Daniel, what you are talking about is totally wrong. 1) AFAIK, only one zero-size array can be in the end of a struct. 2) two struct_size will add up struct itself twice. the sum is wrong then. No offense. I can't help feeling lucky that you are in intel. 发件人: Daniel Vetter <daniel.vetter@xxxxxxxx> 代表 Daniel Vetter <daniel@xxxxxxxx> 发送时间: 2019年5月21日 0:28 收件人: Pan, Xinhui 抄送: Deucher, Alexander; Koenig, Christian; Zhou, David(ChunMing); airlied@xxxxxxxx; daniel@xxxxxxxx; Quan, Evan; xiaolinkui; amd-gfx@xxxxxxxxxxxxxxxxxxxxx; dri-devel@xxxxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx 主题: Re: [PATCH] gpu: drm: use struct_size() in kmalloc() [CAUTION: External Email] On Fri, May 17, 2019 at 04:44:30PM +0000, Pan, Xinhui wrote: > I am going to put more members which are also array after this struct, > not only obj[]. Looks like this struct_size did not help on multiple > array case. Thanks anyway. ________________________________ You can then add them up, e.g. kmalloc(struct_size()+struct_size(), GFP_KERNEL), so this patch here still looks like a good idea. Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx> Cheers, Daniel > From: xiaolinkui <xiaolinkui@xxxxxxxxxx> > Sent: Friday, May 17, 2019 4:46:00 PM > To: Deucher, Alexander; Koenig, Christian; Zhou, David(ChunMing); airlied@xxxxxxxx; daniel@xxxxxxxx; Pan, Xinhui; Quan, Evan > Cc: amd-gfx@xxxxxxxxxxxxxxxxxxxxx; dri-devel@xxxxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; xiaolinkui@xxxxxxxxxx > Subject: [PATCH] gpu: drm: use struct_size() in kmalloc() > > [CAUTION: External Email] > > Use struct_size() helper to keep code simple. > > Signed-off-by: xiaolinkui <xiaolinkui@xxxxxxxxxx> > --- > drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c | 3 +-- > 1 file changed, 1 insertion(+), 2 deletions(-) > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c > index 22bd21e..4717a64 100644 > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c > @@ -1375,8 +1375,7 @@ int amdgpu_ras_init(struct amdgpu_device *adev) > if (con) > return 0; > > - con = kmalloc(sizeof(struct amdgpu_ras) + > - sizeof(struct ras_manager) * AMDGPU_RAS_BLOCK_COUNT, > + con = kmalloc(struct_size(con, objs, AMDGPU_RAS_BLOCK_COUNT), > GFP_KERNEL|__GFP_ZERO); > if (!con) > return -ENOMEM; > -- > 2.7.4 > > > -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch _______________________________________________ amd-gfx mailing list amd-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/amd-gfx
