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linuxkpi: Add pagevec implementation

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Needed by drm-kmod.

Reviewed by:	hselasky
Obtained from:	OpenBSD
Sponsored by:	Beckhoff Automation GmbH & Co. KG
Differential Revision:	https://reviews.freebsd.org/D35941
This commit is contained in:
Emmanuel Vadot 2022-07-26 10:15:12 +02:00
parent aec6a64c68
commit a0c171328f
1 changed files with 69 additions and 0 deletions
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69
sys/compat/linuxkpi/common/include/linux/pagevec.h Normal file
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/* Public domain. */
#ifndef _LINUXKPI_LINUX_PAGEVEC_H_
#define _LINUXKPI_LINUX_PAGEVEC_H_
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <linux/pagemap.h>
#define PAGEVEC_SIZE 15
struct pagevec {
uint8_t nr;
struct vm_page *pages[PAGEVEC_SIZE];
};
static inline unsigned int
pagevec_space(struct pagevec *pvec)
{
return PAGEVEC_SIZE - pvec->nr;
}
static inline void
pagevec_init(struct pagevec *pvec)
{
pvec->nr = 0;
}
static inline void
pagevec_reinit(struct pagevec *pvec)
{
pvec->nr = 0;
}
static inline unsigned int
pagevec_count(struct pagevec *pvec)
{
return pvec->nr;
}
static inline unsigned int
pagevec_add(struct pagevec *pvec, struct vm_page *page)
{
pvec->pages[pvec->nr++] = page;
return PAGEVEC_SIZE - pvec->nr;
}
static inline void
__pagevec_release(struct pagevec *pvec)
{
release_pages(pvec->pages, pagevec_count(pvec));
pagevec_reinit(pvec);
}
static inline void
pagevec_release(struct pagevec *pvec)
{
if (pagevec_count(pvec))
__pagevec_release(pvec);
}
static inline void
check_move_unevictable_pages(struct pagevec *pvec)
{
}
#endif /* _LINUXKPI_LINUX_PAGEVEC_H_ */