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SubjectRe: [rfc] [patch] consolidate/clean up spinlock.h files
Hello Ingo,

On Thu, 2 Jun 2005, Ingo Molnar wrote:

> the attached patch (written by me and also containing many suggestions
> of Arjan van de Ven) does a major cleanup of the spinlock code. It does
> the following things:
> - consolidates and enhances the spinlock/rwlock debugging code
> - simplifies the asm/spinlock.h files
> - encapsulates the raw spinlock types and moves generic spinlock
> features (such as ->break_lock) into the generic code.
> - cleans up the spinlock code hierarchy to get rid of spaghetti.
> most notably there's now only a single variant of the debugging code,
> located in lib/spinlock_debug.c. (previously we had one SMP debugging
> variant per architecture, plus a separate generic one for UP builds)
> also, i've enhanced the rwlock debugging facility, it will now track
> write-owners. There is new spinlock-owner/CPU-tracking on SMP builds
> too.
> the arch-level include files now only contain the minimally necessary
> subset of the spinlock code - all the rest that can be generalized now
> lives in the generic headers:
> include/asm-i386/spinlock.h | 116 +----
> include/asm-i386/spinlock_types.h | 16
> include/asm-x86_64/spinlock.h | 146 +------
> include/asm-x86_64/spinlock_types.h | 16
> i've also split up the various spinlock variants into separate files,
> making it easier to see which does what. The new layout is:

I like the cleanup/consolidation of the debug variants,
that was pretty much overdue. My only qualm is in the increase of header
files (some of them could have remained 1 file), unless of course this new
structure makes work on a followup/dependent patch (is there one?) easier.


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