c/zfsonlinux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

[SIMD]: FPU register save/restore is also required on 5.0 kernels~

Browse Source 
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
Acked-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
This commit is contained in:
Thomas Lamprecht 2019-09-27 12:00:03 +02:00
parent 9cad433df9
commit 457c4458a2
2 changed files with 58 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

57
debian/patches/0010-SIMD-FPU-register-save-restore-is-also-required-on-5.patch vendored Normal file
View File

@ -0,0 +1,57 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Thomas Lamprecht <t.lamprecht@proxmox.com>
Date: Wed, 25 Sep 2019 10:48:48 +0200
Subject: [PATCH] [SIMD]: FPU register save/restore is also required on 5.0
kernels
NOTE: the kernel needs to have the copy_kernel_to_xregs_err,
copy_kernel_to_fxregs_err and copy_kernel_to_fregs_err funcitons
backported for this to work.
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
---
include/linux/simd_x86.h | 11 +----------
1 file changed, 1 insertion(+), 10 deletions(-)
diff --git a/include/linux/simd_x86.h b/include/linux/simd_x86.h
index 5f243e0cc..aac63d964 100644
--- a/include/linux/simd_x86.h
+++ b/include/linux/simd_x86.h
@@ -179,7 +179,6 @@ kfpu_begin(void)
preempt_disable();
local_irq_disable();
-#if defined(HAVE_KERNEL_TIF_NEED_FPU_LOAD)
/*
* The current FPU registers need to be preserved by kfpu_begin()
* and restored by kfpu_end(). This is required because we can
@@ -188,20 +187,13 @@ kfpu_begin(void)
* context switch.
*/
copy_fpregs_to_fpstate(&current->thread.fpu);
-#elif defined(HAVE_KERNEL_FPU_INITIALIZED)
- /*
- * There is no need to preserve and restore the FPU registers.
- * They will always be restored from the task's stored FPU state
- * when switching contexts.
- */
+
WARN_ON_ONCE(current->thread.fpu.initialized == 0);
-#endif
}
static inline void
kfpu_end(void)
{
-#if defined(HAVE_KERNEL_TIF_NEED_FPU_LOAD)
union fpregs_state *state = &current->thread.fpu.state;
int error;
@@ -213,7 +205,6 @@ kfpu_end(void)
error = copy_kernel_to_fregs_err(&state->fsave);
}
WARN_ON_ONCE(error);
-#endif
local_irq_enable();
preempt_enable();

1
debian/patches/series vendored
View File

@ -7,3 +7,4 @@
0007-Fix-race-in-parallel-mount-s-thread-dispatching-algo.patch
0008-Linux-5.0-compat-SIMD-compatibility.patch
0009-Fix-CONFIG_X86_DEBUG_FPU-build-failure.patch
0010-SIMD-FPU-register-save-restore-is-also-required-on-5.patch