Re: [PATCH] [30/30] x86_64: Add missing !X86_PAE dependincy to the 2G/2G split.

[Eric Dumazet <dada1@cosmosbay.com>]

Eric W. Biederman a écrit :
> Bill Irwin <bill.irwin@oracle.com> writes:
>
> > Only 1GB-aligned kernel/user splits are now handled for PAE. The
> > 2GB/2GB split attempts to avoid aliasing vmallocspace with the 1:1
> > mapping for physical memory by using an actual split of 1.875/2.125
> > to accommodate 128MB of vmallocspace out of what would otherwise
> > be a full 2GB for userspace. That attempt disturbs the alignment
> > required by PAE for 2GB/2GB splits, and furthermore does not provide
> > a 2GB/2GB split as advertised.
> >
> > This patch resolves the issues here in two manners. The first is
> > by providing a true 2GB/2GB split in addition to the 1.875/2.125
> > split. The second is by renaming the 1.875/2.125 split to
> > CONFIG_VMSPLIT_2G_OPT analogously to CONFIG_VMSPLIT_3G_OPT, which
> > performs a similar manuever to avoid aliasing vmallocspace with
> > the 1:1 mapping for physical memory around the 3GB boundary. With
> > the 1.875/2.125 split properly-named, its config option is then
> > tagged as depending on !HIGHMEM to express the PAE implementation's
> > current inability to deal with such unaligned splits.
> >
> > This patch is essentially a combination of two patches, one written
> > by Eric Biederman and the other by Eric Dumazet. If they could add
> > their Signed-off-by: to this, I'd be much obliged.
> >
> > Signed-off-by: William Irwin <wli@holomorphy.com>
> > Cc: Eric Dumazet <dada1@cosmosbay.com>
> > Cc: Mark Lord <lkml@rtr.ca>
> > Cc: Eric W. Biederman <ebiederm@xmission.com>
> > Cc: Andi Kleen <ak@suse.de>
>
> Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>

Acked-by: Eric Dumazet <dada1@cosmosbay.com>
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