• Ingo Molnar's avatar
    sched/headers: Move task_struct::signal and task_struct::sighand types and... · c3edc401
    Ingo Molnar authored
    sched/headers: Move task_struct::signal and task_struct::sighand types and accessors into <linux/sched/signal.h>
    task_struct::signal and task_struct::sighand are pointers, which would normally make it
    straightforward to not define those types in sched.h.
    That is not so, because the types are accompanied by a myriad of APIs (macros and inline
    functions) that dereference them.
    Split the types and the APIs out of sched.h and move them into a new header, <linux/sched/signal.h>.
    With this change sched.h does not know about 'struct signal' and 'struct sighand' anymore,
    trying to put accessors into sched.h as a test fails the following way:
      ./include/linux/sched.h: In function ‘test_signal_types’:
      ./include/linux/sched.h:2461:18: error: dereferencing pointer to incomplete type ‘struct signal_struct’
    This reduces the size and complexity of sched.h significantly.
    Update all headers and .c code that relied on getting the signal handling
    functionality from <linux/sched.h> to include <linux/sched/signal.h>.
    The list of affected files in the preparatory patch was partly generated by
    grepping for the APIs, and partly by doing coverage build testing, both
    all[yes|mod|def|no]config builds on 64-bit and 32-bit x86, and an array of
    cross-architecture builds.
    Nevertheless some (trivial) build breakage is still expected related to rare
    Kconfig combinations and in-flight patches to various kernel code, but most
    of it should be handled by this patch.
    Acked-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    Cc: Mike Galbraith <efault@gmx.de>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: linux-kernel@vger.kernel.org
    Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
tap.c 28.3 KB