On Tue, Feb 28, 2023 at 08:22:01PM +0000, Carlos Llamas wrote:

On Tue, Feb 28, 2023 at 07:49:37PM +0100, gregkh@linuxfoundation.org wrote:

...

The patch below does not apply to the 5.10-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

Possible dependencies:

6ec363fc6142 ("scripts/tags.sh: fix incompatibility with PCRE2") 7394d2ebb651 ("scripts/tags.sh: Invoke 'realpath' via 'xargs'")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 6ec363fc6142226b9ab5a6528f65333d729d2b6b Mon Sep 17 00:00:00 2001 From: Carlos Llamas cmllamas@google.com Date: Wed, 15 Feb 2023 18:38:50 +0000 Subject: [PATCH] scripts/tags.sh: fix incompatibility with PCRE2

Starting with release 10.38 PCRE2 drops default support for using \K in lookaround patterns as described in [1]. Unfortunately, scripts/tags.sh relies on such functionality to collect all_compiled_soures() leading to the following error:

$ make COMPILED_SOURCE=1 tags GEN tags grep: \K is not allowed in lookarounds (but see PCRE2_EXTRA_ALLOW_LOOKAROUND_BSK)

The usage of \K for this pattern was introduced in commit 4f491bb6ea2a ("scripts/tags.sh: collect compiled source precisely") which speeds up the generation of tags significantly.

In order to fix this issue without compromising the performance we can switch over to an equivalent sed expression. The same matching pattern is preserved here except \K is replaced with a backreference \1.

[1] https://www.pcre.org/current/doc/html/pcre2syntax.html#SEC11

Cc: Greg Kroah-Hartman gregkh@linuxfoundation.org Cc: Cristian Ciocaltea cristian.ciocaltea@collabora.com Cc: Masahiro Yamada masahiroy@kernel.org Cc: Jialu Xu xujialu@vimux.org Cc: Vipin Sharma vipinsh@google.com Cc: stable@vger.kernel.org Fixes: 4f491bb6ea2a ("scripts/tags.sh: collect compiled source precisely") Signed-off-by: Carlos Llamas cmllamas@google.com Link: https://lore.kernel.org/r/20230215183850.3353198-1-cmllamas@google.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

diff --git a/scripts/tags.sh b/scripts/tags.sh index 1ad45f17179a..6b9001853890 100755 --- a/scripts/tags.sh +++ b/scripts/tags.sh @@ -98,7 +98,7 @@ all_compiled_sources() { echo include/generated/autoconf.h find $ignore -name "*.cmd" -exec \

• 	grep -Poh '(?(?=^source_.* \K).*|(?=^  \K\S).*(?= \\))' {} \+ |
  

• 	sed -n -E 's/^source_.* (.*)/\1/p; s/^  (\S.*) \\/\1/p' {} \+ |
  

  awk '!a[$0]++' } | xargs realpath -esq $([ -z "$KBUILD_ABS_SRCTREE" ] && echo --relative-to=.) | sort -u

Hi Greg,

This patch would be needed in 5.10+ branches. Instead of backporting it, I think is better to pick the "xargs" fix too. So can you please take the following two commits for 5.10 and 5.15? I've verified they both apply and work as expected with new PCRE2.

7394d2ebb651 ("scripts/tags.sh: Invoke 'realpath' via 'xargs'") 6ec363fc6142 ("scripts/tags.sh: fix incompatibility with PCRE2")

Good idea, now queued up, thanks!

greg k-h