[PATCH v2 11/13] netpoll: avoid put_unaligned() on single character

Arnd Bergmann
2021-05-14T10:05:11Z

From: Arnd Bergmann <arnd@arndb.de>

With a planned cleanup, using put_unaligned() on a single character
results in a harmless warning:

In file included from ./arch/x86/include/generated/asm/unaligned.h:1,
from include/linux/etherdevice.h:24,
from net/core/netpoll.c:18:
net/core/netpoll.c: In function 'netpoll_send_udp':
include/asm-generic/unaligned.h:23:9: error: 'packed' attribute ignored for field of type 'unsigned char' [-Werror=attributes]
net/core/netpoll.c:431:3: note: in expansion of macro 'put_unaligned'
431 | put_unaligned(0x60, (unsigned char *)ip6h);
| ^~~~~~~~~~~~~
include/asm-generic/unaligned.h:23:9: error: 'packed' attribute ignored for field of type 'unsigned char' [-Werror=attributes]
net/core/netpoll.c:459:3: note: in expansion of macro 'put_unaligned'
459 | put_unaligned(0x45, (unsigned char *)iph);
| ^~~~~~~~~~~~~

Replace this with an open-coded pointer dereference.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
net/core/netpoll.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index c310c7c1cef7..9c49a38fa315 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -428,7 +428,7 @@ void netpoll_send_udp(struct netpoll *np, const char *msg, int len)
ip6h = ipv6_hdr(skb);

/* ip6h->version = 6; ip6h->priority = 0; */
- put_unaligned(0x60, (unsigned char *)ip6h);
+ *(unsigned char *)ip6h = 0x60;
ip6h->flow_lbl[0] = 0;
ip6h->flow_lbl[1] = 0;
ip6h->flow_lbl[2] = 0;
@@ -456,7 +456,7 @@ void netpoll_send_udp(struct netpoll *np, const char *msg, int len)
iph = ip_hdr(skb);

/* iph->version = 4; iph->ihl = 5; */
- put_unaligned(0x45, (unsigned char *)iph);
+ *(unsigned char *)iph = 0x45;
iph->tos = 0;
put_unaligned(htons(ip_len), &(iph->tot_len));
iph->id = htons(atomic_inc_return(&ip_ident));
--
2.29.2