a876ca4dde
Now that the SPDX tag is in all arch/s390/crypto/ files, that identifies the license in a specific and legally-defined manner. So the extra GPL text wording can be removed as it is no longer needed at all. This is done on a quest to remove the 700+ different ways that files in the kernel describe the GPL license text. And there's unneeded stuff like the address (sometimes incorrect) for the FSF which is never needed. No copyright headers or other non-license-description text was removed. 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: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
29 lines
712 B
C
29 lines
712 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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#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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