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648c7fb16f
Make the architecture-optimized CRC code do its CPU feature checks in subsys_initcalls instead of arch_initcalls. This makes it consistent with arch/*/lib/crypto/ and ensures that it runs after initcalls that possibly could be a prerequisite for kernel-mode FPU, such as x86's xfd_update_static_branch() and loongarch's init_euen_mask(). Note: as far as I can tell, x86's xfd_update_static_branch() isn't *actually* needed for kernel-mode FPU. loongarch's init_euen_mask() is needed to enable save/restore of the vector registers, but loongarch doesn't yet have any CRC or crypto code that uses vector registers anyway. Regardless, let's be consistent with arch/*/lib/crypto/ and robust against any potential future dependency on an arch_initcall. Link: https://lore.kernel.org/r/20250510035959.87995-1-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@google.com>
40 lines
933 B
C
40 lines
933 B
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* CRC-T10DIF using [V]PCLMULQDQ instructions
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*
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* Copyright 2024 Google LLC
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*/
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#include <linux/crc-t10dif.h>
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#include <linux/module.h>
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#include "crc-pclmul-template.h"
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_pclmulqdq);
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DECLARE_CRC_PCLMUL_FUNCS(crc16_msb, u16);
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u16 crc_t10dif_arch(u16 crc, const u8 *p, size_t len)
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{
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CRC_PCLMUL(crc, p, len, crc16_msb, crc16_msb_0x8bb7_consts,
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have_pclmulqdq);
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return crc_t10dif_generic(crc, p, len);
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}
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EXPORT_SYMBOL(crc_t10dif_arch);
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static int __init crc_t10dif_x86_init(void)
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{
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if (boot_cpu_has(X86_FEATURE_PCLMULQDQ)) {
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static_branch_enable(&have_pclmulqdq);
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INIT_CRC_PCLMUL(crc16_msb);
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}
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return 0;
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}
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subsys_initcall(crc_t10dif_x86_init);
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static void __exit crc_t10dif_x86_exit(void)
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{
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}
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module_exit(crc_t10dif_x86_exit);
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MODULE_DESCRIPTION("CRC-T10DIF using [V]PCLMULQDQ instructions");
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MODULE_LICENSE("GPL");
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