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MN10300: Enable IRQs more in system call exit work path 

Enable IRQs when calling schedule() for TIF_NEED_RESCHED and
do_notify_resume().  If interrupts are enabled during do_notify_resume(), a
warning can be seen (see lower down).

Whilst we're at it, resume_userspace can be made local to entry.S as it is not
called outside of there and it can be merged with the part of work_resched that
occurs after schedule() is called.

  WARNING: at kernel/softirq.c:160 local_bh_enable+0x42/0xa0()
  Call Trace:
    local_bh_enable+0x42/0xa0
    unix_release_sock+0x86/0x23c
    unix_release+0x20/0x28
    sock_release+0x17/0x88
    sock_close+0x20/0x28
    __fput+0xc9/0x1fc
    ____fput+0xb/0x10
    task_work_run+0x64/0x78
    do_notify_resume+0x53d/0x544
    work_notifysig+0xa/0xc

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Ken Cox <jkc@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Howells 2013-05-28 20:21:10 +01:00 committed by Linus Torvalds
parent 1e00227d4e
commit d17fc238ac
1 changed files with 5 additions and 13 deletions
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18
arch/mn10300/kernel/entry.S
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@ -108,10 +108,10 @@ syscall_exit_work:
and EPSW_nSL,d0
beq resume_kernel # returning to supervisor mode
btst _TIF_SYSCALL_TRACE,d2
beq work_pending
LOCAL_IRQ_ENABLE # could let syscall_trace_exit() call
# schedule() instead
btst _TIF_SYSCALL_TRACE,d2
beq work_pending
mov fp,d0
call syscall_trace_exit[],0 # do_syscall_trace(regs)
jmp resume_userspace
@ -124,6 +124,7 @@ work_pending:
work_resched:
call schedule[],0
resume_userspace:
# make sure we don't miss an interrupt setting need_resched or
# sigpending between sampling and the rti
LOCAL_IRQ_DISABLE
@ -132,6 +133,8 @@ work_resched:
mov (TI_flags,a2),d2
btst _TIF_WORK_MASK,d2
beq restore_all
LOCAL_IRQ_ENABLE
btst _TIF_NEED_RESCHED,d2
bne work_resched
@ -170,17 +173,6 @@ ret_from_intr:
and EPSW_nSL,d0
beq resume_kernel # returning to supervisor mode
ENTRY(resume_userspace)
# make sure we don't miss an interrupt setting need_resched or
# sigpending between sampling and the rti
LOCAL_IRQ_DISABLE
# is there any work to be done on int/exception return?
mov (TI_flags,a2),d2
btst _TIF_WORK_MASK,d2
bne work_pending
jmp restore_all
#ifdef CONFIG_PREEMPT
ENTRY(resume_kernel)
LOCAL_IRQ_DISABLE