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c785896b21
The table id (second) argument to MODULE_DEVICE_TABLE is often
referenced otherwise. This is not the case for CPU features. This
leads to warnings when building the kernel with Clang:
arch/arm/crypto/aes-ce-glue.c:450:1: warning: variable
'cpu_feature_match_AES' is not needed and will not be emitted
[-Wunneeded-internal-declaration]
module_cpu_feature_match(AES, aes_init);
^
Avoid warnings by using __maybe_unused, similar to commit 1f318a8baf
("modules: mark __inittest/__exittest as __maybe_unused").
Fixes: 67bad2fdb7 ("cpu: add generic support for CPU feature based module autoloading")
Signed-off-by: Stefan Agner <stefan@agner.ch>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
/*
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* Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __LINUX_CPUFEATURE_H
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#define __LINUX_CPUFEATURE_H
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#ifdef CONFIG_GENERIC_CPU_AUTOPROBE
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#include <linux/init.h>
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#include <linux/mod_devicetable.h>
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#include <asm/cpufeature.h>
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/*
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* Macros imported from <asm/cpufeature.h>:
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* - cpu_feature(x) ordinal value of feature called 'x'
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* - cpu_have_feature(u32 n) whether feature #n is available
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* - MAX_CPU_FEATURES upper bound for feature ordinal values
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* Optional:
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* - CPU_FEATURE_TYPEFMT format string fragment for printing the cpu type
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* - CPU_FEATURE_TYPEVAL set of values matching the format string above
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*/
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#ifndef CPU_FEATURE_TYPEFMT
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#define CPU_FEATURE_TYPEFMT "%s"
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#endif
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#ifndef CPU_FEATURE_TYPEVAL
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#define CPU_FEATURE_TYPEVAL ELF_PLATFORM
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#endif
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/*
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* Use module_cpu_feature_match(feature, module_init_function) to
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* declare that
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* a) the module shall be probed upon discovery of CPU feature 'feature'
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* (typically at boot time using udev)
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* b) the module must not be loaded if CPU feature 'feature' is not present
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* (not even by manual insmod).
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*
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* For a list of legal values for 'feature', please consult the file
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* 'asm/cpufeature.h' of your favorite architecture.
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*/
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#define module_cpu_feature_match(x, __initfunc) \
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static struct cpu_feature const __maybe_unused cpu_feature_match_ ## x[] = \
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{ { .feature = cpu_feature(x) }, { } }; \
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MODULE_DEVICE_TABLE(cpu, cpu_feature_match_ ## x); \
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\
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static int __init cpu_feature_match_ ## x ## _init(void) \
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{ \
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if (!cpu_have_feature(cpu_feature(x))) \
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return -ENODEV; \
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return __initfunc(); \
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} \
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module_init(cpu_feature_match_ ## x ## _init)
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#endif
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#endif
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