On Wed, Jul 30, 2014 at 11:59:02AM +0100, Ard Biesheuvel wrote: > From: Mark Rutland <mark.rutland@xxxxxxx> > > In certain cases the cpu-release-addr of a CPU may not fall in the > linear mapping (e.g. when the kernel is loaded above this address due to > the presence of other images in memory). This is problematic for the > spin-table code as it assumes that it can trivially convert a > cpu-release-addr to a valid VA in the linear map. > > This patch modifies the spin-table code to use a temporary cached > mapping to write to a given cpu-release-addr, enabling us to support > addresses regardless of whether they are covered by the linear mapping. > > Signed-off-by: Mark Rutland <mark.rutland@xxxxxxx> > Tested-by: Mark Salter <msalter@xxxxxxxxxx> > [ardb: added (__force void *) cast] > Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> > --- > arch/arm64/kernel/smp_spin_table.c | 22 +++++++++++++++++----- > 1 file changed, 17 insertions(+), 5 deletions(-) I'm nervous about this. What if the spin table sits in the same physical 64k frame as a read-sensitive device and we're running with 64k pages? Will -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
