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MIPS: bootmem: Don't use memory holes for page bitmap
Commitf9a7febd
leads to a fact that mapstart and therefore a page bitmap for bootmem allocator immediately follows initrd_end. This doesn't always work well on Octeon, where there are holes in PFN ranges (refer to5b3b1688
and 4MB-aligned PFN allocation). Depending on the inird location it could happen, that mapstart would be in an area not allocated by plat_mem_setup() in arch/mips/cavium-octeon/setup.c, but in the alignment hole between initrd and the next PFN area. Later on this memory will be unconditionally made available to buddy allocator at the end of free_all_bootmem_core() (mm/bootmem.c). All of this results in Linux using the memory not designated for Linux in Octeon's plat_mem_setup(), which in turn means corruption of the memory used by another OS/baremetal code on the same SoC. It doesn't look to me as a problem of Octeon platform code, but rather as an inability off9a7febd
to deal correctly with the fragmented memory-mappings. Proposed fix moves the check for initrd address to the same calculation-loop in bootmem_init() (arch/mips/kernel/setup.c), which also accounts for kernel code location. This should result in mapstart located starting from the first PFN area after kernel code AND initrd. Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com> Cc: linux-mips@linux-mips.org Cc: David Daney <david.daney@cavium.com> Cc: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com> Cc: Huacai Chen <chenhc@lemote.com> Cc: Andreas Herrmann <andreas.herrmann@caviumnetworks.com> Cc: Joe Perches <joe@perches.com> Cc: Steven J. Hill <Steven.Hill@imgtec.com> Cc: Yusuf Khan <yusuf.khan@nokia.com> Cc: Michael Kreuzer <michael.kreuzer@nokia.com> Cc: Aaro Koskinen <aaro.koskinen@iki.fi> Patchwork: https://patchwork.linux-mips.org/patch/10594/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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@ -337,6 +337,11 @@ static void __init bootmem_init(void)
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min_low_pfn = start;
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if (end <= reserved_end)
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continue;
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#ifdef CONFIG_BLK_DEV_INITRD
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/* mapstart should be after initrd_end */
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if (initrd_end && end <= (unsigned long)PFN_UP(__pa(initrd_end)))
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continue;
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#endif
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if (start >= mapstart)
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continue;
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mapstart = max(reserved_end, start);
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@ -366,14 +371,6 @@ static void __init bootmem_init(void)
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max_low_pfn = PFN_DOWN(HIGHMEM_START);
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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/*
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* mapstart should be after initrd_end
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*/
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if (initrd_end)
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mapstart = max(mapstart, (unsigned long)PFN_UP(__pa(initrd_end)));
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#endif
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/*
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* Initialize the boot-time allocator with low memory only.
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*/
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