linux-kernel - Re: [PATCH] powerpc/vdso: Provide clock_getres

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Message-ID: <19755142-0f2a-4cdb-a746-50ff06e297a0@kernel.org>
Date: Thu, 22 Jan 2026 11:49:09 +0100
From: "Christophe Leroy (CS GROUP)" <chleroy@...nel.org>
To: Thomas Weißschuh <thomas.weissschuh@...utronix.de>,
 "Sverdlin, Alexander" <alexander.sverdlin@...mens.com>
Cc: "npiggin@...il.com" <npiggin@...il.com>, "luto@...nel.org"
 <luto@...nel.org>, "maddy@...ux.ibm.com" <maddy@...ux.ibm.com>,
 "tglx@...nel.org" <tglx@...nel.org>, "mpe@...erman.id.au"
 <mpe@...erman.id.au>, "vincenzo.frascino@....com"
 <vincenzo.frascino@....com>,
 "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] powerpc/vdso: Provide clock_getres_time64()

Hi Again,

Le 22/01/2026 à 11:27, Christophe Leroy (CS GROUP) a écrit :
> Hi Thomas,
> 
> Le 22/01/2026 à 10:50, Thomas Weißschuh a écrit :
>> Hi Alexander,
>> Could you also share your configuration?
> 
> I've just been able to reproduce it with ppc64_defconfig + 
> CONFIG_CC_OPTIMIZE_FOR_SIZE
> 
>    VDSO32L arch/powerpc/kernel/vdso/vdso32.so.dbg
> arch/powerpc/kernel/vdso/vdso32.so.dbg: dynamic relocations are not 
> supported
> make[2]: *** [arch/powerpc/kernel/vdso/Makefile:79: arch/powerpc/kernel/ 
> vdso/vdso32.so.dbg] Error 1
> make[1]: *** [arch/powerpc/Makefile:388: vdso_prepare] Error 2
> make: *** [Makefile:248: __sub-make] Error 2
> 

Comes from here, a call to memset():

000007c0 <__c_kernel_clock_getres>:
  7c0:   94 21 ff d0     stwu    r1,-48(r1)
  7c4:   7c 08 02 a6     mflr    r0
  7c8:   bf a1 00 24     stmw    r29,36(r1)
  7cc:   7c 7e 1b 78     mr      r30,r3
  7d0:   7c bd 2b 78     mr      r29,r5
  7d4:   7c 9f 23 78     mr      r31,r4
  7d8:   38 a0 00 10     li      r5,16
  7dc:   90 01 00 34     stw     r0,52(r1)
  7e0:   38 80 00 00     li      r4,0
  7e4:   38 61 00 08     addi    r3,r1,8
  7e8:   48 00 00 01     bl      7e8 <__c_kernel_clock_getres+0x28>
                         7e8: R_PPC_REL24        memset
  7ec:   7f c4 f3 78     mr      r4,r30
  7f0:   7f a3 eb 78     mr      r3,r29
  7f4:   38 a1 00 08     addi    r5,r1,8
  7f8:   4b ff f8 09     bl      0 <__cvdso_clock_getres_common>
  7fc:   2c 03 00 00     cmpwi   r3,0
  800:   40 82 00 24     bne     824 <__c_kernel_clock_getres+0x64>
  804:   38 00 00 f7     li      r0,247
  808:   7f c3 f3 78     mr      r3,r30
  80c:   7f e4 fb 78     mr      r4,r31
  810:   44 00 00 02     sc
  814:   40 e3 00 08     bns+    81c <__c_kernel_clock_getres+0x5c>
  818:   7c 63 00 d0     neg     r3,r3
  81c:   39 61 00 30     addi    r11,r1,48
  820:   48 00 00 00     b       820 <__c_kernel_clock_getres+0x60>
                         820: R_PPC_REL24        _restgpr_29_x
  824:   2c 1f 00 00     cmpwi   r31,0
  828:   41 82 00 14     beq     83c <__c_kernel_clock_getres+0x7c>
  82c:   81 21 00 0c     lwz     r9,12(r1)
  830:   91 3f 00 00     stw     r9,0(r31)
  834:   81 21 00 14     lwz     r9,20(r1)
  838:   91 3f 00 04     stw     r9,4(r31)
  83c:   38 60 00 00     li      r3,0
  840:   4b ff ff dc     b       81c <__c_kernel_clock_getres+0x5c>