Re: [PATCH 0/7] globalvar: add multiple device support

[Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>]

On 11:08 Sun 27 Jan     , Sascha Hauer wrote:
> On Sat, Jan 26, 2013 at 12:53:26AM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote:
> > HI,
> > 
> > 	this will allow to reduce the scope of device and params to search
> > 	during boot time
> > 
> > 	we keep the retro compatibility
> > 
> > The following changes since commit 2c93912f34ce06585c4ede0298aef7225e096df2:
> > 
> >   atmel_mci: gpio: request and configure card detect (2013-01-25 19:52:44 +0100)
> > 
> > are available in the git repository at:
> > 
> >   git://git.jcrosoft.org/barebox.git delivery/globalvar
> 
> When compiling this I get:
> 
> common/bootargs.c: In function 'linux_bootargs_get':
> common/bootargs.c:50:2: warning: passing argument 1 of 'global_get_match' from incompatible pointer type [enabled by default]
> In file included from common/bootargs.c:23:0:
> include/globalvar.h:19:7: note: expected 'struct device_d *' but argument is of type 'char *'
> common/bootargs.c:54:2: warning: passing argument 1 of 'global_get_match' from incompatible pointer type [enabled by default]
> In file included from common/bootargs.c:23:0:
> include/globalvar.h:19:7: note: expected 'struct device_d *' but argument is of type 'char *'
> common/bootargs.c: In function 'bootargs_init':
> common/bootargs.c:83:19: warning: assignment from incompatible pointer type [enabled by default]
> 
> When starting this I get:
> 
> unable to handle NULL pointer dereference at address 0x00000068
> pc : [<a7f1f928>]    lr : [<a7f1faf8>]
> sp : a6effc18  ip : 00000002  fp : 00000000
> r10: a6ffdf2c  r9 : a6ffd704  r8 : a6ffb009
> r7 : 00000000  r6 : 00000000  r5 : 00000000  r4 : 00000000
> r3 : 00000000  r2 : 00000000  r1 : a6ffb009  r0 : 00000000
> Flags: nZCv  IRQs off  FIQs off  Mode SVC_32
> [<a7f1f928>] (get_param_by_name+0xc/0xb4) from [<a7f1faf8>] (dev_add_param+0x18/0x94)
> [<a7f1faf8>] (dev_add_param+0x18/0x94) from [<a7f07800>] (global_add_simple+0x14/0x18)
> [<a7f07800>] (global_add_simple+0x14/0x18) from [<a7f0789c>] (globalvar_add_simple+0x98/0xb0)
> [<a7f0789c>] (globalvar_add_simple+0x98/0xb0) from [<a7f1e438>] (do_global+0x110/0x188)
> [<a7f1e438>] (do_global+0x110/0x188) from [<a7f05940>] (execute_command+0x38/0x78)
> [<a7f05940>] (execute_command+0x38/0x78) from [<a7f02150>] (run_list_real+0x7e0/0x938)
> [<a7f02150>] (run_list_real+0x7e0/0x938) from [<a7f01798>] (parse_stream_outer+0x198/0x270)
> [<a7f01798>] (parse_stream_outer+0x198/0x270) from [<a7f0190c>] (parse_string_outer+0x9c/0x100)
> [<a7f0190c>] (parse_string_outer+0x9c/0x100) from [<a7f022e8>] (source_script+0x40/0x78)
> ...
> 
> Overall I'm not sure this is worth it. I did some measurements on a
> 400MHz ARM9 board. From startup until booting the kernel barebox spends
> about 5.5ms in getenv/setenv. This can be reduced quite easily to 3ms
> by moving globalvar_init to a core_initcall.
> 
> Anyway, the series is not mergable as is. Also the search through subdevices
> of the globalvar device seems to have some undesirable side effects.
 
I test here no issue wired

I test also here with more global ar about 100

I found 200ms diff on the all boot (cold start)

which for my case is critical

which config do you use?

Best Regards,
J.
> 
> Sascha
> 
> 
> 
> -- 
> Pengutronix e.K.                           |                             |
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