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authorJean-Philippe Brucker <jean-philippe.brucker@arm.com>2019-04-08 19:17:18 +0200
committerWill Deacon <will.deacon@arm.com>2019-04-09 13:38:31 +0200
commit6fda41bf12615ee7c3ddac88155099b1a8cf8d00 (patch)
tree691c94a935b7bf3659e6ff4158ecd8d4a43731d6 /arch/arm64/kernel/debug-monitors.c
parentarm64: mm: Consolidate early page table allocation (diff)
downloadlinux-6fda41bf12615ee7c3ddac88155099b1a8cf8d00.tar.xz
linux-6fda41bf12615ee7c3ddac88155099b1a8cf8d00.zip
arm64: Clear OSDLR_EL1 on CPU boot
Some firmwares may reboot CPUs with OS Double Lock set. Make sure that it is unlocked, in order to use debug exceptions. Cc: <stable@vger.kernel.org> Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/kernel/debug-monitors.c')
-rw-r--r--arch/arm64/kernel/debug-monitors.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/kernel/debug-monitors.c b/arch/arm64/kernel/debug-monitors.c
index 800486cc4823..555b6bd2f3d6 100644
--- a/arch/arm64/kernel/debug-monitors.c
+++ b/arch/arm64/kernel/debug-monitors.c
@@ -135,6 +135,7 @@ NOKPROBE_SYMBOL(disable_debug_monitors);
*/
static int clear_os_lock(unsigned int cpu)
{
+ write_sysreg(0, osdlr_el1);
write_sysreg(0, oslar_el1);
isb();
return 0;