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authorChris Metcalf <cmetcalf@tilera.com>2012-03-29 21:39:51 +0400
committerChris Metcalf <cmetcalf@tilera.com>2012-05-25 20:48:23 +0400
commit47d632f9f8f3ed62b21f725e98b726d65769b6d7 (patch)
tree9599e3a0106ee320b293be1dbc2d4dbb93b6e1ff /arch/tile/kernel
parent1efea40d4172a2a475ccb29b59d6221e9d0c174b (diff)
downloadlinux-47d632f9f8f3ed62b21f725e98b726d65769b6d7.tar.xz
arch/tile: optimize get_user/put_user and friends
Use direct load/store for the get_user/put_user. Previously, we would call out to a helper routine that would do the appropriate thing and then return, handling the possible exception internally. Now we inline the load or store, along with a "we succeeded" indication in a register; if the load or store faults, we write a "we failed" indication into the same register and then return to the following instruction. This is more efficient and gives us more compact code, as well as being more in line with what other architectures do. The special futex assembly source file for TILE-Gx also disappears in this change; we just use the same inlining idiom there as well, putting the appropriate atomic operations directly into futex_atomic_op_inuser() (and thus into the FUTEX_WAIT function). The underlying atomic copy_from_user, copy_to_user functions were renamed using the (cryptic) x86 convention as copy_from_user_ll and copy_to_user_ll. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Diffstat (limited to 'arch/tile/kernel')
-rw-r--r--arch/tile/kernel/Makefile1
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/tile/kernel/Makefile b/arch/tile/kernel/Makefile
index b4dbc057baad..d6261e4670fe 100644
--- a/arch/tile/kernel/Makefile
+++ b/arch/tile/kernel/Makefile
@@ -9,7 +9,6 @@ obj-y := backtrace.o entry.o init_task.o irq.o messaging.o \
intvec_$(BITS).o regs_$(BITS).o tile-desc_$(BITS).o
obj-$(CONFIG_HARDWALL) += hardwall.o
-obj-$(CONFIG_TILEGX) += futex_64.o
obj-$(CONFIG_COMPAT) += compat.o compat_signal.o
obj-$(CONFIG_SMP) += smpboot.o smp.o tlb.o
obj-$(CONFIG_MODULES) += module.o