* Yinghai Lu <yinghai@xxxxxxxxxx> wrote:
> On Sat, Jan 25, 2014 at 6:25 AM, tip-bot for Toshi Kani
> <tipbot@xxxxxxxxx> wrote:
> > Commit-ID: a85eba8814631d0d48361c8b9a7ee0984e80c03c
> > Gitweb: http://git.kernel.org/tip/a85eba8814631d0d48361c8b9a7ee0984e80c03c
> > Author: Toshi Kani <toshi.kani@xxxxxx>
> > AuthorDate: Tue, 21 Jan 2014 14:33:15 -0800
> > Committer: Ingo Molnar <mingo@xxxxxxxxxx>
> > CommitDate: Sat, 25 Jan 2014 09:13:35 +0100
> >
> > arch/x86/mm/srat: Skip NUMA_NO_NODE while parsing SLIT
> >
> > When ACPI SLIT table has an I/O locality (i.e. a locality
> > unique to an I/O device), numa_set_distance() emits this warning
> > message:
> >
> > NUMA: Warning: node ids are out of bound, from=-1 to=-1 distance=10
> >
> > acpi_numa_slit_init() calls numa_set_distance() with
> > pxm_to_node(), which assumes that all localities have been
> > parsed with SRAT previously. SRAT does not list I/O localities,
> > where as SLIT lists all localities including I/Os. Hence,
> > pxm_to_node() returns NUMA_NO_NODE (-1) for an I/O locality.
> >
> > I/O localities are not supported and are ignored today, but emitting
> > such warning message leads to unnecessary confusion.
> >
> > Change acpi_numa_slit_init() to avoid calling
> > numa_set_distance() with NUMA_NO_NODE.
> >
> > Signed-off-by: Toshi Kani <toshi.kani@xxxxxx>
> > Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
> > Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> > Cc: Yinghai Lu <yinghai@xxxxxxxxxx>
> > Link: http://lkml.kernel.org/n/tip-dSvpjjvp8aMzs1ybkftxohlh@xxxxxxxxxxxxxx
> > Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
> > ---
> > arch/x86/mm/srat.c | 16 +++++++++++++---
> > 1 file changed, 13 insertions(+), 3 deletions(-)
> >
> > diff --git a/arch/x86/mm/srat.c b/arch/x86/mm/srat.c
> > index 266ca91..5ecf651 100644
> > --- a/arch/x86/mm/srat.c
> > +++ b/arch/x86/mm/srat.c
> > @@ -42,15 +42,25 @@ static __init inline int srat_disabled(void)
> > return acpi_numa < 0;
> > }
> >
> > -/* Callback for SLIT parsing */
> > +/*
> > + * Callback for SLIT parsing. pxm_to_node() returns NUMA_NO_NODE for
> > + * I/O localities since SRAT does not list them. I/O localities are
> > + * not supported at this point.
> > + */
> > void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
> > {
> > int i, j;
> >
> > - for (i = 0; i < slit->locality_count; i++)
> > - for (j = 0; j < slit->locality_count; j++)
> > + for (i = 0; i < slit->locality_count; i++) {
> > + if (pxm_to_node(i) == NUMA_NO_NODE)
> > + continue;
> > + for (j = 0; j < slit->locality_count; j++) {
> > + if (pxm_to_node(j) == NUMA_NO_NODE)
> > + continue;
> > numa_set_distance(pxm_to_node(i), pxm_to_node(j),
> > slit->entry[slit->locality_count * i + j]);
> > + }
> > + }
> > }
> >
> > /* Callback for Proximity Domain -> x2APIC mapping */
>
> wonder if the patch that i sent one year ago is better.
>
> https://lkml.org/lkml/2013/1/21/559
>
> as it avoid calling extra calling of pxm_to_node(i).
If it's "better" in the sense of being faster (and is otherwise
equivalent functionally - assuming the original patch is bug free)
then please submit it as a delta patch. (I assume the one you sent
here wasn't.)
Thanks,
Ingo
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