diff options
| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2016-02-26 17:57:14 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2016-02-29 18:31:03 +0000 |
| commit | 020d044f66874eba058ce8264fc550f3eca67879 (patch) | |
| tree | 77456326c82899b4ef57593788b0bebf02f00ed0 /arch/arm64/include/asm/memory.h | |
| parent | a6e1f7273b709328ed19e1b8ca5ae61dc1d9b4c0 (diff) | |
arm64: mm: treat memstart_addr as a signed quantity
Commit c031a4213c11 ("arm64: kaslr: randomize the linear region")
implements randomization of the linear region, by subtracting a random
multiple of PUD_SIZE from memstart_addr. This causes the virtual mapping
of system RAM to move upwards in the linear region, and at the same time
causes memstart_addr to assume a value which may be negative if the offset
of system RAM in the physical space is smaller than its offset relative to
PAGE_OFFSET in the virtual space.
Since memstart_addr is effectively an offset now, redefine its type as s64
so that expressions involving shifting or division preserve its sign.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/memory.h')
| -rw-r--r-- | arch/arm64/include/asm/memory.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h index 5f8667a99e41..12f8a00fb3f1 100644 --- a/arch/arm64/include/asm/memory.h +++ b/arch/arm64/include/asm/memory.h @@ -135,7 +135,7 @@ #include <linux/bitops.h> #include <linux/mmdebug.h> -extern phys_addr_t memstart_addr; +extern s64 memstart_addr; /* PHYS_OFFSET - the physical address of the start of memory. */ #define PHYS_OFFSET ({ VM_BUG_ON(memstart_addr & 1); memstart_addr; }) |