arm64: Ensure the instruction emulation is ready for userspace

We trap and emulate some instructions (e.g, mrs, deprecated instructions) for the userspace. However the handlers for these are registered as late_initcalls and the userspace could be up and running from the initramfs by that time (with populate_rootfs, which is a rootfs_initcall()). This could cause problems for the early applications ending up in failure like : [ 11.152061] modprobe[93]: undefined instruction: pc=0000ffff8ca48ff4 This patch promotes the specific calls to core_initcalls, which are guaranteed to be completed before we hit userspace. Cc: [email protected] Cc: Dave Martin <[email protected]> Cc: Matthias Brugger <[email protected]> Cc: James Morse <[email protected]> Reported-by: Matwey V. Kornilov <[email protected]> Signed-off-by: Suzuki K Poulose <[email protected]> Signed-off-by: Catalin Marinas <[email protected]>
ambv · Oct 6, 2017 · c0d8832 · c0d8832
1 parent b02faed
commit c0d8832
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Showing 2 changed files with 2 additions and 2 deletions.
diff --git a/arch/arm64/kernel/armv8_deprecated.c b/arch/arm64/kernel/armv8_deprecated.c
@@ -649,4 +649,4 @@ static int __init armv8_deprecated_init(void)
 	return 0;
 }
 
-late_initcall(armv8_deprecated_init);
+core_initcall(armv8_deprecated_init);
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
@@ -1307,4 +1307,4 @@ static int __init enable_mrs_emulation(void)
 	return 0;
 }
 
-late_initcall(enable_mrs_emulation);
+core_initcall(enable_mrs_emulation);