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| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-03-01 18:22:38 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-03-19 15:00:34 +0100 |
| commit | 8e6b85945155da5af95dc0fa58ae38b86428deea (patch) | |
| tree | d1c21953d9c5e3018baec98d6cc76bd24c6b1771 /include/linux/usb.h | |
| parent | 9e98c678c2d6ae3a17cb2de55d17f69dddaa231b (diff) | |
| download | linux-8e6b85945155da5af95dc0fa58ae38b86428deea.tar.gz linux-8e6b85945155da5af95dc0fa58ae38b86428deea.tar.bz2 linux-8e6b85945155da5af95dc0fa58ae38b86428deea.zip | |
USB: usb.h: tweak struct urb to remove wasted space
By moving one field around in 'struct urb' we reduce the size of the
structure by 8 bytes.
Before the patch on x86_64 the overall size of the structure as reported
by pahole was:
/* size: 192, cachelines: 3, members: 30 */
/* sum members: 184, holes: 2, sum holes: 8 */
After the patch we now have:
/* size: 184, cachelines: 3, members: 30 */
/* last cacheline: 56 bytes */
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/usb.h')
| -rw-r--r-- | include/linux/usb.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/usb.h b/include/linux/usb.h index 5e49e82c4368..4229eb74bd2c 100644 --- a/include/linux/usb.h +++ b/include/linux/usb.h @@ -1545,10 +1545,10 @@ typedef void (*usb_complete_t)(struct urb *); struct urb { /* private: usb core and host controller only fields in the urb */ struct kref kref; /* reference count of the URB */ + int unlinked; /* unlink error code */ void *hcpriv; /* private data for host controller */ atomic_t use_count; /* concurrent submissions counter */ atomic_t reject; /* submissions will fail */ - int unlinked; /* unlink error code */ /* public: documented fields in the urb that can be used by drivers */ struct list_head urb_list; /* list head for use by the urb's |