Re: bitops.h ifdef __KERNEL__ cleanup.

From: H. Peter Anvin (
Date: Thu Jul 19 2001 - 23:18:41 EST

Followup to: <>
By author: David Woodhouse <>
In newsgroup:
> It has been stated many times that kernel headers should not be used in
> apps. Renaming or moving them should not be necessary - and people would
> probably only start to use them again anyway. We'd see autoconf checks to
> find whether it's linux/private.h or xunil/private.h :)
> In the absence of any expectation that userspace developers will ever obey
> the simple and oft-repeated rule that you don't use kernel headers from
> userspace, the #ifdef __KERNEL__ approach would seem to be the best on
> offer.

Note that the rule is at least in part theoretical; even glibc include
kernel headers or -derivatives.

I think the idea with <asm/bitops.h> is that they are protected by
#ifdef __KERNEL__ if they are kernel-only; however, if they work in
user space then there is no #ifdef and autoconf can detect their


<> at work, <> in private!
"Unix gives you enough rope to shoot yourself in the foot."
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This archive was generated by hypermail 2b29 : Mon Jul 23 2001 - 21:00:13 EST