diff --git a/Makefile b/Makefile
index 1e9c925f4a..17b4940568 100644
--- a/Makefile
+++ b/Makefile
@@ -1306,6 +1306,29 @@ SPATCH_TEST_FLAGS =
 # COMPUTE_HEADER_DEPENDENCIES=no this will be unset too.
 SPATCH_USE_O_DEPENDENCIES = YesPlease
 
+# Set SPATCH_CONCAT_COCCI to concatenate the contrib/cocci/*.cocci
+# files into a single contrib/cocci/ALL.cocci before running
+# "coccicheck".
+#
+# Pros:
+#
+# - Speeds up a one-shot run of "make coccicheck", as we won't have to
+#   parse *.[ch] files N times for the N *.cocci rules
+#
+# Cons:
+#
+# - Will make incremental development of *.cocci slower, as
+#   e.g. changing strbuf.cocci will re-run all *.cocci.
+#
+# - Makes error and performance analysis harder, as rules will be
+#   applied from a monolithic ALL.cocci, rather than
+#   e.g. strbuf.cocci. To work around this either undefine this, or
+#   generate a specific patch, e.g. this will always use strbuf.cocci,
+#   not ALL.cocci:
+#
+#	make contrib/coccinelle/strbuf.cocci.patch
+SPATCH_CONCAT_COCCI = YesPlease
+
 # Rebuild 'coccicheck' if $(SPATCH), its flags etc. change
 TRACK_SPATCH_DEFINES =
 TRACK_SPATCH_DEFINES += $(SPATCH)
@@ -3158,9 +3181,12 @@ check: $(GENERATED_H)
 		exit 1; \
 	fi
 
+COCCI_GEN_ALL = .build/contrib/coccinelle/ALL.cocci
 COCCI_GLOB = $(wildcard contrib/coccinelle/*.cocci)
 COCCI_RULES_TRACKED = $(COCCI_GLOB:%=.build/%)
+COCCI_RULES_TRACKED_NO_PENDING = $(filter-out %.pending.cocci,$(COCCI_RULES_TRACKED))
 COCCI_RULES =
+COCCI_RULES += $(COCCI_GEN_ALL)
 COCCI_RULES += $(COCCI_RULES_TRACKED)
 COCCI_NAMES =
 COCCI_NAMES += $(COCCI_RULES:.build/contrib/coccinelle/%.cocci=%)
@@ -3195,6 +3221,10 @@ $(COCCI_RULES_TRACKED): .build/% : %
 	$(call mkdir_p_parent_template)
 	$(QUIET_GEN) >$@
 
+$(COCCI_GEN_ALL): $(COCCI_RULES_TRACKED_NO_PENDING)
+	$(call mkdir_p_parent_template)
+	$(QUIET_SPATCH_CAT)cat $^ >$@
+
 ifeq ($(COMPUTE_HEADER_DEPENDENCIES),no)
 SPATCH_USE_O_DEPENDENCIES =
 endif
@@ -3251,7 +3281,11 @@ COCCI_TEST_RES_GEN = $(addprefix .build/,$(COCCI_TEST_RES))
 $(COCCI_TEST_RES_GEN): GIT-SPATCH-DEFINES
 $(COCCI_TEST_RES_GEN): .build/%.res : %.c
 $(COCCI_TEST_RES_GEN): .build/%.res : %.res
+ifdef SPATCH_CONCAT_COCCI
+$(COCCI_TEST_RES_GEN): .build/contrib/coccinelle/tests/%.res : $(COCCI_GEN_ALL)
+else
 $(COCCI_TEST_RES_GEN): .build/contrib/coccinelle/tests/%.res : contrib/coccinelle/%.cocci
+endif
 	$(call mkdir_p_parent_template)
 	$(QUIET_SPATCH_TEST)$(SPATCH) $(SPATCH_TEST_FLAGS) \
 		--very-quiet --no-show-diff \
@@ -3264,7 +3298,11 @@ $(COCCI_TEST_RES_GEN): .build/contrib/coccinelle/tests/%.res : contrib/coccinell
 coccicheck-test: $(COCCI_TEST_RES_GEN)
 
 coccicheck: coccicheck-test
+ifdef SPATCH_CONCAT_COCCI
+coccicheck: contrib/coccinelle/ALL.cocci.patch
+else
 coccicheck: $(COCCICHECK_PATCHES_INTREE)
+endif
 
 # See contrib/coccinelle/README
 coccicheck-pending: coccicheck-test
diff --git a/contrib/coccinelle/README b/contrib/coccinelle/README
index 09ea8298e1..09b72bfd4e 100644
--- a/contrib/coccinelle/README
+++ b/contrib/coccinelle/README
@@ -57,3 +57,16 @@ Git-specific tips & things to know about how we run "spatch":
 
    To disable this behavior use the "SPATCH_USE_O_DEPENDENCIES=NoThanks"
    flag.
+
+ * To speed up our rules the "make coccicheck" target will by default
+   concatenate all of the *.cocci files here into an "ALL.cocci", and
+   apply it to each source file.
+
+   This makes the run faster, as we don't need to run each rule
+   against each source file. See the Makefile for further discussion,
+   this behavior can be disabled with "SPATCH_CONCAT_COCCI=".
+
+   But since they're concatenated any <id> in the <rulname> (e.g. "@
+   my_name", v.s. anonymous "@@") needs to be unique across all our
+   *.cocci files. You should only need to name rules if other rules
+   depend on them (currently only one rule is named).