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| author | Stefan Kristiansson <stefan.kristiansson@saunalahti.fi> | 2014-01-11 02:17:38 +0400 |
|---|---|---|
| committer | Stafford Horne <shorne@gmail.com> | 2016-12-12 17:09:06 +0300 |
| commit | f47706099bdb8c0e6300d6f5ba8e542861aa3ac5 (patch) | |
| tree | 8c82c1c5e5b26690231eb1e48627403590825fbc /arch/openrisc | |
| parent | 69973b830859bc6529a7a0468ba0d80ee5117826 (diff) | |
| download | linux-f47706099bdb8c0e6300d6f5ba8e542861aa3ac5.tar.xz | |
openrisc: fix PTRS_PER_PGD define
On OpenRISC, with its 8k pages, PAGE_SHIFT is defined to be 13.
That makes the expression (1UL << (PAGE_SHIFT-2)) evaluate
to 2048.
The correct value for PTRS_PER_PGD should be 256.
Correcting the PTRS_PER_PGD define unveiled a bug in map_ram(),
where PTRS_PER_PGD was used when the intent was to iterate
over a set of page table entries.
This patch corrects that issue as well.
Signed-off-by: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Acked-by: Jonas Bonn <jonas@southpole.se>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Stafford Horne <shorne@gmail.com>
Diffstat (limited to 'arch/openrisc')
| -rw-r--r-- | arch/openrisc/include/asm/pgtable.h | 2 | ||||
| -rw-r--r-- | arch/openrisc/mm/init.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/arch/openrisc/include/asm/pgtable.h b/arch/openrisc/include/asm/pgtable.h index 69c7df0e1420..3567aa7be555 100644 --- a/arch/openrisc/include/asm/pgtable.h +++ b/arch/openrisc/include/asm/pgtable.h @@ -69,7 +69,7 @@ extern void paging_init(void); */ #define PTRS_PER_PTE (1UL << (PAGE_SHIFT-2)) -#define PTRS_PER_PGD (1UL << (PAGE_SHIFT-2)) +#define PTRS_PER_PGD (1UL << (32-PGDIR_SHIFT)) /* calculate how many PGD entries a user-level program can use * the first mappable virtual address is 0 diff --git a/arch/openrisc/mm/init.c b/arch/openrisc/mm/init.c index 7f94652311d7..b782ce9ccad9 100644 --- a/arch/openrisc/mm/init.c +++ b/arch/openrisc/mm/init.c @@ -110,7 +110,7 @@ static void __init map_ram(void) set_pmd(pme, __pmd(_KERNPG_TABLE + __pa(pte))); /* Fill the newly allocated page with PTE'S */ - for (j = 0; p < e && j < PTRS_PER_PGD; + for (j = 0; p < e && j < PTRS_PER_PTE; v += PAGE_SIZE, p += PAGE_SIZE, j++, pte++) { if (v >= (u32) _e_kernel_ro || v < (u32) _s_kernel_ro) |