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Pass mode to wait_on_atomic_t() action funcs and provide default actions

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Make wait_on_atomic_t() pass the TASK_* mode onto its action function as an
extra argument and make it 'unsigned int throughout.

Also, consolidate a bunch of identical action functions into a default
function that can do the appropriate thing for the mode.

Also, change the argument name in the bit_wait*() function declarations to
reflect the fact that it's the mode and not the bit number.

[Peter Z gives this a grudging ACK, but thinks that the whole atomic_t wait
should be done differently, though he's not immediately sure as to how]

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
cc: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
David Howells
2017-11-02 15:27:44 +00:00
parent 81445e63e6
commit 5e4def2038
14 changed files with 37 additions and 98 deletions
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14
arch/mips/kernel/traps.c
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@@ -1233,18 +1233,6 @@ static int default_cu2_call(struct notifier_block *nfb, unsigned long action,
return NOTIFY_OK;
}
static int wait_on_fp_mode_switch(atomic_t *p)
{
/*
* The FP mode for this task is currently being switched. That may
* involve modifications to the format of this tasks FP context which
* make it unsafe to proceed with execution for the moment. Instead,
* schedule some other task.
*/
schedule();
return 0;
}
static int enable_restore_fp_context(int msa)
{
int err, was_fpu_owner, prior_msa;
@@ -1254,7 +1242,7 @@ static int enable_restore_fp_context(int msa)
* complete before proceeding.
*/
wait_on_atomic_t(&current->mm->context.fp_mode_switching,
wait_on_fp_mode_switch, TASK_KILLABLE);
atomic_t_wait, TASK_KILLABLE);
if (!used_math()) {
/* First time FP context user. */