From: Peter Zijlstra <peterz@infradead.org>
Date: Thu, 6 Aug 2020 14:35:11 +0200
Subject: locking/seqlock, headers: Untangle the spaghetti monster
Patch-mainline: v5.9-rc1
Git-commit: 0cd39f4600ed4de859383018eb10f0f724900e1b
References: bsc#1176564 bsc#1162702
By using lockdep_assert_*() from seqlock.h, the spaghetti monster
attacked.
Attack back by reducing seqlock.h dependencies from two key high level headers:
- <linux/seqlock.h>: -Remove <linux/ww_mutex.h>
- <linux/time.h>: -Remove <linux/seqlock.h>
- <linux/sched.h>: +Add <linux/seqlock.h>
The price was to add it to sched.h ...
Core header fallout, we add direct header dependencies instead of gaining them
parasitically from higher level headers:
- <linux/dynamic_queue_limits.h>: +Add <asm/bug.h>
- <linux/hrtimer.h>: +Add <linux/seqlock.h>
- <linux/ktime.h>: +Add <asm/bug.h>
- <linux/lockdep.h>: +Add <linux/smp.h>
- <linux/sched.h>: +Add <linux/seqlock.h>
- <linux/videodev2.h>: +Add <linux/kernel.h>
Arch headers fallout:
- PARISC: <asm/timex.h>: +Add <asm/special_insns.h>
- SH: <asm/io.h>: +Add <asm/page.h>
- SPARC: <asm/timer_64.h>: +Add <uapi/asm/asi.h>
- SPARC: <asm/vvar.h>: +Add <asm/processor.h>, <asm/barrier.h>
-Remove <linux/seqlock.h>
- X86: <asm/fixmap.h>: +Add <asm/pgtable_types.h>
-Remove <asm/acpi.h>
There's also a bunch of parasitic header dependency fallout in .c files, not listed
separately.
[ mingo: Extended the changelog, split up & fixed the original patch. ]
Co-developed-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20200804133438.GK2674@hirez.programming.kicks-ass.net
[ dwagner:
- <linux/lockdep.h>: -Remove <linux/smp.h>
- <linux/seqlock.h>: +Add <linux/ww_mutex.h>
See patches.rt/mutex-move-the-ww_mutext-definition-back-to-ww_mutex.h.patch
- <include/vdso/helpers.h>: +Add <linux/processor.h>
Missing <asm/io.h> added to
- arch/x86/events/intel/ds.c
- drivers/firmware/efi/capsule-loader.c
- drivers/misc/vmw_balloon.c
- drivers/virt/vboxguest/vboxguest_core.c
- drivers/virt/vboxguest/vboxguest_utils.c
Missing <asm/vmalloc.h>
- arch/x86/kernel/ftrace.c
- arch/x86/kernel/kprobes/core.c
]
Acked-by: Daniel Wagner <dwagner@suse.de>
---
arch/sh/kernel/machvec.c | 1 +
arch/sparc/include/asm/timer_64.h | 1 +
arch/sparc/include/asm/vvar.h | 3 ++-
arch/sparc/kernel/vdso.c | 1 -
arch/x86/events/intel/ds.c | 1 +
arch/x86/include/asm/fixmap.h | 2 +-
arch/x86/kernel/apic/apic_noop.c | 1 +
arch/x86/kernel/apic/hw_nmi.c | 1 +
arch/x86/kernel/apic/probe_64.c | 1 +
arch/x86/kernel/cpu/amd.c | 1 +
arch/x86/kernel/cpu/common.c | 1 +
arch/x86/kernel/cpu/hygon.c | 1 +
arch/x86/kernel/cpu/intel.c | 1 +
arch/x86/kernel/ftrace.c | 1 +
arch/x86/kernel/jailhouse.c | 1 +
arch/x86/kernel/kprobes/core.c | 1 +
arch/x86/kernel/tsc_msr.c | 1 +
arch/x86/mm/init_32.c | 1 +
arch/x86/xen/apic.c | 1 +
arch/x86/xen/smp_hvm.c | 1 +
arch/x86/xen/suspend_pv.c | 4 ++--
drivers/firmware/efi/capsule-loader.c | 2 ++
drivers/misc/vmw_balloon.c | 1 +
drivers/virt/vboxguest/vboxguest_core.c | 1 +
drivers/virt/vboxguest/vboxguest_utils.c | 1 +
include/linux/dynamic_queue_limits.h | 2 ++
include/linux/hrtimer.h | 1 +
include/linux/ktime.h | 1 +
include/linux/mutex.h | 11 +++++++++++
include/linux/sched.h | 1 +
include/linux/seqlock.h | 2 +-
include/linux/time.h | 1 -
include/linux/videodev2.h | 1 +
include/linux/ww_mutex.h | 8 --------
include/vdso/helpers.h | 1 +
35 files changed, 46 insertions(+), 15 deletions(-)
--- a/arch/sh/kernel/machvec.c
+++ b/arch/sh/kernel/machvec.c
@@ -15,6 +15,7 @@
#include <asm/setup.h>
#include <asm/io.h>
#include <asm/irq.h>
+#include <asm/processor.h>
#define MV_NAME_SIZE 32
--- a/arch/sparc/include/asm/timer_64.h
+++ b/arch/sparc/include/asm/timer_64.h
@@ -7,6 +7,7 @@
#ifndef _SPARC64_TIMER_H
#define _SPARC64_TIMER_H
+#include <uapi/asm/asi.h>
#include <linux/types.h>
#include <linux/init.h>
--- a/arch/sparc/include/asm/vvar.h
+++ b/arch/sparc/include/asm/vvar.h
@@ -6,7 +6,8 @@
#define _ASM_SPARC_VVAR_DATA_H
#include <asm/clocksource.h>
-#include <linux/seqlock.h>
+#include <asm/processor.h>
+#include <asm/barrier.h>
#include <linux/time.h>
#include <linux/types.h>
--- a/arch/sparc/kernel/vdso.c
+++ b/arch/sparc/kernel/vdso.c
@@ -7,7 +7,6 @@
* a different vsyscall implementation for Linux/IA32 and for the name.
*/
-#include <linux/seqlock.h>
#include <linux/time.h>
#include <linux/timekeeper_internal.h>
--- a/arch/x86/events/intel/ds.c
+++ b/arch/x86/events/intel/ds.c
@@ -7,6 +7,7 @@
#include <asm/perf_event.h>
#include <asm/tlbflush.h>
#include <asm/insn.h>
+#include <asm/io.h>
#include "../perf_event.h"
--- a/arch/x86/include/asm/fixmap.h
+++ b/arch/x86/include/asm/fixmap.h
@@ -26,9 +26,9 @@
#ifndef __ASSEMBLY__
#include <linux/kernel.h>
-#include <asm/acpi.h>
#include <asm/apicdef.h>
#include <asm/page.h>
+#include <asm/pgtable_types.h>
#ifdef CONFIG_X86_32
#include <linux/threads.h>
#include <asm/kmap_types.h>
--- a/arch/x86/kernel/apic/apic_noop.c
+++ b/arch/x86/kernel/apic/apic_noop.c
@@ -10,6 +10,7 @@
* like self-ipi, etc...
*/
#include <linux/cpumask.h>
+#include <linux/thread_info.h>
#include <asm/apic.h>
--- a/arch/x86/kernel/apic/hw_nmi.c
+++ b/arch/x86/kernel/apic/hw_nmi.c
@@ -9,6 +9,7 @@
* Bits copied from original nmi.c file
*
*/
+#include <linux/thread_info.h>
#include <asm/apic.h>
#include <asm/nmi.h>
--- a/arch/x86/kernel/apic/probe_64.c
+++ b/arch/x86/kernel/apic/probe_64.c
@@ -8,6 +8,7 @@
* Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
* James Cleverdon.
*/
+#include <linux/thread_info.h>
#include <asm/apic.h>
#include "local.h"
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -15,6 +15,7 @@
#include <asm/cpu.h>
#include <asm/spec-ctrl.h>
#include <asm/smp.h>
+#include <asm/numa.h>
#include <asm/pci-direct.h>
#include <asm/delay.h>
#include <asm/debugreg.h>
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -43,6 +43,7 @@
#include <asm/mtrr.h>
#include <asm/hwcap2.h>
#include <linux/numa.h>
+#include <asm/numa.h>
#include <asm/asm.h>
#include <asm/bugs.h>
#include <asm/cpu.h>
--- a/arch/x86/kernel/cpu/hygon.c
+++ b/arch/x86/kernel/cpu/hygon.c
@@ -10,6 +10,7 @@
#include <asm/cpu.h>
#include <asm/smp.h>
+#include <asm/numa.h>
#include <asm/cacheinfo.h>
#include <asm/spec-ctrl.h>
#include <asm/delay.h>
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -22,6 +22,7 @@
#include <asm/cpu_device_id.h>
#include <asm/cmdline.h>
#include <asm/resctrl.h>
+#include <asm/numa.h>
#ifdef CONFIG_X86_64
#include <linux/topology.h>
--- a/arch/x86/kernel/ftrace.c
+++ b/arch/x86/kernel/ftrace.c
@@ -24,6 +24,7 @@
#include <linux/list.h>
#include <linux/module.h>
#include <linux/memory.h>
+#include <linux/vmalloc.h>
#include <trace/syscall.h>
--- a/arch/x86/kernel/jailhouse.c
+++ b/arch/x86/kernel/jailhouse.c
@@ -12,6 +12,7 @@
#include <linux/kernel.h>
#include <linux/reboot.h>
#include <asm/apic.h>
+#include <asm/acpi.h>
#include <asm/cpu.h>
#include <asm/hypervisor.h>
#include <asm/i8259.h>
--- a/arch/x86/kernel/kprobes/core.c
+++ b/arch/x86/kernel/kprobes/core.c
@@ -40,6 +40,7 @@
#include <linux/frame.h>
#include <linux/kasan.h>
#include <linux/moduleloader.h>
+#include <linux/vmalloc.h>
#include <asm/text-patching.h>
#include <asm/cacheflush.h>
--- a/arch/x86/kernel/tsc_msr.c
+++ b/arch/x86/kernel/tsc_msr.c
@@ -7,6 +7,7 @@
*/
#include <linux/kernel.h>
+#include <linux/thread_info.h>
#include <asm/apic.h>
#include <asm/cpu_device_id.h>
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -52,6 +52,7 @@
#include <asm/page_types.h>
#include <asm/cpu_entry_area.h>
#include <asm/init.h>
+#include <asm/numa.h>
#include "mm_internal.h"
--- a/arch/x86/xen/apic.c
+++ b/arch/x86/xen/apic.c
@@ -1,5 +1,6 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/init.h>
+#include <linux/thread_info.h>
#include <asm/x86_init.h>
#include <asm/apic.h>
--- a/arch/x86/xen/smp_hvm.c
+++ b/arch/x86/xen/smp_hvm.c
@@ -1,4 +1,5 @@
// SPDX-License-Identifier: GPL-2.0
+#include <linux/thread_info.h>
#include <asm/smp.h>
#include <xen/events.h>
--- a/arch/x86/xen/suspend_pv.c
+++ b/arch/x86/xen/suspend_pv.c
@@ -1,11 +1,11 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/types.h>
-#include <asm/fixmap.h>
-
#include <asm/xen/hypercall.h>
#include <asm/xen/page.h>
+#include <asm/fixmap.h>
+
#include "xen-ops.h"
void xen_pv_pre_suspend(void)
--- a/drivers/firmware/efi/capsule-loader.c
+++ b/drivers/firmware/efi/capsule-loader.c
@@ -16,6 +16,8 @@
#include <linux/efi.h>
#include <linux/vmalloc.h>
+#include <asm/io.h>
+
#define NO_FURTHER_WRITE_ACTION -1
/**
--- a/drivers/misc/vmw_balloon.c
+++ b/drivers/misc/vmw_balloon.c
@@ -34,6 +34,7 @@
#include <linux/vmw_vmci_defs.h>
#include <linux/vmw_vmci_api.h>
#include <asm/hypervisor.h>
+#include <asm/io.h>
MODULE_AUTHOR("VMware, Inc.");
MODULE_DESCRIPTION("VMware Memory Control (Balloon) Driver");
--- a/drivers/virt/vboxguest/vboxguest_core.c
+++ b/drivers/virt/vboxguest/vboxguest_core.c
@@ -13,6 +13,7 @@
#include <linux/vbox_err.h>
#include <linux/vbox_utils.h>
#include <linux/vmalloc.h>
+#include <asm/io.h>
#include "vboxguest_core.h"
#include "vboxguest_version.h"
--- a/drivers/virt/vboxguest/vboxguest_utils.c
+++ b/drivers/virt/vboxguest/vboxguest_utils.c
@@ -16,6 +16,7 @@
#include <linux/vmalloc.h>
#include <linux/vbox_err.h>
#include <linux/vbox_utils.h>
+#include <asm/io.h>
#include "vboxguest_core.h"
/* Get the pointer to the first parameter of a HGCM call request. */
--- a/include/linux/dynamic_queue_limits.h
+++ b/include/linux/dynamic_queue_limits.h
@@ -38,6 +38,8 @@
#ifdef __KERNEL__
+#include <asm/bug.h>
+
struct dql {
/* Fields accessed in enqueue path (dql_queued) */
unsigned int num_queued; /* Total ever queued */
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -17,6 +17,7 @@
#include <linux/init.h>
#include <linux/list.h>
#include <linux/percpu.h>
+#include <linux/seqlock.h>
#include <linux/timer.h>
#include <linux/timerqueue.h>
--- a/include/linux/ktime.h
+++ b/include/linux/ktime.h
@@ -23,6 +23,7 @@
#include <linux/time.h>
#include <linux/jiffies.h>
+#include <asm/bug.h>
/* Nanosecond scalar representation for kernel time values */
typedef s64 ktime_t;
--- a/include/linux/mutex.h
+++ b/include/linux/mutex.h
@@ -65,6 +65,17 @@ struct mutex {
#endif
};
+struct ww_class;
+struct ww_acquire_ctx;
+
+struct ww_mutex {
+ struct mutex base;
+ struct ww_acquire_ctx *ctx;
+#ifdef CONFIG_DEBUG_MUTEXES
+ struct ww_class *ww_class;
+#endif
+};
+
/*
* This is the control structure for tasks blocked on mutex,
* which resides on the blocked task's kernel stack:
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -31,6 +31,7 @@
#include <linux/task_io_accounting.h>
#include <linux/posix-timers.h>
#include <linux/rseq.h>
+#include <linux/seqlock.h>
/* task_struct member predeclarations (sorted alphabetically): */
struct audit_context;
--- a/include/linux/seqlock.h
+++ b/include/linux/seqlock.h
@@ -16,9 +16,9 @@
#include <linux/compiler.h>
#include <linux/lockdep.h>
#include <linux/mutex.h>
+#include <linux/ww_mutex.h>
#include <linux/preempt.h>
#include <linux/spinlock.h>
-#include <linux/ww_mutex.h>
#include <asm/processor.h>
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -3,7 +3,6 @@
#define _LINUX_TIME_H
# include <linux/cache.h>
-# include <linux/seqlock.h>
# include <linux/math64.h>
# include <linux/time64.h>
--- a/include/linux/videodev2.h
+++ b/include/linux/videodev2.h
@@ -57,6 +57,7 @@
#define __LINUX_VIDEODEV2_H
#include <linux/time.h> /* need struct timeval */
+#include <linux/kernel.h>
#include <uapi/linux/videodev2.h>
#endif /* __LINUX_VIDEODEV2_H */
--- a/include/linux/ww_mutex.h
+++ b/include/linux/ww_mutex.h
@@ -48,14 +48,6 @@ struct ww_acquire_ctx {
#endif
};
-struct ww_mutex {
- struct mutex base;
- struct ww_acquire_ctx *ctx;
-#ifdef CONFIG_DEBUG_MUTEXES
- struct ww_class *ww_class;
-#endif
-};
-
#ifdef CONFIG_DEBUG_LOCK_ALLOC
# define __WW_CLASS_MUTEX_INITIALIZER(lockname, class) \
, .ww_class = class
--- a/include/vdso/helpers.h
+++ b/include/vdso/helpers.h
@@ -5,6 +5,7 @@
#ifndef __ASSEMBLY__
#include <vdso/datapage.h>
+#include <asm/processor.h>
static __always_inline u32 vdso_read_begin(const struct vdso_data *vd)
{