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authorLinus Torvalds <torvalds@linux-foundation.org>2020-06-27 17:53:49 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-27 17:53:49 +0200
commit6116dea80dfd5b8d3825bf7f2e44a8bc2730f3d0 (patch)
tree729a8797b2a27ab9a1b6d38cb4a67b789e2238fa /lib/test_objagg.c
parentMerge tag 'powerpc-5.8-4' of git://git.kernel.org/pub/scm/linux/kernel/git/po... (diff)
parentkgdb: Avoid suspicious RCU usage warning (diff)
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Merge tag 'kgdb-5.8-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/danielt/linux
Pull kgdb fixes from Daniel Thompson: "The main change here is a fix for a number of unsafe interactions between kdb and the console system. The fixes are specific to kdb (pure kgdb debugging does not use the console system at all). On systems with an NMI then kdb, if it is enabled, must get messages to the user despite potentially running from some "difficult" calling contexts. These fixes avoid using the console system where we have been provided an alternative (safer) way to interact with the user and, if using the console system in unavoidable, use oops_in_progress for deadlock avoidance. These fixes also ensure kdb honours the console enable flag. Also included is a fix that wraps kgdb trap handling in an RCU read lock to avoids triggering diagnostic warnings. This is a wide lock scope but this is OK because kgdb is a stop-the-world debugger. When we stop the world we put all the CPUs into holding pens and this inhibits RCU update anyway" * tag 'kgdb-5.8-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/danielt/linux: kgdb: Avoid suspicious RCU usage warning kdb: Switch to use safer dbg_io_ops over console APIs kdb: Make kdb_printf() console handling more robust kdb: Check status of console prior to invoking handlers kdb: Re-factor kdb_printf() message write code
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