20a884f5e0
It's good to have SPDX identifiers in all files to make it easier to audit the kernel tree for correct licenses. Update the arch/s390/crypto/ files with the correct SPDX license identifier based on the license text in the file itself. The SPDX identifier is a legally binding shorthand, which can be used instead of the full boiler plate text. This work is based on a script and data from Thomas Gleixner, Philippe Ombredanne, and Kate Stewart. Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: "David S. Miller" <davem@davemloft.net> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Kate Stewart <kstewart@linuxfoundation.org> Cc: Philippe Ombredanne <pombredanne@nexb.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
34 lines
912 B
C
34 lines
912 B
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* s390 arch random implementation.
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*
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* Copyright IBM Corp. 2017
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* Author(s): Harald Freudenberger <freude@de.ibm.com>
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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 only)
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* as published by the Free Software Foundation.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/atomic.h>
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#include <linux/random.h>
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#include <linux/static_key.h>
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#include <asm/cpacf.h>
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DEFINE_STATIC_KEY_FALSE(s390_arch_random_available);
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atomic64_t s390_arch_random_counter = ATOMIC64_INIT(0);
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EXPORT_SYMBOL(s390_arch_random_counter);
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static int __init s390_arch_random_init(void)
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{
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/* check if subfunction CPACF_PRNO_TRNG is available */
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if (cpacf_query_func(CPACF_PRNO, CPACF_PRNO_TRNG))
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static_branch_enable(&s390_arch_random_available);
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return 0;
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}
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arch_initcall(s390_arch_random_init);
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