linux-kernel - [PATCH] kbuild: Add KDEB_COMPRESS_LEVEL to control compression level

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-Id: <20250307150940.1309703-1-matt@readmodwrite.com>
Date: Fri,  7 Mar 2025 15:09:40 +0000
From: Matt Fleming <matt@...dmodwrite.com>
To: Masahiro Yamada <masahiroy@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nicolas Schier <nicolas@...sle.eu>
Cc: linux-kernel@...r.kernel.org,
	kernel-team@...udflare.com,
	Matt Fleming <mfleming@...udflare.com>
Subject: [PATCH] kbuild: Add KDEB_COMPRESS_LEVEL to control compression level

From: Matt Fleming <mfleming@...udflare.com>

Give users more control to tradeoff compression time vs compressed size
when building debian packages with a new KDEB_COMPRESS_LEVEL option.

Here are some examples of using KDEB_COMPRESS=xz with
KDEB_COMPRESS_LEVEL=1 through to KDEB_COMPRESS_LEVEL=6 with the
bindeb-pkg target:

  Level Time to compress Compressed size (bytes)
  ----- ---------------- -----------------------
      1        0m36.771s               476909176
      2        0m40.335s               474832644
      3        0m43.635s               473845600
      4        1m13.839s               472260012
      5        1m18.657s               464442676
      6        1m20.658s               464355000

Signed-off-by: Matt Fleming <mfleming@...udflare.com>
---
 scripts/package/debian/rules | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/package/debian/rules b/scripts/package/debian/rules
index ca07243bd5cd..616ecf1d4d1b 100755
--- a/scripts/package/debian/rules
+++ b/scripts/package/debian/rules
@@ -52,7 +52,7 @@ define binary
 	$(Q)dh_fixperms $(DH_OPTIONS)
 	$(Q)dh_gencontrol $(DH_OPTIONS) -- -f$(call mk-files,$@)
 	$(Q)dh_md5sums $(DH_OPTIONS)
-	$(Q)dh_builddeb $(DH_OPTIONS) -- $(addprefix -Z,$(KDEB_COMPRESS))
+	$(Q)dh_builddeb $(DH_OPTIONS) -- $(addprefix -Z,$(KDEB_COMPRESS)) $(addprefix -z,$(KDEB_COMPRESS_LEVEL))
 endef
 
 .PHONY: $(binary-targets)
-- 
2.34.1