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| author | Yinghai Lu <yinghai@kernel.org> | 2011-03-02 11:22:14 +0100 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2011-03-02 16:34:09 +0100 |
| commit | ce0033307f1b45e23e0c149f56ea4855eb4687ce (patch) | |
| tree | a6e87fd74269aafacf62805252de181b9d499579 /arch/x86/mm/numa_emulation.c | |
| parent | cc28989437de5617875a2943697fe6ba51a0da8f (diff) | |
| download | linux-ce0033307f1b45e23e0c149f56ea4855eb4687ce.tar.bz2 | |
x86-64, NUMA: Fix distance table handling
NUMA distance table handling has the following problems.
* numa_reset_distance() uses numa_distance * sizeof(numa_distance[0])
as the table size when it should be using the square of
numa_distance.
* The same size miscalculation when allocation space for phys_dist in
numa_emulation().
* In numa_emulation(), phys_dist must be reserved; otherwise, the new
emulated distance table may overlap it.
Fix them and, while at it, take numa_distance_cnt resetting in
numa_reset_distance() out of the if block to simplify the code a bit.
David Rientjes reported incorrect handling of distance table during
emulation.
-tj: Edited out numa_alloc_distance() related changes which weren't
necessary and rewrote patch description.
-v2: Ingo was unhappy with 80-column limit induced linebreaks. Let
lines run over 80-column.
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Reported-by: David Rientjes <rientjes@google.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: David Rientjes <rientjes@google.com>
Diffstat (limited to 'arch/x86/mm/numa_emulation.c')
| -rw-r--r-- | arch/x86/mm/numa_emulation.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/arch/x86/mm/numa_emulation.c b/arch/x86/mm/numa_emulation.c index 607a2e8bc87a..0afa25d967ba 100644 --- a/arch/x86/mm/numa_emulation.c +++ b/arch/x86/mm/numa_emulation.c @@ -300,6 +300,7 @@ void __init numa_emulation(struct numa_meminfo *numa_meminfo, int numa_dist_cnt) static struct numa_meminfo pi __initdata; const u64 max_addr = max_pfn << PAGE_SHIFT; u8 *phys_dist = NULL; + size_t phys_size = numa_dist_cnt * numa_dist_cnt * sizeof(phys_dist[0]); int i, j, ret; if (!emu_cmdline) @@ -336,21 +337,18 @@ void __init numa_emulation(struct numa_meminfo *numa_meminfo, int numa_dist_cnt) goto no_emu; } - /* - * Copy the original distance table. It's temporary so no need to - * reserve it. - */ + /* copy the physical distance table */ if (numa_dist_cnt) { - size_t size = numa_dist_cnt * sizeof(phys_dist[0]); u64 phys; phys = memblock_find_in_range(0, (u64)max_pfn_mapped << PAGE_SHIFT, - size, PAGE_SIZE); + phys_size, PAGE_SIZE); if (phys == MEMBLOCK_ERROR) { pr_warning("NUMA: Warning: can't allocate copy of distance table, disabling emulation\n"); goto no_emu; } + memblock_x86_reserve_range(phys, phys + phys_size, "TMP NUMA DIST"); phys_dist = __va(phys); for (i = 0; i < numa_dist_cnt; i++) @@ -398,6 +396,10 @@ void __init numa_emulation(struct numa_meminfo *numa_meminfo, int numa_dist_cnt) numa_set_distance(i, j, dist); } } + + /* free the copied physical distance table */ + if (phys_dist) + memblock_x86_free_range(__pa(phys_dist), __pa(phys_dist) + phys_size); return; no_emu: |