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authorMateusz Guzik <mjguzik@gmail.com>2023-08-12 19:15:54 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2023-08-12 19:18:47 +0300
commitc8afaa1b0f8bc93d013ab2ea6b9649958af3f1d3 (patch)
treecdf2d4c2f22ab40d7d31ba99ffdce18e3dfcc6cd /arch/sparc/include
parent3feecb1b848359b152dd66b26c24c2454a64fc15 (diff)
downloadlinux-c8afaa1b0f8bc93d013ab2ea6b9649958af3f1d3.tar.xz
locking: remove spin_lock_prefetch
The only remaining consumer is new_inode, where it showed up in 2001 as commit c37fa164f793 ("v2.4.9.9 -> v2.4.9.10") in a historical repo [1] with a changelog which does not mention it. Since then the line got only touched up to keep compiling. While it may have been of benefit back in the day, it is guaranteed to at best not get in the way in the multicore setting -- as the code performs *a lot* of work between the prefetch and actual lock acquire, any contention means the cacheline is already invalid by the time the routine calls spin_lock(). It adds spurious traffic, for short. On top of it prefetch is notoriously tricky to use for single-threaded purposes, making it questionable from the get go. As such, remove it. I admit upfront I did not see value in benchmarking this change, but I can do it if that is deemed appropriate. Removal from new_inode and of the entire thing are in the same patch as requested by Linus, so whatever weird looks can be directed at that guy. Link: https://git.kernel.org/pub/scm/linux/kernel/git/tglx/history.git/commit/fs/inode.c?id=c37fa164f793735b32aa3f53154ff1a7659e6442 [1] Signed-off-by: Mateusz Guzik <mjguzik@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/sparc/include')
-rw-r--r--arch/sparc/include/asm/processor_64.h3
1 files changed, 0 insertions, 3 deletions
diff --git a/arch/sparc/include/asm/processor_64.h b/arch/sparc/include/asm/processor_64.h
index 2667f35d5ea5..0a0d5c3d184c 100644
--- a/arch/sparc/include/asm/processor_64.h
+++ b/arch/sparc/include/asm/processor_64.h
@@ -213,7 +213,6 @@ unsigned long __get_wchan(struct task_struct *task);
*/
#define ARCH_HAS_PREFETCH
#define ARCH_HAS_PREFETCHW
-#define ARCH_HAS_SPINLOCK_PREFETCH
static inline void prefetch(const void *x)
{
@@ -239,8 +238,6 @@ static inline void prefetchw(const void *x)
: "r" (x));
}
-#define spin_lock_prefetch(x) prefetchw(x)
-
#define HAVE_ARCH_PICK_MMAP_LAYOUT
int do_mathemu(struct pt_regs *regs, struct fpustate *f, bool illegal_insn_trap);