linux-kernel - Re: [mainline]tools/perf build warnings

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Message-Id: <51BBBC12-9A42-4D72-BDBB-84879C940764@linux.ibm.com>
Date: Wed, 16 Apr 2025 20:04:14 +0530
From: Athira Rajeev <atrajeev@...ux.ibm.com>
To: Venkat Rao Bagalkote <venkat88@...ux.ibm.com>,
        Namhyung Kim <namhyung@...nel.org>,
        "open list:PERFORMANCE EVENTS SUBSYSTEM" <linux-perf-users@...r.kernel.org>
Cc: Madhavan Srinivasan <maddy@...ux.ibm.com>, Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>, jiang.peng9@....com.cn,
        shao.mingyin@....com.cn, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [mainline]tools/perf build warnings



> On 16 Apr 2025, at 7:49 PM, Venkat Rao Bagalkote <venkat88@...ux.ibm.com> wrote:
> 
> 
> On 16/04/25 7:33 pm, Venkat Rao Bagalkote wrote:
>> 
>> On 16/04/25 6:41 pm, Athira Rajeev wrote:
>>> 
>>>> On 16 Apr 2025, at 5:12 PM, Venkat Rao Bagalkote <venkat88@...ux.ibm.com> wrote:
>>>> 
>>>> Hello,
>>>> 
>>>> 
>>>> I am observing a new build warning on today mainline kernel, with head commit: g834a4a689699
>>>> 
>>>> Repo:https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>>>> 
>>>> 
>>>> Warnings:
>>>> 
>>>> diff -u tools/include/vdso/unaligned.h include/vdso/unaligned.h
>>>> 
>>>> 
>>>> If you happen to fix this, please add below tag.
>>>> 
>>>> 
>>>> Reported-by: Venkat Rao Bagalkote <venkat88@...ux.ibm.com>
>>> Hi Venkat
>>> 
>>> Can you please check with https://web.git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools-next.git/?h=tmp.perf-tools-next
>>> with the tmp.perf-tools-next branch..
>> 
>> 
>> I verified with perf-tools-next repo on both branches namely tmp.perf-tools-next and perf-tools-next, and I think this warning got recently introduced.
> 
> /Typo in the last mail, please refer to below update./
> 
> I verified with perf-tools-next repo on both branches namely tmp.perf-tools-next and perf-tools-next, and issue is not seen there. And I think this warning got recently introduced.

Hi Venkat, 

Can you please check with this change:

From 9a92d361ca2c22ac774b904211eb8c4f7c80fc85 Mon Sep 17 00:00:00 2001
From: Athira Rajeev <atrajeev@...ux.ibm.com>
Date: Fri, 9 May 2025 07:49:40 -0500
Subject: [PATCH] tools headers: Update the include/vdso/unaligned.h to sync
 headers

To pick up the changes in:
commit acea9943271b ("vdso: Address variable shadowing in macros")

Addressing this perf tools build warning:

diff -u tools/include/vdso/unaligned.h include/vdso/unaligned.h

Reported-by: Venkat Rao Bagalkote <venkat88@...ux.ibm.com>
Signed-off-by: Athira Rajeev <atrajeev@...ux.ibm.com>
---
 tools/include/vdso/unaligned.h | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/tools/include/vdso/unaligned.h b/tools/include/vdso/unaligned.h
index eee3d2a4dbe4..ff0c06b6513e 100644
--- a/tools/include/vdso/unaligned.h
+++ b/tools/include/vdso/unaligned.h
@@ -2,14 +2,14 @@
 #ifndef __VDSO_UNALIGNED_H
 #define __VDSO_UNALIGNED_H
  -#define __get_unaligned_t(type, ptr) ({ \
- const struct { type x; } __packed *__pptr = (typeof(__pptr))(ptr); \
- __pptr->x; \
+#define __get_unaligned_t(type, ptr) ({ \
+ const struct { type x; } __packed * __get_pptr = (typeof(__get_pptr))(ptr); \
+ __get_pptr->x; \
 })
  -#define __put_unaligned_t(type, val, ptr) do { \
- struct { type x; } __packed *__pptr = (typeof(__pptr))(ptr); \
- __pptr->x = (val); \
+#define __put_unaligned_t(type, val, ptr) do { \
+ struct { type x; } __packed * __put_pptr = (typeof(__put_pptr))(ptr); \
+ __put_pptr->x = (val); \
 } while (0)
   #endif /* __VDSO_UNALIGNED_H */
--  2.47.1

Thanks
Athira

Hi Namhyung,

I see we have few other warnings for which fixes is planned to picked for next cycle: https://lore.kernel.org/linux-perf-users/FE96FD04-4396-4C34-A70D-2A592FD5F916@linux.ibm.com/T/#me2ee1b70aeaad4901fb4d995b3b3015cd32f1adc

Can we also consider picking this one include/vdso/unaligned.h .. Once Venkat tests , I will post this as separate patch

Thanks
Athira
> 
>> 
>> Git Bisect is pointing to acea9943271b62905033f2f8ca571cdd52d6ea7b as first bad commit.
>> 
>> 
>> Below is the bisect log:
>> 
>> git bisect log
>> git bisect start
>> # status: waiting for both good and bad commits
>> # bad: [834a4a689699090a406d1662b03affa8b155d025] Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma
>> git bisect bad 834a4a689699090a406d1662b03affa8b155d025
>> # status: waiting for good commit(s), bad commit known
>> # good: [0af2f6be1b4281385b618cb86ad946eded089ac8] Linux 6.15-rc1
>> git bisect good 0af2f6be1b4281385b618cb86ad946eded089ac8
>> # bad: [ef7785882672e73847fb80f6c39e76998d4db57b] Merge tag 'bcachefs-2025-04-10' of git://evilpiepirate.org/bcachefs
>> git bisect bad ef7785882672e73847fb80f6c39e76998d4db57b
>> # good: [e4742a89cfaced383db758bef94037637899487a] Merge tag 'block-6.15-20250410' of git://git.kernel.dk/linux
>> git bisect good e4742a89cfaced383db758bef94037637899487a
>> # good: [eaa517b77e63442260640d875f824d1111ca6569] ethtool: cmis_cdb: Fix incorrect read / write length extension
>> git bisect good eaa517b77e63442260640d875f824d1111ca6569
>> # good: [ac253a537da3b210fa4b65d522d5533fc68f9515] Merge tag 'perf-urgent-2025-04-10' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
>> git bisect good ac253a537da3b210fa4b65d522d5533fc68f9515
>> # good: [3c9de67dd37029cca1d0f391ff565b3809b40a1f] Merge tag 'x86-urgent-2025-04-10' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
>> git bisect good 3c9de67dd37029cca1d0f391ff565b3809b40a1f
>> # bad: [0c7cae12f67c4c5fd232cffb27023deb409e1e20] Merge tag 'irq-urgent-2025-04-10' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
>> git bisect bad 0c7cae12f67c4c5fd232cffb27023deb409e1e20
>> # bad: [34833819d2270ef96fa98fe3c1d3d297b5dec986] Merge tag 'timers-urgent-2025-04-10' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
>> git bisect bad 34833819d2270ef96fa98fe3c1d3d297b5dec986
>> # good: [92e250c624ea37fde64bfd624fd2556f0d846f18] timekeeping: Add a lockdep override in tick_freeze()
>> git bisect good 92e250c624ea37fde64bfd624fd2556f0d846f18
>> # bad: [acea9943271b62905033f2f8ca571cdd52d6ea7b] vdso: Address variable shadowing in macros
>> git bisect bad acea9943271b62905033f2f8ca571cdd52d6ea7b
>> # first bad commit: [acea9943271b62905033f2f8ca571cdd52d6ea7b] vdso: Address variable shadowing in macros
>> 
>> 
>> Regards,
>> 
>> Venkat.
>> 
>>> 
>>> Also there is a patchset here:
>>> https://lore.kernel.org/linux-perf-users/FE96FD04-4396-4C34-A70D-2A592FD5F916@linux.ibm.com/T/#m3e9d6aac4c34ebf42f18f3c213b7dff8f8c70d9d 
>>> 
>>> Which I think you have already tested..
>>> 
>>> Thanks
>>> Athira
>>>> 
>>>> Regards,
>>>> 
>>>> Venkat.