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b6da0ffb09
pfn_valid() compares the PFN to max_mapnr:
__pfn >= min_low_pfn && __pfn < max_mapnr;
On HIGHMEM kernels, highend_pfn is used to set the value of max_mapnr.
Unfortunately, highend_pfn is left at zero if the system does not
actually have enough RAM to reach into the HIGHMEM range. This causes
pfn_valid() to always return false, and when debug checks are enabled
the kernel will fail catastrophically:
Memory: 22432k/32768k available (2249k kernel code, 10336k reserved, 653k data, 1352k init, 0k highmem)
NR_IRQS:128
kfree_debugcheck: out of range ptr 81c02900h.
Kernel bug detected[#1]:
Cpu 0
$ 0 : 00000000 10008400 00000034 00000000
$ 4 : 8003e160 802a0000 8003e160 00000000
$ 8 : 00000000 0000003e 00000747 00000747
...
On such a configuration, max_low_pfn should be used to set max_mapnr.
This was seen on 2.6.34.
Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
To: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/1992/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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| .. | ||
| c-octeon.c | ||
| c-r3k.c | ||
| c-r4k.c | ||
| c-tx39.c | ||
| cache.c | ||
| cerr-sb1.c | ||
| cex-gen.S | ||
| cex-oct.S | ||
| cex-sb1.S | ||
| dma-default.c | ||
| extable.c | ||
| fault.c | ||
| highmem.c | ||
| hugetlbpage.c | ||
| init.c | ||
| ioremap.c | ||
| Makefile | ||
| mmap.c | ||
| page.c | ||
| pgtable-32.c | ||
| pgtable-64.c | ||
| sc-ip22.c | ||
| sc-mips.c | ||
| sc-r5k.c | ||
| sc-rm7k.c | ||
| tlb-r3k.c | ||
| tlb-r4k.c | ||
| tlb-r8k.c | ||
| tlbex-fault.S | ||
| tlbex.c | ||
| uasm.c | ||