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On Wed, 2006-05-03 at 22:55 -0700, Vadim Lobanov wrote: > Hi, > > I was reading through the include/linux/limits.h file in order to > generate a cleanup patch for it -- a large number of #defines within > that file are no longer being used, as I surmise that they are simply > remnants of earlier implementations. > > A snippet from include/linux/limits.h: > #define PIPE_BUF 4096 /* # bytes in atomic write to a pipe */ > > PIPE_BUF is a bit of an oddity. It is defined there, then redefined in > the arm header files, even though those header files are never included > anywhere. Also, PIPE_BUF is never referenced by name in any of the Linux > code. And yet, it is still being mentioned in some Big And Scary > Warnings (tm): fs/autofs4/waitq.c or include/linux/pipe_fs_i.h, for > example. it's for userland to tell it what the size of the atomic pipe operations we can do is. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | |||||||||
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