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authorJonas Gorski <jonas.gorski@gmail.com>2017-06-08 10:40:50 +0200
committerJonas Gorski <jonas.gorski@gmail.com>2017-06-10 12:40:37 +0200
commitfd1096e351b7cfb0a7eb8bee7eceff52e7c7c499 (patch)
tree3a8e1cdbeff0e58610c26d55ce535954479a02db /target/linux/generic/patches-3.18
parentf9b7bfa088a9293959bc25eefa6a764736190661 (diff)
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kernel: make regmap LZO cache optional
There are no users, so hide it and let future users select it. Saves about ~17 kB on MIPS. Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Diffstat (limited to 'target/linux/generic/patches-3.18')
-rw-r--r--target/linux/generic/patches-3.18/087-regmap-make-LZO-cache-optional.patch67
-rw-r--r--target/linux/generic/patches-3.18/259-regmap_dynamic.patch19
2 files changed, 80 insertions, 6 deletions
diff --git a/target/linux/generic/patches-3.18/087-regmap-make-LZO-cache-optional.patch b/target/linux/generic/patches-3.18/087-regmap-make-LZO-cache-optional.patch
new file mode 100644
index 0000000000..94b61fdab4
--- /dev/null
+++ b/target/linux/generic/patches-3.18/087-regmap-make-LZO-cache-optional.patch
@@ -0,0 +1,67 @@
+From de88e9b0354c2e3ff8eae3f97afe43a34f5ed239 Mon Sep 17 00:00:00 2001
+From: Jonas Gorski <jonas.gorski@gmail.com>
+Date: Sat, 13 May 2017 13:03:21 +0200
+Subject: [PATCH] regmap: make LZO cache optional
+
+Commit 2cbbb579bcbe3 ("regmap: Add the LZO cache support") added support
+for LZO compression in regcache, but there were never any users added
+afterwards. Since LZO support itself has its own size, it currently is
+rather a deoptimization.
+
+So make it optional by introducing a symbol that can be selected by
+drivers wanting to make use of it.
+
+Saves e.g. ~46 kB on MIPS (size of LZO support + regcache LZO code).
+
+Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
+---
+I tried using google to find any users (even out-of-tree ones), but at
+best I found a single driver submission that was switched to RBTREE in
+subsequent resubmissions (MFD_SMSC).
+
+One could maybe also just drop the code because of no users for 5 years,
+but that would be up to the maintainer(s) to decide.
+
+ drivers/base/regmap/Kconfig | 5 ++++-
+ drivers/base/regmap/Makefile | 3 ++-
+ drivers/base/regmap/regcache.c | 2 ++
+ 3 files changed, 8 insertions(+), 2 deletions(-)
+
+--- a/drivers/base/regmap/Kconfig
++++ b/drivers/base/regmap/Kconfig
+@@ -4,9 +4,12 @@
+
+ config REGMAP
+ default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_SPMI || REGMAP_MMIO || REGMAP_IRQ)
++ select IRQ_DOMAIN if REGMAP_IRQ
++ bool
++
++config REGCACHE_COMPRESSED
+ select LZO_COMPRESS
+ select LZO_DECOMPRESS
+- select IRQ_DOMAIN if REGMAP_IRQ
+ bool
+
+ config REGMAP_I2C
+--- a/drivers/base/regmap/Makefile
++++ b/drivers/base/regmap/Makefile
+@@ -1,5 +1,6 @@
+ obj-$(CONFIG_REGMAP) += regmap.o regcache.o
+-obj-$(CONFIG_REGMAP) += regcache-rbtree.o regcache-lzo.o regcache-flat.o
++obj-$(CONFIG_REGMAP) += regcache-rbtree.o regcache-flat.o
++obj-$(CONFIG_REGCACHE_COMPRESSED) += regcache-lzo.o
+ obj-$(CONFIG_DEBUG_FS) += regmap-debugfs.o
+ obj-$(CONFIG_REGMAP_I2C) += regmap-i2c.o
+ obj-$(CONFIG_REGMAP_SPI) += regmap-spi.o
+--- a/drivers/base/regmap/regcache.c
++++ b/drivers/base/regmap/regcache.c
+@@ -21,7 +21,9 @@
+
+ static const struct regcache_ops *cache_types[] = {
+ &regcache_rbtree_ops,
++#if IS_ENABLED(CONFIG_REGCACHE_COMPRESSED)
+ &regcache_lzo_ops,
++#endif
+ &regcache_flat_ops,
+ };
+
diff --git a/target/linux/generic/patches-3.18/259-regmap_dynamic.patch b/target/linux/generic/patches-3.18/259-regmap_dynamic.patch
index b1d4ad2772..5e422ebd48 100644
--- a/target/linux/generic/patches-3.18/259-regmap_dynamic.patch
+++ b/target/linux/generic/patches-3.18/259-regmap_dynamic.patch
@@ -1,16 +1,19 @@
--- a/drivers/base/regmap/Kconfig
+++ b/drivers/base/regmap/Kconfig
-@@ -3,26 +3,31 @@
+@@ -3,9 +3,8 @@
# subsystems should select the appropriate symbols.
config REGMAP
- default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_SPMI || REGMAP_MMIO || REGMAP_IRQ)
- select LZO_COMPRESS
- select LZO_DECOMPRESS
select IRQ_DOMAIN if REGMAP_IRQ
- bool
+ tristate "Regmap"
+ config REGCACHE_COMPRESSED
+ select LZO_COMPRESS
+@@ -13,19 +12,25 @@ config REGCACHE_COMPRESSED
+ bool
+
config REGMAP_I2C
- tristate
+ tristate "Regmap I2C"
@@ -50,14 +53,18 @@
/* Unspecified -> 0 -> Backwards compatible default */
--- a/drivers/base/regmap/Makefile
+++ b/drivers/base/regmap/Makefile
-@@ -1,6 +1,8 @@
+@@ -1,7 +1,11 @@
-obj-$(CONFIG_REGMAP) += regmap.o regcache.o
--obj-$(CONFIG_REGMAP) += regcache-rbtree.o regcache-lzo.o regcache-flat.o
+-obj-$(CONFIG_REGMAP) += regcache-rbtree.o regcache-flat.o
+-obj-$(CONFIG_REGCACHE_COMPRESSED) += regcache-lzo.o
-obj-$(CONFIG_DEBUG_FS) += regmap-debugfs.o
-+regmap-core-objs = regmap.o regcache.o regcache-rbtree.o regcache-lzo.o regcache-flat.o
++regmap-core-objs = regmap.o regcache.o regcache-rbtree.o regcache-flat.o
+ifdef CONFIG_DEBUG_FS
+regmap-core-objs += regmap-debugfs.o
+endif
++ifdef CONFIG_REGCACHE_COMPRESSED
++regmap-core-objs += regcache-lzo.o
++endif
+obj-$(CONFIG_REGMAP) += regmap-core.o
obj-$(CONFIG_REGMAP_I2C) += regmap-i2c.o
obj-$(CONFIG_REGMAP_SPI) += regmap-spi.o