Author: ian Date: Sun Mar 24 17:53:26 2019 New Revision: 345475 URL: https://svnweb.freebsd.org/changeset/base/345475
Log: Truncate a too-long interrupt handler name when there is only one handler. There are only 19 bytes available for the name of an interrupt plus the name(s) of handlers/drivers using it. There is a mechanism from the days of shared interrupts that replaces some of the handler names with '+' when they don't all fit into 19 bytes. In modern times there is typically only one device on an interrupt, but long device names are the norm, especially with embedded systems. Also, in systems with multiple interrupt controllers, the names of the interrupts themselves can be long. For example, 'gic0,s54: imx6_anatop0' doesn't fit, and replacing the device driver name with a '+' provides no useful info at all. When there is only one handler but its name was too long to fit, this change truncates enough leading chars of the handler name (replacing them with a '-' char to indicate that some chars are missing) to use all 19 bytes, preserving the unit number typically on the end of the name. Using the prior example, this results in: 'gic0,s54:-6_anatop0' which provides plenty of info to figure out which device is involved. PR: 211946 Reviewed by: gonzo@ (prior version without the '-' char) Differential Revision: https://reviews.freebsd.org/D19675 Modified: head/sys/kern/kern_intr.c Modified: head/sys/kern/kern_intr.c ============================================================================== --- head/sys/kern/kern_intr.c Sun Mar 24 16:47:43 2019 (r345474) +++ head/sys/kern/kern_intr.c Sun Mar 24 17:53:26 2019 (r345475) @@ -197,7 +197,7 @@ intr_event_update(struct intr_event *ie) /* Run through all the handlers updating values. */ CK_SLIST_FOREACH(ih, &ie->ie_handlers, ih_next) { - if (strlen(ie->ie_fullname) + strlen(ih->ih_name) + 1 < + if (strlen(ie->ie_fullname) + strlen(ih->ih_name) + 2 < sizeof(ie->ie_fullname)) { strcat(ie->ie_fullname, " "); strcat(ie->ie_fullname, ih->ih_name); @@ -209,10 +209,20 @@ intr_event_update(struct intr_event *ie) } /* - * If the handler names were too long, add +'s to indicate missing - * names. If we run out of room and still have +'s to add, change - * the last character from a + to a *. + * If there is only one handler and its name is too long, just copy in + * as much of the end of the name (includes the unit number) as will + * fit. Otherwise, we have multiple handlers and not all of the names + * will fit. Add +'s to indicate missing names. If we run out of room + * and still have +'s to add, change the last character from a + to a *. */ + if (missed == 1 && space == 1) { + ih = CK_SLIST_FIRST(&ie->ie_handlers); + missed = strlen(ie->ie_fullname) + strlen(ih->ih_name) + 2 - + sizeof(ie->ie_fullname); + strcat(ie->ie_fullname, (missed == 0) ? " " : "-"); + strcat(ie->ie_fullname, &ih->ih_name[missed]); + missed = 0; + } last = &ie->ie_fullname[sizeof(ie->ie_fullname) - 2]; while (missed-- > 0) { if (strlen(ie->ie_fullname) + 1 == sizeof(ie->ie_fullname)) { _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
