Revision 70e6e1b971e46f5c1c2d72217ba62401a2edc22b authored by Linus Torvalds on 20 July 2019, 17:33:44 UTC, committed by Linus Torvalds on 20 July 2019, 17:33:44 UTC
Pull CONFIG_PREEMPT_RT stub config from Thomas Gleixner:
"The real-time preemption patch set exists for almost 15 years now and
while the vast majority of infrastructure and enhancements have found
their way into the mainline kernel, the final integration of RT is
still missing.
Over the course of the last few years, we have worked on reducing the
intrusivenness of the RT patches by refactoring kernel infrastructure
to be more real-time friendly. Almost all of these changes were
benefitial to the mainline kernel on their own, so there was no
objection to integrate them.
Though except for the still ongoing printk refactoring, the remaining
changes which are required to make RT a first class mainline citizen
are not longer arguable as immediately beneficial for the mainline
kernel. Most of them are either reordering code flows or adding RT
specific functionality.
But this now has hit a wall and turned into a classic hen and egg
problem:
Maintainers are rightfully wary vs. these changes as they make only
sense if the final integration of RT into the mainline kernel takes
place.
Adding CONFIG_PREEMPT_RT aims to solve this as a clear sign that RT
will be fully integrated into the mainline kernel. The final
integration of the missing bits and pieces will be of course done with
the same careful approach as we have used in the past.
While I'm aware that you are not entirely enthusiastic about that, I
think that RT should receive the same treatment as any other widely
used out of tree functionality, which we have accepted into mainline
over the years.
RT has become the de-facto standard real-time enhancement and is
shipped by enterprise, embedded and community distros. It's in use
throughout a wide range of industries: telecommunications, industrial
automation, professional audio, medical devices, data acquisition,
automotive - just to name a few major use cases.
RT development is backed by a Linuxfoundation project which is
supported by major stakeholders of this technology. The funding will
continue over the actual inclusion into mainline to make sure that the
functionality is neither introducing regressions, regressing itself,
nor becomes subject to bitrot. There is also a lifely user community
around RT as well, so contrary to the grim situation 5 years ago, it's
a healthy project.
As RT is still a good vehicle to exercise rarely used code paths and
to detect hard to trigger issues, you could at least view it as a QA
tool if nothing else"
* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
sched/rt, Kconfig: Introduce CONFIG_PREEMPT_RT
akcipher.c
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Public Key Encryption
*
* Copyright (c) 2015, Intel Corporation
* Authors: Tadeusz Struk <tadeusz.struk@intel.com>
*/
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/crypto.h>
#include <linux/compiler.h>
#include <crypto/algapi.h>
#include <linux/cryptouser.h>
#include <net/netlink.h>
#include <crypto/akcipher.h>
#include <crypto/internal/akcipher.h>
#include "internal.h"
#ifdef CONFIG_NET
static int crypto_akcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
{
struct crypto_report_akcipher rakcipher;
memset(&rakcipher, 0, sizeof(rakcipher));
strscpy(rakcipher.type, "akcipher", sizeof(rakcipher.type));
return nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER,
sizeof(rakcipher), &rakcipher);
}
#else
static int crypto_akcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
{
return -ENOSYS;
}
#endif
static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg)
__maybe_unused;
static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg)
{
seq_puts(m, "type : akcipher\n");
}
static void crypto_akcipher_exit_tfm(struct crypto_tfm *tfm)
{
struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm);
struct akcipher_alg *alg = crypto_akcipher_alg(akcipher);
alg->exit(akcipher);
}
static int crypto_akcipher_init_tfm(struct crypto_tfm *tfm)
{
struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm);
struct akcipher_alg *alg = crypto_akcipher_alg(akcipher);
if (alg->exit)
akcipher->base.exit = crypto_akcipher_exit_tfm;
if (alg->init)
return alg->init(akcipher);
return 0;
}
static void crypto_akcipher_free_instance(struct crypto_instance *inst)
{
struct akcipher_instance *akcipher = akcipher_instance(inst);
akcipher->free(akcipher);
}
static const struct crypto_type crypto_akcipher_type = {
.extsize = crypto_alg_extsize,
.init_tfm = crypto_akcipher_init_tfm,
.free = crypto_akcipher_free_instance,
#ifdef CONFIG_PROC_FS
.show = crypto_akcipher_show,
#endif
.report = crypto_akcipher_report,
.maskclear = ~CRYPTO_ALG_TYPE_MASK,
.maskset = CRYPTO_ALG_TYPE_MASK,
.type = CRYPTO_ALG_TYPE_AKCIPHER,
.tfmsize = offsetof(struct crypto_akcipher, base),
};
int crypto_grab_akcipher(struct crypto_akcipher_spawn *spawn, const char *name,
u32 type, u32 mask)
{
spawn->base.frontend = &crypto_akcipher_type;
return crypto_grab_spawn(&spawn->base, name, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_grab_akcipher);
struct crypto_akcipher *crypto_alloc_akcipher(const char *alg_name, u32 type,
u32 mask)
{
return crypto_alloc_tfm(alg_name, &crypto_akcipher_type, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_alloc_akcipher);
static void akcipher_prepare_alg(struct akcipher_alg *alg)
{
struct crypto_alg *base = &alg->base;
base->cra_type = &crypto_akcipher_type;
base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
base->cra_flags |= CRYPTO_ALG_TYPE_AKCIPHER;
}
static int akcipher_default_op(struct akcipher_request *req)
{
return -ENOSYS;
}
int crypto_register_akcipher(struct akcipher_alg *alg)
{
struct crypto_alg *base = &alg->base;
if (!alg->sign)
alg->sign = akcipher_default_op;
if (!alg->verify)
alg->verify = akcipher_default_op;
if (!alg->encrypt)
alg->encrypt = akcipher_default_op;
if (!alg->decrypt)
alg->decrypt = akcipher_default_op;
akcipher_prepare_alg(alg);
return crypto_register_alg(base);
}
EXPORT_SYMBOL_GPL(crypto_register_akcipher);
void crypto_unregister_akcipher(struct akcipher_alg *alg)
{
crypto_unregister_alg(&alg->base);
}
EXPORT_SYMBOL_GPL(crypto_unregister_akcipher);
int akcipher_register_instance(struct crypto_template *tmpl,
struct akcipher_instance *inst)
{
akcipher_prepare_alg(&inst->alg);
return crypto_register_instance(tmpl, akcipher_crypto_instance(inst));
}
EXPORT_SYMBOL_GPL(akcipher_register_instance);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Generic public key cipher type");
Computing file changes ...
