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/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
*
* wrapper/page_alloc.h
*
* wrapper around get_pfnblock_flags_mask. Using KALLSYMS to get its address
* when available, else we need to have a kernel that exports this function to
* GPL modules.
*
* Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*/
#ifndef _LTTNG_WRAPPER_PAGE_ALLOC_H
#define _LTTNG_WRAPPER_PAGE_ALLOC_H
#include <linux/mm_types.h>
#include <lttng/kernel-version.h>
#if defined(CONFIG_KALLSYMS) && \
(LTTNG_LINUX_VERSION_CODE < LTTNG_KERNEL_VERSION(6,17,0))
/*
* We need to redefine get_pfnblock_flags_mask to our wrapper, because
* the get_pageblock_migratetype() macro uses it.
*/
#define get_pfnblock_flags_mask wrapper_get_pfnblock_flags_mask
#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,14,0))
unsigned long wrapper_get_pfnblock_flags_mask(const struct page *page,
unsigned long pfn,
unsigned long mask);
#elif (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,9,0))
unsigned long wrapper_get_pfnblock_flags_mask(struct page *page,
unsigned long pfn,
unsigned long mask);
#else
unsigned long wrapper_get_pfnblock_flags_mask(struct page *page,
unsigned long pfn,
unsigned long end_bitidx,
unsigned long mask);
#endif
int wrapper_get_pfnblock_flags_mask_init(void);
#else
static inline
int wrapper_get_pfnblock_flags_mask_init(void)
{
return 0;
}
#endif
#if defined(CONFIG_KALLSYMS) && \
(LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(6,17,0))
/*
* We need to redefine get_pfnblock_migratetype to our wrapper because
* the get_pageblock_migratetype() macro uses it.
*/
#define get_pfnblock_migratetype wrapper_get_pfnblock_migratetype
enum migratetype wrapper_get_pfnblock_migratetype(const struct page *page,
unsigned long pfn);
int wrapper_get_pfnblock_migratetype_init(void);
#else
static inline
int wrapper_get_pfnblock_migratetype_init(void)
{
return 0;
}
#endif /* else CONFIG_KALLSYMS */
#endif /* _LTTNG_WRAPPER_PAGE_ALLOC_H */
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