From 26e2d7a362f6a83146ea3eaa8f17ca9ce35388d3 Mon Sep 17 00:00:00 2001 From: Abd-Alrhman Masalkhi Date: Tue, 27 Jul 2021 08:25:13 +0200 Subject: [PATCH] block: reduce stack usage in diskstats_show MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit I have compiled the kernel with a cross compiler "hppa-linux-gnu-" v9.3.0 on x86-64 host machine. I got the following warning: block/genhd.c: In function ‘diskstats_show’: block/genhd.c:1227:1: warning: the frame size of 1688 bytes is larger than 1280 bytes [-Wframe-larger-than=] 1227 | } By Reduced the stack footprint by using the %pg printk specifier instead of disk_name to remove the need for the on-stack buffer. Signed-off-by: Abd-Alrhman Masalkhi Signed-off-by: Christoph Hellwig Reviewed-by: Hannes Reinecke Reviewed-by: Martin K. Petersen Link: https://lore.kernel.org/r/20210727062518.122108-2-hch@lst.de Signed-off-by: Jens Axboe --- block/genhd.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/block/genhd.c b/block/genhd.c index 5dbb99b57b33..cf705cf95440 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -1111,7 +1111,6 @@ static int diskstats_show(struct seq_file *seqf, void *v) { struct gendisk *gp = v; struct block_device *hd; - char buf[BDEVNAME_SIZE]; unsigned int inflight; struct disk_stats stat; unsigned long idx; @@ -1134,15 +1133,14 @@ static int diskstats_show(struct seq_file *seqf, void *v) else inflight = part_in_flight(hd); - seq_printf(seqf, "%4d %7d %s " + seq_printf(seqf, "%4d %7d %pg " "%lu %lu %lu %u " "%lu %lu %lu %u " "%u %u %u " "%lu %lu %lu %u " "%lu %u" "\n", - MAJOR(hd->bd_dev), MINOR(hd->bd_dev), - disk_name(gp, hd->bd_partno, buf), + MAJOR(hd->bd_dev), MINOR(hd->bd_dev), hd, stat.ios[STAT_READ], stat.merges[STAT_READ], stat.sectors[STAT_READ],