From fbeb4ccac990fdb3bc26ab925a3ca8e7d2f89721 Mon Sep 17 00:00:00 2001 From: Mark Johnston Date: Sun, 6 Jun 2021 16:40:19 -0400 Subject: [PATCH] Suppress D_NEEDGIANT warnings for some drivers During boot we warn that the kbd and openfirm drivers are Giant-locked and may be deleted. Generally, the warning helps signal that certain old drivers are not being maintained and are subject to removal, but this doesn't really apply to certain drivers which are harder to detangle from Giant. Add a flag, D_GIANTOK, that devices can specify to suppress the misleading warning. Use it in the kbd and openfirm drivers. Reviewed by: imp, jhb MFC after: 1 week Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D30649 --- sys/dev/kbd/kbd.c | 2 +- sys/dev/ofw/openfirmio.c | 2 +- sys/kern/kern_conf.c | 2 +- sys/sys/conf.h | 1 + 4 files changed, 4 insertions(+), 3 deletions(-) diff --git a/sys/dev/kbd/kbd.c b/sys/dev/kbd/kbd.c index fd996f7a06a..70c0ef15a56 100644 --- a/sys/dev/kbd/kbd.c +++ b/sys/dev/kbd/kbd.c @@ -453,7 +453,7 @@ static d_poll_t genkbdpoll; static struct cdevsw kbd_cdevsw = { .d_version = D_VERSION, - .d_flags = D_NEEDGIANT, + .d_flags = D_NEEDGIANT | D_GIANTOK, .d_open = genkbdopen, .d_close = genkbdclose, .d_read = genkbdread, diff --git a/sys/dev/ofw/openfirmio.c b/sys/dev/ofw/openfirmio.c index 2112d45d4dd..30afb85baf8 100644 --- a/sys/dev/ofw/openfirmio.c +++ b/sys/dev/ofw/openfirmio.c @@ -66,7 +66,7 @@ static d_ioctl_t openfirm_ioctl; static struct cdevsw openfirm_cdevsw = { .d_version = D_VERSION, - .d_flags = D_NEEDGIANT, + .d_flags = D_NEEDGIANT | D_GIANTOK, .d_ioctl = openfirm_ioctl, .d_name = "openfirm", }; diff --git a/sys/kern/kern_conf.c b/sys/kern/kern_conf.c index 3a07c95e74d..42435c0b874 100644 --- a/sys/kern/kern_conf.c +++ b/sys/kern/kern_conf.c @@ -665,7 +665,7 @@ prep_cdevsw(struct cdevsw *devsw, int flags) devsw->d_kqfilter = dead_kqfilter; } - if (devsw->d_flags & D_NEEDGIANT) { + if ((devsw->d_flags & (D_NEEDGIANT | D_GIANTOK)) == D_NEEDGIANT) { printf("WARNING: Device \"%s\" is Giant locked and may be " "deleted before FreeBSD 14.0.\n", devsw->d_name == NULL ? "???" : devsw->d_name); diff --git a/sys/sys/conf.h b/sys/sys/conf.h index 2a87e5d3a9c..123bf91cf95 100644 --- a/sys/sys/conf.h +++ b/sys/sys/conf.h @@ -173,6 +173,7 @@ typedef int dumper_hdr_t(struct dumperinfo *di, struct kerneldumpheader *kdh, */ #define D_TRACKCLOSE 0x00080000 /* track all closes */ #define D_MMAP_ANON 0x00100000 /* special treatment in vm_mmap.c */ +#define D_GIANTOK 0x00200000 /* suppress warning about using Giant */ #define D_NEEDGIANT 0x00400000 /* driver want Giant */ #define D_NEEDMINOR 0x00800000 /* driver uses clone_create() */