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__UNIQUE_ID()

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Jan Beulich points out __COUNTER__ (gcc 4.3 and above), so let's use
that to create unique ids.  This is better than __LINE__ which we use
today, so provide a wrapper.

Stanislaw Gruszka <sgruszka@redhat.com> reported that some module parameters
start with a digit, so we need to prepend when we for the unique id.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Acked-by: Jan Beulich <jbeulich@suse.com>
This commit is contained in:
Rusty Russell 2012-11-22 12:30:25 +10:30
parent d890f510c8
commit 6f33d58794
2 changed files with 11 additions and 0 deletions
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2
include/linux/compiler-gcc4.h
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@ -31,6 +31,8 @@
#define __linktime_error(message) __attribute__((__error__(message))) #define __linktime_error(message) __attribute__((__error__(message)))
#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
#if __GNUC_MINOR__ >= 5 #if __GNUC_MINOR__ >= 5
/* /*
* Mark a position in code as unreachable. This can be used to * Mark a position in code as unreachable. This can be used to

9
include/linux/compiler.h
View file

@ -42,6 +42,10 @@ extern void __chk_io_ptr(const volatile void __iomem *);
# define __rcu # define __rcu
#endif #endif
/* Indirect macros required for expanded argument pasting, eg. __LINE__. */
#define ___PASTE(a,b) a##b
#define __PASTE(a,b) ___PASTE(a,b)
#ifdef __KERNEL__ #ifdef __KERNEL__
#ifdef __GNUC__ #ifdef __GNUC__
@ -164,6 +168,11 @@ void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect);
(typeof(ptr)) (__ptr + (off)); }) (typeof(ptr)) (__ptr + (off)); })
#endif #endif
/* Not-quite-unique ID. */
#ifndef __UNIQUE_ID
# define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __LINE__)
#endif
#endif /* __KERNEL__ */ #endif /* __KERNEL__ */
#endif /* __ASSEMBLY__ */ #endif /* __ASSEMBLY__ */