Linux 6.4 compat: reclaimed_slab renamed to reclaimed

Reviewed-by: Richard Yao <richard.yao@alumni.stonybrook.edu>
Reviewed-by: Brian Atkinson <batkinson@lanl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Youzhong Yang <yyang@mathworks.com>
Closes openzfs#14891

config/kernel-reclaim_state.m4

@@ -0,0 +1,26 @@
+AC_DEFUN([ZFS_AC_KERNEL_SRC_RECLAIMED], [
+	dnl #
+	dnl # 6.4 API change
+	dnl # The reclaimed_slab of struct reclaim_state
+	dnl # is renamed to reclaimed
+	dnl #
+	ZFS_LINUX_TEST_SRC([reclaim_state_reclaimed], [
+		#include <linux/swap.h>
+		static const struct reclaim_state
+		    rs  __attribute__ ((unused)) = {
+		    .reclaimed = 100,
+		};
+	],[])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_RECLAIMED], [
+	AC_MSG_CHECKING([whether struct reclaim_state has reclaimed field])
+	ZFS_LINUX_TEST_RESULT([reclaim_state_reclaimed], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_RECLAIM_STATE_RECLAIMED, 1,
+		   [struct reclaim_state has reclaimed])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])
+

config/kernel.m4

@@ -146,6 +146,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
 	ZFS_AC_KERNEL_SRC___COPY_FROM_USER_INATOMIC
 	ZFS_AC_KERNEL_SRC_FILEMAP
 	ZFS_AC_KERNEL_SRC_WRITEPAGE_T
+	ZFS_AC_KERNEL_SRC_RECLAIMED
 	case "$host_cpu" in
 		powerpc*)
 			ZFS_AC_KERNEL_SRC_CPU_HAS_FEATURE
@@ -271,6 +272,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
 	ZFS_AC_KERNEL___COPY_FROM_USER_INATOMIC
 	ZFS_AC_KERNEL_FILEMAP
 	ZFS_AC_KERNEL_WRITEPAGE_T
+	ZFS_AC_KERNEL_RECLAIMED
 	case "$host_cpu" in
 		powerpc*)
 			ZFS_AC_KERNEL_CPU_HAS_FEATURE

module/os/linux/spl/spl-kmem-cache.c

@@ -183,8 +183,11 @@ kv_free(spl_kmem_cache_t *skc, void *ptr, int size)
 	 * of that infrastructure we are responsible for incrementing it.
 	 */
 	if (current->reclaim_state)
+#ifdef	HAVE_RECLAIM_STATE_RECLAIMED
+		current->reclaim_state->reclaimed += size >> PAGE_SHIFT;
+#else
 		current->reclaim_state->reclaimed_slab += size >> PAGE_SHIFT;
-
+#endif
 	vfree(ptr);
 }
 

module/os/linux/zfs/arc_os.c

@@ -219,7 +219,11 @@ arc_shrinker_scan(struct shrinker *shrink, struct shrink_control *sc)
 	arc_reduce_target_size(ptob(sc->nr_to_scan));
 	arc_wait_for_eviction(ptob(sc->nr_to_scan), B_FALSE);
 	if (current->reclaim_state != NULL)
+#ifdef	HAVE_RECLAIM_STATE_RECLAIMED
+		current->reclaim_state->reclaimed += sc->nr_to_scan;
+#else
 		current->reclaim_state->reclaimed_slab += sc->nr_to_scan;
+#endif
 
 	/*
 	 * We are experiencing memory pressure which the arc_evict_zthr was