[PATCH v6 01/38] minmax: Add in_range() macro

["Matthew Wilcox (Oracle)" <willy@infradead.org>]

Determine if a value lies within a range more efficiently (subtraction +
comparison vs two comparisons and an AND).  It also has useful (under
some circumstances) behaviour if the range exceeds the maximum value of
the type.  Convert all the conflicting definitions of in_range() within
the kernel; some can use the generic definition while others need their
own definition.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 arch/arm/mm/pageattr.c                        |  6 ++---
 .../drm/arm/display/include/malidp_utils.h    |  2 +-
 .../display/komeda/komeda_pipeline_state.c    | 24 ++++++++---------
 drivers/gpu/drm/msm/adreno/a6xx_gmu.c         |  6 -----
 .../net/ethernet/chelsio/cxgb3/cxgb3_main.c   | 18 ++++++-------
 drivers/virt/acrn/ioreq.c                     |  4 +--
 fs/btrfs/misc.h                               |  2 --
 fs/ext2/balloc.c                              |  2 --
 fs/ext4/ext4.h                                |  2 --
 fs/ufs/util.h                                 |  6 -----
 include/linux/minmax.h                        | 27 +++++++++++++++++++
 lib/logic_pio.c                               |  3 ---
 net/netfilter/nf_nat_core.c                   |  6 ++---
 net/tipc/core.h                               |  2 +-
 net/tipc/link.c                               | 10 +++----
 .../selftests/bpf/progs/get_branch_snapshot.c |  4 +--
 16 files changed, 65 insertions(+), 59 deletions(-)

diff --git a/arch/arm/mm/pageattr.c b/arch/arm/mm/pageattr.c
index c3c34fe714b0..064ad508c149 100644
--- a/arch/arm/mm/pageattr.c
+++ b/arch/arm/mm/pageattr.c
@@ -25,7 +25,7 @@ static int change_page_range(pte_t *ptep, unsigned long addr, void *data)
 	return 0;
 }
 
-static bool in_range(unsigned long start, unsigned long size,
+static bool range_in_range(unsigned long start, unsigned long size,
 	unsigned long range_start, unsigned long range_end)
 {
 	return start >= range_start && start < range_end &&
@@ -63,8 +63,8 @@ static int change_memory_common(unsigned long addr, int numpages,
 	if (!size)
 		return 0;
 
-	if (!in_range(start, size, MODULES_VADDR, MODULES_END) &&
-	    !in_range(start, size, VMALLOC_START, VMALLOC_END))
+	if (!range_in_range(start, size, MODULES_VADDR, MODULES_END) &&
+	    !range_in_range(start, size, VMALLOC_START, VMALLOC_END))
 		return -EINVAL;
 
 	return __change_memory_common(start, size, set_mask, clear_mask);
diff --git a/drivers/gpu/drm/arm/display/include/malidp_utils.h b/drivers/gpu/drm/arm/display/include/malidp_utils.h
index 49a1d7f3539c..9f83baac6ed8 100644
--- a/drivers/gpu/drm/arm/display/include/malidp_utils.h
+++ b/drivers/gpu/drm/arm/display/include/malidp_utils.h
@@ -35,7 +35,7 @@ static inline void set_range(struct malidp_range *rg, u32 start, u32 end)
 	rg->end   = end;
 }
 
-static inline bool in_range(struct malidp_range *rg, u32 v)
+static inline bool malidp_in_range(struct malidp_range *rg, u32 v)
 {
 	return (v >= rg->start) && (v <= rg->end);
 }
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline_state.c b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline_state.c
index 3276a3e82c62..4618687a8f4d 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline_state.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline_state.c
@@ -305,12 +305,12 @@ komeda_layer_check_cfg(struct komeda_layer *layer,
 	if (komeda_fb_check_src_coords(kfb, src_x, src_y, src_w, src_h))
 		return -EINVAL;
 
-	if (!in_range(&layer->hsize_in, src_w)) {
+	if (!malidp_in_range(&layer->hsize_in, src_w)) {
 		DRM_DEBUG_ATOMIC("invalidate src_w %d.\n", src_w);
 		return -EINVAL;
 	}
 
-	if (!in_range(&layer->vsize_in, src_h)) {
+	if (!malidp_in_range(&layer->vsize_in, src_h)) {
 		DRM_DEBUG_ATOMIC("invalidate src_h %d.\n", src_h);
 		return -EINVAL;
 	}
@@ -452,14 +452,14 @@ komeda_scaler_check_cfg(struct komeda_scaler *scaler,
 	hsize_out = dflow->out_w;
 	vsize_out = dflow->out_h;
 
-	if (!in_range(&scaler->hsize, hsize_in) ||
-	    !in_range(&scaler->hsize, hsize_out)) {
+	if (!malidp_in_range(&scaler->hsize, hsize_in) ||
+	    !malidp_in_range(&scaler->hsize, hsize_out)) {
 		DRM_DEBUG_ATOMIC("Invalid horizontal sizes");
 		return -EINVAL;
 	}
 
-	if (!in_range(&scaler->vsize, vsize_in) ||
-	    !in_range(&scaler->vsize, vsize_out)) {
+	if (!malidp_in_range(&scaler->vsize, vsize_in) ||
+	    !malidp_in_range(&scaler->vsize, vsize_out)) {
 		DRM_DEBUG_ATOMIC("Invalid vertical sizes");
 		return -EINVAL;
 	}
@@ -574,13 +574,13 @@ komeda_splitter_validate(struct komeda_splitter *splitter,
 		return -EINVAL;
 	}
 
-	if (!in_range(&splitter->hsize, dflow->in_w)) {
+	if (!malidp_in_range(&splitter->hsize, dflow->in_w)) {
 		DRM_DEBUG_ATOMIC("split in_w:%d is out of the acceptable range.\n",
 				 dflow->in_w);
 		return -EINVAL;
 	}
 
-	if (!in_range(&splitter->vsize, dflow->in_h)) {
+	if (!malidp_in_range(&splitter->vsize, dflow->in_h)) {
 		DRM_DEBUG_ATOMIC("split in_h: %d exceeds the acceptable range.\n",
 				 dflow->in_h);
 		return -EINVAL;
@@ -624,13 +624,13 @@ komeda_merger_validate(struct komeda_merger *merger,
 		return -EINVAL;
 	}
 
-	if (!in_range(&merger->hsize_merged, output->out_w)) {
+	if (!malidp_in_range(&merger->hsize_merged, output->out_w)) {
 		DRM_DEBUG_ATOMIC("merged_w: %d is out of the accepted range.\n",
 				 output->out_w);
 		return -EINVAL;
 	}
 
-	if (!in_range(&merger->vsize_merged, output->out_h)) {
+	if (!malidp_in_range(&merger->vsize_merged, output->out_h)) {
 		DRM_DEBUG_ATOMIC("merged_h: %d is out of the accepted range.\n",
 				 output->out_h);
 		return -EINVAL;
@@ -866,8 +866,8 @@ void komeda_complete_data_flow_cfg(struct komeda_layer *layer,
 	 * input/output range.
 	 */
 	if (dflow->en_scaling && scaler)
-		dflow->en_split = !in_range(&scaler->hsize, dflow->in_w) ||
-				  !in_range(&scaler->hsize, dflow->out_w);
+		dflow->en_split = !malidp_in_range(&scaler->hsize, dflow->in_w) ||
+				  !malidp_in_range(&scaler->hsize, dflow->out_w);
 }
 
 static bool merger_is_available(struct komeda_pipeline *pipe,
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
index b20ef6c8ea26..57dc601fc95a 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
@@ -678,12 +678,6 @@ struct block_header {
 	u32 data[];
 };
 
-/* this should be a general kernel helper */
-static int in_range(u32 addr, u32 start, u32 size)
-{
-	return addr >= start && addr < start + size;
-}
-
 static bool fw_block_mem(struct a6xx_gmu_bo *bo, const struct block_header *blk)
 {
 	if (!in_range(blk->addr, bo->iova, bo->size))
diff --git a/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c b/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c
index 9b84c8d8d309..d117022d15d7 100644
--- a/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c
+++ b/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c
@@ -2126,7 +2126,7 @@ static const struct ethtool_ops cxgb_ethtool_ops = {
 	.set_link_ksettings = set_link_ksettings,
 };
 
-static int in_range(int val, int lo, int hi)
+static int cxgb_in_range(int val, int lo, int hi)
 {
 	return val < 0 || (val <= hi && val >= lo);
 }
@@ -2162,19 +2162,19 @@ static int cxgb_siocdevprivate(struct net_device *dev,
 			return -EINVAL;
 		if (t.qset_idx >= SGE_QSETS)
 			return -EINVAL;
-		if (!in_range(t.intr_lat, 0, M_NEWTIMER) ||
-		    !in_range(t.cong_thres, 0, 255) ||
-		    !in_range(t.txq_size[0], MIN_TXQ_ENTRIES,
+		if (!cxgb_in_range(t.intr_lat, 0, M_NEWTIMER) ||
+		    !cxgb_in_range(t.cong_thres, 0, 255) ||
+		    !cxgb_in_range(t.txq_size[0], MIN_TXQ_ENTRIES,
 			      MAX_TXQ_ENTRIES) ||
-		    !in_range(t.txq_size[1], MIN_TXQ_ENTRIES,
+		    !cxgb_in_range(t.txq_size[1], MIN_TXQ_ENTRIES,
 			      MAX_TXQ_ENTRIES) ||
-		    !in_range(t.txq_size[2], MIN_CTRL_TXQ_ENTRIES,
+		    !cxgb_in_range(t.txq_size[2], MIN_CTRL_TXQ_ENTRIES,
 			      MAX_CTRL_TXQ_ENTRIES) ||
-		    !in_range(t.fl_size[0], MIN_FL_ENTRIES,
+		    !cxgb_in_range(t.fl_size[0], MIN_FL_ENTRIES,
 			      MAX_RX_BUFFERS) ||
-		    !in_range(t.fl_size[1], MIN_FL_ENTRIES,
+		    !cxgb_in_range(t.fl_size[1], MIN_FL_ENTRIES,
 			      MAX_RX_JUMBO_BUFFERS) ||
-		    !in_range(t.rspq_size, MIN_RSPQ_ENTRIES,
+		    !cxgb_in_range(t.rspq_size, MIN_RSPQ_ENTRIES,
 			      MAX_RSPQ_ENTRIES))
 			return -EINVAL;
 
diff --git a/drivers/virt/acrn/ioreq.c b/drivers/virt/acrn/ioreq.c
index cecdc1c13af7..29e1ef1915fd 100644
--- a/drivers/virt/acrn/ioreq.c
+++ b/drivers/virt/acrn/ioreq.c
@@ -351,7 +351,7 @@ static bool handle_cf8cfc(struct acrn_vm *vm,
 	return is_handled;
 }
 
-static bool in_range(struct acrn_ioreq_range *range,
+static bool acrn_in_range(struct acrn_ioreq_range *range,
 		     struct acrn_io_request *req)
 {
 	bool ret = false;
@@ -389,7 +389,7 @@ static struct acrn_ioreq_client *find_ioreq_client(struct acrn_vm *vm,
 	list_for_each_entry(client, &vm->ioreq_clients, list) {
 		read_lock_bh(&client->range_lock);
 		list_for_each_entry(range, &client->range_list, list) {
-			if (in_range(range, req)) {
+			if (acrn_in_range(range, req)) {
 				found = client;
 				break;
 			}
diff --git a/fs/btrfs/misc.h b/fs/btrfs/misc.h
index 005751a12911..40f2d9f1a17a 100644
--- a/fs/btrfs/misc.h
+++ b/fs/btrfs/misc.h
@@ -8,8 +8,6 @@
 #include <linux/math64.h>
 #include <linux/rbtree.h>
 
-#define in_range(b, first, len) ((b) >= (first) && (b) < (first) + (len))
-
 /*
  * Enumerate bits using enum autoincrement. Define the @name as the n-th bit.
  */
diff --git a/fs/ext2/balloc.c b/fs/ext2/balloc.c
index eca60b747c6b..c8049c90323d 100644
--- a/fs/ext2/balloc.c
+++ b/fs/ext2/balloc.c
@@ -36,8 +36,6 @@
  */
 
 
-#define in_range(b, first, len)	((b) >= (first) && (b) <= (first) + (len) - 1)
-
 struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,
 					     unsigned int block_group,
 					     struct buffer_head ** bh)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 1e2259d9967d..481491e892df 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -3780,8 +3780,6 @@ static inline void set_bitmap_uptodate(struct buffer_head *bh)
 	set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
 }
 
-#define in_range(b, first, len)	((b) >= (first) && (b) <= (first) + (len) - 1)
-
 /* For ioend & aio unwritten conversion wait queues */
 #define EXT4_WQ_HASH_SZ		37
 #define ext4_ioend_wq(v)   (&ext4__ioend_wq[((unsigned long)(v)) %\
diff --git a/fs/ufs/util.h b/fs/ufs/util.h
index 4931bec1a01c..89247193d96d 100644
--- a/fs/ufs/util.h
+++ b/fs/ufs/util.h
@@ -11,12 +11,6 @@
 #include <linux/fs.h>
 #include "swab.h"
 
-
-/*
- * some useful macros
- */
-#define in_range(b,first,len)	((b)>=(first)&&(b)<(first)+(len))
-
 /*
  * functions used for retyping
  */
diff --git a/include/linux/minmax.h b/include/linux/minmax.h
index 798c6963909f..83aebc244cba 100644
--- a/include/linux/minmax.h
+++ b/include/linux/minmax.h
@@ -3,6 +3,7 @@
 #define _LINUX_MINMAX_H
 
 #include <linux/const.h>
+#include <linux/types.h>
 
 /*
  * min()/max()/clamp() macros must accomplish three things:
@@ -222,6 +223,32 @@
  */
 #define clamp_val(val, lo, hi) clamp_t(typeof(val), val, lo, hi)
 
+static inline bool in_range64(u64 val, u64 start, u64 len)
+{
+	return (val - start) < len;
+}
+
+static inline bool in_range32(u32 val, u32 start, u32 len)
+{
+	return (val - start) < len;
+}
+
+/**
+ * in_range - Determine if a value lies within a range.
+ * @val: Value to test.
+ * @start: First value in range.
+ * @len: Number of values in range.
+ *
+ * This is more efficient than "if (start <= val && val < (start + len))".
+ * It also gives a different answer if @start + @len overflows the size of
+ * the type by a sufficient amount to encompass @val.  Decide for yourself
+ * which behaviour you want, or prove that start + len never overflow.
+ * Do not blindly replace one form with the other.
+ */
+#define in_range(val, start, len)					\
+	((sizeof(start) | sizeof(len) | sizeof(val)) <= sizeof(u32) ?	\
+		in_range32(val, start, len) : in_range64(val, start, len))
+
 /**
  * swap - swap values of @a and @b
  * @a: first value
diff --git a/lib/logic_pio.c b/lib/logic_pio.c
index 07b4b9a1f54b..2ea564a40064 100644
--- a/lib/logic_pio.c
+++ b/lib/logic_pio.c
@@ -20,9 +20,6 @@
 static LIST_HEAD(io_range_list);
 static DEFINE_MUTEX(io_range_mutex);
 
-/* Consider a kernel general helper for this */
-#define in_range(b, first, len)        ((b) >= (first) && (b) < (first) + (len))
-
 /**
  * logic_pio_register_range - register logical PIO range for a host
  * @new_range: pointer to the IO range to be registered.
diff --git a/net/netfilter/nf_nat_core.c b/net/netfilter/nf_nat_core.c
index fadbd4ed3dc0..c4e0516a8dfa 100644
--- a/net/netfilter/nf_nat_core.c
+++ b/net/netfilter/nf_nat_core.c
@@ -327,7 +327,7 @@ static bool l4proto_in_range(const struct nf_conntrack_tuple *tuple,
 /* If we source map this tuple so reply looks like reply_tuple, will
  * that meet the constraints of range.
  */
-static int in_range(const struct nf_conntrack_tuple *tuple,
+static int nf_in_range(const struct nf_conntrack_tuple *tuple,
 		    const struct nf_nat_range2 *range)
 {
 	/* If we are supposed to map IPs, then we must be in the
@@ -376,7 +376,7 @@ find_appropriate_src(struct net *net,
 				       &ct->tuplehash[IP_CT_DIR_REPLY].tuple);
 			result->dst = tuple->dst;
 
-			if (in_range(result, range))
+			if (nf_in_range(result, range))
 				return 1;
 		}
 	}
@@ -607,7 +607,7 @@ get_unique_tuple(struct nf_conntrack_tuple *tuple,
 	if (maniptype == NF_NAT_MANIP_SRC &&
 	    !(range->flags & NF_NAT_RANGE_PROTO_RANDOM_ALL)) {
 		/* try the original tuple first */
-		if (in_range(orig_tuple, range)) {
+		if (nf_in_range(orig_tuple, range)) {
 			if (!nf_nat_used_tuple(orig_tuple, ct)) {
 				*tuple = *orig_tuple;
 				return;
diff --git a/net/tipc/core.h b/net/tipc/core.h
index 0a3f7a70a50a..7eccd97e0609 100644
--- a/net/tipc/core.h
+++ b/net/tipc/core.h
@@ -197,7 +197,7 @@ static inline int less(u16 left, u16 right)
 	return less_eq(left, right) && (mod(right) != mod(left));
 }
 
-static inline int in_range(u16 val, u16 min, u16 max)
+static inline int tipc_in_range(u16 val, u16 min, u16 max)
 {
 	return !less(val, min) && !more(val, max);
 }
diff --git a/net/tipc/link.c b/net/tipc/link.c
index 2eff1c7949cb..e33b4f29f77c 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -1623,7 +1623,7 @@ static int tipc_link_advance_transmq(struct tipc_link *l, struct tipc_link *r,
 					  last_ga->bgack_cnt);
 			}
 			/* Check against the last Gap ACK block */
-			if (in_range(seqno, start, end))
+			if (tipc_in_range(seqno, start, end))
 				continue;
 			/* Update/release the packet peer is acking */
 			bc_has_acked = true;
@@ -2251,12 +2251,12 @@ static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
 		strncpy(if_name, data, TIPC_MAX_IF_NAME);
 
 		/* Update own tolerance if peer indicates a non-zero value */
-		if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) {
+		if (tipc_in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) {
 			l->tolerance = peers_tol;
 			l->bc_rcvlink->tolerance = peers_tol;
 		}
 		/* Update own priority if peer's priority is higher */
-		if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI))
+		if (tipc_in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI))
 			l->priority = peers_prio;
 
 		/* If peer is going down we want full re-establish cycle */
@@ -2299,13 +2299,13 @@ static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
 		l->rcv_nxt_state = msg_seqno(hdr) + 1;
 
 		/* Update own tolerance if peer indicates a non-zero value */
-		if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) {
+		if (tipc_in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) {
 			l->tolerance = peers_tol;
 			l->bc_rcvlink->tolerance = peers_tol;
 		}
 		/* Update own prio if peer indicates a different value */
 		if ((peers_prio != l->priority) &&
-		    in_range(peers_prio, 1, TIPC_MAX_LINK_PRI)) {
+		    tipc_in_range(peers_prio, 1, TIPC_MAX_LINK_PRI)) {
 			l->priority = peers_prio;
 			rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
 		}
diff --git a/tools/testing/selftests/bpf/progs/get_branch_snapshot.c b/tools/testing/selftests/bpf/progs/get_branch_snapshot.c
index a1b139888048..511ac634eef0 100644
--- a/tools/testing/selftests/bpf/progs/get_branch_snapshot.c
+++ b/tools/testing/selftests/bpf/progs/get_branch_snapshot.c
@@ -15,7 +15,7 @@ long total_entries = 0;
 #define ENTRY_CNT 32
 struct perf_branch_entry entries[ENTRY_CNT] = {};
 
-static inline bool in_range(__u64 val)
+static inline bool gbs_in_range(__u64 val)
 {
 	return (val >= address_low) && (val < address_high);
 }
@@ -31,7 +31,7 @@ int BPF_PROG(test1, int n, int ret)
 	for (i = 0; i < ENTRY_CNT; i++) {
 		if (i >= total_entries)
 			break;
-		if (in_range(entries[i].from) && in_range(entries[i].to))
+		if (gbs_in_range(entries[i].from) && gbs_in_range(entries[i].to))
 			test1_hits++;
 		else if (!test1_hits)
 			wasted_entries++;
-- 
2.40.1