linux-kernel - Re: Odd build breakage in 4.9-rc7

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Date:   Thu, 01 Dec 2016 21:15:31 +0100
From:   Paul Bolle <pebolle@...cali.nl>
To:     Nicolas Pitre <nicolas.pitre@...aro.org>
Cc:     Jarod Wilson <jarod@...hat.com>, Tony Luck <tony.luck@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Prarit Bhargava <prarit@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: Re: Odd build breakage in 4.9-rc7

On Thu, 2016-12-01 at 12:42 -0500, Nicolas Pitre wrote:
> OK I understand what the problem is.  However most of those hunks below 
> are definitely wrong. ;-)

Probably. By now I've narrowed it down to just these two hunks:

diff --git a/scripts/Makefile b/scripts/Makefile
index 1d80897a9644..f23e5c4f2496 100644
--- a/scripts/Makefile
+++ b/scripts/Makefile
@@ -40,7 +40,9 @@ build_docproc: $(obj)/docproc
 build_check-lc_ctype: $(obj)/check-lc_ctype
 	@:
 
-subdir-$(CONFIG_MODVERSIONS) += genksyms
+ifeq ($(or $(CONFIG_MODVERSIONS),$(CONFIG_TRIM_UNUSED_KSYMS)),y)
+subdir-y                     += genksyms
+endif
 subdir-y                     += mod
 subdir-$(CONFIG_SECURITY_SELINUX) += selinux
 subdir-$(CONFIG_DTC)         += dtc
diff --git a/scripts/adjust_autoksyms.sh b/scripts/adjust_autoksyms.sh
index 8dc1918b6783..7525da1cc2f7 100755
--- a/scripts/adjust_autoksyms.sh
+++ b/scripts/adjust_autoksyms.sh
@@ -68,7 +68,7 @@ while read sym; do
 done >> "$new_ksyms_file"
 
 # Special case for modversions (see modpost.c)
-if [ -n "$CONFIG_MODVERSIONS" ]; then
+if [ -n "$CONFIG_MODVERSIONS" -o -n "$CONFIG_TRIM_UNUSED_KSYMS" ]; then
 	echo "#define __KSYM_module_layout 1" >> "$new_ksyms_file"
 fi
 

> I'm trying to determine the best way to fix it. Stay tuned.

Will do. I'm curious to see what a proper fix might look like.

Thanks,


Paul Bolle