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From:   Masahiro Yamada <masahiroy@kernel.org>
To:     Linus Torvalds <torvalds@linux-foundation.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Dave Hansen <dave.hansen@linux.intel.com>, x86@kernel.org,
        "H . Peter Anvin" <hpa@zytor.com>
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-ia64@vger.kernel.org,
        Nick Desaulniers <ndesaulniers@google.com>,
        Miguel Ojeda <ojeda@kernel.org>,
        Masahiro Yamada <masahiroy@kernel.org>,
        Arnd Bergmann <arnd@arndb.de>, Len Brown <lenb@kernel.org>,
        Nathan Chancellor <nathan@kernel.org>,
        Nick Terrell <terrelln@fb.com>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        Robert Moore <robert.moore@intel.com>,
        Tom Rix <trix@redhat.com>, devel@acpica.org,
        linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org,
        llvm@lists.linux.dev
Subject: [PATCH v2] Remove Intel compiler support
Date:   Wed, 12 Oct 2022 02:14:27 +0900
Message-Id: <20221011171427.58891-1-masahiroy@kernel.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

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".

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>
---

Changes in v2:
  - Remove "not supported by icc." comments from compiler_attributes.h
  - Clean up __assume_aligned() macro
  - Add more info from Harald Arnesen and Arnd Bergmann

 arch/ia64/include/uapi/asm/cmpxchg.h      |   6 +-
 arch/ia64/include/uapi/asm/intel_intrin.h | 162 ----------------------
 arch/ia64/include/uapi/asm/intrinsics.h   |   6 +-
 include/acpi/platform/acenv.h             |   5 +-
 include/acpi/platform/acenvex.h           |   2 +-
 include/acpi/platform/acintel.h           |  55 --------
 include/linux/compiler-intel.h            |  34 -----
 include/linux/compiler_attributes.h       |  14 +-
 include/linux/compiler_types.h            |   2 -
 lib/zstd/common/compiler.h                |   2 +-
 lib/zstd/compress/zstd_fast.c             |   7 -
 scripts/cc-version.sh                     |   2 -
 scripts/min-tool-version.sh               |   4 -
 13 files changed, 6 insertions(+), 295 deletions(-)
 delete mode 100644 arch/ia64/include/uapi/asm/intel_intrin.h
 delete mode 100644 include/acpi/platform/acintel.h
 delete mode 100644 include/linux/compiler-intel.h

diff --git a/arch/ia64/include/uapi/asm/cmpxchg.h b/arch/ia64/include/uapi/asm/cmpxchg.h
index ca2e02685343..259ae57570bf 100644
--- a/arch/ia64/include/uapi/asm/cmpxchg.h
+++ b/arch/ia64/include/uapi/asm/cmpxchg.h
@@ -15,11 +15,7 @@
 #include <linux/types.h>
 /* include compiler specific intrinsics */
 #include <asm/ia64regs.h>
-#ifdef __INTEL_COMPILER
-# include <asm/intel_intrin.h>
-#else
-# include <asm/gcc_intrin.h>
-#endif
+#include <asm/gcc_intrin.h>
 
 /*
  * This function doesn't exist, so you'll get a linker error if
diff --git a/arch/ia64/include/uapi/asm/intel_intrin.h b/arch/ia64/include/uapi/asm/intel_intrin.h
deleted file mode 100644
index dc1884dc54b5..000000000000
--- a/arch/ia64/include/uapi/asm/intel_intrin.h
+++ /dev/null
@@ -1,162 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
-#ifndef _ASM_IA64_INTEL_INTRIN_H
-#define _ASM_IA64_INTEL_INTRIN_H
-/*
- * Intel Compiler Intrinsics
- *
- * Copyright (C) 2002,2003 Jun Nakajima <jun.nakajima@intel.com>
- * Copyright (C) 2002,2003 Suresh Siddha <suresh.b.siddha@intel.com>
- * Copyright (C) 2005,2006 Hongjiu Lu <hongjiu.lu@intel.com>
- *
- */
-#include <ia64intrin.h>
-
-#define ia64_barrier()		__memory_barrier()
-
-#define ia64_stop()	/* Nothing: As of now stop bit is generated for each
-		 	 * intrinsic
-		 	 */
-
-#define ia64_getreg		__getReg
-#define ia64_setreg		__setReg
-
-#define ia64_hint		__hint
-#define ia64_hint_pause		__hint_pause
-
-#define ia64_mux1_brcst		_m64_mux1_brcst
-#define ia64_mux1_mix		_m64_mux1_mix
-#define ia64_mux1_shuf		_m64_mux1_shuf
-#define ia64_mux1_alt		_m64_mux1_alt
-#define ia64_mux1_rev		_m64_mux1_rev
-
-#define ia64_mux1(x,v)		_m_to_int64(_m64_mux1(_m_from_int64(x), (v)))
-#define ia64_popcnt		_m64_popcnt
-#define ia64_getf_exp		__getf_exp
-#define ia64_shrp		_m64_shrp
-
-#define ia64_tpa		__tpa
-#define ia64_invala		__invala
-#define ia64_invala_gr		__invala_gr
-#define ia64_invala_fr		__invala_fr
-#define ia64_nop		__nop
-#define ia64_sum		__sum
-#define ia64_ssm		__ssm
-#define ia64_rum		__rum
-#define ia64_rsm		__rsm
-#define ia64_fc			__fc
-
-#define ia64_ldfs		__ldfs
-#define ia64_ldfd		__ldfd
-#define ia64_ldfe		__ldfe
-#define ia64_ldf8		__ldf8
-#define ia64_ldf_fill		__ldf_fill
-
-#define ia64_stfs		__stfs
-#define ia64_stfd		__stfd
-#define ia64_stfe		__stfe
-#define ia64_stf8		__stf8
-#define ia64_stf_spill		__stf_spill
-
-#define ia64_mf			__mf
-#define ia64_mfa		__mfa
-
-#define ia64_fetchadd4_acq	__fetchadd4_acq
-#define ia64_fetchadd4_rel	__fetchadd4_rel
-#define ia64_fetchadd8_acq	__fetchadd8_acq
-#define ia64_fetchadd8_rel	__fetchadd8_rel
-
-#define ia64_xchg1		_InterlockedExchange8
-#define ia64_xchg2		_InterlockedExchange16
-#define ia64_xchg4		_InterlockedExchange
-#define ia64_xchg8		_InterlockedExchange64
-
-#define ia64_cmpxchg1_rel	_InterlockedCompareExchange8_rel
-#define ia64_cmpxchg1_acq	_InterlockedCompareExchange8_acq
-#define ia64_cmpxchg2_rel	_InterlockedCompareExchange16_rel
-#define ia64_cmpxchg2_acq	_InterlockedCompareExchange16_acq
-#define ia64_cmpxchg4_rel	_InterlockedCompareExchange_rel
-#define ia64_cmpxchg4_acq	_InterlockedCompareExchange_acq
-#define ia64_cmpxchg8_rel	_InterlockedCompareExchange64_rel
-#define ia64_cmpxchg8_acq	_InterlockedCompareExchange64_acq
-
-#define __ia64_set_dbr(index, val)	\
-		__setIndReg(_IA64_REG_INDR_DBR, index, val)
-#define ia64_set_ibr(index, val)	\
-		__setIndReg(_IA64_REG_INDR_IBR, index, val)
-#define ia64_set_pkr(index, val)	\
-		__setIndReg(_IA64_REG_INDR_PKR, index, val)
-#define ia64_set_pmc(index, val)	\
-		__setIndReg(_IA64_REG_INDR_PMC, index, val)
-#define ia64_set_pmd(index, val)	\
-		__setIndReg(_IA64_REG_INDR_PMD, index, val)
-#define ia64_set_rr(index, val)		\
-		__setIndReg(_IA64_REG_INDR_RR, index, val)
-
-#define ia64_get_cpuid(index)	\
-		__getIndReg(_IA64_REG_INDR_CPUID, index)
-#define __ia64_get_dbr(index)		__getIndReg(_IA64_REG_INDR_DBR, index)
-#define ia64_get_ibr(index)		__getIndReg(_IA64_REG_INDR_IBR, index)
-#define ia64_get_pkr(index)		__getIndReg(_IA64_REG_INDR_PKR, index)
-#define ia64_get_pmc(index)		__getIndReg(_IA64_REG_INDR_PMC, index)
-#define ia64_get_pmd(index)		__getIndReg(_IA64_REG_INDR_PMD, index)
-#define ia64_get_rr(index)		__getIndReg(_IA64_REG_INDR_RR, index)
-
-#define ia64_srlz_d		__dsrlz
-#define ia64_srlz_i		__isrlz
-
-#define ia64_dv_serialize_data()
-#define ia64_dv_serialize_instruction()
-
-#define ia64_st1_rel		__st1_rel
-#define ia64_st2_rel		__st2_rel
-#define ia64_st4_rel		__st4_rel
-#define ia64_st8_rel		__st8_rel
-
-/* FIXME: need st4.rel.nta intrinsic */
-#define ia64_st4_rel_nta	__st4_rel
-
-#define ia64_ld1_acq		__ld1_acq
-#define ia64_ld2_acq		__ld2_acq
-#define ia64_ld4_acq		__ld4_acq
-#define ia64_ld8_acq		__ld8_acq
-
-#define ia64_sync_i		__synci
-#define ia64_thash		__thash
-#define ia64_ttag		__ttag
-#define ia64_itcd		__itcd
-#define ia64_itci		__itci
-#define ia64_itrd		__itrd
-#define ia64_itri		__itri
-#define ia64_ptce		__ptce
-#define ia64_ptcl		__ptcl
-#define ia64_ptcg		__ptcg
-#define ia64_ptcga		__ptcga
-#define ia64_ptri		__ptri
-#define ia64_ptrd		__ptrd
-#define ia64_dep_mi		_m64_dep_mi
-
-/* Values for lfhint in __lfetch and __lfetch_fault */
-
-#define ia64_lfhint_none	__lfhint_none
-#define ia64_lfhint_nt1		__lfhint_nt1
-#define ia64_lfhint_nt2		__lfhint_nt2
-#define ia64_lfhint_nta		__lfhint_nta
-
-#define ia64_lfetch		__lfetch
-#define ia64_lfetch_excl	__lfetch_excl
-#define ia64_lfetch_fault	__lfetch_fault
-#define ia64_lfetch_fault_excl	__lfetch_fault_excl
-
-#define ia64_intrin_local_irq_restore(x)		\
-do {							\
-	if ((x) != 0) {					\
-		ia64_ssm(IA64_PSR_I);			\
-		ia64_srlz_d();				\
-	} else {					\
-		ia64_rsm(IA64_PSR_I);			\
-	}						\
-} while (0)
-
-#define __builtin_trap()	__break(0);
-
-#endif /* _ASM_IA64_INTEL_INTRIN_H */
diff --git a/arch/ia64/include/uapi/asm/intrinsics.h b/arch/ia64/include/uapi/asm/intrinsics.h
index a0e0a064f5b1..63f27c4ec739 100644
--- a/arch/ia64/include/uapi/asm/intrinsics.h
+++ b/arch/ia64/include/uapi/asm/intrinsics.h
@@ -14,11 +14,7 @@
 #include <linux/types.h>
 /* include compiler specific intrinsics */
 #include <asm/ia64regs.h>
-#ifdef __INTEL_COMPILER
-# include <asm/intel_intrin.h>
-#else
-# include <asm/gcc_intrin.h>
-#endif
+#include <asm/gcc_intrin.h>
 #include <asm/cmpxchg.h>
 
 #define ia64_set_rr0_to_rr4(val0, val1, val2, val3, val4)		\
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 898b3458b24a..9221302f6ae8 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__)))
 
 /*
  *   gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-cold-function-attribute
@@ -91,7 +85,6 @@
 /*
  * 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
  */
@@ -104,7 +97,6 @@
 /*
  * 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
  */
@@ -128,7 +120,6 @@
 
 /*
  * 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
  */
@@ -242,7 +233,6 @@
 /*
  * 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
  */
@@ -273,7 +263,6 @@
 
 /*
  * Optional: not supported by gcc.
- * Optional: not supported by icc.
  *
  * clang: https://clang.llvm.org/docs/AttributeReference.html#overloadable
  */
@@ -293,7 +282,6 @@
  * 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 74e04ecd4c89..0e06a1a79401 100644
--- a/include/linux/compiler_types.h
+++ b/include/linux/compiler_types.h
@@ -92,8 +92,6 @@ 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>
diff --git a/lib/zstd/common/compiler.h b/lib/zstd/common/compiler.h
index f5a9c70a228a..c281a6430cd4 100644
--- a/lib/zstd/common/compiler.h
+++ b/lib/zstd/common/compiler.h
@@ -116,7 +116,7 @@
 
 /* vectorization
  * older GCC (pre gcc-4.3 picked as the cutoff) uses a different syntax */
-#if !defined(__INTEL_COMPILER) && !defined(__clang__) && defined(__GNUC__)
+#if !defined(__clang__) && defined(__GNUC__)
 #  if (__GNUC__ == 4 && __GNUC_MINOR__ > 3) || (__GNUC__ >= 5)
 #    define DONT_VECTORIZE __attribute__((optimize("no-tree-vectorize")))
 #  else
diff --git a/lib/zstd/compress/zstd_fast.c b/lib/zstd/compress/zstd_fast.c
index 96b7d48e2868..800f3865119f 100644
--- a/lib/zstd/compress/zstd_fast.c
+++ b/lib/zstd/compress/zstd_fast.c
@@ -80,13 +80,6 @@ ZSTD_compressBlock_fast_generic(
     }
 
     /* Main Search Loop */
-#ifdef __INTEL_COMPILER
-    /* From intel 'The vector pragma indicates that the loop should be
-     * vectorized if it is legal to do so'. Can be used together with
-     * #pragma ivdep (but have opted to exclude that because intel
-     * warns against using it).*/
-    #pragma vector always
-#endif
     while (ip1 < ilimit) {   /* < instead of <=, because check at ip0+2 */
         size_t mLength;
         BYTE const* ip2 = ip0 + 2;
diff --git a/scripts/cc-version.sh b/scripts/cc-version.sh
index 2401c86fcf53..0573c92e841d 100755
--- a/scripts/cc-version.sh
+++ b/scripts/cc-version.sh
@@ -12,8 +12,6 @@ get_c_compiler_info()
 	cat <<- EOF | "$@" -E -P -x c - 2>/dev/null
 	#if defined(__clang__)
 	Clang	__clang_major__  __clang_minor__  __clang_patchlevel__
-	#elif defined(__INTEL_COMPILER)
-	ICC	__INTEL_COMPILER  __INTEL_COMPILER_UPDATE
 	#elif defined(__GNUC__)
 	GCC	__GNUC__  __GNUC_MINOR__  __GNUC_PATCHLEVEL__
 	#else
diff --git a/scripts/min-tool-version.sh b/scripts/min-tool-version.sh
index b6593eac5003..8766e248ffbb 100755
--- a/scripts/min-tool-version.sh
+++ b/scripts/min-tool-version.sh
@@ -19,10 +19,6 @@ binutils)
 gcc)
 	echo 5.1.0
 	;;
-icc)
-	# temporary
-	echo 16.0.3
-	;;
 llvm)
 	if [ "$SRCARCH" = s390 ]; then
 		echo 14.0.0
-- 
2.34.1