Linux xarray

pipishuo — Mon, 29 Sep 2025 09:42:33 +0000

xa_index xa_offset xa_shift
static unsigned int get_offset(unsigned long index, struct xa_node *node) { return (index >> node->shift) & XA_CHUNK_MASK; } static void xas_set_offset(struct xa_state *xas) { xas->xa_offset = get_offset(xas->xa_index, xas->xa_node); }
Through the above code, the xa_index must be xa_shift align.the xa_offset represent the xa_index's high (64-shift) bits data.For example.Assume that the xa_index is 0111 0000,xa_shift is 4.so xa_offset is 0111

what is relationship between xa_node and entry?

some problem about buildding LFS on Debian with WSL

pipishuo — Thu, 04 Sep 2025 03:49:46 +0000

I encountered some problems when I build LFS on Debian with WSL.
The official document is here

LFS chroot cannot find /usr/bin/env

run the command ln -sv usr/lib $LFS/lib in $LFS.
I crushed same problem when i am building Linux from Scratch. on the "4.2. Creating a Limited Directory Layout in the LFS Filesystem",I run the part of shell ln -sv usr/$i $LFS/$i go wrong ,so i not have the symbol link $LFS/lib->usr/liband the problem arose.

Analogically. I need to run ln -sv usr/bin $LFS/bin and ln -sv usr/sbin $LFS/sbin

DEV Community: pipishuo

Linux xarray

some problem about buildding LFS on Debian with WSL

LFS chroot cannot find /usr/bin/env