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Message-ID: <aNFKuyJ8_EjdDwn8@e110455-lin.cambridge.arm.com>
Date: Mon, 22 Sep 2025 14:10:19 +0100
From: Liviu Dudau <liviu.dudau@....com>
To: Eliav Farber <farbere@...zon.com>
Cc: linux@...linux.org.uk, jdike@...toit.com, richard@....at,
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Subject: Re: [PATCH 04/27 5.10.y] minmax: add in_range() macro
On Fri, Sep 19, 2025 at 10:17:04AM +0000, Eliav Farber wrote:
> From: "Matthew Wilcox (Oracle)" <willy@...radead.org>
>
> [ Upstream commit f9bff0e31881d03badf191d3b0005839391f5f2b ]
>
> Patch series "New page table range API", v6.
>
> This patchset changes the API used by the MM to set up page table entries.
> The four APIs are:
>
> set_ptes(mm, addr, ptep, pte, nr)
> update_mmu_cache_range(vma, addr, ptep, nr)
> flush_dcache_folio(folio)
> flush_icache_pages(vma, page, nr)
>
> flush_dcache_folio() isn't technically new, but no architecture
> implemented it, so I've done that for them. The old APIs remain around
> but are mostly implemented by calling the new interfaces.
>
> The new APIs are based around setting up N page table entries at once.
> The N entries belong to the same PMD, the same folio and the same VMA, so
> ptep++ is a legitimate operation, and locking is taken care of for you.
> Some architectures can do a better job of it than just a loop, but I have
> hesitated to make too deep a change to architectures I don't understand
> well.
>
> One thing I have changed in every architecture is that PG_arch_1 is now a
> per-folio bit instead of a per-page bit when used for dcache clean/dirty
> tracking. This was something that would have to happen eventually, and it
> makes sense to do it now rather than iterate over every page involved in a
> cache flush and figure out if it needs to happen.
>
> The point of all this is better performance, and Fengwei Yin has measured
> improvement on x86. I suspect you'll see improvement on your architecture
> too. Try the new will-it-scale test mentioned here:
> https://lore.kernel.org/linux-mm/20230206140639.538867-5-fengwei.yin@intel.com/
> You'll need to run it on an XFS filesystem and have
> CONFIG_TRANSPARENT_HUGEPAGE set.
>
> This patchset is the basis for much of the anonymous large folio work
> being done by Ryan, so it's received quite a lot of testing over the last
> few months.
>
> This patch (of 38):
>
> 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.
>
> Link: https://lkml.kernel.org/r/20230802151406.3735276-1-willy@infradead.org
> Link: https://lkml.kernel.org/r/20230802151406.3735276-2-willy@infradead.org
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: Eliav Farber <farbere@...zon.com>
> ---
> arch/arm/mm/pageattr.c | 6 ++---
> .../drm/arm/display/include/malidp_utils.h | 2 +-
> .../display/komeda/komeda_pipeline_state.c | 24 ++++++++---------
For the malidp and komeda changes:
Reviewed-by: Liviu Dudau <liviu.dudau@....com>
Best regards,
Liviu
> drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 6 -----
> .../net/ethernet/chelsio/cxgb3/cxgb3_main.c | 18 ++++++-------
> 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 +++----
> 14 files changed, 61 insertions(+), 55 deletions(-)
>
> diff --git a/arch/arm/mm/pageattr.c b/arch/arm/mm/pageattr.c
> index 9790ae3a8c68..3b3bfa825fad 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 &&
> @@ -46,8 +46,8 @@ 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;
>
> data.set_mask = set_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 7cc891c091f8..3e414d2fbdda 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 655938df4531..f11da95566da 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> @@ -657,12 +657,6 @@ 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 8a167eea288c..10790a370f22 100644
> --- a/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c
> +++ b/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c
> @@ -2131,7 +2131,7 @@ 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_extension_ioctl(struct net_device *dev, void __user *useraddr)
> 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/fs/btrfs/misc.h b/fs/btrfs/misc.h
> index 6461ebc3a1c1..40ad75511435 100644
> --- a/fs/btrfs/misc.h
> +++ b/fs/btrfs/misc.h
> @@ -8,8 +8,6 @@
> #include <asm/div64.h>
> #include <linux/rbtree.h>
>
> -#define in_range(b, first, len) ((b) >= (first) && (b) < (first) + (len))
> -
> static inline void cond_wake_up(struct wait_queue_head *wq)
> {
> /*
> diff --git a/fs/ext2/balloc.c b/fs/ext2/balloc.c
> index 9bf086821eb3..1d9380c5523b 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 1dc1292d8977..4adaf97d7435 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -3659,8 +3659,6 @@ 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 abdeae409dad..7affadcb2a29 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:
> @@ -175,6 +176,32 @@
> */
> #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 b7c3c902290f..96b61f0658c8 100644
> --- a/net/netfilter/nf_nat_core.c
> +++ b/net/netfilter/nf_nat_core.c
> @@ -262,7 +262,7 @@ 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
> @@ -311,7 +311,7 @@ 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;
> }
> }
> @@ -543,7 +543,7 @@ 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 73a26b0b9ca1..7c86fa4bb967 100644
> --- a/net/tipc/core.h
> +++ b/net/tipc/core.h
> @@ -199,7 +199,7 @@ 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 336d1bb2cf6a..ca96bdb77190 100644
> --- a/net/tipc/link.c
> +++ b/net/tipc/link.c
> @@ -1588,7 +1588,7 @@ 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;
> @@ -2216,12 +2216,12 @@ 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 */
> @@ -2264,13 +2264,13 @@ 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);
> }
> --
> 2.47.3
>
--
====================
| I would like to |
| fix the world, |
| but they're not |
| giving me the |
\ source code! /
---------------
¯\_(ツ)_/¯
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