mirror of
https://github.com/torvalds/linux.git
synced 2024-11-29 23:51:37 +00:00
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
/*
|
|
* Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#ifndef __LINUX_CPUFEATURE_H
|
|
#define __LINUX_CPUFEATURE_H
|
|
|
|
#ifdef CONFIG_GENERIC_CPU_AUTOPROBE
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/mod_devicetable.h>
|
|
#include <asm/cpufeature.h>
|
|
|
|
/*
|
|
* Macros imported from <asm/cpufeature.h>:
|
|
* - cpu_feature(x) ordinal value of feature called 'x'
|
|
* - cpu_have_feature(u32 n) whether feature #n is available
|
|
* - MAX_CPU_FEATURES upper bound for feature ordinal values
|
|
* Optional:
|
|
* - CPU_FEATURE_TYPEFMT format string fragment for printing the cpu type
|
|
* - CPU_FEATURE_TYPEVAL set of values matching the format string above
|
|
*/
|
|
|
|
#ifndef CPU_FEATURE_TYPEFMT
|
|
#define CPU_FEATURE_TYPEFMT "%s"
|
|
#endif
|
|
|
|
#ifndef CPU_FEATURE_TYPEVAL
|
|
#define CPU_FEATURE_TYPEVAL ELF_PLATFORM
|
|
#endif
|
|
|
|
/*
|
|
* Use module_cpu_feature_match(feature, module_init_function) to
|
|
* declare that
|
|
* a) the module shall be probed upon discovery of CPU feature 'feature'
|
|
* (typically at boot time using udev)
|
|
* b) the module must not be loaded if CPU feature 'feature' is not present
|
|
* (not even by manual insmod).
|
|
*
|
|
* For a list of legal values for 'feature', please consult the file
|
|
* 'asm/cpufeature.h' of your favorite architecture.
|
|
*/
|
|
#define module_cpu_feature_match(x, __initfunc) \
|
|
static struct cpu_feature const __maybe_unused cpu_feature_match_ ## x[] = \
|
|
{ { .feature = cpu_feature(x) }, { } }; \
|
|
MODULE_DEVICE_TABLE(cpu, cpu_feature_match_ ## x); \
|
|
\
|
|
static int __init cpu_feature_match_ ## x ## _init(void) \
|
|
{ \
|
|
if (!cpu_have_feature(cpu_feature(x))) \
|
|
return -ENODEV; \
|
|
return __initfunc(); \
|
|
} \
|
|
module_init(cpu_feature_match_ ## x ## _init)
|
|
|
|
#endif
|
|
#endif
|