Hi,
WARNING: Linux MM newbie here. Please bare with me a bit.
While debugging a new v4l2 driver that makes use of the OMAP4 Tiler allocators
in mmap calls, I found out that
remap_pfn_range was getting completely stalled.
And while debugging further, i realized that the point of stall was in
mm/memory.c, function:
static int remap_pte_range(struct mm_struct *mm, pmd_t *pmd,
unsigned long addr, unsigned long end,
unsigned long pfn, pgprot_t prot)
{
pte_t *pte;
spinlock_t *ptl;
pte = pte_alloc_map_lock(mm, pmd, addr, &ptl);
if (!pte)
return -ENOMEM;
arch_enter_lazy_mmu_mode();
do {
BUG_ON(!pte_none(*pte)); <---******* HERE
set_pte_at(mm, addr, pte, pte_mkspecial(pfn_pte(pfn, prot)));
pfn++;
} while (pte++, addr += PAGE_SIZE, addr != end);
arch_leave_lazy_mmu_mode();
pte_unmap_unlock(pte - 1, ptl);
return 0;
}
This is in 2.6.35.6 kernel + TI Android kernel changes. [1]
How should i interpret this? Does this mean something specific?
Any pointers will be appreciated.
Regards,
Sergio
---
[1]
http://git.omapzoom.org/?p=kernel/omap.git;a=shortlog;h=refs/heads/p-android-omap-2.6.35--
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