+ proc-report-open-files-as-size-in-stat-for-proc-pid-fd-v3.patch added to mm-nonmm-unstable branch

+ proc-report-open-files-as-size-in-stat-for-proc-pid-fd-v3.patch added to mm-nonmm-unstable branch

[Andrew Morton]

The patch titled
     Subject: proc-report-open-files-as-size-in-stat-for-proc-pid-fd-v3
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     proc-report-open-files-as-size-in-stat-for-proc-pid-fd-v3.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/proc-report-open-files-as-size-in-stat-for-proc-pid-fd-v3.patch

This patch will later appear in the mm-nonmm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

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------------------------------------------------------
From: Ivan Babrou <ivan@cloudflare.com>
Subject: proc-report-open-files-as-size-in-stat-for-proc-pid-fd-v3
Date: Mon, 17 Oct 2022 21:58:44 -0700

use bitmap_weight() to count the bits

Link: https://lkml.kernel.org/r/20221018045844.37697-1-ivan@cloudflare.com
Signed-off-by: Ivan Babrou <ivan@cloudflare.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/proc/fd.c |    7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

--- a/fs/proc/fd.c~proc-report-open-files-as-size-in-stat-for-proc-pid-fd-v3
+++ a/fs/proc/fd.c
@@ -283,7 +283,7 @@ static int proc_readfd_count(struct inod
 {
 	struct task_struct *p = get_proc_task(inode);
 	struct fdtable *fdt;
-	unsigned int i, size, open_fds = 0;
+	unsigned int open_fds = 0;
 
 	if (!p)
 		return -ENOENT;
@@ -293,10 +293,7 @@ static int proc_readfd_count(struct inod
 		rcu_read_lock();
 
 		fdt = files_fdtable(p->files);
-		size = fdt->max_fds;
-
-		for (i = size / BITS_PER_LONG; i > 0;)
-			open_fds += hweight64(fdt->open_fds[--i]);
+		open_fds = bitmap_weight(fdt->open_fds, fdt->max_fds);
 
 		rcu_read_unlock();
 	}
_

Patches currently in -mm which might be from ivan@cloudflare.com are

proc-report-open-files-as-size-in-stat-for-proc-pid-fd.patch
proc-report-open-files-as-size-in-stat-for-proc-pid-fd-v3.patch