On Mon, Mar 30, 2020 at 05:50:06AM -0700, Matthew Wilcox wrote: >On Mon, Mar 30, 2020 at 12:36:40PM +0000, Wei Yang wrote: >> As the comment mentioned, we reserved several ranges of internal node >> for tree maintenance, 0-62, 256, 257. This means a node bigger than >> XA_ZERO_ENTRY is a normal node. >> >> The checked on XA_ZERO_ENTRY seems to be more meaningful. > >257-1023 are also reserved, they just aren't used yet. XA_ZERO_ENTRY >is not guaranteed to be the largest reserved entry. Then why we choose 4096? -- Wei Yang Help you, Help me
