linux-kernel - RE: [PATCH v10 4/5] QE/CPM: move muram management functions to qe

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Message-ID: <SN1PR0301MB1550935F85F15E24A7505E999B450@SN1PR0301MB1550.namprd03.prod.outlook.com>
Date:	Tue, 22 Sep 2015 03:22:04 +0000
From:	Zhao Qiang <qiang.zhao@...escale.com>
To:	Scott Wood <scottwood@...escale.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"lauraa@...eaurora.org" <lauraa@...eaurora.org>,
	Xiaobo Xie <X.Xie@...escale.com>,
	"benh@...nel.crashing.org" <benh@...nel.crashing.org>,
	Li Leo <LeoLi@...escale.com>,
	"paulus@...ba.org" <paulus@...ba.org>
Subject: RE: [PATCH v10 4/5] QE/CPM: move muram management functions to
 qe_common

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@...r.kernel.org; linuxppc-dev@...ts.ozlabs.org;
> lauraa@...eaurora.org; Xie Xiaobo-R63061; benh@...nel.crashing.org; Li
> Yang-Leo-R58472; paulus@...ba.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@...r.kernel.org; linuxppc-dev@...ts.ozlabs.org;
> > > lauraa@...eaurora.org; Xie Xiaobo-R63061; benh@...nel.crashing.org;
> > > Li Yang-Leo-R58472; paulus@...ba.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@...r.kernel.org; linuxppc-dev@...ts.ozlabs.org;
> > > > > lauraa@...eaurora.org; Xie Xiaobo-R63061;
> > > > > benh@...nel.crashing.org; Li Yang-Leo-R58472; paulus@...ba.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@...escale.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_*? 

> 
> -Scott
>