On Tue, Aug 22, 2023 at 11:44:54AM -0700, Andrew Morton wrote: > ------------------------------------------------------ > From: Mateusz Guzik <mjguzik@xxxxxxxxx> > Subject: maple_tree: shrink struct maple_tree from 24 to 16 bytes on LP64 > Date: Tue, 22 Aug 2023 00:51:45 +0200 > > by plugging a padding hole. > > Link: https://lkml.kernel.org/r/20230821225145.2169848-1-mjguzik@xxxxxxxxx > Signed-off-by: Mateusz Guzik <mjguzik@xxxxxxxxx> > Reviewed-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx> > Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx> > Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > --- Could we perhaps amend the commit log? Subject: maple_tree: Shrink struct maple_tree Pack the members of struct maple_tree to avoid holes on 64-bit. The size shrinks from 24 to 16 bytes which will save eight bytes in every structure which embeds it. Reviewed-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
