Subject: linux-next: build failure after merge of the v9fs tree

From: Stephen Rothwell <[email-masked]>
Date: Mon, 5 Dec 2022 15:03:16 +1100

Hi all,

After merging the v9fs tree, today's linux-next build (i386 defconfig)
failed like this:

In file included from include/linux/kernel.h:29,
                 from arch/x86/include/asm/percpu.h:27,
                 from arch/x86/include/asm/nospec-branch.h:14,
                 from arch/x86/include/asm/paravirt_types.h:27,
                 from arch/x86/include/asm/ptrace.h:97,
                 from arch/x86/include/asm/math_emu.h:5,
                 from arch/x86/include/asm/processor.h:13,
                 from arch/x86/include/asm/timex.h:5,
                 from include/linux/timex.h:67,
                 from include/linux/time32.h:13,
                 from include/linux/time.h:60,
                 from include/linux/stat.h:19,
                 from include/linux/module.h:13,
                 from net/9p/client.c:11:
net/9p/client.c: In function 'p9_check_errors':
include/linux/kern_levels.h:5:25: error: format '%ld' expects argument of type 'long int', but argument 3 has type 'size_t' {aka 'unsigned int'} [-Werror=format=]
    5 | #define KERN_SOH        "\001"          /* ASCII Start Of Header */
      |                         ^~~~~~
include/linux/printk.h:429:25: note: in definition of macro 'printk_index_wrap'
  429 |                 _p_func(_fmt, ##__VA_ARGS__);                           \
      |                         ^~~~
include/linux/printk.h:500:9: note: in expansion of macro 'printk'
  500 |         printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
      |         ^~~~~~
include/linux/kern_levels.h:11:25: note: in expansion of macro 'KERN_SOH'
   11 | #define KERN_ERR        KERN_SOH "3"    /* error conditions */
      |                         ^~~~~~~~
include/linux/printk.h:500:16: note: in expansion of macro 'KERN_ERR'
  500 |         printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
      |                ^~~~~~~~
net/9p/client.c:523:17: note: in expansion of macro 'pr_err'
  523 |                 pr_err(
      |                 ^~~~~~
cc1: all warnings being treated as errors

Caused by commit

  36cd2f80abf8 ("net/9p: fix response size check in p9_check_errors()")

I have applied the following patch for today:

From: Stephen Rothwell <[email-masked]>
Date: Mon, 5 Dec 2022 14:55:10 +1100
Subject: [PATCH] net/9p: use %zu to print size_t

Fixes: 36cd2f80abf8 ("net/9p: fix response size check in p9_check_errors()")
Signed-off-by: Stephen Rothwell <[email-masked]>
---
 net/9p/client.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/9p/client.c b/net/9p/client.c
index deb7baa178f3..6db5e0c55f9c 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -521,7 +521,7 @@ static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
 	err = p9_parse_header(&req->rc, NULL, &type, NULL, 0);
 	if (req->rc.size > req->rc.capacity && !req->rc.zc) {
 		pr_err(
-			 "requested packet size too big: %d does not fit %ld (type=%d)\n",
+			 "requested packet size too big: %d does not fit %zu (type=%d)\n",
 			 req->rc.size, req->rc.capacity, req->rc.id);
 		return -EIO;
 	}
-- 
2.35.1

-- 
Cheers,
Stephen Rothwell