• Paul Mundt's avatar
    sh: Fix fatal oops in copy_user_page() on sh4a (SH7780). · 8b395265
    Paul Mundt authored
    We had a pretty interesting oops happening, where copy_user_page()
    was down()'ing p3map_sem[] with a bogus offset (particularly, an
    offset that hadn't been initialized with sema_init(), due to the
    mismatch between cpu_data->dcache.n_aliases and what was assumed
    based off of the old CACHE_ALIAS value).
    
    Luckily, spinlock debugging caught this for us, and so we drop
    the old hardcoded CACHE_ALIAS for sh4 completely and rely on the
    run-time probed cpu_data->dcache.alias_mask. This in turn gets
    the p3map_sem[] index right, and everything works again.
    
    While we're at it, also convert to 4-level page tables..
    Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
    8b395265
pg-sh4.c 3.45 KB