Linux mainline: week of Jul 27

RISC-V fixes for high-memory setups, hot-remove, and boot-time races

This merge brings several targeted fixes: swiotlb initialization now works when DRAM sits above 4GiB, memory hot-remove no longer hits an out-of-bounds access on Sv39/Sv48 systems, a race involving SBI unaligned-access checks and freed __init code can no longer oops during boot, and a debug vDSO is not installed when !CONFIG_MMU. It also cleans up sparse warnings for get_cycles and drops an unnecessary runtime warning in the SiFive errata handler.

Why it matters: Improves stability for RISC-V systems with high-memory layouts, memory hotplug, and boot-time SBI checks; no broad performance impact is claimed by the commit data.

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