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authorCatalin Marinas <catalin.marinas@arm.com>2011-04-06 16:17:17 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-04-10 21:13:37 +0100
commitc98c09773d80db93cae349f0496fef109feab54d (patch)
tree1f453c19ae8f6e3f1f322534d704355dfb32bbdd
parent2e82669acf03e5bf2080f5d3ef005168e67d8a51 (diff)
ARM: 6868/1: Preserve the VFP state during fork
VFP registers d16-d31 are callee saved registers and must be preserved during function calls, including fork(). The VFP configuration should also be preserved. The patch copies the full VFP state to the child process. Reported-by: Paul Wright <paul.wright@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--arch/arm/vfp/vfpmodule.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c
index 1c88bbdfd34..f74695075e6 100644
--- a/arch/arm/vfp/vfpmodule.c
+++ b/arch/arm/vfp/vfpmodule.c
@@ -78,6 +78,14 @@ static void vfp_thread_exit(struct thread_info *thread)
put_cpu();
}
+static void vfp_thread_copy(struct thread_info *thread)
+{
+ struct thread_info *parent = current_thread_info();
+
+ vfp_sync_hwstate(parent);
+ thread->vfpstate = parent->vfpstate;
+}
+
/*
* When this function is called with the following 'cmd's, the following
* is true while this function is being run:
@@ -148,6 +156,10 @@ static int vfp_notifier(struct notifier_block *self, unsigned long cmd, void *v)
case THREAD_NOTIFY_EXIT:
vfp_thread_exit(thread);
break;
+
+ case THREAD_NOTIFY_COPY:
+ vfp_thread_copy(thread);
+ break;
}
return NOTIFY_DONE;