The patch titled
spinlocks: remove 'volatile'
has been added to the -mm tree. Its filename is
spinlocks-remove-volatile.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: spinlocks: remove 'volatile'
From: Ingo Molnar <mingo@xxxxxxx>
Remove 'volatile' from the spinlock types, it causes gcc to generate really
bad code. (and it's pointless anyway)
This reduces the non-debug SMP kernel's size by 0.2% (!).
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
Cc: Andi Kleen <ak@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
include/asm-i386/spinlock_types.h | 4 ++--
include/asm-x86_64/spinlock_types.h | 4 ++--
2 files changed, 4 insertions(+), 4 deletions(-)
diff -puN include/asm-i386/spinlock_types.h~spinlocks-remove-volatile include/asm-i386/spinlock_types.h
--- a/include/asm-i386/spinlock_types.h~spinlocks-remove-volatile
+++ a/include/asm-i386/spinlock_types.h
@@ -6,13 +6,13 @@
#endif
typedef struct {
- volatile unsigned int slock;
+ unsigned int slock;
} raw_spinlock_t;
#define __RAW_SPIN_LOCK_UNLOCKED { 1 }
typedef struct {
- volatile unsigned int lock;
+ unsigned int lock;
} raw_rwlock_t;
#define __RAW_RW_LOCK_UNLOCKED { RW_LOCK_BIAS }
diff -puN include/asm-x86_64/spinlock_types.h~spinlocks-remove-volatile include/asm-x86_64/spinlock_types.h
--- a/include/asm-x86_64/spinlock_types.h~spinlocks-remove-volatile
+++ a/include/asm-x86_64/spinlock_types.h
@@ -6,13 +6,13 @@
#endif
typedef struct {
- volatile unsigned int slock;
+ unsigned int slock;
} raw_spinlock_t;
#define __RAW_SPIN_LOCK_UNLOCKED { 1 }
typedef struct {
- volatile unsigned int lock;
+ unsigned int lock;
} raw_rwlock_t;
#define __RAW_RW_LOCK_UNLOCKED { RW_LOCK_BIAS }
_
Patches currently in -mm which might be from mingo@xxxxxxx are
disable-debugging-version-of-write_lock.patch
my-name-is-ingo-molnar-you-killed-my-make-allyesconfig-prepare-to-die.patch
git-netdev-all.patch
lockdep-fix-atm-ipcommonc-deadlock.patch
lockdep-annotate-8390c-disable_irq-2.patch
lockdep-fix-sk_dst_check-deadlock.patch
revert-gregkh-pci-pci-test-that-drivers-properly-call-pci_set_master.patch
sched-fix-bug-in-__migrate_task.patch
small-kernel-schedc-cleanup.patch
x86-re-enable-generic-numa.patch
i386-early-fault-handler.patch
minor-cleanup-to-lockdepc.patch
lockdep-add-more-rwsemh-documentation.patch
improve-lockdep-debug-output.patch
lockdep-core-reduce-per-lock-class-cache-size.patch
lockdep-clean-up-completion-initializer-in-smpbootc.patch
spinlocks-remove-volatile.patch
sched-add-above-background-load-function.patch
mm-implement-swap-prefetching.patch
sched-cleanup-remove-task_t-convert-to-struct-task_struct-prefetch.patch
genirq-convert-the-x86_64-architecture-to-irq-chips.patch
genirq-convert-the-i386-architecture-to-irq-chips.patch
genirq-irq-convert-the-move_irq-flag-from-a-32bit-word-to-a-single-bit.patch
genirq-irq-add-moved_masked_irq.patch
genirq-x86_64-irq-reenable-migrating-irqs-to-other-cpus.patch
genirq-msi-simplify-msi-enable-and-disable.patch
genirq-msi-make-the-msi-boolean-tests-return-either-0-or-1.patch
genirq-msi-implement-helper-functions-read_msi_msg-and-write_msi_msg.patch
genirq-msi-refactor-the-msi_ops.patch
genirq-msi-simplify-the-msi-irq-limit-policy.patch
genirq-irq-add-a-dynamic-irq-creation-api.patch
genirq-ia64-irq-dynamic-irq-support.patch
genirq-i386-irq-dynamic-irq-support.patch
genirq-x86_64-irq-dynamic-irq-support.patch
genirq-msi-make-the-msi-code-irq-based-and-not-vector-based.patch
genirq-x86_64-irq-move-msi-message-composition-into-io_apicc.patch
genirq-i386-irq-move-msi-message-composition-into-io_apicc.patch
genirq-msi-only-build-msi-apicc-on-ia64.patch
genirq-x86_64-irq-remove-the-msi-assumption-that-irq-==-vector.patch
genirq-i386-irq-remove-the-msi-assumption-that-irq-==-vector.patch
genirq-irq-remove-msi-hacks.patch
genirq-irq-generalize-the-check-for-hardirq_bits.patch
genirq-x86_64-irq-make-the-external-irq-handlers-report-their-vector-not-the-irq-number.patch
genirq-x86_64-irq-make-vector_irq-per-cpu.patch
genirq-x86_64-irq-kill-gsi_irq_sharing.patch
genirq-x86_64-irq-kill-irq-compression.patch
detect-atomic-counter-underflows.patch
debug-shared-irqs.patch
make-frame_pointer-default=y.patch
mutex-subsystem-synchro-test-module.patch
vdso-print-fatal-signals.patch
vdso-improve-print_fatal_signals-support-by-adding-memory-maps.patch
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