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Give LinuxKPI Read-Write semaphores better debug names when

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WITNESS_ALL is defined. The lock name is based on the filename and
line number where the initialisation happens.

MFC after:		1 week
Sponsored by:		Mellanox Technologies
This commit is contained in:
Hans Petter Selasky 2017-03-06 12:20:56 +00:00
parent f4531c91ab
commit 684bcfec89
1 changed files with 17 additions and 5 deletions
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22
sys/compat/linuxkpi/common/include/linux/rwsem.h
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@ -2,7 +2,7 @@
* Copyright (c) 2010 Isilon Systems, Inc.
* Copyright (c) 2010 iX Systems, Inc.
* Copyright (c) 2010 Panasas, Inc.
* Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
* Copyright (c) 2013-2017 Mellanox Technologies, Ltd.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -48,13 +48,25 @@ struct rw_semaphore {
#define down_write_trylock(_rw) !!sx_try_xlock(&(_rw)->sx)
#define downgrade_write(_rw) sx_downgrade(&(_rw)->sx)
#define down_read_nested(_rw, _sc) down_read(_rw)
#define init_rwsem(_rw) linux_init_rwsem(_rw, rwsem_name("lnxrwsem"))
#ifdef WITNESS_ALL
/* NOTE: the maximum WITNESS name is 64 chars */
#define __rwsem_name(name, file, line) \
(((const char *){file ":" #line "-" name}) + \
(sizeof(file) > 16 ? sizeof(file) - 16 : 0))
#else
#define __rwsem_name(name, file, line) name
#endif
#define _rwsem_name(...) __rwsem_name(__VA_ARGS__)
#define rwsem_name(name) _rwsem_name(name, __FILE__, __LINE__)
static inline void
init_rwsem(struct rw_semaphore *rw)
linux_init_rwsem(struct rw_semaphore *rw, const char *name)
{
memset(&rw->sx, 0, sizeof(rw->sx));
sx_init_flags(&rw->sx, "lnxrwsem", SX_NOWITNESS);
memset(rw, 0, sizeof(*rw));
sx_init_flags(&rw->sx, name, SX_NOWITNESS);
}
#endif /* _LINUX_RWSEM_H_ */
#endif /* _LINUX_RWSEM_H_ */