From: Stephen Boyd <swboyd@chromium.org>
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Petr Mladek <pmladek@suse.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, Jiri Olsa <jolsa@kernel.org>,
Alexei Starovoitov <ast@kernel.org>, Jessica Yu <jeyu@kernel.org>,
Evan Green <evgreen@chromium.org>,
Hsin-Yi Wang <hsinyi@chromium.org>,
Steven Rostedt <rostedt@goodmis.org>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
linux-doc@vger.kernel.org, Matthew Wilcox <willy@infradead.org>
Subject: Re: [PATCH v4 05/13] module: Add printk formats to add module build ID to stacktraces
Date: Tue, 13 Apr 2021 15:36:57 -0700 [thread overview]
Message-ID: <161835341789.3764895.11018828620037960038@swboyd.mtv.corp.google.com> (raw)
In-Reply-To: <161834460576.3764895.758141455860109099@swboyd.mtv.corp.google.com>
Quoting Stephen Boyd (2021-04-13 13:10:05)
> Quoting Petr Mladek (2021-04-13 08:16:20)
> > On Tue 2021-04-13 13:56:31, Andy Shevchenko wrote:
> > > On Mon, Apr 12, 2021 at 12:29:05PM -0700, Stephen Boyd wrote:
> > > > Quoting Andy Shevchenko (2021-04-12 04:58:02)
> > > > >
> > > > > First of all, why not static_assert() defined near to the actual macro?
> > > >
> > > > Which macro? BUILD_ID_SIZE_MAX?
> > >
> > > Yes.
> > >
> > > > I tried static_assert() and it didn't
> > > > work for me but maybe I missed something.
> >
> > I guess that you wanted to use it inside macro definition:
> >
> > #define VMCOREINFO_BUILD_ID(value) \
> > static_assert(ARRAY_SIZE(value) == BUILD_ID_SIZE_MAX); \
> > vmcoreinfo_append_str("BUILD-ID=%20phN\n", value)
> >
> > Instead, you should do it outside the macro:
> >
> > static_assert(ARRAY_SIZE(value) == BUILD_ID_SIZE_MAX);
> > #define VMCOREINFO_BUILD_ID(value) \
> > vmcoreinfo_append_str("BUILD-ID=%20phN\n", value)
>
> In this example "value" is not defined because it's an argument to the
> macro. How can this work?
>
> From what I can tell static_assert() is for the case that you want to
> assert something at the global scope level. BUILD_BUG_ON() can't be used
> at global scope. I see the usage is usually to assert struct members and
> alignment of those members. In turn, static_assert() can't be used at
> function level scope. Each has a use and in this case I want to assert
> at function level scope to be as close as possible to the place that
> would need to change.
>
Good news. I can do this to force a basic block and then GCC doesn't complain.
---8<---
diff --git a/include/linux/crash_core.h b/include/linux/crash_core.h
index 2174dab16ba9..de62a722431e 100644
--- a/include/linux/crash_core.h
+++ b/include/linux/crash_core.h
@@ -38,9 +38,12 @@ phys_addr_t paddr_vmcoreinfo_note(void);
#define VMCOREINFO_OSRELEASE(value) \
vmcoreinfo_append_str("OSRELEASE=%s\n", value)
-#define VMCOREINFO_BUILD_ID(value) \
- BUILD_BUG_ON(ARRAY_SIZE(value) != BUILD_ID_SIZE_MAX); \
- vmcoreinfo_append_str("BUILD-ID=%20phN\n", value)
+#define VMCOREINFO_BUILD_ID() \
+ ({ \
+ static_assert(sizeof(vmlinux_build_id) == 20); \
+ vmcoreinfo_append_str("BUILD-ID=%20phN\n", vmlinux_build_id); \
+ })
+
#define VMCOREINFO_PAGESIZE(value) \
vmcoreinfo_append_str("PAGESIZE=%ld\n", value)
next prev parent reply other threads:[~2021-04-13 22:37 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-10 1:52 [PATCH v4 00/13] Add build ID to stacktraces Stephen Boyd
2021-04-10 1:52 ` [PATCH v4 01/13] buildid: Only consider GNU notes for build ID parsing Stephen Boyd
2021-04-13 14:34 ` Petr Mladek
2021-04-10 1:52 ` [PATCH v4 02/13] buildid: Add API to parse build ID out of buffer Stephen Boyd
2021-04-10 1:52 ` [PATCH v4 03/13] buildid: Stash away kernels build ID on init Stephen Boyd
2021-04-10 1:52 ` [PATCH v4 04/13] dump_stack: Add vmlinux build ID to stack traces Stephen Boyd
2021-04-13 14:41 ` Petr Mladek
2021-04-13 20:36 ` Stephen Boyd
2021-04-10 1:52 ` [PATCH v4 05/13] module: Add printk formats to add module build ID to stacktraces Stephen Boyd
2021-04-12 11:58 ` Andy Shevchenko
2021-04-12 19:29 ` Stephen Boyd
2021-04-13 10:56 ` Andy Shevchenko
2021-04-13 15:16 ` Petr Mladek
2021-04-13 20:10 ` Stephen Boyd
2021-04-13 22:36 ` Stephen Boyd [this message]
2021-04-13 15:01 ` Petr Mladek
2021-04-13 22:57 ` Stephen Boyd
2021-04-15 8:53 ` Petr Mladek
2021-04-15 13:04 ` Jessica Yu
2021-04-18 1:52 ` Stephen Boyd
2021-04-19 10:34 ` Jessica Yu
2021-04-10 1:52 ` [PATCH v4 06/13] arm64: stacktrace: Use %pSb for backtrace printing Stephen Boyd
2021-04-10 1:52 ` [PATCH v4 07/13] x86/dumpstack: Use %pSb/%pBb " Stephen Boyd
2021-04-10 1:52 ` [PATCH v4 08/13] scripts/decode_stacktrace.sh: Support debuginfod Stephen Boyd
2021-04-10 1:52 ` [PATCH v4 09/13] scripts/decode_stacktrace.sh: Silence stderr messages from addr2line/nm Stephen Boyd
2021-04-10 1:52 ` [PATCH v4 10/13] scripts/decode_stacktrace.sh: Indicate 'auto' can be used for base path Stephen Boyd
2021-04-10 1:52 ` [PATCH v4 11/13] buildid: Mark some arguments const Stephen Boyd
2021-04-10 1:52 ` [PATCH v4 12/13] buildid: Fix kernel-doc notation Stephen Boyd
2021-04-10 1:53 ` [PATCH v4 13/13] kdump: Use vmlinux_build_id to simplify Stephen Boyd
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