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[PATCH 2/4] m68k/mm: m54xx - Add missing initialization of max_pfn

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  [PATCH 2/4] m68k/mm: m54xx - Add missing initialization of max_pfn Geert Uytterhoeven <geert@linux-m68k.org> - 2015-11-15 12:50 +0100
    Re: [PATCH 2/4] m68k/mm: m54xx - Add missing initialization of  max_pfn Greg Ungerer <gerg@uclinux.org> - 2015-11-17 01:20 +0100

#1269683 — [PATCH 2/4] m68k/mm: m54xx - Add missing initialization of max_pfn

If max_pfn is not initialized, the various /proc/kpage* files are empty,
and selftests/vm/mlock2-tests will fail. max_pfn is also used by the
block layer to calculate DMA masks.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
---
Compile-tested only.
---
 arch/m68k/coldfire/m54xx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/m68k/coldfire/m54xx.c b/arch/m68k/coldfire/m54xx.c
index f7836c6a6b60eb24..c32f76791f488ae1 100644
--- a/arch/m68k/coldfire/m54xx.c
+++ b/arch/m68k/coldfire/m54xx.c
@@ -98,7 +98,7 @@ static void __init mcf54xx_bootmem_alloc(void)
 	memstart = PAGE_ALIGN(_ramstart);
 	min_low_pfn = PFN_DOWN(_rambase);
 	start_pfn = PFN_DOWN(memstart);
-	max_low_pfn = PFN_DOWN(_ramend);
+	max_pfn = max_low_pfn = PFN_DOWN(_ramend);
 	high_memory = (void *)_ramend;
 
 	m68k_virt_to_node_shift = fls(_ramend - _rambase - 1) - 6;
-- 
1.9.1

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#1270713 — Re: [PATCH 2/4] m68k/mm: m54xx - Add missing initialization of max_pfn

Hi Geert,

On 15/11/15 21:04, Geert Uytterhoeven wrote:
> If max_pfn is not initialized, the various /proc/kpage* files are empty,
> and selftests/vm/mlock2-tests will fail. max_pfn is also used by the
> block layer to calculate DMA masks.
> 
> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
> ---
> Compile-tested only.

Tested and seems to work fine on MMU ColdFire (I didn't check
the actual entries for accuracy - but /proc/kpageflags and
/proc/kpagecount look to be reporting correctly now).

Tested-by: Greg Ungerer <gerg@uclinux.org>

Regards
Greg






























> ---
>  arch/m68k/coldfire/m54xx.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/m68k/coldfire/m54xx.c b/arch/m68k/coldfire/m54xx.c
> index f7836c6a6b60eb24..c32f76791f488ae1 100644
> --- a/arch/m68k/coldfire/m54xx.c
> +++ b/arch/m68k/coldfire/m54xx.c
> @@ -98,7 +98,7 @@ static void __init mcf54xx_bootmem_alloc(void)
>  	memstart = PAGE_ALIGN(_ramstart);
>  	min_low_pfn = PFN_DOWN(_rambase);
>  	start_pfn = PFN_DOWN(memstart);
> -	max_low_pfn = PFN_DOWN(_ramend);
> +	max_pfn = max_low_pfn = PFN_DOWN(_ramend);
>  	high_memory = (void *)_ramend;
>  
>  	m68k_virt_to_node_shift = fls(_ramend - _rambase - 1) - 6;
> 

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