compiler*.h: sync include/linux/compiler*.h with Linux 5.7-rc5
Copy these from Linux v5.7-rc5 tag.
This brings in some handy new attributes and is otherwise important to
keep in sync.
We drop the reference to smp_read_barrier_depends() as it is not
relevant on the architectures we support at this time, based on where
it's implemented in Linux today. We drop the call to kasan_check_read()
as that is not relevant to U-Boot as well.
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
index 8d9e079..d7ee4c6 100644
--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -1,4 +1,5 @@
-#ifndef __LINUX_COMPILER_H
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __LINUX_COMPILER_TYPES_H
#error "Please don't include <linux/compiler-gcc.h> directly, include <linux/compiler.h> instead."
#endif
@@ -9,11 +10,14 @@
+ __GNUC_MINOR__ * 100 \
+ __GNUC_PATCHLEVEL__)
+#if GCC_VERSION < 40600
+# error Sorry, your compiler is too old - please upgrade it.
+#endif
+
/* Optimization barrier */
/* The "volatile" is due to gcc bugs */
-#define barrier() \
- __asm__ __volatile__("": : :"memory")
+#define barrier() __asm__ __volatile__("": : :"memory")
/*
* This version is i.e. to prevent dead stores elimination on @ptr
* where gcc and llvm may behave differently when otherwise using
@@ -22,13 +26,12 @@
* clobbered. The issue is as follows: while the inline asm might
* access any memory it wants, the compiler could have fit all of
* @ptr into memory registers instead, and since @ptr never escaped
- * from that, it proofed that the inline asm wasn't touching any of
+ * from that, it proved that the inline asm wasn't touching any of
* it. This version works well with both compilers, i.e. we're telling
* the compiler that the inline asm absolutely may see the contents
* of @ptr. See also: https://llvm.org/bugs/show_bug.cgi?id=15495
*/
-#define barrier_data(ptr) \
- __asm__ __volatile__("": :"r"(ptr) :"memory")
+#define barrier_data(ptr) __asm__ __volatile__("": :"r"(ptr) :"memory")
/*
* This macro obfuscates arithmetic on a variable address so that gcc
@@ -55,181 +58,54 @@
(typeof(ptr)) (__ptr + (off)); \
})
-/* Make the optimizer believe the variable can be manipulated arbitrarily. */
-#define OPTIMIZER_HIDE_VAR(var) \
- __asm__ ("" : "=r" (var) : "0" (var))
-
-#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
-
/*
- * Force always-inline if the user requests it so via the .config,
- * or if gcc is too old:
+ * A trick to suppress uninitialized variable warning without generating any
+ * code
*/
-#if !defined(CONFIG_ARCH_SUPPORTS_OPTIMIZED_INLINING) || \
- !defined(CONFIG_OPTIMIZE_INLINING) || (__GNUC__ < 4)
-#define inline inline __attribute__((always_inline)) notrace
-#define __inline__ __inline__ __attribute__((always_inline)) notrace
-#define __inline __inline __attribute__((always_inline)) notrace
-#else
-/* A lot of inline functions can cause havoc with function tracing */
-#define inline inline notrace
-#define __inline__ __inline__ notrace
-#define __inline __inline notrace
+#define uninitialized_var(x) x = x
+
+#ifdef CONFIG_RETPOLINE
+#define __noretpoline __attribute__((__indirect_branch__("keep")))
#endif
-#define __always_inline inline __attribute__((always_inline))
-#define noinline __attribute__((noinline))
-
-#define __deprecated __attribute__((deprecated))
-#define __packed __attribute__((packed))
-#define __weak __attribute__((weak))
-#define __alias(symbol) __attribute__((alias(#symbol)))
-
-/*
- * it doesn't make sense on ARM (currently the only user of __naked)
- * to trace naked functions because then mcount is called without
- * stack and frame pointer being set up and there is no chance to
- * restore the lr register to the value before mcount was called.
- *
- * The asm() bodies of naked functions often depend on standard calling
- * conventions, therefore they must be noinline and noclone.
- *
- * GCC 4.[56] currently fail to enforce this, so we must do so ourselves.
- * See GCC PR44290.
- */
-#define __naked __attribute__((naked)) noinline __noclone notrace
-
-#define __noreturn __attribute__((noreturn))
-
-/*
- * From the GCC manual:
- *
- * Many functions have no effects except the return value and their
- * return value depends only on the parameters and/or global
- * variables. Such a function can be subject to common subexpression
- * elimination and loop optimization just as an arithmetic operator
- * would be.
- * [...]
- */
-#define __pure __attribute__((pure))
-#define __aligned(x) __attribute__((aligned(x)))
-#define __printf(a, b) __attribute__((format(printf, a, b)))
-#define __scanf(a, b) __attribute__((format(scanf, a, b)))
-#define __attribute_const__ __attribute__((__const__))
-#define __maybe_unused __attribute__((unused))
-#define __always_unused __attribute__((unused))
-
-/* gcc version specific checks */
-
-#if GCC_VERSION < 30200
-# error Sorry, your compiler is too old - please upgrade it.
-#endif
-
-#if GCC_VERSION < 30300
-# define __used __attribute__((__unused__))
-#else
-# define __used __attribute__((__used__))
-#endif
-
-#ifdef CONFIG_GCOV_KERNEL
-# if GCC_VERSION < 30400
-# error "GCOV profiling support for gcc versions below 3.4 not included"
-# endif /* __GNUC_MINOR__ */
-#endif /* CONFIG_GCOV_KERNEL */
-
-#if GCC_VERSION >= 30400
-#define __must_check __attribute__((warn_unused_result))
-#endif
-
-#if GCC_VERSION >= 40000
-
-/* GCC 4.1.[01] miscompiles __weak */
-#ifdef __KERNEL__
-# if GCC_VERSION >= 40100 && GCC_VERSION <= 40101
-# error Your version of gcc miscompiles the __weak directive
-# endif
-#endif
-
-#define __used __attribute__((__used__))
-#define __compiler_offsetof(a, b) \
- __builtin_offsetof(a, b)
-
-#if GCC_VERSION >= 40100 && GCC_VERSION < 40600
-# define __compiletime_object_size(obj) __builtin_object_size(obj, 0)
-#endif
-
-#if GCC_VERSION >= 40300
-/* Mark functions as cold. gcc will assume any path leading to a call
- * to them will be unlikely. This means a lot of manual unlikely()s
- * are unnecessary now for any paths leading to the usual suspects
- * like BUG(), printk(), panic() etc. [but let's keep them for now for
- * older compilers]
- *
- * Early snapshots of gcc 4.3 don't support this and we can't detect this
- * in the preprocessor, but we can live with this because they're unreleased.
- * Maketime probing would be overkill here.
- *
- * gcc also has a __attribute__((__hot__)) to move hot functions into
- * a special section, but I don't see any sense in this right now in
- * the kernel context
- */
-#define __cold __attribute__((__cold__))
-
#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
-#ifndef __CHECKER__
-# define __compiletime_warning(message) __attribute__((warning(message)))
-# define __compiletime_error(message) __attribute__((error(message)))
-#endif /* __CHECKER__ */
-#endif /* GCC_VERSION >= 40300 */
+#define __compiletime_object_size(obj) __builtin_object_size(obj, 0)
-#if GCC_VERSION >= 40500
+#define __compiletime_warning(message) __attribute__((__warning__(message)))
+#define __compiletime_error(message) __attribute__((__error__(message)))
+
+#if defined(LATENT_ENTROPY_PLUGIN) && !defined(__CHECKER__)
+#define __latent_entropy __attribute__((latent_entropy))
+#endif
+
+/*
+ * calling noreturn functions, __builtin_unreachable() and __builtin_trap()
+ * confuse the stack allocation in gcc, leading to overly large stack
+ * frames, see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82365
+ *
+ * Adding an empty inline assembly before it works around the problem
+ */
+#define barrier_before_unreachable() asm volatile("")
+
/*
* 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() __builtin_unreachable()
+#define unreachable() \
+ do { \
+ annotate_unreachable(); \
+ barrier_before_unreachable(); \
+ __builtin_unreachable(); \
+ } while (0)
-/* Mark a function definition as prohibited from being cloned. */
-#define __noclone __attribute__((__noclone__))
-
-#endif /* GCC_VERSION >= 40500 */
-
-#if GCC_VERSION >= 40600
-/*
- * 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
-
-
-#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__)))
+#if defined(RANDSTRUCT_PLUGIN) && !defined(__CHECKER__)
+#define __randomize_layout __attribute__((randomize_layout))
+#define __no_randomize_layout __attribute__((no_randomize_layout))
+/* This anon struct can add padding, so only enable it under randstruct. */
+#define randomized_struct_fields_start struct {
+#define randomized_struct_fields_end } __randomize_layout;
#endif
/*
@@ -243,43 +119,56 @@
*/
#define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0)
-#ifdef CONFIG_ARCH_USE_BUILTIN_BSWAP
-#if GCC_VERSION >= 40400
+/*
+ * sparse (__CHECKER__) pretends to be gcc, but can't do constant
+ * folding in __builtin_bswap*() (yet), so don't set these for it.
+ */
+#if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP) && !defined(__CHECKER__)
#define __HAVE_BUILTIN_BSWAP32__
#define __HAVE_BUILTIN_BSWAP64__
-#endif
-#if GCC_VERSION >= 40800 || (defined(__powerpc__) && GCC_VERSION >= 40600)
+#if GCC_VERSION >= 40800
#define __HAVE_BUILTIN_BSWAP16__
#endif
-#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */
+#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP && !__CHECKER__ */
-#if GCC_VERSION >= 50000
+#if GCC_VERSION >= 70000
+#define KASAN_ABI_VERSION 5
+#elif GCC_VERSION >= 50000
#define KASAN_ABI_VERSION 4
#elif GCC_VERSION >= 40902
#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
- */
+#if __has_attribute(__no_sanitize_address__)
#define __no_sanitize_address __attribute__((no_sanitize_address))
-#endif
-
-#endif /* gcc version >= 40000 specific checks */
-
-#if !defined(__noclone)
-#define __noclone /* not needed */
-#endif
-
-#if !defined(__no_sanitize_address)
+#else
#define __no_sanitize_address
#endif
+#if GCC_VERSION >= 50100
+#define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
+#endif
+
/*
- * A trick to suppress uninitialized variable warning without generating any
- * code
+ * Turn individual warnings and errors on and off locally, depending
+ * on version.
*/
-#define uninitialized_var(x) x = x
+#define __diag_GCC(version, severity, s) \
+ __diag_GCC_ ## version(__diag_GCC_ ## severity s)
+
+/* Severity used in pragma directives */
+#define __diag_GCC_ignore ignored
+#define __diag_GCC_warn warning
+#define __diag_GCC_error error
+
+#define __diag_str1(s) #s
+#define __diag_str(s) __diag_str1(s)
+#define __diag(s) _Pragma(__diag_str(GCC diagnostic s))
+
+#if GCC_VERSION >= 80000
+#define __diag_GCC_8(s) __diag(s)
+#else
+#define __diag_GCC_8(s)
+#endif
+
+#define __no_fgcse __attribute__((optimize("-fno-gcse")))