PR32930 backends/: guard asm/perf_regs.h include

asm/perf_regs.h is an arch-specific linux include, not present on
architectures like hppa and m68k that lack perf_events support.

Only one place we need to fix; others already guard the include by
architecture, or use architecture-independent headers (e.g.
linux/perf_events.h).

* backends/libebl_PERF_FLAGS.h: Only include asm/perf_regs.h on
  architectures where we use it.

diff --git a/backends/libebl_PERF_FLAGS.h b/backends/libebl_PERF_FLAGS.h
index 2ed45f0fa40448e9a448b663b9e8b0af7a365b98..51c20ea682f0bc10e8ac8251731cb0a860b991b1 100644 (file)
--- a/backends/libebl_PERF_FLAGS.h
+++ b/backends/libebl_PERF_FLAGS.h
@@ -32,8 +32,12 @@
 #define _LIBEBL_PERF_FLAGS_H 1
 
 #if defined(__linux__)
+/* XXX Need to exclude __linux__ arches without perf_regs.h. */
+#if defined(__x86_64__) || defined(__i386__)
+/* || defined(other_architecture)... */
 # include <asm/perf_regs.h>
 #endif
+#endif
 
 #if defined(_ASM_X86_PERF_REGS_H)
 /* See the code in x86_initreg_sample.c for list of required regs and
@@ -49,8 +53,8 @@
    see the code in tools/perf/util/intel-pt.c intel_pt_add_gp_regs()
    and note how regs are added in the same order as the perf_regs.h enum.  */
 #else
-/* Since asm/perf_regs.h gives the register layout for a different arch,
-   we can't unwind x86_64 frames.  */
+/* Since asm/perf_regs.h is absent, or gives the register layout for a
+   different arch, we can't unwind i386 and x86_64 frames. */
 #define PERF_FRAME_REGISTERS_I386 0
 #define PERF_FRAME_REGISTERS_X86_64 0
 #endif