From: Will Deacon Date: Wed, 20 Jan 2021 14:34:23 +0000 (+0000) Subject: mm: Move immutable fields of 'struct vm_fault' into anonymous struct X-Git-Tag: v5.12-rc1~144^2~9^2~6 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=742d33729a0df11c9d8d4625dbf21dd20cdefd44;p=thirdparty%2Fkernel%2Flinux.git mm: Move immutable fields of 'struct vm_fault' into anonymous struct 'struct vm_fault' contains both information about the fault being serviced alongside mutable fields contributing to the state of the fault-handling logic. Unfortunately, the distinction between the two is not clear-cut, and a number of callers end up manipulating the structure temporarily before restoring it when returning. Try to clean this up by moving the immutable fault information into an anonymous struct, which will later be marked as 'const'. Ideally, the 'flags' field would be part of the new structure too, but it seems as though the ->page_mkwrite() path is not ready for this yet. Cc: Kirill A. Shutemov Suggested-by: Linus Torvalds Link: https://lore.kernel.org/r/CAHk-=whYs9XsO88iqJzN6NC=D-dp2m0oYXuOoZ=eWnvv=5OA+w@mail.gmail.com Signed-off-by: Will Deacon --- diff --git a/include/linux/mm.h b/include/linux/mm.h index 251a2339befb4..b4a5cb9bff7df 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -517,11 +517,14 @@ static inline bool fault_flag_allow_retry_first(unsigned int flags) * pgoff should be used in favour of virtual_address, if possible. */ struct vm_fault { - struct vm_area_struct *vma; /* Target VMA */ - unsigned int flags; /* FAULT_FLAG_xxx flags */ - gfp_t gfp_mask; /* gfp mask to be used for allocations */ - pgoff_t pgoff; /* Logical page offset based on vma */ - unsigned long address; /* Faulting virtual address */ + struct { + struct vm_area_struct *vma; /* Target VMA */ + gfp_t gfp_mask; /* gfp mask to be used for allocations */ + pgoff_t pgoff; /* Logical page offset based on vma */ + unsigned long address; /* Faulting virtual address */ + }; + unsigned int flags; /* FAULT_FLAG_xxx flags + * XXX: should really be 'const' */ pmd_t *pmd; /* Pointer to pmd entry matching * the 'address' */ pud_t *pud; /* Pointer to pud entry matching