Re: [PATCH v10 4/5] QE/CPM: move muram management functions to qe_common

[Scott Wood <scottwood@freescale.com>]

On Mon, 2015-09-21 at 22:22 -0500, Zhao Qiang-B45475 wrote:
> On Tue, Sep 22, 2015 at 11:08AM +0800, Wood Scott-B07421 wrote:
> 
> > -----Original Message-----
> > From: Wood Scott-B07421
> > Sent: Tuesday, September 22, 2015 11:08 AM
> > To: Zhao Qiang-B45475
> > Cc: linux-kernel@vger.kernel.org; linuxppc-dev@lists.ozlabs.org;
> > lauraa@codeaurora.org; Xie Xiaobo-R63061; benh@kernel.crashing.org; Li
> > Yang-Leo-R58472; paulus@samba.org
> > Subject: Re: [PATCH v10 4/5] QE/CPM: move muram management functions to
> > qe_common
> > 
> > On Mon, 2015-09-21 at 22:06 -0500, Zhao Qiang-B45475 wrote:
> > > On Tue, Sep 22, 2015 at 10:26AM +0800, Wood Scott-B07421 wrote:
> > > 
> > > > -----Original Message-----
> > > > From: Wood Scott-B07421
> > > > Sent: Tuesday, September 22, 2015 10:26 AM
> > > > To: Zhao Qiang-B45475
> > > > Cc: linux-kernel@vger.kernel.org; linuxppc-dev@lists.ozlabs.org;
> > > > lauraa@codeaurora.org; Xie Xiaobo-R63061; benh@kernel.crashing.org;
> > > > Li Yang-Leo-R58472; paulus@samba.org
> > > > Subject: Re: [PATCH v10 4/5] QE/CPM: move muram management functions
> > > > to qe_common
> > > > 
> > > > On Mon, 2015-09-21 at 21:23 -0500, Zhao Qiang-B45475 wrote:
> > > > > On Tue, Sep 22, 2015 at 06:54AM +0800, Wood Scott-B07421 wrote:
> > > > > > -----Original Message-----
> > > > > > From: Wood Scott-B07421
> > > > > > Sent: Tuesday, September 22, 2015 6:54 AM
> > > > > > To: Zhao Qiang-B45475
> > > > > > Cc: linux-kernel@vger.kernel.org; linuxppc-dev@lists.ozlabs.org;
> > > > > > lauraa@codeaurora.org; Xie Xiaobo-R63061;
> > > > > > benh@kernel.crashing.org; Li Yang-Leo-R58472; paulus@samba.org
> > > > > > Subject: Re: [PATCH v10 4/5] QE/CPM: move muram management
> > > > > > functions to qe_common
> > > > > > 
> > > > > > On Fri, Sep 18, 2015 at 03:15:20PM +0800, Zhao Qiang wrote:
> > > > > > > QE and CPM have the same muram, they use the same management
> > > > > > > functions. Now QE support both ARM and PowerPC, it is
> > > > > > > necessary to move QE to "driver/soc", so move the muram
> > > > > > > management functions from cpm_common to qe_common for
> > > > > > > preparing to move QE code to
> > > > "driver/soc"
> > > > > > > 
> > > > > > > Signed-off-by: Zhao Qiang <qiang.zhao@freescale.com>
> > > > > > > ---
> > > > > > > Changes for v2:
> > > > > > >   - no changes
> > > > > > > Changes for v3:
> > > > > > >   - no changes
> > > > > > > Changes for v4:
> > > > > > >   - no changes
> > > > > > > Changes for v5:
> > > > > > >   - no changes
> > > > > > > Changes for v6:
> > > > > > >   - using genalloc instead rheap to manage QE MURAM
> > > > > > >   - remove qe_reset from platform file, using
> > > > > > >   - subsys_initcall to call qe_init function.
> > > > > > 
> > > > > > Why is the init change in the same patch as moving the muram code?
> > > > > > 
> > > > > > > Changes for v7:
> > > > > > >   - move this patch from 3/3 to 2/3
> > > > > > >   - convert cpm with genalloc
> > > > > > >   - check for gen_pool allocation failure Changes for v8:
> > > > > > >   - rebase
> > > > > > >   - move BD_SC_* macro instead of copy Changes for v9:
> > > > > > >   - doesn't modify CPM, add a new patch to modify.
> > > > > > >   - rebase
> > > > > > > Changes for v10:
> > > > > > >   - rebase
> > > > > > > 
> > > > > > >  arch/powerpc/include/asm/cpm.h            |  59 --------
> > > > > > >  arch/powerpc/include/asm/qe.h             |  51 ++++++-
> > > > > > >  arch/powerpc/platforms/83xx/km83xx.c      |   2 -
> > > > > > >  arch/powerpc/platforms/83xx/mpc832x_mds.c |   2 -
> > > > > > >  arch/powerpc/platforms/83xx/mpc832x_rdb.c |   2 -
> > > > > > >  arch/powerpc/platforms/83xx/mpc836x_mds.c |   2 -
> > > > > > >  arch/powerpc/platforms/83xx/mpc836x_rdk.c |   3 -
> > > > > > >  arch/powerpc/platforms/85xx/common.c      |   1 -
> > > > > > >  arch/powerpc/sysdev/cpm_common.c          | 206 +-------------
> > ----
> > > > ----
> > > > > > ---
> > > > > > >  arch/powerpc/sysdev/qe_lib/Makefile       |   2 +-
> > > > > > >  arch/powerpc/sysdev/qe_lib/qe.c           |  15 ++
> > > > > > >  arch/powerpc/sysdev/qe_lib/qe_common.c    | 242
> > > > > > ++++++++++++++++++++++++++++++
> > > > > > >  12 files changed, 302 insertions(+), 285 deletions(-)  create
> > > > > > > mode
> > > > > > > 100644 arch/powerpc/sysdev/qe_lib/qe_common.c
> > > > > > > 
> > > > > > > diff --git a/arch/powerpc/include/asm/cpm.h
> > > > > > > b/arch/powerpc/include/asm/cpm.h index 4398a6c..003a736 100644
> > > > > > > --- a/arch/powerpc/include/asm/cpm.h
> > > > > > > +++ b/arch/powerpc/include/asm/cpm.h
> > > > > > > @@ -93,22 +93,6 @@ typedef struct cpm_buf_desc {
> > > > > > >   */
> > > > > > > 
> > > > > > >  #define BD_SC_EMPTY      (0x8000)        /* Receive is empty
> > */
> > > > > > > -#define BD_SC_READY      (0x8000)        /* Transmit is ready
> > */
> > > > > > > -#define BD_SC_WRAP       (0x2000)        /* Last buffer
> > descriptor
> > > > */
> > > > > > > -#define BD_SC_INTRPT     (0x1000)        /* Interrupt on
> > change */
> > > > > > > -#define BD_SC_LAST       (0x0800)        /* Last buffer in
> > frame
> > > > */
> > > > > > > -#define BD_SC_TC (0x0400)        /* Transmit CRC */
> > > > > > > -#define BD_SC_CM (0x0200)        /* Continuous mode */
> > > > > > > -#define BD_SC_ID (0x0100)        /* Rec'd too many idles */
> > > > > > > -#define BD_SC_P          (0x0100)        /* xmt preamble */
> > > > > > > -#define BD_SC_BR (0x0020)        /* Break received */
> > > > > > > -#define BD_SC_FR (0x0010)        /* Framing error */
> > > > > > > -#define BD_SC_PR (0x0008)        /* Parity error */
> > > > > > > -#define BD_SC_NAK        (0x0004)        /* NAK - did not
> > respond
> > > > */
> > > > > > > -#define BD_SC_OV (0x0002)        /* Overrun */
> > > > > > > -#define BD_SC_UN (0x0002)        /* Underrun */
> > > > > > > -#define BD_SC_CD (0x0001)        /* */
> > > > > > > -#define BD_SC_CL (0x0001)        /* Collision */
> > > > > > 
> > > > > > What does this have to do with muram?
> > > > > 
> > > > > BD is Buffer Descriptors, it is in muram.
> > > > 
> > > > What does it have to do with the muram *allocator*?
> > > > 
> > > > > > 
> > > > > > I've said many times now that any changes to the code, including
> > > > > > renaming functions, needs to be a separate patch from moving the
> > code.
> > > > > 
> > > > > I have split a patch to two patches, However, Maybe I
> > > > > misunderstand your means.
> > > > 
> > > > I didn't say "split it into two patches, however you like".  I said
> > > > to have all changes in one patch, and the other patch be nothing but
> > a move.
> > > > Renaming the functions counts as a change.
> > > > 
> > > > > So if the patch just do the renaming and moving cpm_muram function
> > > > > to qe_muram function, Does it ok?
> > > > 
> > > > No.
> > > 
> > > Why?
> > 
> > So that I can see the changes as a diff.
> > 
> > > Moving cpm/qe_muram functions and renaming can't be split.
> > 
> > Why not?
> 
> If moving cpm_muram_* to qe_muram_* without renaming, 
> It still is "#define qe_muram_init cpm_muram_init",
> Where to find cpm_muram_*? 

Could you be more specific about what the actual problem is?  If you're 
talking about the fact that, for just one commit in the history, there will 
be a file with "qe" in the name that has functions with "cpm" in the name, 
who cares?

-Scott