ACPI: tables: Add custom DSDT file as makefile prerequisite

rfvirgil · rafaeljw · commit d1059c1b1146 · 2021-06-23T19:31:50.000+02:00
A custom DSDT file is mostly used during development or debugging,
and in that case it is quite likely to want to rebuild the kernel
after changing ONLY the content of the DSDT.

This patch adds the custom DSDT as a prerequisite to tables.o
to ensure a rebuild if the DSDT file is updated. Make will merge
the prerequisites from multiple rules for the same target.

Signed-off-by: Richard Fitzgerald &lt;rf@opensource.cirrus.com&gt;
Signed-off-by: Rafael J. Wysocki &lt;rafael.j.wysocki@intel.com&gt;
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
@@ -8,6 +8,11 @@ ccflags-$(CONFIG_ACPI_DEBUG)	+= -DACPI_DEBUG_OUTPUT
 #
 # ACPI Boot-Time Table Parsing
 #
+ifeq ($(CONFIG_ACPI_CUSTOM_DSDT),y)
+tables.o: $(src)/../../include/$(subst $\",,$(CONFIG_ACPI_CUSTOM_DSDT_FILE)) ;
+
+endif
+
 obj-$(CONFIG_ACPI)		+= tables.o
 obj-$(CONFIG_X86)		+= blacklist.o
 

Original file line number	Diff line number	Diff line change
`@@ -8,6 +8,11 @@ ccflags-$(CONFIG_ACPI_DEBUG) += -DACPI_DEBUG_OUTPUT`
`8`	`8`	`#`
`9`	`9`	`# ACPI Boot-Time Table Parsing`
`10`	`10`	`#`
	`11`	`+ifeq ($(CONFIG_ACPI_CUSTOM_DSDT),y)`
	`12`	`+tables.o: $(src)/../../include/$(subst $\",,$(CONFIG_ACPI_CUSTOM_DSDT_FILE)) ;`
	`13`	`+`
	`14`	`+endif`
	`15`	`+`
`11`	`16`	`obj-$(CONFIG_ACPI) += tables.o`
`12`	`17`	`obj-$(CONFIG_X86) += blacklist.o`
`13`	`18`