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Date:   Tue, 17 Oct 2023 10:58:22 +0200
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Subject: Re: [PATCH 5.15 000/102] 5.15.136-rc1 review
Content-Language: en-US
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
Cc:     stable@vger.kernel.org, Sasha Levin <sashal@kernel.org>,
        patches@lists.linux.dev, linux-kernel@vger.kernel.org,
        torvalds@linux-foundation.org, akpm@linux-foundation.org,
        linux@roeck-us.net, shuah@kernel.org, patches@kernelci.org,
        lkft-triage@lists.linaro.org, pavel@denx.de, jonathanh@nvidia.com,
        f.fainelli@gmail.com, sudipm.mukherjee@gmail.com,
        srw@sladewatkins.net, rwarsow@gmx.de, conor@kernel.org
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On 16/10/2023 18:58, Greg Kroah-Hartman wrote:
> On Mon, Oct 16, 2023 at 09:23:36PM +0530, Harshit Mogalapalli wrote:
>> Cause for this build issue:
>> Commit: e2bf685d7e311 ("perf inject: Fix GEN_ELF_TEXT_OFFSET for jit")
>>
>> And this issue is not in upstream due to presence of commit d6e6a27d960f
>> ("tools: Fix math.h breakage") in upstream but not in 5.15.y
> 
> Ok, I'll go drop the patch entirely, I can't even get perf to build at
> all for me on 5.15, which is why I've given up on it even mattering
> anymore :(

Just for maximal clarity, there are several commits involved here:

1. babd04386b1d perf jit: Include program header in ELF files

This commit is already in 5.15.y but introduced a bug...

2. 89b15d00527b perf inject: Fix GEN_ELF_TEXT_OFFSET for jit

This commit is in this -rc1 and fixes the bug above, but introduces a
new perf build failure on 5.15.y. [This is the one I think you've now
dropped.]

3. d6e6a27d960f tools: Fix math.h breakage

This is a prerequisite for #2 and is not in 5.15.y. However, it has some
conflicts on 5.15.y, i.e. it probably has some prerequisites of its own
that I haven't looked into.

I guess the question is -- if we're dropping #2, should we drop #1 as
well? Or... instead of dropping either of them we could also apply a
minimal fix:

diff --git a/tools/perf/util/genelf.h b/tools/perf/util/genelf.h
index 159c69bcc33e..6e202db6c4d9 100644
--- a/tools/perf/util/genelf.h
+++ b/tools/perf/util/genelf.h
@@ -2,7 +2,7 @@
  #ifndef __GENELF_H__
  #define __GENELF_H__

-#include <linux/math.h>
+#include <linux/kernel.h>

  /* genelf.c */
  int jit_write_elf(int fd, uint64_t code_addr, const char *sym,


However, this is not what mainline does so technically it runs afoul of
the stable rules (although arguably I think we could also just make this
change to #2 and call it a backport).

Out of curiosity, Greg: what is your build error with perf? Given that
it builds for us (and we actually package perf so we need it) it sounds
like maybe you're missing a package in your environment or something? If
you pass us your config + the output of

   make -C tools/perf/

I'd be happy to look into it. Only if you want though :-)


Vegard