###
# Main build makefile.
#
#  Lots of this code have been borrowed or heavily inspired from parts
#  of kbuild code, which is not credited, but mostly developed by:
#
#  Copyright (C) Sam Ravnborg <sam@mars.ravnborg.org>, 2015
#  Copyright (C) Linus Torvalds <torvalds@linux-foundation.org>, 2015
#

PHONY := __build
__build:

ifeq ($(V),1)
  quiet =
  Q =
else
  quiet=quiet_
  Q=@
endif

build-dir := $(srctree)/tools/build

# Define $(fixdep) for dep-cmd function
ifeq ($(OUTPUT),)
  fixdep := $(build-dir)/fixdep
else
  fixdep := $(OUTPUT)/fixdep
endif

# Generic definitions
include $(build-dir)/Build.include

# do not force detected configuration
-include $(OUTPUT).config-detected

# Init all relevant variables used in build files so
# 1) they have correct type
# 2) they do not inherit any value from the environment
subdir-y     :=
obj-y        :=
subdir-y     :=
subdir-obj-y :=

# Build definitions
build-file := $(dir)/Build
-include $(build-file)

quiet_cmd_flex  = FLEX     $@
quiet_cmd_bison = BISON    $@

# Create directory unless it exists
quiet_cmd_mkdir = MKDIR    $(dir $@)
      cmd_mkdir = mkdir -p $(dir $@)
     rule_mkdir = $(if $(wildcard $(dir $@)),,@$(call echo-cmd,mkdir) $(cmd_mkdir))

# Compile command
quiet_cmd_cc_o_c = CC       $@
      cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<

quiet_cmd_host_cc_o_c = HOSTCC   $@
      cmd_host_cc_o_c = $(HOSTCC) $(host_c_flags) -c -o $@ $<

quiet_cmd_cxx_o_c = CXX      $@
      cmd_cxx_o_c = $(CXX) $(cxx_flags) -c -o $@ $<

quiet_cmd_cpp_i_c = CPP      $@
      cmd_cpp_i_c = $(CC) $(c_flags) -E -o $@ $<

quiet_cmd_cc_s_c = AS       $@
      cmd_cc_s_c = $(CC) $(c_flags) -S -o $@ $<

quiet_cmd_gen = GEN      $@

# Link agregate command
# If there's nothing to link, create empty $@ object.
quiet_cmd_ld_multi = LD       $@
      cmd_ld_multi = $(if $(strip $(obj-y)),\
                     $(LD) -r -o $@  $(filter $(obj-y),$^),rm -f $@; $(AR) rcs $@)

quiet_cmd_host_ld_multi = HOSTLD   $@
      cmd_host_ld_multi = $(if $(strip $(obj-y)),\
                          $(HOSTLD) -r -o $@  $(filter $(obj-y),$^),rm -f $@; $(HOSTAR) rcs $@)

ifneq ($(filter $(obj),$(hostprogs)),)
  host = host_
endif

# Build rules
$(OUTPUT)%.o: %.c FORCE
	$(call rule_mkdir)
	$(call if_changed_dep,$(host)cc_o_c)

$(OUTPUT)%.o: %.cpp FORCE
	$(call rule_mkdir)
	$(call if_changed_dep,cxx_o_c)

$(OUTPUT)%.o: %.S FORCE
	$(call rule_mkdir)
	$(call if_changed_dep,$(host)cc_o_c)

$(OUTPUT)%.i: %.c FORCE
	$(call rule_mkdir)
	$(call if_changed_dep,cpp_i_c)

$(OUTPUT)%.s: %.S FORCE
	$(call rule_mkdir)
	$(call if_changed_dep,cpp_i_c)

$(OUTPUT)%.s: %.c FORCE
	$(call rule_mkdir)
	$(call if_changed_dep,cc_s_c)

# Gather build data:
#   obj-y        - list of build objects
#   subdir-y     - list of directories to nest
#   subdir-obj-y - list of directories objects 'dir/$(obj)-in.o'
obj-y        := $($(obj)-y)
subdir-y     := $(patsubst %/,%,$(filter %/, $(obj-y)))
obj-y        := $(patsubst %/, %/$(obj)-in.o, $(obj-y))
subdir-obj-y := $(filter %/$(obj)-in.o, $(obj-y))

# '$(OUTPUT)/dir' prefix to all objects
objprefix    := $(subst ./,,$(OUTPUT)$(dir)/)
obj-y        := $(addprefix $(objprefix),$(obj-y))
subdir-obj-y := $(addprefix $(objprefix),$(subdir-obj-y))

# Final '$(obj)-in.o' object
in-target := $(objprefix)$(obj)-in.o

PHONY += $(subdir-y)

$(subdir-y):
	$(Q)$(MAKE) -f $(build-dir)/Makefile.build dir=$(dir)/$@ obj=$(obj)

$(sort $(subdir-obj-y)): $(subdir-y) ;

$(in-target): $(obj-y) FORCE
	$(call rule_mkdir)
	$(call if_changed,$(host)ld_multi)

__build: $(in-target)
	@:

PHONY += FORCE
FORCE:

# Include all cmd files to get all the dependency rules
# for all objects included
targets   := $(wildcard $(sort $(obj-y) $(in-target) $(MAKECMDGOALS)))
cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))

ifneq ($(cmd_files),)
  include $(cmd_files)
endif

.PHONY: $(PHONY)
/select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Bjorn Helgaas &lt;bhelgaas@google.com&gt;</td><td class='right'>2017-01-27 15:00:45 -0600</td></tr>
<tr><th>committer</th><td>Bjorn Helgaas &lt;bhelgaas@google.com&gt;</td><td class='right'>2017-01-27 15:00:45 -0600</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/ipv4?id=030305d69fc6963c16003f50d7e8d74b02d0a143'>030305d69fc6963c16003f50d7e8d74b02d0a143</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/ipv4?id=030305d69fc6963c16003f50d7e8d74b02d0a143'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=030305d69fc6963c16003f50d7e8d74b02d0a143'>363a4e34d199178769b7e7eeb26ea2620a55847b</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/ipv4?id=030305d69fc6963c16003f50d7e8d74b02d0a143'>net/ipv4</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/ipv4?id=4d191b1b63c209e37bf27938ef365244d3c41084'>4d191b1b63c209e37bf27938ef365244d3c41084</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/ipv4?id=030305d69fc6963c16003f50d7e8d74b02d0a143&amp;id2=4d191b1b63c209e37bf27938ef365244d3c41084'>diff</a>)</td></tr></table>
<div class='commit-subject'>PCI/ASPM: Handle PCI-to-PCIe bridges as roots of PCIe hierarchies</div><div class='commit-msg'>In a struct pcie_link_state, link-&gt;root points to the pcie_link_state of
the root of the PCIe hierarchy.  For the topmost link, this points to
itself (link-&gt;root = link).  For others, we copy the pointer from the
parent (link-&gt;root = link-&gt;parent-&gt;root).

Previously we recognized that Root Ports originated PCIe hierarchies, but
we treated PCI/PCI-X to PCIe Bridges as being in the middle of the
hierarchy, and when we tried to copy the pointer from link-&gt;parent-&gt;root,
there was no parent, and we dereferenced a NULL pointer:

  BUG: unable to handle kernel NULL pointer dereference at 0000000000000090
  IP: [&lt;ffffffff9e424350&gt;] pcie_aspm_init_link_state+0x170/0x820

Recognize that PCI/PCI-X to PCIe Bridges originate PCIe hierarchies just
like Root Ports do, so link-&gt;root for these devices should also point to
itself.

Fixes: 51ebfc92b72b ("PCI: Enumerate switches below PCI-to-PCIe bridges")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=193411
Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1022181
Tested-by: lists@ssl-mail.com
Tested-by: Jayachandran C. &lt;jnair@caviumnetworks.com&gt;
Signed-off-by: Bjorn Helgaas &lt;bhelgaas@google.com&gt;
CC: stable@vger.kernel.org	# v4.2+</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=030305d69fc6963c16003f50d7e8d74b02d0a143'>Diffstat</a> (limited to 'net/ipv4')</div><table summary='diffstat' class='diffstat'>