[PATCH] objpool: fix minimum alignment of 'struct objpool_slot'

[Arnd Bergmann]

From: Arnd Bergmann <arnd@xxxxxxxx>

Members of objpool_slot get passed into try_cmpxchg_release(),
which does not work on most architectures unless they are
naturally aligned. Marking the structure as packed makes it
only byte-aligned, as shown by this (normally disabled) warning:

include/linux/objpool.h:156:56: warning: taking address of packed member of 'struct objpool_slot' may result in an unaligned pointer value [-Waddress-of-packed-member]
  156 |                 if (try_cmpxchg_release(&slot->head, &head, head + 1))
      |                                                       ~^~~~~~~~~~~~

As the struct members are all tightly packed on all architectures,
Just remove the '__packed annotation to give it the required
alignment of the native word size.

Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
 include/linux/objpool.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/objpool.h b/include/linux/objpool.h
index b713a1fe7521..f678b35b20b1 100644
--- a/include/linux/objpool.h
+++ b/include/linux/objpool.h
@@ -56,7 +56,7 @@ struct objpool_slot {
 	uint32_t            last;
 	uint32_t            mask;
 	void               *entries[];
-} __packed;
+};
 
 struct objpool_head;
 
-- 
2.39.5