• Frederic Weisbecker's avatar
    lockdep: warn about lockdep disabling after kernel taint · 9eeba613
    Frederic Weisbecker authored
    
    
    Impact: provide useful missing info for developers
    
    Kernel taint can occur in several situations such as warnings,
    load of prorietary or staging modules, bad page, etc...
    
    But when such taint happens, a developer might still be working on
    the kernel, expecting that lockdep is still enabled. But a taint
    disables lockdep without ever warning about it.
    Such a kernel behaviour doesn't really help for kernel development.
    
    This patch adds this missing warning.
    
    Since the taint is done most of the time after the main message that
    explain the real source issue, it seems safe to warn about it inside
    add_taint() so that it appears at last, without hurting the main
    information.
    
    v2: Use a generic helper to disable lockdep instead of an
        open coded xchg().
    Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    LKML-Reference: <1239412638-6739-1-git-send-email-fweisbec@gmail.com>
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    9eeba613
debug_locks.h 1.6 KB