git: e82a5dd0e6cf - stable/13 - linuxkpi: Add pagevec implementation

The branch stable/13 has been updated by manu:

URL: https://cgit.FreeBSD.org/src/commit/?id=e82a5dd0e6cffd3c50213ced73ce6105e2fa8a8c

commit e82a5dd0e6cffd3c50213ced73ce6105e2fa8a8c
Author:     Emmanuel Vadot <manu@FreeBSD.org>
AuthorDate: 2022-07-26 08:15:12 +0000
Commit:     Emmanuel Vadot <manu@FreeBSD.org>
CommitDate: 2022-09-07 15:09:03 +0000

    linuxkpi: Add pagevec implementation
    
    Needed by drm-kmod.
    
    Reviewed by:    hselasky
    Obtained from:  OpenBSD
    Sponsored by:   Beckhoff Automation GmbH & Co. KG
    Differential Revision:  https://reviews.freebsd.org/D35941
    
    (cherry picked from commit a0c171328f6689fb88e3881b8b5ee61d813b8c6d)
---
 sys/compat/linuxkpi/common/include/linux/pagevec.h | 69 ++++++++++++++++++++++
 1 file changed, 69 insertions(+)

diff --git a/sys/compat/linuxkpi/common/include/linux/pagevec.h b/sys/compat/linuxkpi/common/include/linux/pagevec.h
new file mode 100644
index 000000000000..4224124c4fe4
--- /dev/null
+++ b/sys/compat/linuxkpi/common/include/linux/pagevec.h
@@ -0,0 +1,69 @@
+/* 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_ */