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3fce12568a
Jonas Gorski commented on the previous patch:
|This is actually the wrong fix and papers over an issue in one of our
|local patches.
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|We intentionally allow regmap to be built as a module, see
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|/target/linux/generic/hack-4.14/259-regmap_dynamic.patch
|[...]
|[The regulator code] optionally supports regmap thanks to the stubs
|provided if regmap is disabled - which breaks if you compile regmap
|as a module.
In order to mitigate this issue, this patch reverts the previous patch
and replaces the existing IS_ENABLED(CONFIG_REGMAP) with
IS_REACHABLE(CONFIG_REGMAP). This solves this particular issue as the
regulator code will now automatically fallback to the regmap stubs in
case the kmod-regmap module is enabled, but nothing else sets
CONFIG_REGMAP=y.
Note: There's still a potential issue that this patch doesn't solve:
If someone ever wants to make a OpenWrt kernel package for a
regulator module that requires the REGMAP feature for a target that
doesn't set CONFIG_REGMAP=y but has CONFIG_REGULATOR=y, the resulting
kmod-regulator-xyz package will not work on the target.
Luckily, there aren't any in-tree OpenWrt kernel module packages for
regulators at the moment. On the bright side: regmap is a critical
part nowadays and all new and upcoming architectures require it by
default. This will likely only ever be a problem for legacy targets
and devices that cannot afford to enable REGMAP.
Cc: Jonas Gorski <jonas.gorski@gmail.com>
Cc: John Crispin <john@phrozen.org>
Fixes: d00913d121 ("kernel: modules: fix kmod-regmap")
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
110 lines
2.8 KiB
Diff
110 lines
2.8 KiB
Diff
From 811d9e2268a62b830cfe93cd8bc929afcb8b198b Mon Sep 17 00:00:00 2001
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From: Felix Fietkau <nbd@nbd.name>
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Date: Sat, 15 Jul 2017 21:12:38 +0200
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Subject: kernel: move regmap bloat out of the kernel image if it is only being used in modules
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lede-commit: 96f39119815028073583e4fca3a9c5fe9141e998
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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drivers/base/regmap/Kconfig | 15 ++++++++++-----
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drivers/base/regmap/Makefile | 12 ++++++++----
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drivers/base/regmap/regmap.c | 3 +++
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include/linux/regmap.h | 2 +-
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4 files changed, 22 insertions(+), 10 deletions(-)
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--- a/drivers/base/regmap/Kconfig
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+++ b/drivers/base/regmap/Kconfig
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@@ -4,9 +4,8 @@
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# subsystems should select the appropriate symbols.
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config REGMAP
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- default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_SPMI || REGMAP_W1 || REGMAP_AC97 || REGMAP_MMIO || REGMAP_IRQ)
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select IRQ_DOMAIN if REGMAP_IRQ
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- bool
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+ tristate "Regmap"
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config REGCACHE_COMPRESSED
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select LZO_COMPRESS
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@@ -17,23 +16,30 @@ config REGMAP_AC97
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tristate
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config REGMAP_I2C
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- tristate
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+ tristate "Regmap I2C"
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+ select REGMAP
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depends on I2C
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config REGMAP_SPI
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- tristate
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+ tristate "Regmap SPI"
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+ select REGMAP
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+ depends on SPI_MASTER
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depends on SPI
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config REGMAP_SPMI
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+ select REGMAP
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tristate
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depends on SPMI
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config REGMAP_W1
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+ select REGMAP
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tristate
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depends on W1
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config REGMAP_MMIO
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- tristate
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+ tristate "Regmap MMIO"
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+ select REGMAP
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config REGMAP_IRQ
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+ select REGMAP
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bool
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--- a/drivers/base/regmap/Makefile
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+++ b/drivers/base/regmap/Makefile
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@@ -2,10 +2,14 @@
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# For include/trace/define_trace.h to include trace.h
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CFLAGS_regmap.o := -I$(src)
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-obj-$(CONFIG_REGMAP) += regmap.o regcache.o
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-obj-$(CONFIG_REGMAP) += regcache-rbtree.o regcache-flat.o
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-obj-$(CONFIG_REGCACHE_COMPRESSED) += regcache-lzo.o
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-obj-$(CONFIG_DEBUG_FS) += regmap-debugfs.o
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+regmap-core-objs = regmap.o regcache.o regcache-rbtree.o regcache-flat.o
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+ifdef CONFIG_DEBUG_FS
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+regmap-core-objs += regmap-debugfs.o
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+endif
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+ifdef CONFIG_REGCACHE_COMPRESSED
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+regmap-core-objs += regcache-lzo.o
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+endif
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+obj-$(CONFIG_REGMAP) += regmap-core.o
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obj-$(CONFIG_REGMAP_AC97) += regmap-ac97.o
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obj-$(CONFIG_REGMAP_I2C) += regmap-i2c.o
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obj-$(CONFIG_REGMAP_SPI) += regmap-spi.o
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--- a/drivers/base/regmap/regmap.c
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+++ b/drivers/base/regmap/regmap.c
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@@ -13,6 +13,7 @@
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/export.h>
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+#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/err.h>
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#include <linux/of.h>
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@@ -2926,3 +2927,5 @@ static int __init regmap_initcall(void)
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return 0;
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}
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postcore_initcall(regmap_initcall);
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+
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+MODULE_LICENSE("GPL");
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--- a/include/linux/regmap.h
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+++ b/include/linux/regmap.h
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@@ -139,7 +139,7 @@ struct reg_sequence {
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pollret ?: ((cond) ? 0 : -ETIMEDOUT); \
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})
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-#ifdef CONFIG_REGMAP
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+#if IS_REACHABLE(CONFIG_REGMAP)
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enum regmap_endian {
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/* Unspecified -> 0 -> Backwards compatible default */
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