Package: release.debian.org
Severity: normal
User: release.debian@packages.debian.org
Usertags: unblock
Please unblock package zfs-linux
Following
https://www.debian.org/doc/manuals/developers-reference/ch05.en.html#t-p-u
I've not uploaded it yet but asking for permission first.
(explain the reason for the unblock here)
Fix a GRAVE stable RC due to linux's unexporting several
fpu-related symbols:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=929929
This is the very only purpose of this upload.
The solution in this upload is cherry-picked from upstream,
which directly disable the SIMD thing for linux (>= 4.19.38).
I scanned the rest historical patches we have applied to
zfs 0.7.12. Some of them fix crashes and segfaults but they
don't look fatal enough and would inflate the debdiff hence
incur rejection. Let's forget them.
I've tested this patch on Buster with a manually-built
4.19.48 kernel (make defconfig, make, make bindeb-pkg).
Full source:
https://people.debian.org/~lumin/upload/zfs-linux_0.7.12-2+deb10u1_source.changes
Debdiff: attached.
(include/attach the debdiff against the package in testing)
unblock zfs-linux/0.7.12-2+deb10u1
diff --git a/debian/changelog b/debian/changelog
index 41d4a9fe..e6aad323 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+zfs-linux (0.7.12-2+deb10u1) testing-proposed-updates; urgency=high
+
+ * Patch: Disable SIMD on 4.19.37+ or 5.0+ kernels. (Closes: #929929)
+
+ -- Mo Zhou Sun, 09 Jun 2019 03:17:40 +
+
zfs-linux (0.7.12-2) unstable; urgency=medium
[ Colin Ian King ]
diff --git a/debian/patches/e22bfd814960295029ca41c8e116e8d516d3e730.patch b/debian/patches/e22bfd814960295029ca41c8e116e8d516d3e730.patch
new file mode 100644
index ..ceb02ca2
--- /dev/null
+++ b/debian/patches/e22bfd814960295029ca41c8e116e8d516d3e730.patch
@@ -0,0 +1,404 @@
+From e22bfd814960295029ca41c8e116e8d516d3e730 Mon Sep 17 00:00:00 2001
+From: Tony Hutter
+Date: Fri, 11 Jan 2019 18:01:28 -0800
+Subject: [PATCH] Linux 5.0 compat: Disable vector instructions on 5.0+ kernels
+
+The 5.0 kernel no longer exports the functions we need to do vector
+(SSE/SSE2/SSE3/AVX...) instructions. Disable vector-based checksum
+algorithms when building against those kernels.
+
+Reviewed-by: Brian Behlendorf
+Signed-off-by: Tony Hutter
+Closes #8259
+---
+ config/kernel-fpu.m4 | 41 ++---
+ include/linux/simd_x86.h | 127 +++
+ 2 files changed, 134 insertions(+), 34 deletions(-)
+
+diff --git a/config/kernel-fpu.m4 b/config/kernel-fpu.m4
+index 1c5690969d4..671fe7ea54e 100644
+--- a/config/kernel-fpu.m4
b/config/kernel-fpu.m4
+@@ -1,18 +1,41 @@
++dnl #
++dnl # Handle differences in kernel FPU code.
+ dnl #
+-dnl # 4.2 API change
+-dnl # asm/i387.h is replaced by asm/fpu/api.h
++dnl # Kernel
++dnl # 5.0: All kernel fpu functions are GPL only, so we can't use them.
++dnl # (nothing defined)
++dnl #
++dnl # 4.2: Use __kernel_fpu_{begin,end}()
++dnl # HAVE_UNDERSCORE_KERNEL_FPU & KERNEL_EXPORTS_X86_FPU
++dnl #
++dnl # Pre-4.2: Use kernel_fpu_{begin,end}()
++dnl # HAVE_KERNEL_FPU & KERNEL_EXPORTS_X86_FPU
+ dnl #
+ AC_DEFUN([ZFS_AC_KERNEL_FPU], [
+- AC_MSG_CHECKING([whether asm/fpu/api.h exists])
++ AC_MSG_CHECKING([which kernel_fpu function to use])
+ ZFS_LINUX_TRY_COMPILE([
+- #include
+- #include
++ #include
++ #include
+ ],[
+- __kernel_fpu_begin();
++ kernel_fpu_begin();
++ kernel_fpu_end();
+ ],[
+- AC_MSG_RESULT(yes)
+- AC_DEFINE(HAVE_FPU_API_H, 1, [kernel has interface])
++ AC_MSG_RESULT(kernel_fpu_*)
++ AC_DEFINE(HAVE_KERNEL_FPU, 1, [kernel has kernel_fpu_* functions])
++ AC_DEFINE(KERNEL_EXPORTS_X86_FPU, 1, [kernel exports FPU functions])
+ ],[
+- AC_MSG_RESULT(no)
++ ZFS_LINUX_TRY_COMPILE([
++ #include
++ #include
++ ],[
++ __kernel_fpu_begin();
++ __kernel_fpu_end();
++ ],[
++ AC_MSG_RESULT(__kernel_fpu_*)
++ AC_DEFINE(HAVE_UNDERSCORE_KERNEL_FPU, 1, [kernel has __kernel_fpu_* functions])
++ AC_DEFINE(KERNEL_EXPORTS_X86_FPU, 1, [kernel exports FPU functions])
++ ],[
++ AC_MSG_RESULT(not exported)
++ ])
+ ])
+ ])
+diff --git a/include/linux/simd_x86.h b/include/linux/simd_x86.h
+index c9e3970c0cf..c55cb177893 100644
+--- a/include/linux/simd_x86.h
b/include/linux/simd_x86.h
+@@ -81,7 +81,7 @@
+ #endif
+
+ #if defined(_KERNEL)
+-#if defined(HAVE_FPU_API_H)
++#if defined(HAVE_UNDERSCORE_KERNEL_FPU)
+ #include
+ #include
+ #define kfpu_begin() \
+@@ -94,12 +94,18 @@
+ __kernel_fpu_end(); \
+ preempt_enable(); \
+ }
+-#else
++#elif defined(HAVE_KERNEL_FPU)
+ #include
+ #include
+ #define kfpu_begin() kernel_fpu_begin()
+ #define kfpu_end() kernel_fpu_end()
+-#endif /* defined(HAVE_FPU_API_H) */
++#else
++/* Kernel doesn't export any kernel_fpu_* functions */
++#include /* For kernel xgetbv() */
++#define kfpu_begin() panic("This code should never run")
++#define kfpu_end() panic("This code should never run")
++#endif /*
