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powerpc/fsl-booke: Fix settlbcam for 64-bit

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Currently, it does a cntlzd on the size and then subtracts it from
21.... this doesn't take into account the varying size of a "long".
Just use __ilog instead (and subtract the 10 we have to subtract
to get to the tsize encoding).

Also correct the comment about page sizes supported.

Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Becky Bruce 2011-10-12 16:17:02 -05:00 committed by Kumar Gala
parent b9df022319
commit 4559424a0c
1 changed files with 6 additions and 6 deletions
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12
arch/powerpc/mm/fsl_booke_mmu.c
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@ -101,17 +101,17 @@ unsigned long p_mapped_by_tlbcam(phys_addr_t pa)
/*
* Set up a variable-size TLB entry (tlbcam). The parameters are not checked;
* in particular size must be a power of 4 between 4k and 256M (or 1G, for cpus
* that support extended page sizes). Note that while some cpus support a
* page size of 4G, we don't allow its use here.
* in particular size must be a power of 4 between 4k and the max supported by
* an implementation; max may further be limited by what can be represented in
* an unsigned long (for example, 32-bit implementations cannot support a 4GB
* size).
*/
static void settlbcam(int index, unsigned long virt, phys_addr_t phys,
unsigned long size, unsigned long flags, unsigned int pid)
{
unsigned int tsize, lz;
unsigned int tsize;
asm (PPC_CNTLZL "%0,%1" : "=r" (lz) : "r" (size));
tsize = 21 - lz;
tsize = __ilog2(size) - 10;
#ifdef CONFIG_SMP
if ((flags & _PAGE_NO_CACHE) == 0)