tools perf: Do not check spaces/blank lines when checking header file copy drift

Commit-ID:  470de0f39e901611c366fc3d584307ba5d13406a
Gitweb:     http://git.kernel.org/tip/470de0f39e901611c366fc3d584307ba5d13406a
Author:     Arnaldo Carvalho de Melo <[email protected]>
AuthorDate: Mon, 31 Jul 2017 22:55:12 -0300
Committer:  Arnaldo Carvalho de Melo <[email protected]>
CommitDate: Mon, 31 Jul 2017 23:04:59 -0300

tools perf: Do not check spaces/blank lines when checking header file copy drift

We copy headers from include/, arch/ to allow tools/ use defines, structs from newer kernels and still be able to build on older systems.

We then, as part of a build, check if those copies got out of sync, when we emit a warning, so that we can check if something needs to be reflected on the tools, e.g. a 'perf trace' syscall argument beautifier needs tweaking.

But we don't have to be super strict with that, for instance, extra spaces, tabs or blank lines aren't problematic, so change check-headers.sh to have "--ignore-blank-lines --ignore-space-change" as default "diff" arguments.

---
 tools/perf/check-headers.sh | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

index ff0a5fa..3f0c657 100755
@@ -37,7 +37,7 @@ include/uapi/asm-generic/mman-common.h
 
 check () {
   file=$1
-  opts=
+  opts="--ignore-blank-lines --ignore-space-change"
 
   shift
   while [ -n "$*" ]; do

@@ -58,7 +58,7 @@ for i in $HEADERS; do
 done
 
 # diff with extra ignore lines
-check arch/x86/lib/memcpy_64.S        -B -I "^EXPORT_SYMBOL" -I "^#include <asm/export.h>"
-check arch/x86/lib/memset_64.S        -B -I "^EXPORT_SYMBOL" -I "^#include <asm/export.h>"
-check include/uapi/asm-generic/mman.h -B -I "^#include <\(uapi/\)*asm-generic/mman-common.h>"
-check include/uapi/linux/mman.h       -B -I "^#include <\(uapi/\)*asm/mman.h>"
+check arch/x86/lib/memcpy_64.S        -I "^EXPORT_SYMBOL" -I "^#include <asm/export.h>"
+check arch/x86/lib/memset_64.S        -I "^EXPORT_SYMBOL" -I "^#include <asm/export.h>"
+check include/uapi/asm-generic/mman.h -I "^#include <\(uapi/\)*asm-generic/mman-common.h>"
+check include/uapi/linux/mman.h       -I "^#include <\(uapi/\)*asm/mman.h>"