On 3/4/25 2:26 PM, Christophe Leroy wrote:

Le 04/03/2025 à 07:13, Madhavan Srinivasan a écrit :

quoted

On 3/4/25 10:42 AM, Venkat Rao Bagalkote wrote:

quoted

Greetings!!


Observing build warnings with linux-next and powerpc repo's. Issue is currently not seen on mainline yet.

PPC Repo: 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.leroy2%40cs-soprasteria.com%7C8e0f8501f09c48dbb43608dd5ae3c9bf%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C638766656585342184%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=e5BrJzcrtlITkLF31KltGExQ5Qe8fDVTMV6VfR4w9o8%3D&reserved=0 merge branch

PPC Kernel Version: 6.14.0-rc4-g1304f486dbf1
next Repo: https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgit.kernel.org%2Fpub%2Fscm%2Flinux%2Fkernel%2Fgit%2Fnext%2Flinux-next.git&data=05%7C02%7Cchristophe.leroy2%40cs-soprasteria.com%7C8e0f8501f09c48dbb43608dd5ae3c9bf%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C638766656585355246%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=meQyZfB75HhJFCL6AX93slsyVwnogGPYFabDXl%2FLzDA%3D&reserved=0 master branch

next Kernel Version: 6.14.0-rc5-next-20250303


On linux-next kernel issue got introduced b/w next-20250227 and next-20250303


Build Warnings:

arch/powerpc/kvm/book3s_hv_rmhandlers.o: warning: objtool: .text+0xe84: intra_function_call not a direct call
arch/powerpc/crypto/ghashp8-ppc.o: warning: objtool: .text+0x22c: unannotated intra-function call
arch/powerpc/kernel/switch.o: warning: objtool: .text+0x4: intra_function_call not a direct call

Can you please specific the compiler and compiler version you found this issue with

Can you also tell which defconfig you are using or provide your .config

It might also be helpfull if you can provide a disassembly of the three file.o around the warned address.

I could recreate the issue with gcc 11.4.1 20231218 with today's linux-next (but could not recreate with gcc 14 or gcc 11.3.0)

(20d5c66e1810 (HEAD -> master, tag: next-20250304, origin/master, origin/HEAD) Add linux-next specific files for 20250304)

warning for one of the switch.S file :

  CC      arch/powerpc/kernel/syscalls.o
  AS      arch/powerpc/kernel/switch.o
arch/powerpc/kernel/switch.o: warning: objtool: .text+0x4: intra_function_call not a direct call
  CC      arch/powerpc/kernel/irq.o
  CC      arch/powerpc/kernel/align.o
  CC      arch/powerpc/kernel/signal_64.o

Objdump of switch.o:
arch/powerpc/kernel/switch.o:     file format elf64-powerpcle

Disassembly of section .text:

0000000000000000 <flush_branch_caches>:
       0:	a6 02 28 7d 	mflr    r9
       4:	05 00 00 48 	bl      8 <flush_branch_caches+0x8>
       8:	05 00 00 48 	bl      c <flush_branch_caches+0xc>
       c:	05 00 00 48 	bl      10 <flush_branch_caches+0x10>
      10:	05 00 00 48 	bl      14 <flush_branch_caches+0x14>
      14:	05 00 00 48 	bl      18 <flush_branch_caches+0x18>
      18:	05 00 00 48 	bl      1c <flush_branch_caches+0x1c>
      1c:	05 00 00 48 	bl      20 <flush_branch_caches+0x20>
      20:	05 00 00 48 	bl      24 <flush_branch_caches+0x24>
      24:	05 00 00 48 	bl      28 <flush_branch_caches+0x28>
      28:	05 00 00 48 	bl      2c <flush_branch_caches+0x2c>


arch/powerpc/kernel/switch.S failing src section:

.balign 32
.global flush_branch_caches
flush_branch_caches:
        /* Save LR into r9 */
        mflr    r9

        // Flush the link stack
        .rept 64
        ANNOTATE_INTRA_FUNCTION_CALL
        bl      .+4
        .endr
        b       1f
        nops    6

Maddy 

Christophe