_object_size(obj) __builtin_object_size(obj, 0)
 
-#ifndef __CHECKER__
-#define __compiletime_warning(message) __attribute__((warning(message)))
-#define __compiletime_error(message) __attribute__((error(message)))
+#define __compiletime_warning(message) __attribute__((__warning__(message)))
+#define __compiletime_error(message) __attribute__((__error__(message)))
 
-#ifdef LATENT_ENTROPY_PLUGIN
+#if defined(LATENT_ENTROPY_PLUGIN) && !defined(__CHECKER__)
 #define __latent_entropy __attribute__((latent_entropy))
 #endif
-#endif /* __CHECKER__ */
 
 /*
  * calling noreturn functions, __builtin_unreachable() and __builtin_trap()
@@ -107,10 +96,6 @@
  * Mark a position in code as unreachable.  This can be used to
  * suppress control flow warnings after asm blocks that transfer
  * control elsewhere.
- *
- * Early snapshots of gcc 4.5 don't support this and we can't detect
- * this in the preprocessor, but we can live with this because they're
- * unreleased.  Really, we need to have autoconf for the kernel.
  */
 #define unreachable() \
        do {                                    \
@@ -119,9 +104,6 @@
                __builtin_unreachable();        \
        } while (0)
 
-/* Mark a function definition as prohibited from being cloned. */
-#define __noclone      __attribute__((__noclone__, __optimize__("no-tracer")))
-
 #if defined(RANDSTRUCT_PLUGIN) && !defined(__CHECKER__)
 #define __randomize_layout __attribute__((randomize_layout))
 #define __no_randomize_layout __attribute__((no_randomize_layout))
@@ -130,32 +112,6 @@
 #define randomized_struct_fields_end   } __randomize_layout;
 #endif
 
-/*
- * 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))
-
-/* gcc version specific checks */
-
-#if GCC_VERSION >= 40900 && !defined(__CHECKER__)
-/*
- * __assume_aligned(n, k): Tell the optimizer that the returned
- * pointer can be assumed to be k modulo n. The second argument is
- * optional (default 0), so we use a variadic macro to make the
- * shorthand.
- *
- * Beware: Do not apply this to functions which may return
- * ERR_PTRs. Also, it is probably unwise to apply it to functions
- * returning extra information in the low bits (but in that case the
- * compiler should see some alignment anyway, when the return value is
- * massaged by 'flags = ptr & 3; ptr &= ~3;').
- */
-#define __assume_aligned(a, ...) __attribute__((__assume_aligned__(a, ## __VA_ARGS__)))
-#endif
-
 /*
  * GCC 'asm goto' miscompiles certain code sequences:
  *
@@ -187,39 +143,22 @@
 #define KASAN_ABI_VERSION 3
 #endif
 
-#if GCC_VERSION >= 40902
 /*
- * Tell the compiler that address safety instrumentation (KASAN)
- * should not be applied to that function.
- * Conflicts with inlining: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67368
+ * Because __no_sanitize_address conflicts with inlining:
+ *   https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67368
+ * we do one or the other. 
  */
-#define __no_sanitize_address __attribute__((no_sanitize_address))
 #ifdef CONFIG_KASAN
 #define __no_sanitize_address_or_inline                                        \
        __no_sanitize_address __maybe_unused notrace
 #else
 #define __no_sanitize_address_or_inline inline
 #endif
-#endif
 
 #if GCC_VERSION >= 50100
-/*
- * Mark structures as requiring designated initializers.
- * https://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html
- */
-#define __designated_init __attribute__((designated_init))
 #define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
 #endif
 
-#if !defined(__noclone)
-#define __noclone      /* not needed */
-#endif
-
-#if !defined(__no_sanitize_address)
-#define __no_sanitize_address
-#define __no_sanitize_address_or_inline inline
-#endif
-
 /*
  * Turn individual warnings and errors on and off locally, depending
  * on version.