spi: omap2-mcspi: fix blatant abuse of the resource subsystem

[karo-tx-linux.git] / Makefile

diff --git a/Makefile b/Makefile
index b11e2d504a00642c40e39d4b7de059372032ca32..b89ca7023b760ed2d181794e74d037a646407218 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -354,9 +354,14 @@ include $(srctree)/scripts/Kbuild.include
 # Make variables (CC, etc...)
 AS             = $(CROSS_COMPILE)as
 LD             = $(CROSS_COMPILE)ld
+LDFINAL        = $(LD)
 CC             = $(CROSS_COMPILE)gcc
 CPP            = $(CC) -E
+ifdef CONFIG_LTO
+AR             = $(CROSS_COMPILE)gcc-ar
+else
 AR             = $(CROSS_COMPILE)ar
+endif
 NM             = $(CROSS_COMPILE)nm
 STRIP          = $(CROSS_COMPILE)strip
 OBJCOPY                = $(CROSS_COMPILE)objcopy
@@ -415,7 +420,7 @@ KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(S
 
 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
-export CPP AR NM STRIP OBJCOPY OBJDUMP
+export CPP AR NM STRIP OBJCOPY OBJDUMP LDFINAL
 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 
@@ -426,6 +431,17 @@ export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 export KBUILD_ARFLAGS
 
+ifdef CONFIG_LTO
+# LTO gcc creates a lot of files in TMPDIR, and with /tmp as tmpfs
+# it's easy to drive the machine OOM. Use the object directory
+# instead.
+ifndef TMPDIR
+TMPDIR ?= $(objtree)
+export TMPDIR
+$(info setting TMPDIR=$(objtree) for LTO build)
+endif
+endif
+
 # When compiling out-of-tree modules, put MODVERDIR in the module
 # tree rather than in the kernel tree. The kernel tree might
 # even be read-only.
@@ -615,6 +631,9 @@ else
 KBUILD_CFLAGS  += -O2
 endif
 
+# Tell gcc to never replace conditional load with a non-conditional one
+KBUILD_CFLAGS  += $(call cc-option,--param=allow-store-data-races=0)
+
 ifdef CONFIG_READABLE_ASM
 # Disable optimizations that make assembler listings hard to read.
 # reorder blocks reorders the control in the function
@@ -745,6 +764,7 @@ ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
 endif
 
 include $(srctree)/scripts/Makefile.extrawarn
+include ${srctree}/scripts/Makefile.lto
 
 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
 KBUILD_CPPFLAGS += $(KCPPFLAGS)