• Andrew Murray's avatar
    jump_label: Don't warn on __exit jump entries · 8f35eaa5
    Andrew Murray authored
    On architectures that discard .exit.* sections at runtime, a
    warning is printed for each jump label that is used within an
    in-kernel __exit annotated function:
    
    can't patch jump_label at ehci_hcd_cleanup+0x8/0x3c
    WARNING: CPU: 0 PID: 1 at kernel/jump_label.c:410 __jump_label_update+0x12c/0x138
    
    As these functions will never get executed (they are free'd along
    with the rest of initmem) - we do not need to patch them and should
    not display any warnings.
    
    The warning is displayed because the test required to satisfy
    jump_entry_is_init is based on init_section_contains (__init_begin to
    __init_end) whereas the test in __jump_label_update is based on
    init_kernel_text (_sinittext to _einittext) via kernel_text_address).
    
    Fixes: 19483677 ("jump_label: Annotate entries that operate on __init code earlier")
    Signed-off-by: default avatarAndrew Murray <andrew.murray@arm.com>
    Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
    Acked-by: default avatarMark Rutland <mark.rutland@arm.com>
    Signed-off-by: default avatarWill Deacon <will@kernel.org>
    8f35eaa5
jump_label.c 20.8 KB