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Commit 725a269b authored by Marcin Nowakowski's avatar Marcin Nowakowski Committed by Ralf Baechle
Browse files

MIPS: highmem: ensure that we don't use more than one page for PTEs 



All PTEs used by PKMAP should be allocated in a contiguous memory area,
but we do not currently have a mechanism to enforce that, so ensure that
we don't try to allocate more entries than would fit in a single page.

Current fixed value of 1024 would not work with XPA enabled when
sizeof(pte_t)==8 and we need two pages to store pte tables.

Signed-off-by: default avatarMarcin Nowakowski <marcin.nowakowski@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/15949/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 71eb989a

arch/mips/include/asm/highmem.h

+5 −0
Original line number Diff line number Diff line
@@ -35,7 +35,12 @@ extern pte_t *pkmap_page_table; 
 * easily, subsequent pte tables have to be allocated in one physical

 * chunk of RAM.

 */

#ifdef CONFIG_PHYS_ADDR_T_64BIT

#define LAST_PKMAP 512

#else

#define LAST_PKMAP 1024

#endif



#define LAST_PKMAP_MASK (LAST_PKMAP-1)

#define PKMAP_NR(virt)	((virt-PKMAP_BASE) >> PAGE_SHIFT)

#define PKMAP_ADDR(nr)	(PKMAP_BASE + ((nr) << PAGE_SHIFT))