[Devel] [PATCH 2/2] allow 32-bit restart of 64-bit and vice versa

[Serge E. Hallyn]

Signed-off-by: Serge E. Hallyn <serue at us.ibm.com>
---
 arch/x86/kernel/checkpoint.c |   21 +++++----------------
 1 files changed, 5 insertions(+), 16 deletions(-)

diff --git a/arch/x86/kernel/checkpoint.c b/arch/x86/kernel/checkpoint.c
index 0b8e2c3..fbe9521 100644
--- a/arch/x86/kernel/checkpoint.c
+++ b/arch/x86/kernel/checkpoint.c
@@ -272,22 +272,11 @@ int restore_thread(struct ckpt_ctx *ctx)
 	load_TLS(thread, cpu);
 	put_cpu();
 
-#if defined(CONFIG_X86_64)
-	{
-		int pre, post;
-		/*
-		 * Eventually we'd like to support mixed-bit restart, but for
-		 * now don't pretend to.
-		 */
-		pre = test_thread_flag(TIF_IA32);
-		post = h->thread_info_flags & _TIF_IA32;
-		if ((pre && !post) || (post && !pre)) {
-			ret = -EINVAL;
-			ckpt_err(ctx, ret, "%d-bit restarting %d-bit\n",
-				pre ? 32 : 64, post ? 32 : 64);
-			goto out;
-		}
-	}
+#if defined(CONFIG_X86_64) && defined(CONFIG_COMPAT)
+	if (h->thread_info_flags & _TIF_IA32)
+		set_thread_flag(TIF_IA32);
+	else
+		clear_thread_flag(TIF_IA32);
 #endif
 
 	/* TODO: restore TIF flags as necessary (e.g. TIF_NOTSC) */
-- 
1.6.0.6

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