Remove Intel compiler support

include/linux/compiler-intel.h had no update in the past 3 years.

We often forget about the third C compiler to build the kernel.

For example, commit a0a12c3ed057 ("asm goto: eradicate CC_HAS_ASM_GOTO")
only mentioned GCC and Clang.

init/Kconfig defines CC_IS_GCC and CC_IS_CLANG but not CC_IS_ICC,
and nobody has reported any issue.

I guess the Intel Compiler support is broken, and nobody is caring
about it.

Harald Arnesen pointed out ICC (classic Intel C/C++ compiler) is
deprecated:

    $ icc -v
    icc: remark #10441: The Intel(R) C++ Compiler Classic (ICC) is
    deprecated and will be removed from product release in the second half
    of 2023. The Intel(R) oneAPI DPC++/C++ Compiler (ICX) is the recommended
    compiler moving forward. Please transition to use this compiler. Use
    '-diag-disable=10441' to disable this message.
    icc version 2021.7.0 (gcc version 12.1.0 compatibility)

Arnd Bergmann provided a link to the article, "Intel C/C++ compilers
complete adoption of LLVM".

lib/zstd/common/compiler.h and lib/zstd/compress/zstd_fast.c were kept
untouched for better sync with https://github.com/facebook/zstd

Link: https://www.intel.com/content/www/us/en/developer/articles/technical/adoption-of-llvm-complete-icx.html
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Miguel Ojeda <ojeda@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

6 files changed, 3 insertions, 109 deletions

diff --git a/include/acpi/platform/acenv.h b/include/acpi/platform/acenv.h
index 03eb3d977075..9e4f7564201a 100644
--- a/include/acpi/platform/acenv.h
+++ b/include/acpi/platform/acenv.h
@@ -148,15 +148,12 @@
  *
  *****************************************************************************/
 
-#if defined(__GNUC__) && !defined(__INTEL_COMPILER)
+#if defined(__GNUC__)
 #include <acpi/platform/acgcc.h>
 
 #elif defined(_MSC_VER)
 #include "acmsvc.h"
 
-#elif defined(__INTEL_COMPILER)
-#include <acpi/platform/acintel.h>
-
 #endif
 
 #if defined(_LINUX) || defined(__linux__)
diff --git a/include/acpi/platform/acenvex.h b/include/acpi/platform/acenvex.h
index 3a6b1db9a984..72cc7bab469e 100644
--- a/include/acpi/platform/acenvex.h
+++ b/include/acpi/platform/acenvex.h
@@ -35,7 +35,7 @@
 
 #endif
 
-#if defined(__GNUC__) && !defined(__INTEL_COMPILER)
+#if defined(__GNUC__)
 #include "acgccex.h"
 
 #elif defined(_MSC_VER)
diff --git a/include/acpi/platform/acintel.h b/include/acpi/platform/acintel.h
deleted file mode 100644
index 85b1ae86ee63..000000000000
--- a/include/acpi/platform/acintel.h
+++ /dev/null
@@ -1,55 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 */
-/******************************************************************************
- *
- * Name: acintel.h - VC specific defines, etc.
- *
- * Copyright (C) 2000 - 2022, Intel Corp.
- *
- *****************************************************************************/
-
-#ifndef __ACINTEL_H__
-#define __ACINTEL_H__
-
-/*
- * Use compiler specific <stdarg.h> is a good practice for even when
- * -nostdinc is specified (i.e., ACPI_USE_STANDARD_HEADERS undefined.
- */
-#ifndef va_arg
-#include <stdarg.h>
-#endif
-
-/* Configuration specific to Intel 64-bit C compiler */
-
-#define COMPILER_DEPENDENT_INT64    __int64
-#define COMPILER_DEPENDENT_UINT64   unsigned __int64
-#define ACPI_INLINE                 __inline
-
-/*
- * Calling conventions:
- *
- * ACPI_SYSTEM_XFACE        - Interfaces to host OS (handlers, threads)
- * ACPI_EXTERNAL_XFACE      - External ACPI interfaces
- * ACPI_INTERNAL_XFACE      - Internal ACPI interfaces
- * ACPI_INTERNAL_VAR_XFACE  - Internal variable-parameter list interfaces
- */
-#define ACPI_SYSTEM_XFACE
-#define ACPI_EXTERNAL_XFACE
-#define ACPI_INTERNAL_XFACE
-#define ACPI_INTERNAL_VAR_XFACE
-
-/* remark 981 - operands evaluated in no particular order */
-#pragma warning(disable:981)
-
-/* warn C4100: unreferenced formal parameter */
-#pragma warning(disable:4100)
-
-/* warn C4127: conditional expression is constant */
-#pragma warning(disable:4127)
-
-/* warn C4706: assignment within conditional expression */
-#pragma warning(disable:4706)
-
-/* warn C4214: bit field types other than int */
-#pragma warning(disable:4214)
-
-#endif				/* __ACINTEL_H__ */
diff --git a/include/linux/compiler-intel.h b/include/linux/compiler-intel.h
deleted file mode 100644
index b17f3cd18334..000000000000
--- a/include/linux/compiler-intel.h
+++ /dev/null
@@ -1,34 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef __LINUX_COMPILER_TYPES_H
-#error "Please don't include <linux/compiler-intel.h> directly, include <linux/compiler.h> instead."
-#endif
-
-#ifdef __ECC
-
-/* Compiler specific definitions for Intel ECC compiler */
-
-#include <asm/intrinsics.h>
-
-/* Intel ECC compiler doesn't support gcc specific asm stmts.
- * It uses intrinsics to do the equivalent things.
- */
-
-#define barrier() __memory_barrier()
-#define barrier_data(ptr) barrier()
-
-#define RELOC_HIDE(ptr, off)					\
-  ({ unsigned long __ptr;					\
-     __ptr = (unsigned long) (ptr);				\
-    (typeof(ptr)) (__ptr + (off)); })
-
-/* This should act as an optimization barrier on var.
- * Given that this compiler does not have inline assembly, a compiler barrier
- * is the best we can do.
- */
-#define OPTIMIZER_HIDE_VAR(var) barrier()
-
-#endif
-
-/* icc has this, but it's called _bswap16 */
-#define __HAVE_BUILTIN_BSWAP16__
-#define __builtin_bswap16 _bswap16
diff --git a/include/linux/compiler_attributes.h b/include/linux/compiler_attributes.h
index 4a3bd114a24f..e659cb6fded3 100644
--- a/include/linux/compiler_attributes.h
+++ b/include/linux/compiler_attributes.h
@@ -64,16 +64,10 @@
  * compiler should see some alignment anyway, when the return value is
  * massaged by 'flags = ptr & 3; ptr &= ~3;').
  *
- * Optional: not supported by icc
- *
  *   gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-assume_005faligned-function-attribute
  * clang: https://clang.llvm.org/docs/AttributeReference.html#assume-aligned
  */
-#if __has_attribute(__assume_aligned__)
-# define __assume_aligned(a, ...)       __attribute__((__assume_aligned__(a, ## __VA_ARGS__)))
-#else
-# define __assume_aligned(a, ...)
-#endif
+#define __assume_aligned(a, ...)        __attribute__((__assume_aligned__(a, ## __VA_ARGS__)))
 
 /*
  * Note the long name.
@@ -85,7 +79,6 @@
 /*
  * Optional: only supported since gcc >= 9
  * Optional: not supported by clang
- * Optional: not supported by icc
  *
  *   gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-copy-function-attribute
  */
@@ -98,7 +91,6 @@
 /*
  * Optional: not supported by gcc
  * Optional: only supported since clang >= 14.0
- * Optional: not supported by icc
  *
  * clang: https://clang.llvm.org/docs/AttributeReference.html#diagnose_as_builtin
  */
@@ -122,7 +114,6 @@
 
 /*
  * Optional: not supported by clang
- * Optional: not supported by icc
  *
  *   gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Type-Attributes.html#index-designated_005finit-type-attribute
  */
@@ -236,7 +227,6 @@
 /*
  * Optional: only supported since gcc >= 8
  * Optional: not supported by clang
- * Optional: not supported by icc
  *
  *   gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html#index-nonstring-variable-attribute
  */
@@ -267,7 +257,6 @@
 
 /*
  * Optional: not supported by gcc.
- * Optional: not supported by icc.
  *
  * clang: https://clang.llvm.org/docs/AttributeReference.html#overloadable
  */
@@ -287,7 +276,6 @@
  * Note: the "type" argument should match any __builtin_object_size(p, type) usage.
  *
  * Optional: not supported by gcc.
- * Optional: not supported by icc.
  *
  * clang: https://clang.llvm.org/docs/AttributeReference.html#pass-object-size-pass-dynamic-object-size
  */
diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h
index 690c7c826fbf..547ea1ff806e 100644
--- a/include/linux/compiler_types.h
+++ b/include/linux/compiler_types.h
@@ -120,8 +120,6 @@ static inline void __chk_io_ptr(const volatile void __iomem *ptr) { }
 /* Compiler specific macros. */
 #ifdef __clang__
 #include <linux/compiler-clang.h>
-#elif defined(__INTEL_COMPILER)
-#include <linux/compiler-intel.h>
 #elif defined(__GNUC__)
 /* The above compilers also define __GNUC__, so order is important here. */
 #include <linux/compiler-gcc.h>