From ac2d8102c4b88713a8fa371d5d802fcff131d6ac Mon Sep 17 00:00:00 2001 From: Jason Miu Date: Mon, 5 Jan 2026 18:58:38 +0200 Subject: kho: relocate vmalloc preservation structure to KHO ABI header The `struct kho_vmalloc` defines the in-memory layout for preserving vmalloc regions across kexec. This layout is a contract between kernels and part of the KHO ABI. To reflect this relationship, the related structs and helper macros are relocated to the ABI header, `include/linux/kho/abi/kexec_handover.h`. This move places the structure's definition under the protection of the KHO_FDT_COMPATIBLE version string. The structure and its components are now also documented within the ABI header to describe the contract and prevent ABI breaks. [rppt@kernel.org: update comment, per Pratyush] Link: https://lkml.kernel.org/r/aW_Mqp6HcqLwQImS@kernel.org Link: https://lkml.kernel.org/r/20260105165839.285270-6-rppt@kernel.org Signed-off-by: Jason Miu Co-developed-by: Mike Rapoport (Microsoft) Signed-off-by: Mike Rapoport (Microsoft) Cc: Alexander Graf Cc: Jonathan Corbet Cc: Pasha Tatashin Cc: Pratyush Yadav Signed-off-by: Andrew Morton --- kernel/liveupdate/kexec_handover.c | 15 --------------- 1 file changed, 15 deletions(-) (limited to 'kernel') diff --git a/kernel/liveupdate/kexec_handover.c b/kernel/liveupdate/kexec_handover.c index 8f57d6e040af..66fcdda0ebdc 100644 --- a/kernel/liveupdate/kexec_handover.c +++ b/kernel/liveupdate/kexec_handover.c @@ -876,21 +876,6 @@ void kho_unpreserve_pages(struct page *page, unsigned int nr_pages) } EXPORT_SYMBOL_GPL(kho_unpreserve_pages); -struct kho_vmalloc_hdr { - DECLARE_KHOSER_PTR(next, struct kho_vmalloc_chunk *); -}; - -#define KHO_VMALLOC_SIZE \ - ((PAGE_SIZE - sizeof(struct kho_vmalloc_hdr)) / \ - sizeof(phys_addr_t)) - -struct kho_vmalloc_chunk { - struct kho_vmalloc_hdr hdr; - phys_addr_t phys[KHO_VMALLOC_SIZE]; -}; - -static_assert(sizeof(struct kho_vmalloc_chunk) == PAGE_SIZE); - /* vmalloc flags KHO supports */ #define KHO_VMALLOC_SUPPORTED_FLAGS (VM_ALLOC | VM_ALLOW_HUGE_VMAP) -- cgit v1.2.3