linux-kernel - Re: [PATCH v4 04/16] powerpc/mm/32s: use generic mmu_mapin

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Date:   Thu, 21 Feb 2019 19:02:45 +0000
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>, j.neuschaefer@....net
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v4 04/16] powerpc/mm/32s: use generic mmu_mapin_ram() for
 all blocks.



On 02/21/2019 01:51 PM, Michael Ellerman wrote:
> Christophe Leroy <christophe.leroy@....fr> writes:
> 
>> Now that mmu_mapin_ram() is able to handle other blocks
>> than the one starting at 0, the WII can use it for all
>> its blocks.
>>
>> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
>> ---
>>   arch/powerpc/mm/pgtable_32.c | 27 +++++++++------------------
>>   1 file changed, 9 insertions(+), 18 deletions(-)
>>
>> diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
>> index b4858818523f..2bf9bf8867d4 100644
>> --- a/arch/powerpc/mm/pgtable_32.c
>> +++ b/arch/powerpc/mm/pgtable_32.c
>> @@ -254,26 +254,17 @@ static void __init __mapin_ram_chunk(unsigned long offset, unsigned long top)
>>   
>>   void __init mapin_ram(void)
>>   {
>> -	unsigned long s, top;
>> -
>> -#ifndef CONFIG_WII
>> -	top = total_lowmem;
>> -	s = mmu_mapin_ram(0, top);
>> -	__mapin_ram_chunk(s, top);
>> -#else
>> -	if (!wii_hole_size) {
>> -		s = mmu_mapin_ram(0, total_lowmem);
>> -		__mapin_ram_chunk(s, total_lowmem);
>> -	} else {
>> -		top = wii_hole_start;
>> -		s = mmu_mapin_ram(0, top);
>> -		__mapin_ram_chunk(s, top);
>> +	struct memblock_region *reg;
>> +
>> +	for_each_memblock(memory, reg) {
>> +		unsigned long base = reg->base;
>> +		unsigned long top = min(base + reg->size, (unsigned long)total_lowmem);
> 
> This gives me:
> 
> In file included from ../arch/powerpc/mm/pgtable_32.c:22:
> ../arch/powerpc/mm/pgtable_32.c: In function ‘mapin_ram’:
> ../include/linux/kernel.h:846:29: error: comparison of distinct pointer types lacks a cast [-Werror]
>     (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
>                               ^~
> ../include/linux/kernel.h:860:4: note: in expansion of macro ‘__typecheck’
>     (__typecheck(x, y) && __no_side_effects(x, y))
>      ^~~~~~~~~~~
> ../include/linux/kernel.h:870:24: note: in expansion of macro ‘__safe_cmp’
>    __builtin_choose_expr(__safe_cmp(x, y), \
>                          ^~~~~~~~~~
> ../include/linux/kernel.h:879:19: note: in expansion of macro ‘__careful_cmp’
>   #define min(x, y) __careful_cmp(x, y, <)
>                     ^~~~~~~~~~~~~
> ../arch/powerpc/mm/pgtable_32.c:261:23: note: in expansion of macro ‘min’
>     unsigned long top = min(base + reg->size, (unsigned long)total_lowmem);
>                         ^~~
> cc1: all warnings being treated as errors
> ../scripts/Makefile.build:276: recipe for target 'arch/powerpc/mm/pgtable_32.o' failed
> 
> 
> For 44x/bamboo_defconfig.
> 

The patch below should make it. Tested it on half a dozen of config.

diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index 2bf9bf8867d4..c4b0eb51f6d8 100644
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c
@@ -257,8 +257,8 @@ void __init mapin_ram(void)
  	struct memblock_region *reg;

  	for_each_memblock(memory, reg) {
-		unsigned long base = reg->base;
-		unsigned long top = min(base + reg->size, (unsigned long)total_lowmem);
+		phys_addr_t base = reg->base;
+		phys_addr_t top = min(base + reg->size, total_lowmem);

  		if (base >= top)
  			continue;

I'll send out v5, hope it'll be the last one :(

Christophe