On Wed, Jul 16, 2025 at 08:53:04PM +0800, Alex wrote: > The logic is used to protect load/store tearing on 32 bit platforms, > for example, after i_size_read returned, there is no guarantee that > inode->size won't be changed. Therefore, READ/WRITE_ONCE suffice, which > is already implied by smp_load_acquire/smp_store_release. Sorry, what? The problem is not a _later_ change, it's getting the upper and lower 32bit halves from different values. Before: position is 0xffffffff After: position is 0x100000000 The value that might be returned by your variant: 0x1ffffffff.
