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| author |   Pavel Kiryukhin <vksavl@gmail.com> | 2007-11-27 19:20:47 +0300 |
|---|---|---|
| committer |   Ralf Baechle <ralf@linux-mips.org> | 2007-12-01 00:39:37 +0000 |
| commit | 54fd6441e04696c046d93e4407a9e1ee9b874e51 (patch) | |
| tree | b75c48d3779cb136d09ec7610dc275532b9bfa43 /README | |
| parent | Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hpa/linux-2.6-x86setup (diff) | |
| download | linux-dev-54fd6441e04696c046d93e4407a9e1ee9b874e51.tar.xz linux-dev-54fd6441e04696c046d93e4407a9e1ee9b874e51.zip | |
[MIPS] Fix use of smp_processor_id() in preemptible code.
Freeing prom memory: 956kb freed
Freeing firmware memory: 978944k freed
Freeing unused kernel memory: 180k freed
BUG: using smp_processor_id() in preemptible [00000000] code: swapper/1
caller is r4k_dma_cache_wback_inv+0x144/0x2a0
Call Trace:
[<80117af8>] r4k_dma_cache_wback_inv+0x144/0x2a0
[<802e4b84>] debug_smp_processor_id+0xd4/0xf0
[<802e4b7c>] debug_smp_processor_id+0xcc/0xf0
...
CONFIG_DEBUG_PREEMPT is enabled.
--
Bug cause is blast_dcache_range() in preemptible code [in
r4k_dma_cache_wback_inv()].
blast_dcache_range() is constructed via __BUILD_BLAST_CACHE_RANGE that
uses cpu_dcache_line_size(). It uses current_cpu_data that use
smp_processor_id() in turn. In case of CONFIG_DEBUG_PREEMPT
smp_processor_id emits BUG if we are executing with preemption
enabled.
Cpu options of cpu0 are assumed to be the superset of all processors.
Can I make the same assumptions for cache line size and fix this
issue the following way:
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'README')
0 files changed, 0 insertions, 0 deletions