Re: [PATCH] fix: Add toolchain fixes to linux-cip 4.4 kernel on Noble

["'Jan Kiszka' via isar-users" <isar-users@googlegroups.com>]

On 23.09.26 15:49, Moessbauer, Felix (FT RPD CED OES-DE) wrote:
> On Wed, 2026-09-23 at 14:03 +0200, Aleksey Laurynovich wrote:
>> Older kernel (4.4.x) has three toolchain issues on Ubuntu Noble:
>> - dtc yylloc multiple definition (fixed by HOSTCFLAGS+=-fcommon)
>> - ld rejects -Wl,-Bsymbolic-functions (fixed by clearing LDFLAGS)
>> - arm64 proc.S uses deprecated .section syntax rejected by binutils 2.42
>>   (fixed by patching to use modern 'ax' flags)
>>
>> The issue can be reproduced with the command:
>> $ bitbake mc:qemuarm64-noble:linux-cip-arm64
>>
>> Signed-off-by: Aleksey Laurynovich <alaur@ilbers.de>
>> ---
>>  ...rm64-proc.S-fix-binutils-2.42-section-syntax.patch | 11 +++++++++++
>>  .../recipes-kernel/linux/linux-cip_4.4.166-cip29.bb   |  6 ++++++
>>  2 files changed, 17 insertions(+)
>>  create mode 100644 meta-isar/recipes-kernel/linux/files/0001-arm64-proc.S-fix-binutils-2.42-section-syntax.patch
>>
>> diff --git a/meta-isar/recipes-kernel/linux/files/0001-arm64-proc.S-fix-binutils-2.42-section-syntax.patch b/meta-isar/recipes-kernel/linux/files/0001-arm64-proc.S-fix-binutils-2.42-section-syntax.patch
>> new file mode 100644
>> index 00000000..f464ac40
>> --- /dev/null
>> +++ b/meta-isar/recipes-kernel/linux/files/0001-arm64-proc.S-fix-binutils-2.42-section-syntax.patch
>> @@ -0,0 +1,11 @@
>> +--- a/arch/arm64/mm/proc.S
>> ++++ b/arch/arm64/mm/proc.S
>> +@@ -152,7 +152,7 @@
>> + alternative_endif
>> + ENDPROC(cpu_do_switch_mm)
>> + 
>> +-	.section ".text.init", #alloc, #execinstr
>> ++	.section ".text.init", "ax"
>> + 
>> + /*
>> +  *	__cpu_setup
>> diff --git a/meta-isar/recipes-kernel/linux/linux-cip_4.4.166-cip29.bb b/meta-isar/recipes-kernel/linux/linux-cip_4.4.166-cip29.bb
> 
> This kernel patch release is quite old. Did you check if v4.4.302-cip99
> is also affected?
> 

https://git.kernel.org/pub/scm/linux/kernel/git/cip/linux-cip.git/commit/?id=09490469cfb3b0855cf56badc62c512684d59570

And that although this is an unsupported configuration (arm64 support
got added to CIP with 4.19 only).

So, don't do that.

Jan

-- 
Siemens AG, Foundational Technologies
Linux Expert Center

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