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Date: Fri, 06 Jun 2014 14:07:11 -0700
From: "H. Peter Anvin" <hpa@...ux.intel.com>
To: Andrew Morton <akpm@...ux-foundation.org>
CC: Linus Torvalds <torvalds@...ux-foundation.org>,
gorcunov@...nvz.org, hpa@...or.com, linux-kernel@...r.kernel.org,
luto@...capital.net, mingo@...nel.org, sasha.levin@...cle.com,
stefani@...bold.net, tglx@...utronix.de, xemul@...allels.com,
kbuild@...r.kernel.org, Sam Ravnborg <sam@...nborg.org>
Subject: Re: [GIT PULL] x86/vdso changes for v3.16
On 06/06/2014 02:00 PM, Andrew Morton wrote:
> On Wed, 4 Jun 2014 15:35:42 -0700 "H. Peter Anvin" <hpa@...ux.intel.com> wrote:
>
>> Vdso cleanups and improvements largely from Andy Lutomirski.
>
> arch/x86/vdso/vdso2c.h: In function 'go64':
> arch/x86/vdso/vdso2c.h:21: warning: implicit declaration of function 'le64toh'
> arch/x86/vdso/vdso2c.h:21: warning: implicit declaration of function 'le32toh'
> arch/x86/vdso/vdso2c.h:21: warning: implicit declaration of function 'le16toh'
> arch/x86/vdso/vdso2c.h:119: warning: implicit declaration of function 'htole16'
>
> My Fedora Core 6 (lol gotcha) test box doesn't have these.
>
> http://www.unix.com/man-page/linux/3/le64toh/ has some details. I
> don't appear to have letoh64 and friends either.
>
OK... so now we have a tools baseline problem. It isn't that we
couldn't open-code these functions, but of course we'd also like to not
*have* to do so... but also we don't want to have the kernel build rely
on autoconf ;)
So we have a few options, here:
1. We could use the unaligned macros defined in
tools/include/tools/*_byteshift.h.
2. Open-code it.
3. Define a baseline which includes these kinds of functions.
I guess I would be leaning toward #1, but would also wonder if that also
means we should add -I$(srctree)/tools/include to the global settings
... we are *already* adding it to HOSTCFLAGS_sortextable.o.
Thoughs?
-hpa
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