linux-kernel - [PATCH v3] checksyscalls: Ignore fstat to silence build warning on LoongArch

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Date:   Tue, 30 Aug 2022 11:27:01 +0800
From:   Tiezhu Yang <yangtiezhu@...ngson.cn>
To:     Huacai Chen <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>, Arnd Bergmann <arnd@...db.de>
Cc:     loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: [PATCH v3] checksyscalls: Ignore fstat to silence build warning on LoongArch

fstat is replaced by statx on the new architecture, so an exception
is added to the checksyscalls script to silence the following build
warning on LoongArch:

  CALL    scripts/checksyscalls.sh
<stdin>:569:2: warning: #warning syscall fstat not implemented [-Wcpp]

Suggested-by: WANG Xuerui <kernel@...0n.name>
Suggested-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
---

Hi Xuerui and Arnd,

Thank you for your reviews and suggestions.

v3:
  -- Move the definition to its own block with some explanation

v2:
  -- Change scripts/checksyscalls.sh
  -- Modify patch subject and commit message

 scripts/checksyscalls.sh | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/scripts/checksyscalls.sh b/scripts/checksyscalls.sh
index f33e61a..1e5d2ee 100755
--- a/scripts/checksyscalls.sh
+++ b/scripts/checksyscalls.sh
@@ -114,7 +114,6 @@ cat << EOF
 #define __IGNORE_truncate
 #define __IGNORE_stat
 #define __IGNORE_lstat
-#define __IGNORE_fstat
 #define __IGNORE_fcntl
 #define __IGNORE_fadvise64
 #define __IGNORE_newfstatat
@@ -255,6 +254,9 @@ cat << EOF
 /* 64-bit ports never needed these, and new 32-bit ports can use statx */
 #define __IGNORE_fstat64
 #define __IGNORE_fstatat64
+
+/* Newer ports are not required to provide fstat in favor of statx */
+#define __IGNORE_fstat
 EOF
 }
 
-- 
2.1.0