From: William Cohen <wcohen@redhat.com>
To: tonyj@suse.de, systemtap@sourceware.org
Cc: wcohen@redhat.com, mcermak@redhat.com
Subject: Re: [PATCH] sym.c: fix module_kallsyms_on_each_symbol not exported
Date: Wed, 19 Jun 2024 21:37:58 -0400 [thread overview]
Message-ID: <e2fdcd9f-6f4d-48a5-99fe-a6686e7df9c7@redhat.com> (raw)
In-Reply-To: <ZnG7P64kLXfETa3s@suse.de>
Hi,
I plan on taking a look at this patch Thursday. Do you have a pointer to the environment (distribution, specific kernel) where systemtap failed WITHOUT this patch? Thanks,
-Will
On 6/18/24 12:52, tonyj@suse.de wrote:
> module_kallsyms_on_each_symbol has never been exported (as noted by
> 33fae2d0107f ("This one seems simply like a non-export").
>
> If kallsyms_on_each_symbol is exported (a revert of upstream in our
> SLES case) then '!defined(STAPCONF_KALLSYMS_ON_EACH_SYMBOL_EXPORTED)'
> is false and the local definition of module_kallsyms_on_each_symbol is
> skipped.
>
> This results in:
> ERROR: modpost: "module_kallsyms_on_each_symbol" undefined!
>
> Fixes: 33fae2d0107fb6166b4eac3fdffd277829849ab0
> Signed-off-by: Tony Jones <tonyj@suse.de>
>
> diff --git a/runtime/sym.c b/runtime/sym.c
> index 23dd3be30..102257965 100644
> --- a/runtime/sym.c
> +++ b/runtime/sym.c
> @@ -1180,7 +1180,8 @@ unsigned long kallsyms_lookup_name (const char *name)
> }
> #endif
>
> -#if defined(STAPCONF_KALLSYMS_ON_EACH_SYMBOL) && !defined(STAPCONF_KALLSYMS_ON_EACH_SYMBOL_EXPORTED)
> +#if defined(STAPCONF_KALLSYMS_ON_EACH_SYMBOL)
> +#if !defined(STAPCONF_KALLSYMS_ON_EACH_SYMBOL_EXPORTED)
> #ifndef KALLSYMS_H_INCLUDED
> #include <linux/kallsyms.h>
> #endif
> @@ -1209,11 +1210,12 @@ int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *,
> _stp_error("BUG: attempting to use unavailable kallsyms_on_each_symbol!!\n");
> return 0;
> }
> +#endif // !defined(STAPCONF_KALLSYMS_ON_EACH_SYMBOL_EXPORTED)
>
> +// XXX module_kallsyms_on_each_symbol has never been exported
> #if LINUX_VERSION_CODE >= KERNEL_VERSION(5,12,0)
> typedef typeof(&module_kallsyms_on_each_symbol) module_kallsyms_on_each_symbol_fn;
>
> -// XXX Will be linked in place of the kernel's module_kallsyms_on_each_symbol:
> #if defined(STAPCONF_KALLSYMS_6_4)
> int module_kallsyms_on_each_symbol(const char *modname,
> int (*fn)(void *, const char *,
>
next prev parent reply other threads:[~2024-06-20 1:38 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-18 16:52 tonyj
2024-06-20 1:37 ` William Cohen [this message]
2024-06-20 18:32 ` tonyj
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