On Fri, 28 Dec 2018, LEROY Christophe wrote:
> Finn Thain <fth...@telegraphics.com.au> a ?crit?:
>
> > On powerpc, setting CONFIG_NVRAM=n builds a kernel with no NVRAM support.
> > Setting CONFIG_NVRAM=m enables the /dev/nvram misc device module without
> > enabling NVRAM support in drivers. Setting CONFIG_NVRAM=y enables the
> > misc device (built-in) and also enables NVRAM support in drivers.
> >
> > m68k shares the valkyriefb driver with powerpc, and since that driver uses
> > NVRAM, it is affected by CONFIG_ATARI_SCSI, because of the use of
> > "select NVRAM".
> >
> > Adopt the powerpc convention on m68k to avoid surprises.
> >
> > Signed-off-by: Finn Thain <fth...@telegraphics.com.au>
> > Tested-by: Christian T. Steigies <c...@debian.org>
> > ---
> > This patch temporarily disables CONFIG_NVRAM on Atari, to prevent build
> > failures when bisecting the rest of this patch series. It gets enabled
> > again with the introduction of CONFIG_HAVE_ARCH_NVRAM_OPS, once the
> > nvram_* global functions have been moved to an ops struct.
> > ---
> > drivers/char/Kconfig | 5 +----
> > drivers/scsi/Kconfig | 6 +++---
> > drivers/scsi/atari_scsi.c | 7 ++++---
> > 3 files changed, 8 insertions(+), 10 deletions(-)
> >
> > diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
> > index 9d03b2ff5df6..5b54595dfe30 100644
> > --- a/drivers/char/Kconfig
> > +++ b/drivers/char/Kconfig
> > @@ -236,7 +236,7 @@ source "drivers/char/hw_random/Kconfig"
> >
> > config NVRAM
> > tristate "/dev/nvram support"
> > - depends on ATARI || X86 || GENERIC_NVRAM
> > + depends on X86 || GENERIC_NVRAM
> > ---help---
> > If you say Y here and create a character special file /dev/nvram
> > with major number 10 and minor number 144 using mknod ("man mknod"),
> > @@ -254,9 +254,6 @@ config NVRAM
> > should NEVER idly tamper with it. See Ralf Brown's interrupt list
> > for a guide to the use of CMOS bytes by your BIOS.
> >
> > - On Atari machines, /dev/nvram is always configured and does not need
> > - to be selected.
> > -
> > To compile this driver as a module, choose M here: the
> > module will be called nvram.
> >
> > diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
> > index 640cd1b31a18..924eb69e7fc4 100644
> > --- a/drivers/scsi/Kconfig
> > +++ b/drivers/scsi/Kconfig
> > @@ -1381,14 +1381,14 @@ config ATARI_SCSI
> > tristate "Atari native SCSI support"
> > depends on ATARI && SCSI
> > select SCSI_SPI_ATTRS
> > - select NVRAM
> > ---help---
> > If you have an Atari with built-in NCR5380 SCSI controller (TT,
> > Falcon, ...) say Y to get it supported. Of course also, if you have
> > a compatible SCSI controller (e.g. for Medusa).
> >
> > - To compile this driver as a module, choose M here: the
> > - module will be called atari_scsi.
> > + To compile this driver as a module, choose M here: the module will
> > + be called atari_scsi. If you also enable NVRAM support, the SCSI
> > + host's ID is taken from the setting in TT RTC NVRAM.
> >
> > This driver supports both styles of NCR integration into the
> > system: the TT style (separate DMA), and the Falcon style (via
> > diff --git a/drivers/scsi/atari_scsi.c b/drivers/scsi/atari_scsi.c
> > index 89f5154c40b6..99e5729d910d 100644
> > --- a/drivers/scsi/atari_scsi.c
> > +++ b/drivers/scsi/atari_scsi.c
> > @@ -755,9 +755,10 @@ static int __init atari_scsi_probe(struct
> > platform_device *pdev)
> > if (ATARIHW_PRESENT(TT_SCSI) && setup_sg_tablesize >= 0)
> > atari_scsi_template.sg_tablesize = setup_sg_tablesize;
> >
> > - if (setup_hostid >= 0) {
> > + if (setup_hostid >= 0)
> > atari_scsi_template.this_id = setup_hostid & 7;
> > - } else {
> > +#ifdef CONFIG_NVRAM
> > + else
>
> Such ifdefs should be avoided in C files.
> It would be better to use
>
> } else if (IS_ENABLED(CONFIG_NVRAM)) {
>
I don't like #ifdefs either. However, as the maintainer of this file, I am
okay with this one.
The old #ifdef CONFIG_NVRAM conditional compilation convention that gets
used here and under drivers/video/fbdev could probably be improved upon
but I consider this to be out-of-scope for this series, which is
complicated enough.
And as explained in the commit log, CONFIG_NVRAM=y and CONFIG_NVRAM=m are
treaded differently by drivers. Therefore, IS_ENABLED would be incorrect.
--
> > /* Test if a host id is set in the NVRam */
> > if (ATARIHW_PRESENT(TT_CLK) && nvram_check_checksum()) {
> > unsigned char b = nvram_read_byte(16);
> > @@ -768,7 +769,7 @@ static int __init atari_scsi_probe(struct
> > platform_device *pdev)
> > if (b & 0x80)
> > atari_scsi_template.this_id = b & 7;
> > }
> > - }
> > +#endif
> >
> > /* If running on a Falcon and if there's TT-Ram (i.e., more than one
> > * memory block, since there's always ST-Ram in a Falcon), then
> > --
> > 2.19.2
>
>
>
