RE: 1 GB lowmem
Kumar Gala wrote: > something like that would be good. is there really anything PPC32 > specific about it? Apparently. The Kconfig option is only available for arch/powerpc and arch/ppc, and the only place in the whole codetree where CONFIG_TASK_SIZE is used is that particular spot in asm-powerpc/processor.h, and that again is within CONFIG_PPC32 define, so it seems only PPC32 is using TASK_SIZE. ___ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
FW: 1 GB lowmem
Kumar Gala wrote: > On May 21, 2008, at 4:24 PM, Rune Torgersen wrote: > >> Kumar Gala wrote: >>> On May 21, 2008, at 3:55 PM, Rune Torgersen wrote: Argh... Found it. Had to set CONFIG_TASK_SIZE to 0x8000. Now it works in both vaniulla an d RT kernel. >>> >>> We should really add some sanity check on CONFIG_TASK_SIZE vs >>> KERNEL_START. >> >> Something like this? >> Wording sould probablyy be a bit different/cleare. >> >> diff --git a/include/asm-powerpc/processor.h >> b/include/asm-powerpc/processor.h >> index fd98ca9..72e0e3f 100644 >> --- a/include/asm-powerpc/processor.h >> +++ b/include/asm-powerpc/processor.h >> @@ -81,6 +81,10 @@ extern struct task_struct *last_task_used_altivec; >> extern struct task_struct *last_task_used_spe; >> >> #ifdef CONFIG_PPC32 >> + >> +#if CONFIG_TASK_SIZE > CONFIG_KERNEL_START >> +#error User TASK_SIZE overlaps with KERNEL_START address >> +#endif >> #define TASK_SIZE (CONFIG_TASK_SIZE) >> >> /* This decides where the kernel will search for a free chunk of vm >> > > something like that would be good. is there really anything PPC32 > specific about it? > Probably not. Could this be done in the Kconfig file instead?. Don't know if Kconfig supports doing a comparison. ___ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
RE: 1 GB lowmem
Kumar Gala wrote: > On May 21, 2008, at 4:24 PM, Rune Torgersen wrote: > >> Kumar Gala wrote: >>> On May 21, 2008, at 3:55 PM, Rune Torgersen wrote: Argh... Found it. Had to set CONFIG_TASK_SIZE to 0x8000. Now it works in both vaniulla an d RT kernel. >>> >>> We should really add some sanity check on CONFIG_TASK_SIZE vs >>> KERNEL_START. >> >> Something like this? >> Wording sould probablyy be a bit different/cleare. >> >> diff --git a/include/asm-powerpc/processor.h >> b/include/asm-powerpc/processor.h >> index fd98ca9..72e0e3f 100644 >> --- a/include/asm-powerpc/processor.h >> +++ b/include/asm-powerpc/processor.h >> @@ -81,6 +81,10 @@ extern struct task_struct *last_task_used_altivec; >> extern struct task_struct *last_task_used_spe; >> >> #ifdef CONFIG_PPC32 >> + >> +#if CONFIG_TASK_SIZE > CONFIG_KERNEL_START >> +#error User TASK_SIZE overlaps with KERNEL_START address >> +#endif >> #define TASK_SIZE (CONFIG_TASK_SIZE) >> >> /* This decides where the kernel will search for a free chunk of vm >> > > something like that would be good. is there really anything PPC32 > specific about it? > Probably not. Could this be done in the Kconfig file instead?. Don't know if Kconfig supports doing a comparison. ___ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
Re: 1 GB lowmem
On May 21, 2008, at 4:24 PM, Rune Torgersen wrote: Kumar Gala wrote: On May 21, 2008, at 3:55 PM, Rune Torgersen wrote: Argh... Found it. Had to set CONFIG_TASK_SIZE to 0x8000. Now it works in both vaniulla an d RT kernel. We should really add some sanity check on CONFIG_TASK_SIZE vs KERNEL_START. Something like this? Wording sould probablyy be a bit different/cleare. diff --git a/include/asm-powerpc/processor.h b/include/asm-powerpc/processor.h index fd98ca9..72e0e3f 100644 --- a/include/asm-powerpc/processor.h +++ b/include/asm-powerpc/processor.h @@ -81,6 +81,10 @@ extern struct task_struct *last_task_used_altivec; extern struct task_struct *last_task_used_spe; #ifdef CONFIG_PPC32 + +#if CONFIG_TASK_SIZE > CONFIG_KERNEL_START +#error User TASK_SIZE overlaps with KERNEL_START address +#endif #define TASK_SIZE (CONFIG_TASK_SIZE) /* This decides where the kernel will search for a free chunk of vm something like that would be good. is there really anything PPC32 specific about it? - k ___ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
Re: 1 GB lowmem
On Wed, 2008-05-21 at 13:00 -0500, Rune Torgersen wrote: > Hi > > I am trying to enable 1 GB of lowmem on a Freescale 8280. > In arch/ppc this was easilly done by: > CONFIG_ADVANCED_OPTIONS=y > CONFIG_HIGHMEM_START=0xfe00 > CONFIG_LOWMEM_SIZE_BOOL=y > CONFIG_LOWMEM_SIZE=0x4000 > CONFIG_KERNEL_START_BOOL=y > CONFIG_KERNEL_START=0xa000 > > This does not work in arch/powerpc. CPU hangs as soon as init starts. > Any ideas what to look at, what to change? You probably need to lower TASK_SIZE too. > The reason I want to do this is because I cannot get highmem support to > work when using CONFIG_PREEMPT_RT. > (hitting a bug_on in kmap_atomic) We should look into fixing that :-) Ben. ___ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
RE: 1 GB lowmem
Kumar Gala wrote: > On May 21, 2008, at 3:55 PM, Rune Torgersen wrote: >> Argh... Found it. Had to set CONFIG_TASK_SIZE to 0x8000. Now it >> works in both vaniulla an d RT kernel. > > We should really add some sanity check on CONFIG_TASK_SIZE vs > KERNEL_START. Something like this? Wording sould probablyy be a bit different/cleare. diff --git a/include/asm-powerpc/processor.h b/include/asm-powerpc/processor.h index fd98ca9..72e0e3f 100644 --- a/include/asm-powerpc/processor.h +++ b/include/asm-powerpc/processor.h @@ -81,6 +81,10 @@ extern struct task_struct *last_task_used_altivec; extern struct task_struct *last_task_used_spe; #ifdef CONFIG_PPC32 + +#if CONFIG_TASK_SIZE > CONFIG_KERNEL_START +#error User TASK_SIZE overlaps with KERNEL_START address +#endif #define TASK_SIZE (CONFIG_TASK_SIZE) /* This decides where the kernel will search for a free chunk of vm ___ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
Re: 1 GB lowmem
On May 21, 2008, at 3:55 PM, Rune Torgersen wrote: Rune Torgersen wrote: [EMAIL PROTECTED] wrote: Hi I am trying to enable 1 GB of lowmem on a Freescale 8280. In arch/ppc this was easilly done by: CONFIG_ADVANCED_OPTIONS=y CONFIG_HIGHMEM_START=0xfe00 CONFIG_LOWMEM_SIZE_BOOL=y CONFIG_LOWMEM_SIZE=0x4000 CONFIG_KERNEL_START_BOOL=y CONFIG_KERNEL_START=0xa000 This does not work in arch/powerpc. CPU hangs as soon as init starts. Any ideas what to look at, what to change? The reason I want to do this is because I cannot get highmem support to work when using CONFIG_PREEMPT_RT. (hitting a bug_on in kmap_atomic) Scratch that. 1 GB lowmem works with vanilla 2.6.25.4, but not at all with 2.6.25.4-rt[13] Argh... Found it. Had to set CONFIG_TASK_SIZE to 0x8000. Now it works in both vaniulla an d RT kernel. We should really add some sanity check on CONFIG_TASK_SIZE vs KERNEL_START. - k ___ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
RE: 1 GB lowmem
Rune Torgersen wrote: > [EMAIL PROTECTED] wrote: >> Hi >> >> I am trying to enable 1 GB of lowmem on a Freescale 8280. >> In arch/ppc this was easilly done by: >> CONFIG_ADVANCED_OPTIONS=y >> CONFIG_HIGHMEM_START=0xfe00 >> CONFIG_LOWMEM_SIZE_BOOL=y >> CONFIG_LOWMEM_SIZE=0x4000 >> CONFIG_KERNEL_START_BOOL=y >> CONFIG_KERNEL_START=0xa000 >> >> This does not work in arch/powerpc. CPU hangs as soon as init starts. >> Any ideas what to look at, what to change? >> >> The reason I want to do this is because I cannot get highmem support >> to work when using CONFIG_PREEMPT_RT. >> (hitting a bug_on in kmap_atomic) > > Scratch that. 1 GB lowmem works with vanilla 2.6.25.4, but > not at all with 2.6.25.4-rt[13] Argh... Found it. Had to set CONFIG_TASK_SIZE to 0x8000. Now it works in both vaniulla an d RT kernel. Highmem still doesn't work. ___ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
RE: 1 GB lowmem
[EMAIL PROTECTED] wrote: > Hi > > I am trying to enable 1 GB of lowmem on a Freescale 8280. > In arch/ppc this was easilly done by: > CONFIG_ADVANCED_OPTIONS=y > CONFIG_HIGHMEM_START=0xfe00 > CONFIG_LOWMEM_SIZE_BOOL=y > CONFIG_LOWMEM_SIZE=0x4000 > CONFIG_KERNEL_START_BOOL=y > CONFIG_KERNEL_START=0xa000 > > This does not work in arch/powerpc. CPU hangs as soon as init starts. > Any ideas what to look at, what to change? > > The reason I want to do this is because I cannot get highmem > support to > work when using CONFIG_PREEMPT_RT. > (hitting a bug_on in kmap_atomic) Scratch that. 1 GB lowmem works with vanilla 2.6.25.4, but not at all with 2.6.25.4-rt[13] ___ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
1 GB lowmem
Hi I am trying to enable 1 GB of lowmem on a Freescale 8280. In arch/ppc this was easilly done by: CONFIG_ADVANCED_OPTIONS=y CONFIG_HIGHMEM_START=0xfe00 CONFIG_LOWMEM_SIZE_BOOL=y CONFIG_LOWMEM_SIZE=0x4000 CONFIG_KERNEL_START_BOOL=y CONFIG_KERNEL_START=0xa000 This does not work in arch/powerpc. CPU hangs as soon as init starts. Any ideas what to look at, what to change? The reason I want to do this is because I cannot get highmem support to work when using CONFIG_PREEMPT_RT. (hitting a bug_on in kmap_atomic) ___ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
