linux-kernel - Re: [PATCH 10/26] tpm: constify local structures

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Message-ID: <alpine.DEB.2.10.1609121046250.3049@hadrien>
Date:   Mon, 12 Sep 2016 10:47:49 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
cc:     Peter Huewe <peterhuewe@....de>, joe@...ches.com,
        kernel-janitors@...r.kernel.org,
        Marcel Selhorst <tpmdd@...horst.net>,
        Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
        tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/26] tpm: constify local structures



On Sun, 11 Sep 2016, Jarkko Sakkinen wrote:

> On Sun, Sep 11, 2016 at 03:05:52PM +0200, Julia Lawall wrote:
> > For structure types defined in the same file or local header files, find
> > top-level static structure declarations that have the following
> > properties:
> > 1. Never reassigned.
> > 2. Address never taken
> > 3. Not passed to a top-level macro call
> > 4. No pointer or array-typed field passed to a function or stored in a
> > variable.
> > Declare structures having all of these properties as const.
> >
> > Done using Coccinelle.
> > Based on a suggestion by Joe Perches <joe@...ches.com>.
> >
> > Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
>
> To be frank I don't understand (at all) what you are trying to say in
> the commit message but change is still for better :)
>
> Can I rephrase the commit message: "Move TPM header structures to the
> .rodata section"? It should be obvious why that is for better for
> anyone.

Sorry.  I tried to explain what strategy I used to ensure the change was
OK.  If you want to change the commit message, then no problem.

julia

>
> Anyway, thanks for the effort.
>
> Acked-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
>
> /Jarkko
>
> > ---
> > The semantic patch seems too long for a commit log, but is in the cover
> > letter.
> >
> >  drivers/char/tpm/tpm-interface.c |   10 +++++-----
> >  drivers/char/tpm/tpm-sysfs.c     |    2 +-
> >  2 files changed, 6 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> > index 1abe2d7..e84888f 100644
> > --- a/drivers/char/tpm/tpm-interface.c
> > +++ b/drivers/char/tpm/tpm-interface.c
> > @@ -633,7 +633,7 @@ EXPORT_SYMBOL_GPL(tpm_get_timeouts);
> >  #define TPM_ORD_CONTINUE_SELFTEST 83
> >  #define CONTINUE_SELFTEST_RESULT_SIZE 10
> >
> > -static struct tpm_input_header continue_selftest_header = {
> > +static const struct tpm_input_header continue_selftest_header = {
> >  	.tag = TPM_TAG_RQU_COMMAND,
> >  	.length = cpu_to_be32(10),
> >  	.ordinal = cpu_to_be32(TPM_ORD_CONTINUE_SELFTEST),
> > @@ -659,7 +659,7 @@ static int tpm_continue_selftest(struct tpm_chip *chip)
> >
> >  #define TPM_ORDINAL_PCRREAD cpu_to_be32(21)
> >  #define READ_PCR_RESULT_SIZE 30
> > -static struct tpm_input_header pcrread_header = {
> > +static const struct tpm_input_header pcrread_header = {
> >  	.tag = TPM_TAG_RQU_COMMAND,
> >  	.length = cpu_to_be32(14),
> >  	.ordinal = TPM_ORDINAL_PCRREAD
> > @@ -745,7 +745,7 @@ EXPORT_SYMBOL_GPL(tpm_pcr_read);
> >   */
> >  #define TPM_ORD_PCR_EXTEND cpu_to_be32(20)
> >  #define EXTEND_PCR_RESULT_SIZE 34
> > -static struct tpm_input_header pcrextend_header = {
> > +static const struct tpm_input_header pcrextend_header = {
> >  	.tag = TPM_TAG_RQU_COMMAND,
> >  	.length = cpu_to_be32(34),
> >  	.ordinal = TPM_ORD_PCR_EXTEND
> > @@ -949,7 +949,7 @@ EXPORT_SYMBOL_GPL(wait_for_tpm_stat);
> >  #define TPM_ORD_SAVESTATE cpu_to_be32(152)
> >  #define SAVESTATE_RESULT_SIZE 10
> >
> > -static struct tpm_input_header savestate_header = {
> > +static const struct tpm_input_header savestate_header = {
> >  	.tag = TPM_TAG_RQU_COMMAND,
> >  	.length = cpu_to_be32(10),
> >  	.ordinal = TPM_ORD_SAVESTATE
> > @@ -1032,7 +1032,7 @@ int tpm_pm_resume(struct device *dev)
> >  EXPORT_SYMBOL_GPL(tpm_pm_resume);
> >
> >  #define TPM_GETRANDOM_RESULT_SIZE	18
> > -static struct tpm_input_header tpm_getrandom_header = {
> > +static const struct tpm_input_header tpm_getrandom_header = {
> >  	.tag = TPM_TAG_RQU_COMMAND,
> >  	.length = cpu_to_be32(14),
> >  	.ordinal = TPM_ORD_GET_RANDOM
> > diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c
> > index b46cf70..26fccad 100644
> > --- a/drivers/char/tpm/tpm-sysfs.c
> > +++ b/drivers/char/tpm/tpm-sysfs.c
> > @@ -22,7 +22,7 @@
> >
> >  #define READ_PUBEK_RESULT_SIZE 314
> >  #define TPM_ORD_READPUBEK cpu_to_be32(124)
> > -static struct tpm_input_header tpm_readpubek_header = {
> > +static const struct tpm_input_header tpm_readpubek_header = {
> >  	.tag = TPM_TAG_RQU_COMMAND,
> >  	.length = cpu_to_be32(30),
> >  	.ordinal = TPM_ORD_READPUBEK
> >
>