Messages in this thread | | | Date | Fri, 5 Sep 2014 14:58:16 +0100 | From | Mark Rutland <> | Subject | Re: [PATCH] ARM: /proc/cpuinfo: Use DT machine name when possible |
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On Fri, Sep 05, 2014 at 02:52:05PM +0100, Pali Rohár wrote: > On Friday 05 September 2014 15:45:42 Mark Rutland wrote: > > On Fri, Sep 05, 2014 at 12:38:40PM +0100, Pali Rohár wrote: > > > On Wednesday 18 June 2014 18:54:24 Pali Rohár wrote: > > > > Machine name from board description is some generic name > > > > on DT kernel. DT provides machine name property which is > > > > specific for board, so use it instead generic one when > > > > possible. > > > > > > > > Signed-off-by: Pali Rohár <pali.rohar@gmail.com> > > > > --- > > > > > > > > arch/arm/kernel/setup.c | 7 +++++-- > > > > 1 file changed, 5 insertions(+), 2 deletions(-) > > > > > > > > diff --git a/arch/arm/kernel/setup.c > > > > b/arch/arm/kernel/setup.c index 8a16ee5..fbc7b4f 100644 > > > > --- a/arch/arm/kernel/setup.c > > > > +++ b/arch/arm/kernel/setup.c > > > > @@ -875,10 +875,13 @@ void __init setup_arch(char > > > > **cmdline_p) > > > > > > > > setup_processor(); > > > > mdesc = setup_machine_fdt(__atags_pointer); > > > > > > > > - if (!mdesc) > > > > + if (mdesc) > > > > + machine_name = of_flat_dt_get_machine_name(); > > > > + else > > > > > > > > mdesc = setup_machine_tags(__atags_pointer, > > > > > > > > __machine_arch_type); machine_desc = mdesc; > > > > - machine_name = mdesc->name; > > > > + if (!machine_name) > > > > + machine_name = mdesc->name; > > > > > > > > if (mdesc->reboot_mode != REBOOT_HARD) > > > > > > > > reboot_mode = mdesc->reboot_mode; > > > > > > So, do you really want to break userspace which reading file > > > /proc/cpuinfo (after migration from boardcode --> DT)? > > > > You have no guarantee model name in the DT == the name in a > > board file anyhow, and trying to force that is wrong. So > > further to Russell's reply, I must NAK this from a DT > > perspective. > > > > Realistically your userspace is already broken if relying on > > such things. You built something that only ever worked for a > > particular arbitrary string. So it was already broken for > > every other board, and there was never any guarantee that new > > boards where your userspace could have worked would share the > > same name. > > > > You're trying to fix the wrong side of the equation. > > > > Mark. > > So what is your suggestion for identifing board (name/type) which > will work with any kernel (and will not be broken again by kernel > later)?
Without knowing your use case I have no idea if that's even a sane thing to do.
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