[PATCH] udp: Fix signedness warning on 32-bits architectures

[PATCH] udp: Fix signedness warning on 32-bits architectures

[Stefano Brivio]

When a ssize_t is an int:

udp.c: In function ‘udp_sock_handler’:
udp.c:774:23: warning: comparison of integer expressions of different signedness: ‘unsigned int’ and ‘ssize_t’ {aka ‘int’} [-Wsign-compare]
  774 |         for (i = 0; i < n; i += m) {
      |                       ^
udp.c:781:43: warning: comparison of integer expressions of different signedness: ‘unsigned int’ and ‘ssize_t’ {aka ‘int’} [-Wsign-compare]
  781 |                         for (m = 1; i + m < n; m++) {
      |

Change 'i' and 'm' counters in udp_sock_handler() to signed versions,
to match ssize_t n.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
---
 udp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/udp.c b/udp.c
index 20a9ea0..b7cbfdc 100644
--- a/udp.c
+++ b/udp.c
@@ -754,7 +754,7 @@ void udp_sock_handler(struct ctx *c, union epoll_ref ref, uint32_t events,
 	in_port_t dstport = ref.r.p.udp.udp.port;
 	bool v6 = ref.r.p.udp.udp.v6;
 	struct mmsghdr *mmh_recv;
-	unsigned int i, m;
+	int i, m;
 
 	if (!(events & EPOLLIN))
 		return;
-- 
@@ -754,7 +754,7 @@ void udp_sock_handler(struct ctx *c, union epoll_ref ref, uint32_t events,
 	in_port_t dstport = ref.r.p.udp.udp.port;
 	bool v6 = ref.r.p.udp.udp.v6;
 	struct mmsghdr *mmh_recv;
-	unsigned int i, m;
+	int i, m;
 
 	if (!(events & EPOLLIN))
 		return;
-- 
2.39.1

Re: [PATCH] udp: Fix signedness warning on 32-bits architectures

[David Gibson]

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On Tue, Feb 28, 2023 at 11:17:51AM +0100, Stefano Brivio wrote:
11;rgb:ffff/ffff/ffff> When a ssize_t is an int:
> 
> udp.c: In function ‘udp_sock_handler’:
> udp.c:774:23: warning: comparison of integer expressions of different signedness: ‘unsigned int’ and ‘ssize_t’ {aka ‘int’} [-Wsign-compare]
>   774 |         for (i = 0; i < n; i += m) {
>       |                       ^
> udp.c:781:43: warning: comparison of integer expressions of different signedness: ‘unsigned int’ and ‘ssize_t’ {aka ‘int’} [-Wsign-compare]
>   781 |                         for (m = 1; i + m < n; m++) {
>       |
> 
> Change 'i' and 'm' counters in udp_sock_handler() to signed versions,
> to match ssize_t n.
> 
> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

Reviewed-by: David Gibson <david@gibson.dropbear.id.au>

> ---
>  udp.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/udp.c b/udp.c
> index 20a9ea0..b7cbfdc 100644
> --- a/udp.c
> +++ b/udp.c
> @@ -754,7 +754,7 @@ void udp_sock_handler(struct ctx *c, union epoll_ref ref, uint32_t events,
>  	in_port_t dstport = ref.r.p.udp.udp.port;
>  	bool v6 = ref.r.p.udp.udp.v6;
>  	struct mmsghdr *mmh_recv;
> -	unsigned int i, m;
> +	int i, m;
>  
>  	if (!(events & EPOLLIN))
>  		return;

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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