diff options
Diffstat (limited to 'target/linux/generic/backport-4.9/087-regmap-make-LZO-cache-optional.patch')
| -rw-r--r-- | target/linux/generic/backport-4.9/087-regmap-make-LZO-cache-optional.patch | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/target/linux/generic/backport-4.9/087-regmap-make-LZO-cache-optional.patch b/target/linux/generic/backport-4.9/087-regmap-make-LZO-cache-optional.patch new file mode 100644 index 0000000000..c26994ee35 --- /dev/null +++ b/target/linux/generic/backport-4.9/087-regmap-make-LZO-cache-optional.patch @@ -0,0 +1,69 @@ +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_AC97 || 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_AC97 +--- a/drivers/base/regmap/Makefile ++++ b/drivers/base/regmap/Makefile +@@ -2,7 +2,8 @@ + CFLAGS_regmap.o := -I$(src) + + obj-$(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-$(CONFIG_REGMAP_AC97) += regmap-ac97.o + obj-$(CONFIG_REGMAP_I2C) += regmap-i2c.o +--- a/drivers/base/regmap/regcache.c ++++ b/drivers/base/regmap/regcache.c +@@ -21,7 +21,9 @@ + + static const struct regcache_ops *cache_types[] = { + ®cache_rbtree_ops, ++#if IS_ENABLED(CONFIG_REGCACHE_COMPRESSED) + ®cache_lzo_ops, ++#endif + ®cache_flat_ops, + }; + |