1 files changed, 0 insertions, 79 deletions
diff --git a/debian/patches-rt/0025-x86-fpu-Add-a-fastpath-to-copy_fpstate_to_sigframe.patch b/debian/patches-rt/0025-x86-fpu-Add-a-fastpath-to-copy_fpstate_to_sigframe.patch
deleted file mode 100644
index 3d4f1df09..000000000
--- a/debian/patches-rt/0025-x86-fpu-Add-a-fastpath-to-copy_fpstate_to_sigframe.patch
+++ /dev/null
@@ -1,79 +0,0 @@
-From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
-Date: Wed, 3 Apr 2019 15:59:12 +0200
-Subject: [PATCH 25/27] x86/fpu: Add a fastpath to copy_fpstate_to_sigframe()
-Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.0/older/patches-5.0.10-rt7.tar.xz
-
-If the CPU holds the FPU register for the current task then we can try to save
-them directly to the userland stack frame. This has to be done with the
-pagefault disabled because we can't fault (while the FPU registers are locked)
-and therefore the operation might fail.
-If it fails try the slowpath which can handle faults.
-
-Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
----
- arch/x86/kernel/fpu/signal.c |   34 ++++++++++++++++++++++------------
- 1 file changed, 22 insertions(+), 12 deletions(-)
-
---- a/arch/x86/kernel/fpu/signal.c
-+++ b/arch/x86/kernel/fpu/signal.c
-@@ -144,8 +144,10 @@ static inline int copy_fpregs_to_sigfram
-  *	buf == buf_fx for 64-bit frames and 32-bit fsave frame.
-  *	buf != buf_fx for 32-bit frames with fxstate.
-  *
-- * Save the state to task's fpu->state and then copy it to the user frame
-- * pointed by the aligned pointer 'buf_fx'.
-+ * Try to save it directly to the user frame with disabled page fault handler.
-+ * If this fails then do the slow path where the FPU state is first saved to
-+ * task's fpu->state and then copy it to the user frame pointed by the aligned
-+ * pointer 'buf_fx'.
-  *
-  * If this is a 32-bit frame with fxstate, put a fsave header before
-  * the aligned state at 'buf_fx'.
-@@ -159,6 +161,7 @@ int copy_fpstate_to_sigframe(void __user
- 	struct xregs_state *xsave = &fpu->state.xsave;
- 	struct task_struct *tsk = current;
- 	int ia32_fxstate = (buf != buf_fx);
-+	int ret = -EFAULT;
- 
- 	ia32_fxstate &= (IS_ENABLED(CONFIG_X86_32) ||
- 			 IS_ENABLED(CONFIG_IA32_EMULATION));
-@@ -174,22 +177,29 @@ int copy_fpstate_to_sigframe(void __user
- 	fpregs_lock();
- 	/*
- 	 * If we do not need to load the FPU registers at return to userspace
--	 * then the CPU has the current state and we need to save it. Otherwise
--	 * it is already done and we can skip it.
-+	 * then the CPU has the current state. Try to save it directly to
-+	 * userland's stack frame if it does not cause a pagefault. If it does,
-+	 * try the slowpath.
- 	 */
- 	if (!test_thread_flag(TIF_NEED_FPU_LOAD)) {
--		copy_fpregs_to_fpstate(fpu);
-+		pagefault_disable();
-+		ret = copy_fpregs_to_sigframe(buf_fx);
-+		pagefault_enable();
-+		if (ret)
-+			copy_fpregs_to_fpstate(fpu);
- 		set_thread_flag(TIF_NEED_FPU_LOAD);
- 	}
- 	fpregs_unlock();
- 
--	if (using_compacted_format()) {
--		if (copy_xstate_to_user(buf_fx, xsave, 0, size))
--			return -1;
--	} else {
--		fpstate_sanitize_xstate(fpu);
--		if (__copy_to_user(buf_fx, xsave, fpu_user_xstate_size))
--			return -1;
-+	if (ret) {
-+		if (using_compacted_format()) {
-+			if (copy_xstate_to_user(buf_fx, xsave, 0, size))
-+				return -1;
-+		} else {
-+			fpstate_sanitize_xstate(fpu);
-+			if (__copy_to_user(buf_fx, xsave, fpu_user_xstate_size))
-+				return -1;
-+		}
- 	}
- 
- 	/* Save the fsave header for the 32-bit frames. */