linux-kernel - [PATCH 11/13] fs: fix unsigned enum warning with gcc-4.2

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Date:   Fri, 16 Dec 2016 11:56:32 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     linux-arch@...r.kernel.org
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...r.kernel.org,
        Russell King <rmk+kernel@...linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        kernel-build-reports@...ts.linaro.org,
        kvmarm@...ts.cs.columbia.edu, Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 11/13] fs: fix unsigned enum warning with gcc-4.2

With arm-linux-gcc-4.2, almost every file we build in the kernel ends
up with this warning:

include/linux/fs.h:2648: warning: comparison of unsigned expression < 0 is always false

Later versions don't have this problem, but it's easy enough to
work around.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 include/linux/fs.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 398cf20a706d..782c2a292fd7 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2645,7 +2645,7 @@ static const char * const kernel_read_file_str[] = {
 
 static inline const char *kernel_read_file_id_str(enum kernel_read_file_id id)
 {
-	if (id < 0 || id >= READING_MAX_ID)
+	if ((unsigned)id >= READING_MAX_ID)
 		return kernel_read_file_str[READING_UNKNOWN];
 
 	return kernel_read_file_str[id];
-- 
2.9.0