STRUCT IOPTDESC(9)

✨ NAME ✨

struct ioptdesc — the memory descriptor for IOMMU page tables, and yes bestie this is from the Kernel API Manual so bestie pay attention 💅

🎀 SYNOPSIS 🎀

struct ioptdesc {
    unsigned long __page_flags;
    struct list_head iopt_freelist_elm;
    unsigned long __page_mapping;
    union {
      u8 incoherent;
      pgoff_t __index;
    };
    void *_private;
    unsigned int __page_type;
    atomic_t __page_refcount;
  #ifdef CONFIG_MEMCG;
    unsigned long memcg_data;
  #endif;
   };

🦋 Members 🦋

• iopt_freelist_elm — literally the list element for a struct iommu_pages_list, slay 🫶
• {unnamed_union} — anonymous, no name, just vibes 🙈

🔥 Description 🔥

Okay so real talk: this struct overlays struct page for now. Do not modify without a good understanding of the issues. Like, for real fr fr — this is not the place to improvise, bestie 😭💀

🌈 SEE ALSO 🌈

• Kernel file ./drivers/iommu/iommu-pages.h
• iommu_pages_list_add(9)
• iommu_pages_list_splice(9)
• iommu_pages_list_empty(9)
• iommu_alloc_pages_sz(9)

Kernel API Manual energy, straight from ./drivers/iommu, dated October 2026 — struct ioptdesc(9), mwah 💋✨