tracing: Fix hwlat kthread migration

The hwlat tracer creates a kernel thread at start of the tracer. It is
pinned to a single CPU and will move to the next CPU after each period of
running. If the user modifies the migration thread's affinity, it will not
change after that happens.

The original code created the thread at the first instance it was called,
but later was changed to destroy the thread after the tracer was finished,
and would not be created until the next instance of the tracer was
established. The code that initialized the affinity was only called on the
initial instantiation of the tracer. After that, it was not initialized, and
the previous affinity did not match the current newly created one, making
it appear that the user modified the thread's affinity when it did not, and
the thread failed to migrate again.

Cc: stable@vger.kernel.org
Fixes: 0330f7aa8ee6 ("tracing: Have hwlat trace migrate across tracing_cpumask CPUs")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

path: root/include/crypto/ablk_helper.h

/*
 * Shared async block cipher helpers
 */

#ifndef _CRYPTO_ABLK_HELPER_H
#define _CRYPTO_ABLK_HELPER_H

#include <linux/crypto.h>
#include <linux/kernel.h>
#include <crypto/cryptd.h>

struct async_helper_ctx {
	struct cryptd_ablkcipher *cryptd_tfm;
};

extern int ablk_set_key(struct crypto_ablkcipher *tfm, const u8 *key,
			unsigned int key_len);

extern int __ablk_encrypt(struct ablkcipher_request *req);

extern int ablk_encrypt(struct ablkcipher_request *req);

extern int ablk_decrypt(struct ablkcipher_request *req);

extern void ablk_exit(struct crypto_tfm *tfm);

extern int ablk_init_common(struct crypto_tfm *tfm, const char *drv_name);

extern int ablk_init(struct crypto_tfm *tfm);

#endif /* _CRYPTO_ABLK_HELPER_H */