[PATCH v2 8/8] powerpc: Enable Generic Entry/Exit for syscalls.

[Christophe Leroy (CS GROUP)]

Le 16/12/2025 à 16:08, Mukesh Kumar Chaurasiya a écrit :
> On Tue, Dec 16, 2025 at 04:27:55AM +0800, kernel test robot wrote:
>> Hi Mukesh,
>>
>> kernel test robot noticed the following build errors:
>>
>> [auto build test ERROR on powerpc/next]
>> [also build test ERROR on powerpc/fixes linus/master v6.19-rc1 next-20251215]
>> [If your patch is applied to the wrong git tree, kindly drop us a note.
>> And when submitting patch, we suggest to use '--base' as documented in
>> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgit-scm.com%2Fdocs%2Fgit-format-patch%23_base_tree_information&data=05%7C02%7Cchristophe.leroy%40csgroup.eu%7C181ba96509e54904228908de3cb4fa09%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C639014945174972177%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=4sU795uiAIkzbbf9cdzEUNH6Cbax3kPS7biPFWiZir4%3D&reserved=0]
>>
>> url:    https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fintel-lab-lkp%2Flinux%2Fcommits%2FMukesh-Kumar-Chaurasiya%2Fpowerpc-rename-arch_irq_disabled_regs%2F20251214-210813&data=05%7C02%7Cchristophe.leroy%40csgroup.eu%7C181ba96509e54904228908de3cb4fa09%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C639014945174996572%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=BalspVN%2FJmi2pKv2QsOwMPsPOzLF%2FGAfSJ4Pq1jn%2BeM%3D&reserved=0
>> base:   https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgit.kernel.org%2Fpub%2Fscm%2Flinux%2Fkernel%2Fgit%2Fpowerpc%2Flinux.git&data=05%7C02%7Cchristophe.leroy%40csgroup.eu%7C181ba96509e54904228908de3cb4fa09%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C639014945175289139%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=IExs1jOXw207ewNfCHIbLYmCeYTPGr65giviQ842JnA%3D&reserved=0 next
>> patch link:    https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.kernel.org%2Fr%2F20251214130245.43664-9-mkchauras%2540linux.ibm.com&data=05%7C02%7Cchristophe.leroy%40csgroup.eu%7C181ba96509e54904228908de3cb4fa09%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C639014945175311233%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=CJQevooFK2LY06NmPMpnyki3UfYOsIiFv1FThGk4CEI%3D&reserved=0
>> patch subject: [PATCH v2 8/8] powerpc: Enable Generic Entry/Exit for syscalls.
>> config: powerpc-randconfig-001-20251215 (https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdownload.01.org%2F0day-ci%2Farchive%2F20251216%2F202512160453.iO9WNjrm-lkp%40intel.com%2Fconfig&data=05%7C02%7Cchristophe.leroy%40csgroup.eu%7C181ba96509e54904228908de3cb4fa09%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C639014945175328057%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=fM7XuG4aUtdsKuVZCjXZazYE%2FLU5uhqtXOTsiHQgEz0%3D&reserved=0)
>> compiler: powerpc-linux-gcc (GCC) 9.5.0
>> reproduce (this is a W=1 build): (https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdownload.01.org%2F0day-ci%2Farchive%2F20251216%2F202512160453.iO9WNjrm-lkp%40intel.com%2Freproduce&data=05%7C02%7Cchristophe.leroy%40csgroup.eu%7C181ba96509e54904228908de3cb4fa09%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C639014945175343707%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=pnqJzh3vwyq8XCtopm%2ByJm0zUpz1Bk5JzVork9mZyec%3D&reserved=0)
>>
>> If you fix the issue in a separate patch/commit (i.e. not just a new version of
>> the same patch/commit), kindly add following tags
>> | Reported-by: kernel test robot <lkp at intel.com>
>> | Closes: https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.kernel.org%2Foe-kbuild-all%2F202512160453.iO9WNjrm-lkp%40intel.com%2F&data=05%7C02%7Cchristophe.leroy%40csgroup.eu%7C181ba96509e54904228908de3cb4fa09%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C639014945175359094%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=5ToZM5JVO5d4NhuwFJjg78Xv%2F5nmxX8ZUhfmCNDo2hg%3D&reserved=0
>>
> I tried this with gcc 9.4 and gcc 14. I am not able to reproduce this.
> Will investigate further, meanwhile if anyone has any ideas that can help it would be great.

I was able to reproduce it with gcc 9.5

Seems to be related to commit 69d4c0d32186 ("entry, kasan, x86: Disallow 
overriding mem*() functions")

Which is in contradiction with commit 26deb04342e3 ("powerpc: prepare 
string/mem functions for KASAN")

Christophe