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authorFernando Rodriguez <frodriguez.developer@outlook.com>2015-09-16 18:24:47 -0400
committerIan Delaney <idella4@gentoo.org>2015-09-23 17:21:10 +0800
commit6913a35966d89d28ed6208ab9a58c20fd8a80396 (patch)
tree588b1aed5e88ae8b428d0920b181fe9091dac936 /x11-drivers/ati-drivers
parentdev-vcs/subversion: Removed old. (diff)
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x11-drivers/ati-drivers: Fix compile errors and preemption bug
Ebuild cleanup and patches to compile against recent kernels by replacing calls that use GPL'd kernel symbols with our own implementation and several others to fix compile errors caused by API changes on recent kernels. Also adds patch to disable preemption before calling certain kernel functions that trigger the following error: BUG: using smp_processor_id() in preemptible [00000000] code:firegl/3657 Gentoo-Bug: 548118 Gentoo-Bug: 542320
Diffstat (limited to 'x11-drivers/ati-drivers')
-rw-r--r--x11-drivers/ati-drivers/ati-drivers-15.9.ebuild56
-rw-r--r--x11-drivers/ati-drivers/files/15.9-fpu.patch39
-rw-r--r--x11-drivers/ati-drivers/files/15.9-kcl_str.patch14
-rw-r--r--x11-drivers/ati-drivers/files/15.9-mtrr.patch27
-rw-r--r--x11-drivers/ati-drivers/files/15.9-preempt.patch103
-rw-r--r--x11-drivers/ati-drivers/files/15.9-remove-gpl-symbols.patch74
-rw-r--r--x11-drivers/ati-drivers/files/15.9-sep_printf.patch11
7 files changed, 307 insertions, 17 deletions
diff --git a/x11-drivers/ati-drivers/ati-drivers-15.9.ebuild b/x11-drivers/ati-drivers/ati-drivers-15.9.ebuild
index 0d9075506d4..9bc5788acf9 100644
--- a/x11-drivers/ati-drivers/ati-drivers-15.9.ebuild
+++ b/x11-drivers/ati-drivers/ati-drivers-15.9.ebuild
@@ -13,8 +13,10 @@ RUN="${WORKDIR}/AMD-Catalyst-15.9-Linux-installer-15.201.1151-x86.x86_64.run"
SLOT="1"
# Uses javascript for download YESSSS
#DRIVERS_URI="http://www2.ati.com/drivers/linux/amd-catalyst-13.12-linux-x86.x86_64.zip"
-DRIVERS_URI="mirror://gentoo/amd-catalyst-${PV}-linux-installer-15.201.1151-x86.x86_64.zip"
-XVBA_SDK_URI="http://developer.amd.com/wordpress/media/2012/10/xvba-sdk-0.74-404001.tar.gz"
+DRV_VER="amd-catalyst-${PV}-linux-installer-15.201.1151-x86.x86_64.zip"
+DRIVERS_URI="mirror://gentoo/${DRV_VER}"
+SDK_VER="xvba-sdk-0.74-404001.tar.gz"
+XVBA_SDK_URI="http://developer.amd.com/wordpress/media/2012/10/${SDK_VER}"
SRC_URI="${DRIVERS_URI} ${XVBA_SDK_URI}"
FOLDER_PREFIX="common/"
IUSE="debug +modules qt4 static-libs pax_kernel gdm-hack"
@@ -149,19 +151,21 @@ pkg_nofetch() {
einfo "The driver packages"
einfo ${A}
einfo "need to be downloaded manually from"
- einfo "http://support.amd.com/en-us/download/desktop?os=Linux%20x86_64"
+ einfo "http://support.amd.com/en-us/download/desktop?os=Linux+x86"
einfo "and ${XVBA_SDK_URI}"
}
pkg_pretend() {
- local CONFIG_CHECK="~MTRR ~!DRM ACPI PCI_MSI !LOCKDEP !PAX_KERNEXEC_PLUGIN_METHOD_OR"
+ local CONFIG_CHECK="~MTRR ~!DRM ACPI PCI_MSI \
+ !LOCKDEP !PAX_KERNEXEC_PLUGIN_METHOD_OR"
use amd64 && CONFIG_CHECK+=" COMPAT"
local ERROR_MTRR="CONFIG_MTRR required for direct rendering."
- local ERROR_DRM="CONFIG_DRM must be disabled or compiled as a module and not loaded for direct
- rendering to work."
- local ERROR_LOCKDEP="CONFIG_LOCKDEP (lock tracking) exports the symbol lock_acquire
- as GPL-only. This prevents ${P} from compiling with an error like this:
+ local ERROR_DRM="CONFIG_DRM must be disabled or compiled as a
+ module and not loaded for direct rendering to work."
+ local ERROR_LOCKDEP="CONFIG_LOCKDEP (lock tracking) exports
+ the symbol lock_acquire as GPL-only. This prevents ${P} from
+ compiling with an error like this:
FATAL: modpost: GPL-incompatible module fglrx.ko uses GPL-only symbol 'lock_acquire'"
local ERROR_PAX_KERNEXEC_PLUGIN_METHOD_OR="This config option will cause
kernel to reject loading the fglrx module with
@@ -191,15 +195,18 @@ pkg_pretend() {
pkg_setup() {
if use modules; then
- MODULE_NAMES="fglrx(video:${S}/${FOLDER_PREFIX}/lib/modules/fglrx/build_mod/2.6.x)"
+ MODULE_PATH="${S}/${FOLDER_PREFIX}/lib/modules/fglrx/build_mod/2.6.x"
+ MODULE_NAMES="fglrx(video:${MODULE_PATH})"
BUILD_TARGETS="kmod_build"
linux-mod_pkg_setup
BUILD_PARAMS="GCC_VER_MAJ=$(gcc-major-version) KVER=${KV_FULL} KDIR=${KV_OUT_DIR}"
BUILD_PARAMS="${BUILD_PARAMS} CFLAGS_MODULE+=\"-DMODULE -DATI -DFGL\""
if grep -q arch_compat_alloc_user_space ${KV_DIR}/arch/x86/include/asm/compat.h ; then
- BUILD_PARAMS="${BUILD_PARAMS} CFLAGS_MODULE+=-DCOMPAT_ALLOC_USER_SPACE=arch_compat_alloc_user_space"
+ BUILD_PARAMS="${BUILD_PARAMS} \
+ CFLAGS_MODULE+=-DCOMPAT_ALLOC_USER_SPACE=arch_compat_alloc_user_space"
else
- BUILD_PARAMS="${BUILD_PARAMS} CFLAGS_MODULE+=-DCOMPAT_ALLOC_USER_SPACE=compat_alloc_user_space"
+ BUILD_PARAMS="${BUILD_PARAMS} \
+ CFLAGS_MODULE+=-DCOMPAT_ALLOC_USER_SPACE=compat_alloc_user_space"
fi
fi
# Define module dir.
@@ -310,6 +317,16 @@ src_prepare() {
# Compile fix, #526602
epatch "${FILESDIR}/use-kernel_fpu_begin.patch"
+ # Fix #542320
+ epatch "${FILESDIR}/15.9-preempt.patch"
+
+ # Compile fixes, #548118
+ epatch "${FILESDIR}/15.9-remove-gpl-symbols.patch"
+ epatch "${FILESDIR}/15.9-fpu.patch"
+ epatch "${FILESDIR}/15.9-kcl_str.patch"
+ epatch "${FILESDIR}/15.9-sep_printf.patch"
+ epatch "${FILESDIR}/15.9-mtrr.patch"
+
epatch_user
cd "${MODULE_DIR}"
@@ -393,7 +410,9 @@ src_install() {
#516816
if use gdm-hack; then
- sed -i 's#/proc/%i/fd/0#/etc/ati/xvrn#g' "${D}/usr/$(get_libdir)/xorg/modules/drivers/fglrx_drv.so" || die "Applying gdm-hack failed"
+ sed -i 's#/proc/%i/fd/0#/etc/ati/xvrn#g' \
+ "${D}/usr/$(get_libdir)/xorg/modules/drivers/fglrx_drv.so" || \
+ die "Applying gdm-hack failed"
fi
# Arch-specific files.
@@ -500,7 +519,9 @@ src_install-libs() {
#516816
if use gdm-hack; then
- sed -i 's#/proc/%i/fd/0#/etc/ati/xvrn#g' "${D}/${ATI_ROOT}/extensions/libglx.so" || die "Applying gdm-hack failed"
+ sed -i 's#/proc/%i/fd/0#/etc/ati/xvrn#g' \
+ "${D}/${ATI_ROOT}/extensions/libglx.so" \
+ || die "Applying gdm-hack failed"
fi
fi
@@ -585,10 +606,11 @@ pkg_postinst() {
"${ROOT}"/usr/bin/eselect opencl set --use-old amd
if has_version "x11-drivers/xf86-video-intel[sna]"; then
- ewarn "It is reported that xf86-video-intel built with USE=\"sna\" causes the X server"
- ewarn "to crash on systems that use hybrid AMD/Intel graphics. If you experience"
- ewarn "this crash, downgrade to xf86-video-intel-2.20.2 or earlier or"
- ewarn "try disabling sna for xf86-video-intel."
+ ewarn "It is reported that xf86-video-intel built with USE=\"sna\""
+ ewarn "causes the X server to crash on systems that use hybrid"
+ ewarn "AMD/Intel graphics. If you experience this crash, downgrade"
+ ewarn "to xf86-video-intel-2.20.2 or earlier or try disabling sna"
+ ewarn "for xf86-video-intel."
ewarn "For details, see https://bugs.gentoo.org/show_bug.cgi?id=430000"
fi
diff --git a/x11-drivers/ati-drivers/files/15.9-fpu.patch b/x11-drivers/ati-drivers/files/15.9-fpu.patch
new file mode 100644
index 00000000000..d059f146505
--- /dev/null
+++ b/x11-drivers/ati-drivers/files/15.9-fpu.patch
@@ -0,0 +1,39 @@
+--- a/common/lib/modules/fglrx/build_mod/firegl_public.c 2015-09-13 13:55:29.000000000 -0400
++++ b/common/lib/modules/fglrx/build_mod/firegl_public.c 2015-09-13 14:56:24.000000000 -0400
+@@ -192,8 +192,13 @@
+ #include <linux/string.h>
+ #include <linux/gfp.h>
+ #include <linux/swap.h>
++#if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
+ #include "asm/i387.h"
+-#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)
++#endif
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,2,0)
++#include <asm/fpu/internal.h>
++#define __HAVE_ARCH_CMPXCHG 1
++#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)
+ #include <asm/fpu-internal.h>
+ #endif
+
+@@ -3528,8 +3533,12 @@ int ATI_API_CALL KCL_InstallInterruptHan
+ #else
+ //when MSI enabled. keep irq disabled when calling the action handler,
+ //exclude this IRQ from irq balancing (only on one CPU)
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,1,0)
++ ((useMSI) ? (IRQF_NOBALANCING) : (IRQF_SHARED)),
++#else
+ ((useMSI) ? (IRQF_DISABLED) : (IRQF_SHARED)),
+ #endif
++#endif
+ dev_name,
+ context);
+ }
+@@ -6465,7 +6474,7 @@ void ATI_API_CALL KCL_create_uuid(void *
+ generate_random_uuid((char *)buf);
+ }
+
+-#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,15,0)
++#if (!defined(CONFIG_X86_64) || LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)) && LINUX_VERSION_CODE >= KERNEL_VERSION(3,15,0)
+ static int KCL_fpu_save_init(struct task_struct *tsk)
+ {
+ struct fpu *fpu = &tsk->thread.fpu;
diff --git a/x11-drivers/ati-drivers/files/15.9-kcl_str.patch b/x11-drivers/ati-drivers/files/15.9-kcl_str.patch
new file mode 100644
index 00000000000..20c3bc8a169
--- /dev/null
+++ b/x11-drivers/ati-drivers/files/15.9-kcl_str.patch
@@ -0,0 +1,14 @@
+--- a/common/lib/modules/fglrx/build_mod/kcl_str.c 2015-09-13 13:47:30.000000000 -0400
++++ b/common/lib/modules/fglrx/build_mod/kcl_str.c 2015-09-13 13:49:42.000000000 -0400
+@@ -169,7 +169,11 @@ int ATI_API_CALL KCL_STR_Strnicmp(const
+ const char* s2,
+ KCL_TYPE_SizeSigned count)
+ {
++#if LINUX_VERSION_CODE < KERNEL_VERSION(4,0,0)
+ return strnicmp(s1, s2, count);
++#else
++ return strncasecmp(s1, s2, count);
++#endif
+ }
+
+ /** \brief Locate character in string
diff --git a/x11-drivers/ati-drivers/files/15.9-mtrr.patch b/x11-drivers/ati-drivers/files/15.9-mtrr.patch
new file mode 100644
index 00000000000..bdf70b4ccdc
--- /dev/null
+++ b/x11-drivers/ati-drivers/files/15.9-mtrr.patch
@@ -0,0 +1,27 @@
+--- a/common/lib/modules/fglrx/build_mod/firegl_public.c 2015-09-19 23:43:22.000000000 -0400
++++ b/common/lib/modules/fglrx/build_mod/firegl_public.c 2015-09-19 23:52:07.000000000 -0400
+@@ -3442,7 +3442,11 @@ int ATI_API_CALL KCL_MEM_MTRR_Support(vo
+ int ATI_API_CALL KCL_MEM_MTRR_AddRegionWc(unsigned long base, unsigned long size)
+ {
+ #ifdef CONFIG_MTRR
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,3,0)
++ return arch_phys_wc_add(base, size);
++#else
+ return mtrr_add(base, size, MTRR_TYPE_WRCOMB, 1);
++#endif
+ #else /* !CONFIG_MTRR */
+ return -EPERM;
+ #endif /* !CONFIG_MTRR */
+@@ -3451,7 +3455,12 @@ int ATI_API_CALL KCL_MEM_MTRR_AddRegionW
+ int ATI_API_CALL KCL_MEM_MTRR_DeleteRegion(int reg, unsigned long base, unsigned long size)
+ {
+ #ifdef CONFIG_MTRR
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,3,0)
++ arch_phys_wc_del(reg);
++ return reg;
++#else
+ return mtrr_del(reg, base, size);
++#endif
+ #else /* !CONFIG_MTRR */
+ return -EPERM;
+ #endif /* !CONFIG_MTRR */
diff --git a/x11-drivers/ati-drivers/files/15.9-preempt.patch b/x11-drivers/ati-drivers/files/15.9-preempt.patch
new file mode 100644
index 00000000000..c6598835133
--- /dev/null
+++ b/x11-drivers/ati-drivers/files/15.9-preempt.patch
@@ -0,0 +1,103 @@
+--- a/common/lib/modules/fglrx/build_mod/firegl_public.c 2015-08-30 17:36:02.000000000 -0400
++++ b/common/lib/modules/fglrx/build_mod/firegl_public.c 2015-08-30 17:39:36.000000000 -0400
+@@ -21,6 +21,8 @@
+ !!! since it requires changes to linux/init/main.c.
+ #endif /* !MODULE */
+
++#include <linux/preempt.h>
++
+ // ============================================================
+ #include <linux/version.h>
+
+@@ -4997,7 +4999,9 @@ static unsigned int kas_spin_unlock(kas_
+ unsigned long ATI_API_CALL KAS_GetExecutionLevel(void)
+ {
+ unsigned long ret;
++ preempt_disable();
+ ret = kas_GetExecutionLevel();
++ preempt_enable();
+ return ret;
+ }
+
+@@ -5022,8 +5026,10 @@ unsigned int ATI_API_CALL KAS_Ih_Execute
+ KCL_DEBUG5(FN_FIREGL_KAS,"0x%08X, 0x%08X\n", ih_routine, ih_context);
+
+ //Prevent simultaneous entry on some SMP systems.
++ preempt_disable();
+ if (test_and_set_bit(0, (void *)&(kasContext.in_interrupts[smp_processor_id()])))
+ {
++ preempt_enable();
+ KCL_DEBUG1(FN_FIREGL_KAS, "The processor is handling the interrupt\n");
+ return IRQ_NONE;
+ }
+@@ -5036,9 +5042,9 @@ unsigned int ATI_API_CALL KAS_Ih_Execute
+
+ kasSetExecutionLevel(orig_level);
+ spin_unlock(&kasContext.lock_ih);
+-
+ clear_bit(0, (void *)&(kasContext.in_interrupts[smp_processor_id()]));
+ KCL_DEBUG5(FN_FIREGL_KAS,"%d\n", ret);
++ preempt_enable();
+
+ return ret;
+ }
+@@ -5256,6 +5262,7 @@ unsigned int ATI_API_CALL KAS_Spinlock_A
+
+ KCL_DEBUG5(FN_FIREGL_KAS,"0x%08X\n", hSpinLock);
+
++ preempt_disable();
+ spin_lock_info.routine_type = spinlock_obj->routine_type;
+ spin_lock_info.plock = &(spinlock_obj->lock);
+
+@@ -5263,6 +5270,7 @@ unsigned int ATI_API_CALL KAS_Spinlock_A
+
+ spinlock_obj->acquire_type = spin_lock_info.acquire_type;
+ spinlock_obj->flags = spin_lock_info.flags;
++ preempt_enable();
+
+ KCL_DEBUG5(FN_FIREGL_KAS,"%d\n", ret);
+ return ret;
+@@ -6034,6 +6042,8 @@ unsigned int ATI_API_CALL KAS_Interlocke
+
+ KCL_DEBUG5(FN_FIREGL_KAS,"0x%08X, 0x%08X, 0x%08X\n", hListHead, hListEntry, phPrevEntry);
+
++ preempt_disable();
++
+ /* Protect the operation with spinlock */
+ spin_lock_info.routine_type = listhead_obj->routine_type;
+ spin_lock_info.plock = &(listhead_obj->lock);
+@@ -6041,6 +6051,7 @@ unsigned int ATI_API_CALL KAS_Interlocke
+ if (!kas_spin_lock(&spin_lock_info))
+ {
+ KCL_DEBUG_ERROR("Unable to grab list spinlock\n");
++ preempt_enable();
+ return 0; /* No spinlock - no operation */
+ }
+
+@@ -6065,6 +6076,7 @@ unsigned int ATI_API_CALL KAS_Interlocke
+ spin_unlock_info.flags = spin_lock_info.flags;
+
+ ret = kas_spin_unlock(&spin_unlock_info);
++ preempt_enable();
+ KCL_DEBUG5(FN_FIREGL_KAS,"%d", ret);
+ return ret;
+ }
+@@ -6153,8 +6165,10 @@ unsigned int ATI_API_CALL KAS_Interlocke
+ spin_lock_info.routine_type = listhead_obj->routine_type;
+ spin_lock_info.plock = &(listhead_obj->lock);
+
++ preempt_disable();
+ if (!kas_spin_lock(&spin_lock_info))
+ {
++ preempt_enable();
+ KCL_DEBUG_ERROR("Unable to grab list spinlock");
+ return 0; /* No spinlock - no operation */
+ }
+@@ -6178,6 +6192,7 @@ unsigned int ATI_API_CALL KAS_Interlocke
+ spin_unlock_info.flags = spin_lock_info.flags;
+
+ ret = kas_spin_unlock(&spin_unlock_info);
++ preempt_enable();
+ KCL_DEBUG5(FN_FIREGL_KAS,"%d", ret);
+ return ret;
+ }
diff --git a/x11-drivers/ati-drivers/files/15.9-remove-gpl-symbols.patch b/x11-drivers/ati-drivers/files/15.9-remove-gpl-symbols.patch
new file mode 100644
index 00000000000..51fc6c22e60
--- /dev/null
+++ b/x11-drivers/ati-drivers/files/15.9-remove-gpl-symbols.patch
@@ -0,0 +1,74 @@
+--- a/common/lib/modules/fglrx/build_mod/firegl_public.c 2015-09-18 23:57:02.000000000 -0400
++++ b/common/lib/modules/fglrx/build_mod/firegl_public.c 2015-09-18 23:57:11.000000000 -0400
+@@ -136,7 +136,6 @@
+ #include <asm/mman.h>
+ #include <asm/uaccess.h>
+ #include <asm/processor.h>
+-#include <asm/tlbflush.h> // for flush_tlb_page
+ #include <asm/cpufeature.h>
+ #ifdef CONFIG_MTRR
+ #include <asm/mtrr.h>
+@@ -251,6 +250,26 @@
+ #define WRITE_CR4(x) write_cr4(x)
+ #endif
+
++#define __flush_tlb_one(addr) asm volatile("invlpg (%0)" ::"r" (addr) : "memory")
++#define __flush_tlb() native_write_cr3(native_read_cr3())
++
++static inline void __flush_tlb_all(void)
++{
++ if (cpu_has_pge)
++ {
++ unsigned long flags, cr4;
++ raw_local_irq_save(flags);
++ cr4 = native_read_cr4();
++ native_write_cr4(cr4 & ~X86_CR4_PGE);
++ native_write_cr4(cr4);
++ raw_local_irq_restore(flags);
++ }
++ else
++ {
++ __flush_tlb();
++ }
++}
++
+ // ============================================================
+ /* globals */
+
+@@ -6479,7 +6498,12 @@ static int KCL_fpu_save_init(struct task
+ void ATI_API_CALL KCL_fpu_begin(void)
+ {
+ #if defined(CONFIG_X86_64) || LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0)
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,2,0)
++ preempt_disable();
++ __kernel_fpu_begin();
++#else
+ kernel_fpu_begin();
++#endif
+ #else
+ #ifdef TS_USEDFPU
+ struct thread_info *cur_thread = current_thread_info();
+@@ -6525,7 +6549,12 @@ void ATI_API_CALL KCL_fpu_begin(void)
+ */
+ void ATI_API_CALL KCL_fpu_end(void)
+ {
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,2,0)
++ __kernel_fpu_end();
++ preempt_enable();
++#else
+ kernel_fpu_end();
++#endif
+ }
+
+ /** Create new directory entry under "/proc/...."
+--- a/common/lib/modules/fglrx/build_mod/kcl_acpi.c 2015-09-19 00:43:35.000000000 -0400
++++ b/common/lib/modules/fglrx/build_mod/kcl_acpi.c 2015-09-19 00:43:48.000000000 -0400
+@@ -868,7 +868,7 @@ void ATI_API_CALL KCL_ACPI_No_Hotplug(vo
+ #elif LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0)
+ if(pdev)
+ {
+-#if (UTS_UBUNTU_RELEASE_ABI < 0 && LINUX_VERSION_CODE < KERNEL_VERSION(4,1,3)) || (UTS_UBUNTU_RELEASE_ABI >= 0 && UTS_UBUNTU_RELEASE_ABI < 26 && LINUX_VERSION_CODE <= KERNEL_VERSION(3,19,8))
++#if 0 && (UTS_UBUNTU_RELEASE_ABI < 0 && LINUX_VERSION_CODE < KERNEL_VERSION(4,1,3)) || (UTS_UBUNTU_RELEASE_ABI >= 0 && UTS_UBUNTU_RELEASE_ABI < 26 && LINUX_VERSION_CODE <= KERNEL_VERSION(3,19,8))
+ pci_ignore_hotplug(pdev);
+ #else
+ pdev->ignore_hotplug = 1;
diff --git a/x11-drivers/ati-drivers/files/15.9-sep_printf.patch b/x11-drivers/ati-drivers/files/15.9-sep_printf.patch
new file mode 100644
index 00000000000..3e4e8d6499a
--- /dev/null
+++ b/x11-drivers/ati-drivers/files/15.9-sep_printf.patch
@@ -0,0 +1,11 @@
+--- a/common/lib/modules/fglrx/build_mod/firegl_public.c 2015-09-14 15:14:36.000000000 -0400
++++ b/common/lib/modules/fglrx/build_mod/firegl_public.c 2015-09-14 16:18:58.000000000 -0400
+@@ -649,6 +649,8 @@ static int firegl_major_proc_read(struct
+ *eof = 1;
+
+ len = snprintf(buf, request, "%d\n", major);
++#elif LINUX_VERSION_CODE >= KERNEL_VERSION(4,3,0)
++ seq_printf(m, "%d\n", major);
+ #else
+ len = seq_printf(m, "%d\n", major);
+ #endif