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freezer,umh: Clean up freezer/initrd interaction

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handle_initrd() marks itself as PF_FREEZER_SKIP in order to ensure
that the UMH, which is going to freeze the system, doesn't
indefinitely wait for it's caller.

Rework things by adding UMH_FREEZABLE to indicate the completion is
freezable.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://lore.kernel.org/r/20220822114648.791019324@infradead.org
This commit is contained in:
Peter Zijlstra 2022-08-22 13:18:18 +02:00
parent 5950e5d574
commit 1fbcaa923c
3 changed files with 14 additions and 13 deletions
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9
include/linux/umh.h
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@ -11,10 +11,11 @@
struct cred;
struct file;
#define UMH_NO_WAIT 0 /* don't wait at all */
#define UMH_WAIT_EXEC 1 /* wait for the exec, but not the process */
#define UMH_WAIT_PROC 2 /* wait for the process to complete */
#define UMH_KILLABLE 4 /* wait for EXEC/PROC killable */
#define UMH_NO_WAIT 0x00 /* don't wait at all */
#define UMH_WAIT_EXEC 0x01 /* wait for the exec, but not the process */
#define UMH_WAIT_PROC 0x02 /* wait for the process to complete */
#define UMH_KILLABLE 0x04 /* wait for EXEC/PROC killable */
#define UMH_FREEZABLE 0x08 /* wait for EXEC/PROC freezable */
struct subprocess_info {
struct work_struct work;