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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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d4ad53adfe
The abstraction was previously added to support separate
ttm_backup implementations.
However with the current implementation casting from a
struct file to a struct ttm_backup, we run into trouble since
struct file may have randomized the layout and gcc complains.
Remove the struct ttm_backup abstraction
Cc: dri-devel@lists.freedesktop.org
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Reported-by: Kees Cook <kees@kernel.org>
Closes: https://lore.kernel.org/dri-devel/9c8dbbafdaf9f3f089da2cde5a772d69579b3795.camel@linux.intel.com/T/#mb153ab9216cb813b92bdeb36f391ad4808c2ba29
Suggested-by: Christian König <christian.koenig@amd.com>
Fixes: 70d645deac ("drm/ttm: Add helpers for shrinking")
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://lore.kernel.org/r/20250502130014.3156-1-thomas.hellstrom@linux.intel.com
73 lines
1.9 KiB
C
73 lines
1.9 KiB
C
/* SPDX-License-Identifier: MIT */
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/*
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* Copyright © 2024 Intel Corporation
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*/
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#ifndef _TTM_BACKUP_H_
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#define _TTM_BACKUP_H_
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#include <linux/mm_types.h>
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#include <linux/shmem_fs.h>
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/**
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* ttm_backup_handle_to_page_ptr() - Convert handle to struct page pointer
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* @handle: The handle to convert.
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*
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* Converts an opaque handle received from the
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* ttm_backup_backup_page() function to an (invalid)
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* struct page pointer suitable for a struct page array.
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*
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* Return: An (invalid) struct page pointer.
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*/
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static inline struct page *
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ttm_backup_handle_to_page_ptr(unsigned long handle)
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{
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return (struct page *)(handle << 1 | 1);
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}
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/**
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* ttm_backup_page_ptr_is_handle() - Whether a struct page pointer is a handle
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* @page: The struct page pointer to check.
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*
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* Return: true if the struct page pointer is a handld returned from
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* ttm_backup_handle_to_page_ptr(). False otherwise.
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*/
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static inline bool ttm_backup_page_ptr_is_handle(const struct page *page)
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{
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return (unsigned long)page & 1;
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}
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/**
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* ttm_backup_page_ptr_to_handle() - Convert a struct page pointer to a handle
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* @page: The struct page pointer to convert
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*
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* Return: The handle that was previously used in
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* ttm_backup_handle_to_page_ptr() to obtain a struct page pointer, suitable
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* for use as argument in the struct ttm_backup_drop() or
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* ttm_backup_copy_page() functions.
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*/
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static inline unsigned long
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ttm_backup_page_ptr_to_handle(const struct page *page)
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{
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WARN_ON(!ttm_backup_page_ptr_is_handle(page));
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return (unsigned long)page >> 1;
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}
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void ttm_backup_drop(struct file *backup, pgoff_t handle);
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int ttm_backup_copy_page(struct file *backup, struct page *dst,
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pgoff_t handle, bool intr);
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s64
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ttm_backup_backup_page(struct file *backup, struct page *page,
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bool writeback, pgoff_t idx, gfp_t page_gfp,
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gfp_t alloc_gfp);
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void ttm_backup_fini(struct file *backup);
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u64 ttm_backup_bytes_avail(void);
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struct file *ttm_backup_shmem_create(loff_t size);
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#endif
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