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[v3,04/13] arm64: cpufeature: Pass capability structure to ->enable callback

Message ID 1515432758-26440-5-git-send-email-will.deacon@arm.com
State Accepted
Commit 0a0d111d40fd1dc588cc590fab6b55d86ddc71d3
Headers show
Series arm64 kpti hardening and variant 2 workarounds | expand

Commit Message

Will Deacon Jan. 8, 2018, 5:32 p.m. UTC 
In order to invoke the CPU capability ->matches callback from the ->enable
callback for applying local-CPU workarounds, we need a handle on the
capability structure.

This patch passes a pointer to the capability structure to the ->enable
callback.

Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>

Signed-off-by: Will Deacon <will.deacon@arm.com>

---
 arch/arm64/kernel/cpufeature.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

-- 
2.1.4
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Patch

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index d723fc071f39..55712ab4e3bf 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -1152,7 +1152,7 @@  void __init enable_cpu_capabilities(const struct arm64_cpu_capabilities *caps)
 			 * uses an IPI, giving us a PSTATE that disappears when
 			 * we return.
 			 */
-			stop_machine(caps->enable, NULL, cpu_online_mask);
+			stop_machine(caps->enable, (void *)caps, cpu_online_mask);
 		}
 	}
 }
@@ -1195,7 +1195,7 @@  verify_local_cpu_features(const struct arm64_cpu_capabilities *caps)
 			cpu_die_early();
 		}
 		if (caps->enable)
-			caps->enable(NULL);
+			caps->enable((void *)caps);
 	}
 }