Re: [PATCH] vmalloc : optimization, cleanup, bugfixes

[Eric Dumazet <dada1@cosmosbay.com>]

Zwane Mwaikambo a écrit :
> On Mon, 23 Oct 2006, Nick Piggin wrote:
>
> > Eric Dumazet wrote:
> > > [PATCH] vmalloc : optimization, cleanup, bugfixes
> > >
> > > This patch does three things
> > >
> > > 1) reorder 'struct vm_struct' to speedup lookups on CPUS with small cache
> > > lines. The fields 'next,addr,size' should be now in the same cache line, to
> > > speedup lookups.
> > >
> > > 2) One minor cleanup in __get_vm_area_node()
> > >
> > > 3) Bugfixes in vmalloc_user() and vmalloc_32_user()
> > > NULL returns from __vmalloc() and __find_vm_area() were not tested.
> > Hmm, so they weren't. As far as testing the return of __find_vm_area,
> > you can just turn that into a BUG_ON(!area), because at that point,
> > we've established that the vmalloc succeeded.
>
> No need for a BUG_ON it'll simply be a NULL dereference, at which point 
> we're back to the original code.

Indeed

This is what Andrew said one week ago :)

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