On 28/08/2019 21.38, Rasmus Villemoes wrote: > The placement of the lock member in mm_context_t suggests that it is > used to protect the vdso* members, but AFAICT, it is only ever used > under #ifdef CONFIG_MODIFY_LDT_SYSCALL. So guarding the member by the > same config option is a cheap way to reduce sizeof(mm_struct) by 32 > bytes (only for !CONFIG_MODIFY_LDT_SYSCALL kernels, of course).
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