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| author | Enrico Scholz <enrico.scholz@sigma-chemnitz.de> | 2015-09-17 12:45:11 +0200 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2015-09-21 08:11:35 +0200 |
| commit | 29986f9ff4f9001a500550e9bde9d15c57de21d3 (patch) | |
| tree | 724d9bff2d16fa0e888a412e41c5ec9591b355f2 /arch/arm/cpu | |
| parent | 485ef5279e3ebbf5f9bbc5bc36a1444c6c5db25f (diff) | |
| download | barebox-29986f9ff4f9001a500550e9bde9d15c57de21d3.tar.gz barebox-29986f9ff4f9001a500550e9bde9d15c57de21d3.tar.xz | |
ARM: MMU: fixed calculation of number of PTEs
barebox uses 4KiB pages so that number of PTEs is 'size >> 12', not
'size >> 10'.
Thie 'size >> 10' limit is not an immediate problem because it allocates
too much PTEs only which are not used. But it can overflow an integer
multiplication ('i * PAGE_SIZE') which causes undefined behaviour with
gcc5.
Signed-off-by: Enrico Scholz <enrico.scholz@sigma-chemnitz.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'arch/arm/cpu')
| -rw-r--r-- | arch/arm/cpu/mmu.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/cpu/mmu.c b/arch/arm/cpu/mmu.c index 3a4a17c7dd..470b448957 100644 --- a/arch/arm/cpu/mmu.c +++ b/arch/arm/cpu/mmu.c @@ -215,7 +215,7 @@ static int arm_mmu_remap_sdram(struct memory_bank *bank) unsigned long phys = (unsigned long)bank->start; unsigned long ttb_start = phys >> 20; unsigned long ttb_end = (phys >> 20) + (bank->size >> 20); - unsigned long num_ptes = bank->size >> 10; + unsigned long num_ptes = bank->size >> 12; int i, pte; u32 *ptes; |