perf build: Remove PERF_HAVE_DWARF_REGS

PERF_HAVE_DWARF_REGS was true when an architecture had a dwarf-regs.c
file. There are no more architecture dwarf-regs.c files, selection is
done using constants from the ELF file rather than conditional
compilation. When removing PERF_HAVE_DWARF_REGS was the only variable
in the Makefile, remove the Makefile.

Add missing SPDX for RISC-V Makefile.

Reviewed-by: Masami Hiramatsu (Google) <[email protected]>
Signed-off-by: Ian Rogers <[email protected]>
Cc: Anup Patel <[email protected]>
Cc: Yang Jihong <[email protected]>
Cc: Palmer Dabbelt <[email protected]>
Cc: David S. Miller <[email protected]>
Cc: Albert Ou <[email protected]>
Cc: Shenlin Liang <[email protected]>
Cc: Nick Terrell <[email protected]>
Cc: Guilherme Amadio <[email protected]>
Cc: Steinar H. Gunderson <[email protected]>
Cc: Changbin Du <[email protected]>
Cc: Alexander Lobakin <[email protected]>
Cc: Przemek Kitszel <[email protected]>
Cc: Huacai Chen <[email protected]>
Cc: Guo Ren <[email protected]>
Cc: Masahiro Yamada <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: James Clark <[email protected]>
Cc: Mike Leach <[email protected]>
Cc: Chen Pei <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: Oliver Upton <[email protected]>
Cc: Aditya Gupta <[email protected]>
Cc: Kajol Jain <[email protected]>
Cc: Athira Rajeev <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: Bibo Mao <[email protected]>
Cc: John Garry <[email protected]>
Cc: Atish Patra <[email protected]>
Cc: Dima Kogan <[email protected]>
Cc: Paul Walmsley <[email protected]>
Cc: Dr. David Alan Gilbert <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Namhyung Kim <[email protected]>

Author: captain5050

tools/perf/Makefile.config

@@ -559,15 +559,10 @@ ifndef NO_LIBELF
   endif
 
   ifndef NO_LIBDW
-    ifeq ($(origin PERF_HAVE_DWARF_REGS), undefined)
-      $(warning DWARF register mappings have not been defined for architecture $(SRCARCH), DWARF support disabled)
-      NO_LIBDW := 1
-    else
-      CFLAGS += -DHAVE_LIBDW_SUPPORT $(LIBDW_CFLAGS)
-      LDFLAGS += $(LIBDW_LDFLAGS)
-      EXTLIBS += ${DWARFLIBS}
-      $(call detected,CONFIG_LIBDW)
-    endif # PERF_HAVE_DWARF_REGS
+    CFLAGS += -DHAVE_LIBDW_SUPPORT $(LIBDW_CFLAGS)
+    LDFLAGS += $(LIBDW_LDFLAGS)
+    EXTLIBS += ${DWARFLIBS}
+    $(call detected,CONFIG_LIBDW)
   endif # NO_LIBDW
 
   ifndef NO_LIBBPF

tools/perf/arch/arm/Makefile

@@ -1,5 +1,2 @@
 # SPDX-License-Identifier: GPL-2.0-only
-ifndef NO_LIBDW
-PERF_HAVE_DWARF_REGS := 1
-endif
 PERF_HAVE_JITDUMP := 1

tools/perf/arch/arm64/Makefile

@@ -1,7 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0
-ifndef NO_LIBDW
-PERF_HAVE_DWARF_REGS := 1
-endif
 PERF_HAVE_JITDUMP := 1
 HAVE_KVM_STAT_SUPPORT := 1
 

tools/perf/arch/csky/Makefile

@@ -1,7 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0
-ifndef NO_LIBDW
-PERF_HAVE_DWARF_REGS := 1
-endif
 PERF_HAVE_JITDUMP := 1
 HAVE_KVM_STAT_SUPPORT := 1
 

tools/perf/arch/loongarch/Makefile

@@ -1,8 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0
-ifndef NO_LIBDW
-PERF_HAVE_DWARF_REGS := 1
-endif
-
 # Syscall table generation for perf
 out    := $(OUTPUT)arch/mips/include/generated/asm
 header := $(out)/syscalls_n64.c

tools/perf/arch/mips/Makefile

@@ -1,8 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0
-ifndef NO_LIBDW
-PERF_HAVE_DWARF_REGS := 1
-endif
-
 HAVE_KVM_STAT_SUPPORT := 1
 PERF_HAVE_JITDUMP := 1
 

tools/perf/arch/powerpc/Makefile

@@ -1,6 +1,4 @@
-ifndef NO_LIBDW
-PERF_HAVE_DWARF_REGS := 1
-endif
+# SPDX-License-Identifier: GPL-2.0
 PERF_HAVE_JITDUMP := 1
 HAVE_KVM_STAT_SUPPORT := 1
 

tools/perf/arch/riscv/Makefile

@@ -1,7 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0-only
-ifndef NO_LIBDW
-PERF_HAVE_DWARF_REGS := 1
-endif
 HAVE_KVM_STAT_SUPPORT := 1
 PERF_HAVE_JITDUMP := 1
 

tools/perf/arch/s390/Makefile

@@ -1,6 +1,2 @@
 # SPDX-License-Identifier: GPL-2.0-only
-ifndef NO_LIBDW
-PERF_HAVE_DWARF_REGS := 1
-endif
-
 PERF_HAVE_JITDUMP := 1

tools/perf/arch/sh/Makefile

@@ -1,7 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0
-ifndef NO_LIBDW
-PERF_HAVE_DWARF_REGS := 1
-endif
 HAVE_KVM_STAT_SUPPORT := 1
 PERF_HAVE_JITDUMP := 1