Subject: Re: linux-next: build warning after merge of the pm tree

From: Zhang Rui <[email-masked]>
Date: Wed, 27 Jan 2021 11:54:50 +0800

Hi, Stephen,

Sorry that I missed this build warning in the first place, thanks for
reporting.
The patch below fixes it.

BTW, Rafael, I think acpi_fpdt_init() also needs to be fixed to have
proper return value.
Do you prefer an incremental patch or a V2 of 208757d71098 ("ACPI:
tables: introduce support for FPDT table"), which includes all these
fixes?

thanks,
rui

>From 2b8ed148351875b4bf227602a97edba12d08af7e Mon Sep 17 00:00:00 2001
From: Zhang Rui <[email-masked]>
Date: Wed, 27 Jan 2021 11:33:33 +0800
Subject: [PATCH] ACPI: FPDT: fix build warning

Fix a build warning,
In file included from ./include/linux/printk.h:7:0,
                 from ./include/linux/kernel.h:16,
                 from ./include/linux/list.h:9,
                 from ./include/linux/kobject.h:19,
                 from ./include/linux/of.h:17,
                 from ./include/linux/irqdomain.h:35,
                 from ./include/linux/acpi.h:13,
                 from drivers/acpi/acpi_fpdt.c:11:
drivers/acpi/acpi_fpdt.c: In function ‘acpi_init_fpdt’:
./include/linux/kern_levels.h:5:18: warning: too many arguments for format [-Wformat-extra-args]
 #define KERN_SOH "\001"  /* ASCII Start Of Header */
                  ^
./include/linux/kern_levels.h:14:19: note: in expansion of macro ‘KERN_SOH’
 #define KERN_INFO KERN_SOH "6" /* informational */
                   ^~~~~~~~
./include/linux/printk.h:373:9: note: in expansion of macro ‘KERN_INFO’
  printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
         ^~~~~~~~~
drivers/acpi/acpi_fpdt.c:255:4: note: in expansion of macro ‘pr_info’
    pr_info(FW_BUG, "Invalid subtable type %d found.\n",
    ^~~~~~~

Signed-off-by: Zhang Rui <[email-masked]>
---
 drivers/acpi/acpi_fpdt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/acpi/acpi_fpdt.c b/drivers/acpi/acpi_fpdt.c
index b8108117262a..64d5733dca0b 100644
--- a/drivers/acpi/acpi_fpdt.c
+++ b/drivers/acpi/acpi_fpdt.c
@@ -252,7 +252,7 @@ void acpi_init_fpdt(void)
 					      subtable->type);
 			break;
 		default:
-			pr_info(FW_BUG, "Invalid subtable type %d found.\n",
+			pr_info(FW_BUG "Invalid subtable type %d found.\n",
 			       subtable->type);
 			return;
 		}
-- 
2.17.1

On Wed, 2021-01-27 at 12:43 +1100, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the pm tree, today's linux-next build (x86_64
> allmodconfig)
> produced this warning:
> 
> In file included from include/linux/printk.h:7,
>                  from include/linux/kernel.h:16,
>                  from include/linux/list.h:9,
>                  from include/linux/kobject.h:19,
>                  from include/linux/of.h:17,
>                  from include/linux/irqdomain.h:35,
>                  from include/linux/acpi.h:13,
>                  from drivers/acpi/acpi_fpdt.c:11:
> drivers/acpi/acpi_fpdt.c: In function 'acpi_init_fpdt':
> include/linux/kern_levels.h:5:18: warning: too many arguments for
> format [-Wformat-extra-args]
>     5 | #define KERN_SOH "\001"  /* ASCII Start Of Header */
>       |                  ^~~~~~
> include/linux/kern_levels.h:14:19: note: in expansion of macro
> 'KERN_SOH'
>    14 | #define KERN_INFO KERN_SOH "6" /* informational */
>       |                   ^~~~~~~~
> include/linux/printk.h:373:9: note: in expansion of macro 'KERN_INFO'
>   373 |  printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
>       |         ^~~~~~~~~
> drivers/acpi/acpi_fpdt.c:255:4: note: in expansion of macro 'pr_info'
>   255 |    pr_info(FW_BUG, "Invalid subtable type %d found.\n",
>       |    ^~~~~~~
> 
> Introduced by commit
> 
>   208757d71098 ("ACPI: tables: introduce support for FPDT table")
>