Limit Linux RISC-V address bits#860
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Linux RISC-V systems may run with an Sv39 user address space. The generic AAL default reports 48 address bits for 64-bit targets, which makes the default pagemap cover a much larger range than the process can reserve on those systems. On an Sv39 Linux host, allocator initialisation tried to reserve a 256 GiB pagemap and mmap returned ENOMEM. Use the same conservative 38-bit RISC-V limit that the FreeBSD PAL already uses so the Linux PAL sizes its pagemap for the usable lower address range.
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Linux RISC-V systems may run with an Sv39 user address space. The generic AAL default reports 48 address bits for 64-bit targets, which makes the default pagemap cover a much larger range than the process can reserve on those systems.
On an Sv39 Linux host, allocator initialisation tried to reserve a 256 GiB pagemap and mmap returned ENOMEM. Use the same conservative 38-bit RISC-V limit that the FreeBSD PAL already uses so the Linux PAL sizes its pagemap for the usable lower address range.