Thanks for Emil's suggestion. You are right, we need make sure structure size aligned on 8 bytes, which is important for 32bit-64bit compatible case.
Fei -----Original Message----- From: Emil Velikov [mailto:emil.l.velikov@gmail.com] Sent: Thursday, October 16, 2014 11:20 PM To: Cheng, Yao; intel-gfx@lists.freedesktop.org Cc: emil.l.velikov@gmail.com; Jiang, Fei; dri-devel@lists.freedesktop.org; Vetter, Daniel Subject: Re: [RFC PATCH 3/3] libdrm: user mode helper for ipvr drm driver
On 16/10/14 15:33, Cheng, Yao wrote:
Hi Emil, Sorry, what do you mean by "correctly aligned"? does it mean the paddings in this data structure?
Afaict for compatibility reasons the struct size have to be "aligned" (multiple of 8 bytes), or if you prefer - the struct is missing the required padding :) I've only skimmed through the patch so it may be that other structs are having this issue.
Cheers, Emil
-----Original Message----- From: Emil Velikov [mailto:emil.l.velikov@gmail.com] Sent: Wednesday, October 15, 2014 5:24 PM To: Cheng, Yao; intel-gfx@lists.freedesktop.org Cc: emil.l.velikov@gmail.com; Jiang, Fei; dri-devel@lists.freedesktop.org; Vetter, Daniel Subject: Re: [RFC PATCH 3/3] libdrm: user mode helper for ipvr drm driver
Hi Yao,
struct drm_ipvr_gem_userptr does not seem to be correctly aligned - is that intentional ? Might be worth checking if anything else in ipvr_drm.h and ipvr_bufmgr.h is in the same boat.
Cheers, Emil