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Date: Tue, 3 Nov 2015 11:32:51 +0900 From: Minchan Kim <minchan@...nel.org> To: Hugh Dickins <hughd@...gle.com> CC: Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org, linux-mm@...ck.org, Michael Kerrisk <mtk.manpages@...il.com>, linux-api@...r.kernel.org, Johannes Weiner <hannes@...xchg.org>, zhangyanfei@...fujitsu.com, Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>, KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>, David Miller <davem@...emloft.net>, "Darrick J. Wong" <darrick.wong@...cle.com>, Roland Dreier <roland@...nel.org>, Jason Evans <je@...com>, Daniel Micay <danielmicay@...il.com>, "Kirill A. Shutemov" <kirill@...temov.name>, Michal Hocko <mhocko@...e.cz>, yalin.wang2010@...il.com, Shaohua Li <shli@...nel.org>, Chen Gang <gang.chen.5i5j@...il.com>, "rth@...ddle.net" <rth@...ddle.net>, "ink@...assic.park.msu.ru" <ink@...assic.park.msu.ru>, "mattst88@...il.com" <mattst88@...il.com>, Ralf Baechle <ralf@...ux-mips.org>, "jejb@...isc-linux.org" <jejb@...isc-linux.org>, "deller@....de" <deller@....de>, "chris@...kel.net" <chris@...kel.net>, "jcmvbkbc@...il.com" <jcmvbkbc@...il.com>, Arnd Bergmann <arnd@...db.de>, sparclinux@...r.kernel.org, linux-arch@...r.kernel.org Subject: Re: [PATCH 3/8] arch: uapi: asm: mman.h: Let MADV_FREE have same value for all architectures On Sun, Nov 01, 2015 at 04:08:27PM -0800, Hugh Dickins wrote: > On Fri, 30 Oct 2015, Minchan Kim wrote: > > From: Chen Gang <gang.chen.5i5j@...il.com> > > > > For uapi, need try to let all macros have same value, and MADV_FREE is > > added into main branch recently, so need redefine MADV_FREE for it. > > > > At present, '8' can be shared with all architectures, so redefine it to > > '8'. > > > > Cc: rth@...ddle.net <rth@...ddle.net>, > > Cc: ink@...assic.park.msu.ru <ink@...assic.park.msu.ru> > > Cc: mattst88@...il.com <mattst88@...il.com> > > Cc: Ralf Baechle <ralf@...ux-mips.org> > > Cc: jejb@...isc-linux.org <jejb@...isc-linux.org> > > Cc: deller@....de <deller@....de> > > Cc: chris@...kel.net <chris@...kel.net> > > Cc: jcmvbkbc@...il.com <jcmvbkbc@...il.com> > > Cc: Arnd Bergmann <arnd@...db.de> > > Cc: linux-arch@...r.kernel.org > > Cc: linux-api@...r.kernel.org > > Acked-by: Minchan Kim <minchan@...nel.org> > > Signed-off-by: Chen Gang <gang.chen.5i5j@...il.com> > > Let me add > Acked-by: Hugh Dickins <hughd@...gle.com> > to this one too. > > But I have extended your mail's Cc list: Darrick pointed out earlier > that dietlibc has a Solaris #define MADV_FREE 0x5 in its mman.h, > and that was in the kernel's sparc mman.h up until 2.6.25. I doubt > that presents any obstacle nowadays, but Dave Miller should be Cc'ed. > > I was a little suspicious that 8 is available for MADV_FREE: why did > the common/generic parameters start at 9 instead of 8 back in 2.6.16? > I think the answer is that we had MADV_REMOVE coming in from one > direction, and MADV_DONTFORK coming from another direction, and when > Roland looked for where to start the commons for MADV_DONTFORK, it > appeared that 8 was occupied - by MADV_REMOVE; then a little later > MADV_REMOVE was shifted to become the first of the commons, at 9. Thanks for Ack, Ccing relevant people and history! -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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