On 03/15/2016 12:24 AM, Arnd Bergmann wrote:
> gcc-6 warns about code in the nouveau driver that is obviously silly:
>
> drivers/gpu/drm/nouveau/nvkm/engine/pm/nv40.c: In function 'nv40_perfctr_next':
> drivers/gpu/drm/nouveau/nvkm/engine/pm/nv40.c:62:19: warning: self-comparison always evaluats to false [-Wtautological-compare]
> if (pm->sequence != pm->sequence) {
>
> The behavior was accidentally introduced in a patch described as "This is
> purely preparation for upcoming commits, there should be no code changes here.".
> As far as I can tell, that was true for the rest of that patch except for
> this one function, which has been changed to a NOP.
>
> This patch restores the original behavior.
>
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> Fixes: 8c1aeaa13954 ("drm/nouveau/pm: cosmetic changes")
Reviewed-by: Ben Skeggs <bskeggs@xxxxxxxxxx>
> ---
> drivers/gpu/drm/nouveau/nvkm/engine/pm/nv40.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/pm/nv40.c b/drivers/gpu/drm/nouveau/nvkm/engine/pm/nv40.c
> index 4bef72a9d106..3fda594700e0 100644
> --- a/drivers/gpu/drm/nouveau/nvkm/engine/pm/nv40.c
> +++ b/drivers/gpu/drm/nouveau/nvkm/engine/pm/nv40.c
> @@ -59,9 +59,11 @@ static void
> nv40_perfctr_next(struct nvkm_pm *pm, struct nvkm_perfdom *dom)
> {
> struct nvkm_device *device = pm->engine.subdev.device;
> - if (pm->sequence != pm->sequence) {
> + struct nv40_pm *nv40pm = container_of(pm, struct nv40_pm, base);
> +
> + if (nv40pm->sequence != pm->sequence) {
> nvkm_wr32(device, 0x400084, 0x00000020);
> - pm->sequence = pm->sequence;
> + nv40pm->sequence = pm->sequence;
> }
> }
>
>
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