From: Wander Lairson Costa Date: Mon, 31 May 2021 15:23:23 +0000 (-0300) Subject: netpoll: don't require irqs disabled in rt kernels X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=b0f6c9ac8088a01cd9b6bfba8ede22f1bd0ff72f;p=linux.git netpoll: don't require irqs disabled in rt kernels write_msg(netconsole.c:836) calls netpoll_send_udp after a call to spin_lock_irqsave, which normally disables interrupts; but in PREEMPT_RT this call just locks an rt_mutex without disabling irqs. In this case, netpoll_send_udp is called with interrupts enabled. Signed-off-by: Wander Lairson Costa Signed-off-by: David S. Miller --- diff --git a/net/core/netpoll.c b/net/core/netpoll.c index c310c7c1cef7f..0a6b047145585 100644 --- a/net/core/netpoll.c +++ b/net/core/netpoll.c @@ -36,6 +36,7 @@ #include #include #include +#include /* * We maintain a small pool of fully-sized skbs, to make sure the @@ -389,7 +390,8 @@ void netpoll_send_udp(struct netpoll *np, const char *msg, int len) static atomic_t ip_ident; struct ipv6hdr *ip6h; - WARN_ON_ONCE(!irqs_disabled()); + if (!IS_ENABLED(CONFIG_PREEMPT_RT)) + WARN_ON_ONCE(!irqs_disabled()); udp_len = len + sizeof(*udph); if (np->ipv6)