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authorCatalin Marinas <catalin.marinas@arm.com>2011-04-06 19:17:17 +0400
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-04-11 00:13:37 +0400
commitc98c09773d80db93cae349f0496fef109feab54d (patch)
tree1f453c19ae8f6e3f1f322534d704355dfb32bbdd /arch/arm/vfp
parent2e82669acf03e5bf2080f5d3ef005168e67d8a51 (diff)
downloadlinux-c98c09773d80db93cae349f0496fef109feab54d.tar.xz
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>
Diffstat (limited to 'arch/arm/vfp')
-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 1c88bbdfd34d..f74695075e64 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;