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.5...@gmail.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: r...@twiddle.net <r...@twiddle.net>, > > Cc: i...@jurassic.park.msu.ru <i...@jurassic.park.msu.ru> > > Cc: matts...@gmail.com <matts...@gmail.com> > > Cc: Ralf Baechle <r...@linux-mips.org> > > Cc: j...@parisc-linux.org <j...@parisc-linux.org> > > Cc: del...@gmx.de <del...@gmx.de> > > Cc: ch...@zankel.net <ch...@zankel.net> > > Cc: jcmvb...@gmail.com <jcmvb...@gmail.com> > > Cc: Arnd Bergmann <a...@arndb.de> > > Cc: linux-a...@vger.kernel.org > > Cc: linux-api@vger.kernel.org > > Acked-by: Minchan Kim <minc...@kernel.org> > > Signed-off-by: Chen Gang <gang.chen.5...@gmail.com> > > Let me add > Acked-by: Hugh Dickins <hu...@google.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.
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