* [PATCH 5/17] Fix DRM to support 4level page tables
@ 2004-10-25 7:23 Andreas Kleen
0 siblings, 0 replies; only message in thread
From: Andreas Kleen @ 2004-10-25 7:23 UTC (permalink / raw)
To: torvalds; +Cc: linux-kernel, akpm
Fix DRM to support 4level page tables
Except for some ppc32 low level drivers DRM was the only code
in drivers that needed changes for 4levels.
Signed-off-by: Andi Kleen <ak@suse.de>
diff -urpN -X ../KDIFX linux-2.6.10rc1/drivers/char/drm/drm_memory.h linux-2.6.10rc1-4level/drivers/char/drm/drm_memory.h
--- linux-2.6.10rc1/drivers/char/drm/drm_memory.h 2004-10-19 01:55:10.000000000 +0200
+++ linux-2.6.10rc1-4level/drivers/char/drm/drm_memory.h 2004-10-25 04:48:10.000000000 +0200
@@ -121,10 +121,12 @@ agp_remap (unsigned long offset, unsigne
return addr;
}
+/* AK: looks racy */
static inline unsigned long
drm_follow_page (void *vaddr)
{
- pgd_t *pgd = pgd_offset_k((unsigned long) vaddr);
+ pml4_t *pml4 = pml4_offset_k((unsigned long) vaddr);
+ pgd_t *pgd = pml4_pgd_offset_k(pml4, (unsigned long) vaddr);
pmd_t *pmd = pmd_offset(pgd, (unsigned long) vaddr);
pte_t *ptep = pte_offset_kernel(pmd, (unsigned long) vaddr);
return pte_pfn(*ptep) << PAGE_SHIFT;
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