Re: [2.6 patch] i386: always use 4k stacks

[Adrian Bunk]

On Wed, Nov 16, 2005 at 02:03:50AM +0000, Kenneth Parrish wrote:
> -=> In article 15 Nov 05  15:00:28, Adrian Bunk wrote to All <=-
> 
> [...]
>  AB> Unconditionally enabling 4k stacks is the only way to achieve
>  AB> this.
> :) 2K might do here..

No, it wouldn't.

If one function calls another function you have to add the stack usages.

> 5 Tue Nov 15 19:29:43 ~/build/kernel/linux-2.6.15-rc1-git3 $ make checkstack
> objdump -d vmlinux $(find . -name '*.ko') | \
> perl /home/ken/build/kernel/linux-2.6.15-rc1-git3/scripts/checkstack.pl i386
> 0xc02bd528 huft_build:                                  1432
> 0xc02bd954 huft_build:                                  1432
> 0xc02be1c4 inflate_dynamic:                             1312
> 0xc02be2ff inflate_dynamic:                             1312
> 0xc02be082 inflate_fixed:                               1168
> 0xc02be172 inflate_fixed:                               1168
>...

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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