diff options
Diffstat (limited to 'tools/mkimage')
| -rw-r--r-- | tools/mkimage/patches/200-compiler-support.patch | 702 | ||||
| -rw-r--r-- | tools/mkimage/patches/200-gcc5_compat.patch | 87 |
2 files changed, 702 insertions, 87 deletions
diff --git a/tools/mkimage/patches/200-compiler-support.patch b/tools/mkimage/patches/200-compiler-support.patch new file mode 100644 index 0000000000..ca9c5b5a30 --- /dev/null +++ b/tools/mkimage/patches/200-compiler-support.patch @@ -0,0 +1,702 @@ +diff --git b/include/linux/compiler-gcc.h a/include/linux/compiler-gcc.h +index e057bd2..22ab246 100644 +--- b/include/linux/compiler-gcc.h ++++ a/include/linux/compiler-gcc.h +@@ -5,14 +5,28 @@ + /* + * Common definitions for all gcc versions go here. + */ +-#define GCC_VERSION (__GNUC__ * 10000 \ +- + __GNUC_MINOR__ * 100 \ +- + __GNUC_PATCHLEVEL__) +- ++#define GCC_VERSION (__GNUC__ * 10000 \ ++ + __GNUC_MINOR__ * 100 \ ++ + __GNUC_PATCHLEVEL__) + + /* Optimization barrier */ ++ + /* The "volatile" is due to gcc bugs */ + #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 ++ * normal barrier(): while gcc behavior gets along with a normal ++ * barrier(), llvm needs an explicit input variable to be assumed ++ * 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 ++ * 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") + + /* + * This macro obfuscates arithmetic on a variable address so that gcc +@@ -32,58 +46,63 @@ + * the inline assembly constraint from =g to =r, in this particular + * case either is valid. + */ +-#define RELOC_HIDE(ptr, off) \ +- ({ unsigned long __ptr; \ +- __asm__ ("" : "=r"(__ptr) : "0"(ptr)); \ +- (typeof(ptr)) (__ptr + (off)); }) ++#define RELOC_HIDE(ptr, off) \ ++({ \ ++ unsigned long __ptr; \ ++ __asm__ ("" : "=r"(__ptr) : "0"(ptr)); \ ++ (typeof(ptr)) (__ptr + (off)); \ ++}) + + /* Make the optimizer believe the variable can be manipulated arbitrarily. */ +-#define OPTIMIZER_HIDE_VAR(var) __asm__ ("" : "=r" (var) : "0" (var)) ++#define OPTIMIZER_HIDE_VAR(var) \ ++ __asm__ ("" : "=r" (var) : "0" (var)) + + #ifdef __CHECKER__ +-#define __must_be_array(arr) 0 ++#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])) ++#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: + */ +-#if !defined(CONFIG_ARCH_SUPPORTS_OPTIMIZED_INLINING) || \ ++#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 ++#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 inline inline notrace ++#define __inline__ __inline__ notrace ++#define __inline __inline notrace + #endif + +-#define __deprecated __attribute__((deprecated)) +-#ifndef __packed +-#define __packed __attribute__((packed)) +-#endif +-#ifndef __weak +-#define __weak __attribute__((weak)) +-#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. ++ * 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. + * +- * 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. ++ * 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 __naked __attribute__((naked)) noinline __noclone notrace + +-#define __noreturn __attribute__((noreturn)) ++#define __noreturn __attribute__((noreturn)) + + /* + * From the GCC manual: +@@ -95,34 +114,170 @@ + * would be. + * [...] + */ +-#ifndef __pure +-#define __pure __attribute__((pure)) ++#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 */ ++ ++#if GCC_VERSION >= 40500 ++/* ++ * 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() ++ ++/* 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 +-#ifndef __aligned +-#define __aligned(x) __attribute__((aligned(x))) ++ ++ ++#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 +-#define __printf(a, b) __attribute__((format(printf, a, b))) +-#define __scanf(a, b) __attribute__((format(scanf, a, b))) +-#define noinline __attribute__((noinline)) +-#define __attribute_const__ __attribute__((__const__)) +-#define __maybe_unused __attribute__((unused)) +-#define __always_unused __attribute__((unused)) + +-#define __gcc_header(x) #x +-#define _gcc_header(x) __gcc_header(linux/compiler-gcc##x.h) +-#define gcc_header(x) _gcc_header(x) +-#include gcc_header(__GNUC__) ++/* ++ * GCC 'asm goto' miscompiles certain code sequences: ++ * ++ * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58670 ++ * ++ * Work it around via a compiler barrier quirk suggested by Jakub Jelinek. ++ * ++ * (asm goto is automatically volatile - the naming reflects this.) ++ */ ++#define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) ++ ++#ifdef CONFIG_ARCH_USE_BUILTIN_BSWAP ++#if GCC_VERSION >= 40400 ++#define __HAVE_BUILTIN_BSWAP32__ ++#define __HAVE_BUILTIN_BSWAP64__ ++#endif ++#if GCC_VERSION >= 40800 || (defined(__powerpc__) && GCC_VERSION >= 40600) ++#define __HAVE_BUILTIN_BSWAP16__ ++#endif ++#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */ ++ ++#if 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 ++ */ ++#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) ++#define __no_sanitize_address ++#endif ++ + /* + * A trick to suppress uninitialized variable warning without generating any + * code + */ + #define uninitialized_var(x) x = x +- +-#ifndef __always_inline +-#define __always_inline inline __attribute__((always_inline)) +-#endif +diff --git b/include/linux/compiler-gcc3.h a/include/linux/compiler-gcc3.h +deleted file mode 100644 +index 7d89feb..0000000 +--- b/include/linux/compiler-gcc3.h ++++ /dev/null +@@ -1,23 +0,0 @@ +-#ifndef __LINUX_COMPILER_H +-#error "Please don't include <linux/compiler-gcc3.h> directly, include <linux/compiler.h> instead." +-#endif +- +-#if GCC_VERSION < 30200 +-# error Sorry, your compiler is too old - please upgrade it. +-#endif +- +-#if GCC_VERSION >= 30300 +-# define __used __attribute__((__used__)) +-#else +-# define __used __attribute__((__unused__)) +-#endif +- +-#if GCC_VERSION >= 30400 +-#define __must_check __attribute__((warn_unused_result)) +-#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 */ +diff --git b/include/linux/compiler-gcc4.h a/include/linux/compiler-gcc4.h +deleted file mode 100644 +index c982a09..0000000 +--- b/include/linux/compiler-gcc4.h ++++ /dev/null +@@ -1,81 +0,0 @@ +-#ifndef __LINUX_COMPILER_H +-#error "Please don't include <linux/compiler-gcc4.h> directly, include <linux/compiler.h> instead." +-#endif +- +-#define __used __attribute__((__used__)) +-#define __must_check __attribute__((warn_unused_result)) +-#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 */ +- +-#if GCC_VERSION >= 40500 +-/* +- * 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() +- +-/* Mark a function definition as prohibited from being cloned. */ +-#define __noclone __attribute__((__noclone__)) +- +-#endif /* GCC_VERSION >= 40500 */ +- +-#if GCC_VERSION >= 40600 +-/* +- * Tell the optimizer that something else uses this function or variable. +- */ +-#define __visible __attribute__((externally_visible)) +-#endif +- +-/* +- * GCC 'asm goto' miscompiles certain code sequences: +- * +- * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58670 +- * +- * Work it around via a compiler barrier quirk suggested by Jakub Jelinek. +- * Fixed in GCC 4.8.2 and later versions. +- * +- * (asm goto is automatically volatile - the naming reflects this.) +- */ +-#define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) +- +-#ifdef CONFIG_ARCH_USE_BUILTIN_BSWAP +-#if GCC_VERSION >= 40400 +-#define __HAVE_BUILTIN_BSWAP32__ +-#define __HAVE_BUILTIN_BSWAP64__ +-#endif +-#if GCC_VERSION >= 40800 || (defined(__powerpc__) && GCC_VERSION >= 40600) +-#define __HAVE_BUILTIN_BSWAP16__ +-#endif +-#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */ +diff --git b/include/linux/compiler-intel.h a/include/linux/compiler-intel.h +index ba147a1..d4c7113 100644 +--- b/include/linux/compiler-intel.h ++++ a/include/linux/compiler-intel.h +@@ -13,9 +13,14 @@ + /* Intel ECC compiler doesn't support gcc specific asm stmts. + * It uses intrinsics to do the equivalent things. + */ ++#undef barrier ++#undef barrier_data + #undef RELOC_HIDE + #undef OPTIMIZER_HIDE_VAR + ++#define barrier() __memory_barrier() ++#define barrier_data(ptr) barrier() ++ + #define RELOC_HIDE(ptr, off) \ + ({ unsigned long __ptr; \ + __ptr = (unsigned long) (ptr); \ +diff --git b/include/linux/compiler.h a/include/linux/compiler.h +index d5ad7b1..020ad16 100644 +--- b/include/linux/compiler.h ++++ a/include/linux/compiler.h +@@ -17,6 +17,7 @@ + # define __release(x) __context__(x,-1) + # define __cond_lock(x,c) ((c) ? ({ __acquire(x); 1; }) : 0) + # define __percpu __attribute__((noderef, address_space(3))) ++# define __pmem __attribute__((noderef, address_space(5))) + #ifdef CONFIG_SPARSE_RCU_POINTER + # define __rcu __attribute__((noderef, address_space(4))) + #else +@@ -42,6 +43,7 @@ extern void __chk_io_ptr(const volatile void __iomem *); + # define __cond_lock(x,c) (c) + # define __percpu + # define __rcu ++# define __pmem + #endif + + /* Indirect macros required for expanded argument pasting, eg. __LINE__. */ +@@ -54,7 +56,11 @@ extern void __chk_io_ptr(const volatile void __iomem *); + #include <linux/compiler-gcc.h> + #endif + ++#if defined(CC_USING_HOTPATCH) && !defined(__CHECKER__) ++#define notrace __attribute__((hotpatch(0,0))) ++#else + #define notrace __attribute__((no_instrument_function)) ++#endif + + /* Intel compiler defines __GNUC__. So we will overwrite implementations + * coming from above header files here +@@ -138,7 +144,7 @@ void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect); + */ + #define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) ) + #define __trace_if(cond) \ +- if (__builtin_constant_p((cond)) ? !!(cond) : \ ++ if (__builtin_constant_p(!!(cond)) ? !!(cond) : \ + ({ \ + int ______r; \ + static struct ftrace_branch_data \ +@@ -165,6 +171,10 @@ void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect); + # define barrier() __memory_barrier() + #endif + ++#ifndef barrier_data ++# define barrier_data(ptr) barrier() ++#endif ++ + /* Unreachable code */ + #ifndef unreachable + # define unreachable() do { } while (1) +@@ -186,6 +196,126 @@ void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect); + # define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __LINE__) + #endif + ++#include <linux/types.h> ++ ++#define __READ_ONCE_SIZE \ ++({ \ ++ switch (size) { \ ++ case 1: *(__u8 *)res = *(volatile __u8 *)p; break; \ ++ case 2: *(__u16 *)res = *(volatile __u16 *)p; break; \ ++ case 4: *(__u32 *)res = *(volatile __u32 *)p; break; \ ++ case 8: *(__u64 *)res = *(volatile __u64 *)p; break; \ ++ default: \ ++ barrier(); \ ++ __builtin_memcpy((void *)res, (const void *)p, size); \ ++ barrier(); \ ++ } \ ++}) ++ ++static __always_inline ++void __read_once_size(const volatile void *p, void *res, int size) ++{ ++ __READ_ONCE_SIZE; ++} ++ ++#ifdef CONFIG_KASAN ++/* ++ * This function is not 'inline' because __no_sanitize_address confilcts ++ * with inlining. Attempt to inline it may cause a build failure. ++ * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67368 ++ * '__maybe_unused' allows us to avoid defined-but-not-used warnings. ++ */ ++static __no_sanitize_address __maybe_unused ++void __read_once_size_nocheck(const volatile void *p, void *res, int size) ++{ ++ __READ_ONCE_SIZE; ++} ++#else ++static __always_inline ++void __read_once_size_nocheck(const volatile void *p, void *res, int size) ++{ ++ __READ_ONCE_SIZE; ++} ++#endif ++ ++static __always_inline void __write_once_size(volatile void *p, void *res, int size) ++{ ++ switch (size) { ++ case 1: *(volatile __u8 *)p = *(__u8 *)res; break; ++ case 2: *(volatile __u16 *)p = *(__u16 *)res; break; ++ case 4: *(volatile __u32 *)p = *(__u32 *)res; break; ++ case 8: *(volatile __u64 *)p = *(__u64 *)res; break; ++ default: ++ barrier(); ++ __builtin_memcpy((void *)p, (const void *)res, size); ++ barrier(); ++ } ++} ++ ++/* ++ * Prevent the compiler from merging or refetching reads or writes. The ++ * compiler is also forbidden from reordering successive instances of ++ * READ_ONCE, WRITE_ONCE and ACCESS_ONCE (see below), but only when the ++ * compiler is aware of some particular ordering. One way to make the ++ * compiler aware of ordering is to put the two invocations of READ_ONCE, ++ * WRITE_ONCE or ACCESS_ONCE() in different C statements. ++ * ++ * In contrast to ACCESS_ONCE these two macros will also work on aggregate ++ * data types like structs or unions. If the size of the accessed data ++ * type exceeds the word size of the machine (e.g., 32 bits or 64 bits) ++ * READ_ONCE() and WRITE_ONCE() will fall back to memcpy and print a ++ * compile-time warning. ++ * ++ * Their two major use cases are: (1) Mediating communication between ++ * process-level code and irq/NMI handlers, all running on the same CPU, ++ * and (2) Ensuring that the compiler does not fold, spindle, or otherwise ++ * mutilate accesses that either do not require ordering or that interact ++ * with an explicit memory barrier or atomic instruction that provides the ++ * required ordering. ++ */ ++ ++#define __READ_ONCE(x, check) \ ++({ \ ++ union { typeof(x) __val; char __c[1]; } __u; \ ++ if (check) \ ++ __read_once_size(&(x), __u.__c, sizeof(x)); \ ++ else \ ++ __read_once_size_nocheck(&(x), __u.__c, sizeof(x)); \ ++ __u.__val; \ ++}) ++#define READ_ONCE(x) __READ_ONCE(x, 1) ++ ++/* ++ * Use READ_ONCE_NOCHECK() instead of READ_ONCE() if you need ++ * to hide memory access from KASAN. ++ */ ++#define READ_ONCE_NOCHECK(x) __READ_ONCE(x, 0) ++ ++#define WRITE_ONCE(x, val) \ ++({ \ ++ union { typeof(x) __val; char __c[1]; } __u = \ ++ { .__val = (__force typeof(x)) (val) }; \ ++ __write_once_size(&(x), __u.__c, sizeof(x)); \ ++ __u.__val; \ ++}) ++ ++/** ++ * smp_cond_acquire() - Spin wait for cond with ACQUIRE ordering ++ * @cond: boolean expression to wait for ++ * ++ * Equivalent to using smp_load_acquire() on the condition variable but employs ++ * the control dependency of the wait to reduce the barrier on many platforms. ++ * ++ * The control dependency provides a LOAD->STORE order, the additional RMB ++ * provides LOAD->LOAD order, together they provide LOAD->{LOAD,STORE} order, ++ * aka. ACQUIRE. ++ */ ++#define smp_cond_acquire(cond) do { \ ++ while (!(cond)) \ ++ cpu_relax(); \ ++ smp_rmb(); /* ctrl + rmb := acquire */ \ ++} while (0) ++ + #endif /* __KERNEL__ */ + + #endif /* __ASSEMBLY__ */ +@@ -304,6 +434,14 @@ void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect); + #define __visible + #endif + ++/* ++ * Assume alignment of return value. ++ */ ++#ifndef __assume_aligned ++#define __assume_aligned(a, ...) ++#endif ++ ++ + /* Are two types/vars the same type (ignoring qualifiers)? */ + #ifndef __same_type + # define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b)) +@@ -311,7 +449,7 @@ void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect); + + /* Is this type a native word size -- useful for atomic operations */ + #ifndef __native_word +-# define __native_word(t) (sizeof(t) == sizeof(int) || sizeof(t) == sizeof(long)) ++# define __native_word(t) (sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || sizeof(t) == sizeof(int) || sizeof(t) == sizeof(long)) + #endif + + /* Compile time object size, -1 for unknown */ +@@ -373,12 +511,38 @@ void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect); + * to make the compiler aware of ordering is to put the two invocations of + * ACCESS_ONCE() in different C statements. + * +- * This macro does absolutely -nothing- to prevent the CPU from reordering, +- * merging, or refetching absolutely anything at any time. Its main intended +- * use is to mediate communication between process-level code and irq/NMI +- * handlers, all running on the same CPU. ++ * ACCESS_ONCE will only work on scalar types. For union types, ACCESS_ONCE ++ * on a union member will work as long as the size of the member matches the ++ * size of the union and the size is smaller than word size. ++ * ++ * The major use cases of ACCESS_ONCE used to be (1) Mediating communication ++ * between process-level code and irq/NMI handlers, all running on the same CPU, ++ * and (2) Ensuring that the compiler does not fold, spindle, or otherwise ++ * mutilate accesses that either do not require ordering or that interact ++ * with an explicit memory barrier or atomic instruction that provides the ++ * required ordering. ++ * ++ * If possible use READ_ONCE()/WRITE_ONCE() instead. ++ */ ++#define __ACCESS_ONCE(x) ({ \ ++ __maybe_unused typeof(x) __var = (__force typeof(x)) 0; \ ++ (volatile typeof(x) *)&(x); }) ++#define ACCESS_ONCE(x) (*__ACCESS_ONCE(x)) ++ ++/** ++ * lockless_dereference() - safely load a pointer for later dereference ++ * @p: The pointer to load ++ * ++ * Similar to rcu_dereference(), but for situations where the pointed-to ++ * object's lifetime is managed by something other than RCU. That ++ * "something other" might be reference counting or simple immortality. + */ +-#define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x)) ++#define lockless_dereference(p) \ ++({ \ ++ typeof(p) _________p1 = READ_ONCE(p); \ ++ smp_read_barrier_depends(); /* Dependency order vs. p above. */ \ ++ (_________p1); \ ++}) + + /* Ignore/forbid kprobes attach on very low level functions marked by this attribute: */ + #ifdef CONFIG_KPROBES diff --git a/tools/mkimage/patches/200-gcc5_compat.patch b/tools/mkimage/patches/200-gcc5_compat.patch deleted file mode 100644 index 3ae76a7ff6..0000000000 --- a/tools/mkimage/patches/200-gcc5_compat.patch +++ /dev/null @@ -1,87 +0,0 @@ -From 478b02f1a7043b673565075ea5016376f3293b23 Mon Sep 17 00:00:00 2001 -From: Hans de Goede <hdegoede@redhat.com> -Date: Sat, 7 Feb 2015 22:52:40 +0100 -Subject: [PATCH] Add linux/compiler-gcc5.h to fix builds with gcc5 - -Add linux/compiler-gcc5/h from the kernel sources at: - -commit 5631b8fba640a4ab2f8a954f63a603fa34eda96b -Author: Steven Noonan <steven@uplinklabs.net> -Date: Sat Oct 25 15:09:42 2014 -0700 - - compiler/gcc4+: Remove inaccurate comment about 'asm goto' miscompiles - -Signed-off-by: Hans de Goede <hdegoede@redhat.com> ---- - include/linux/compiler-gcc5.h | 65 +++++++++++++++++++++++++++++++++++++++++ - 1 file changed, 65 insertions(+) - create mode 100644 include/linux/compiler-gcc5.h - ---- /dev/null -+++ b/include/linux/compiler-gcc5.h -@@ -0,0 +1,65 @@ -+#ifndef __LINUX_COMPILER_H -+#error "Please don't include <linux/compiler-gcc5.h> directly, include <linux/compiler.h> instead." -+#endif -+ -+#define __used __attribute__((__used__)) -+#define __must_check __attribute__((warn_unused_result)) -+#define __compiler_offsetof(a, b) __builtin_offsetof(a, b) -+ -+/* 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__ */ -+ -+/* -+ * 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() -+ -+/* Mark a function definition as prohibited from being cloned. */ -+#define __noclone __attribute__((__noclone__)) -+ -+/* -+ * Tell the optimizer that something else uses this function or variable. -+ */ -+#define __visible __attribute__((externally_visible)) -+ -+/* -+ * GCC 'asm goto' miscompiles certain code sequences: -+ * -+ * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58670 -+ * -+ * Work it around via a compiler barrier quirk suggested by Jakub Jelinek. -+ * -+ * (asm goto is automatically volatile - the naming reflects this.) -+ */ -+#define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) -+ -+#ifdef CONFIG_ARCH_USE_BUILTIN_BSWAP -+#define __HAVE_BUILTIN_BSWAP32__ -+#define __HAVE_BUILTIN_BSWAP64__ -+#define __HAVE_BUILTIN_BSWAP16__ -+#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */ |