objpool: fix to make percpu slot allocation more robust

Since gfp & GFP_ATOMIC == GFP_ATOMIC is true for GFP_KERNEL | GFP_HIGH, it
will use kmalloc if user specifies that combination.  Here the reason why
combining the __vmalloc_node() and kmalloc_node() is that the vmalloc does
not support all GFP flag, especially GFP_ATOMIC.  So we should check if
gfp & (GFP_ATOMIC | GFP_KERNEL) != GFP_ATOMIC for vmalloc first.  This
ensures caller can sleep.  And for the robustness, even if vmalloc fails,
it should retry with kmalloc to allocate it.

Link: https://lkml.kernel.org/r/173008598713.1262174.2959179484209897252.stgit@mhiramat.roam.corp.google.com
Fixes: aff1871bfc81 ("objpool: fix choosing allocation for percpu slots")
Signed-off-by: Masami Hiramatsu (Google) <[email protected]>
Reported-by: Linus Torvalds <[email protected]>
Closes: https://lore.kernel.org/all/CAHk-=whO+vSH+XVRio8byJU8idAWES0SPGVZ7KAVdc4qrV0VUA@mail.gmail.com/
Cc: Leo Yan <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Matt Wu <[email protected]>
Cc: Mikel Rychliski <[email protected]>
Cc: Steven Rostedt (Google) <[email protected]>
Cc: Viktor Malik <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions