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v2 2026-08-21

修复page_isolation移位越界 · v2

修复 isolate_single_pageblock 的 UBSAN 移位越界：PageBuddy 分支直接 -EBUSY，PageCompound 分支保护 compound_order 竞态。

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子 Patch（2）

1/2
mm/page_isolation: fix UBSAN shift-out-of-bounds warning
A contig-range allocation racing with buddy allocation on the adjacent pageblock can trigger: UBSAN: shift-out-of-bounds in mm/page_isolation.c:393:15 shift exponent -749042176 is negative Call tr
2/2
mm/page_isolation: guard compound_order() against racing
The PageCompound branch reads compound_head() without holding a reference. A racing split or free can cause compound_head() to return a stale pointer, and compound_nr() reads the order from that stale
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