linux-kernel - Re: [PATCH] ALSA: au88x0: remove some dead code

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 17 Apr 2020 11:05:06 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Jason Yan <yanaijie@...wei.com>
Cc:     <perex@...ex.cz>, <tiwai@...e.com>, <hariprasad.kelam@...il.com>,
        <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
        Hulk Robot <hulkci@...wei.com>
Subject: Re: [PATCH] ALSA: au88x0: remove some dead code

On Fri, 17 Apr 2020 11:22:32 +0200,
Jason Yan wrote:
> 
> Fix the following gcc warning:
> 
> sound/pci/au88x0/au88x0_a3ddata.c:62:25: warning: ‘A3dHrirDImpulse’
> defined but not used [-Wunused-const-variable=]
>  static const a3d_Hrtf_t A3dHrirDImpulse = {
>                          ^~~~~~~~~~~~~~~
> sound/pci/au88x0/au88x0_a3ddata.c:50:25: warning: ‘A3dHrirSatTest’
> defined but not used [-Wunused-const-variable=]
>  static const a3d_Hrtf_t A3dHrirSatTest = {
>                          ^~~~~~~~~~~~~~
> sound/pci/au88x0/au88x0_a3ddata.c:33:25: warning: ‘A3dHrirOnes’ defined
> but not used [-Wunused-const-variable=]
>  static const a3d_Hrtf_t A3dHrirOnes = {
>                          ^~~~~~~~~~~
> 
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Jason Yan <yanaijie@...wei.com>

I'd rather keep them but disable with #if 0, if it's only about the
minor compiler warnings.

The whole code is a result of reverse engineering and those dead code
are simply there just because of lack of testing.  Removing makes it
impossible for retesting (if any).


thanks,

Takashi

> ---
>  sound/pci/au88x0/au88x0_a3d.c     | 23 -------------------
>  sound/pci/au88x0/au88x0_a3ddata.c | 38 -------------------------------
>  2 files changed, 61 deletions(-)
> 
> diff --git a/sound/pci/au88x0/au88x0_a3d.c b/sound/pci/au88x0/au88x0_a3d.c
> index 2db183f8826a..4d3b79a34c69 100644
> --- a/sound/pci/au88x0/au88x0_a3d.c
> +++ b/sound/pci/au88x0/au88x0_a3d.c
> @@ -512,31 +512,8 @@ static void a3dsrc_ProgramPipe(a3dsrc_t * a)
>  	/* Single spike leads to identity transfer function. */
>  	a3dsrc_SetHrtfCurrent(a, A3dHrirImpulse, A3dHrirImpulse);
>  	a3dsrc_SetHrtfTarget(a, A3dHrirImpulse, A3dHrirImpulse);
> -
> -	/* Test: Sounds saturated. */
> -	//a3dsrc_SetHrtfCurrent(a, A3dHrirSatTest, A3dHrirSatTest);
> -	//a3dsrc_SetHrtfTarget(a, A3dHrirSatTest, A3dHrirSatTest);      
>  }
>  
> -/* VDB = Vortex audio Dataflow Bus */
> -#if 0
> -static void a3dsrc_ClearVDBData(a3dsrc_t * a, unsigned long aa)
> -{
> -	vortex_t *vortex = (vortex_t *) (a->vortex);
> -
> -	// ((aa >> 2) << 8) - (aa >> 2)
> -	hwwrite(vortex->mmio,
> -		a3d_addrS(a->slice, A3D_SLICE_VDBDest) + (a->source << 2), 0);
> -	hwwrite(vortex->mmio,
> -		a3d_addrS(a->slice,
> -			  A3D_SLICE_VDBDest + 4) + (a->source << 2), 0);
> -	/*
> -	   hwwrite(vortex->mmio, 0x19c00 + (((aa>>2)*255*4)+aa)*8, 0);
> -	   hwwrite(vortex->mmio, 0x19c04 + (((aa>>2)*255*4)+aa)*8, 0);
> -	 */
> -}
> -#endif
> -
>  /* A3D HwSource stuff. */
>  
>  static void vortex_A3dSourceHw_Initialize(vortex_t * v, int source, int slice)
> diff --git a/sound/pci/au88x0/au88x0_a3ddata.c b/sound/pci/au88x0/au88x0_a3ddata.c
> index 18623cb6bc52..cc41ea67a6d3 100644
> --- a/sound/pci/au88x0/au88x0_a3ddata.c
> +++ b/sound/pci/au88x0/au88x0_a3ddata.c
> @@ -30,44 +30,6 @@ static const a3d_Hrtf_t A3dHrirImpulse = {
>  	0, 0, 0
>  };
>  
> -static const a3d_Hrtf_t A3dHrirOnes = {
> -	0x7fff, 0x7fff, 0x7fff, 0x7fff, 0x7fff, 0x7fff, 0x7fff, 0x7fff,
> -	0x7fff,
> -	0x7fff,
> -	0x7fff, 0x7fff, 0x7fff, 0x7fff, 0x7fff, 0x7fff, 0x7fff, 0x7fff,
> -	0x7fff,
> -	0x7fff,
> -	0x7fff, 0x7fff, 0x7fff, 0x7fff, 0x7fff, 0x7fff, 0x7fff, 0x7fff,
> -	0x7fff, 0x7fff, 0x7fff, 0x7fff, 0x7fff, 0x7fff, 0x7fff, 0x7fff,
> -	0x7fff,
> -	0x7fff,
> -	0x7fff, 0x7fff, 0x7fff, 0x7fff, 0x7fff, 0x7fff, 0x7fff, 0x7fff,
> -	0x7fff,
> -	0x7fff,
> -	0x7fff, 0x7fff, 0x7fff, 0x7fff, 0x7fff, 0x7fff, 0x7fff, 0x7fff
> -};
> -
> -static const a3d_Hrtf_t A3dHrirSatTest = {
> -	0x7fff, 0x7fff, 0x7fff, 0x7fff, 0x7fff, 0x7fff, 0x7fff, 0x7fff,
> -	0x7fff,
> -	0x7fff,
> -	0x8001, 0x8001, 0x8001, 0x8001, 0x8001, 0x8001, 0x8001, 0x8001,
> -	0x8001,
> -	0x8001,
> -	0x7fff, 0x0000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
> -	0, 0, 0,
> -	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
> -};
> -
> -static const a3d_Hrtf_t A3dHrirDImpulse = {
> -	0, 0x7fff, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
> -	0, 0, 0,
> -	0, 0, 0, 0,
> -	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
> -	0, 0, 0,
> -	0, 0, 0
> -};
> -
>  static const a3d_ItdDline_t A3dItdDlineZeros = {
>  	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
>  	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
> -- 
> 2.21.1
>