From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Linus Torvalds <torvalds@linuxfoundation.org>,
Prarit Bhargava <prarit@redhat.com>,
Mark Salyzyn <salyzyn@android.com>,
Petr Mladek <pmladek@suse.com>, Ingo Molnar <mingo@kernel.org>,
"H. Peter Anvin" <hpa@zytor.com>,
Peter Zijlstra <peterz@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
Steven Rostedt <rostedt@goodmis.org>,
Joe Perches <joe@perches.com>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: [RFC patch 5/7] crash: Add VMCOREINFO_FIELD_AND_OFFSET()
Date: Wed, 15 Nov 2017 19:15:36 +0100 [thread overview]
Message-ID: <20171115182657.542096222@linutronix.de> (raw)
In-Reply-To: 20171115181531.322572387@linutronix.de
[-- Attachment #1: crash--Add-VMCOREINFO_FIELD_ANDOFFSET--.patch --]
[-- Type: text/plain, Size: 1353 bytes --]
Changing the time stamp storage in the printk ringbuffer entries would
break existing tools which rely on the availability of the 'ts_nsec' field
in vmcore info.
Provide a new macro which allows to store the offset of a member of struct
printk_log with a different name. This allows to change the underlying
storage and without breaking tools.
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
include/linux/crash_core.h | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/include/linux/crash_core.h
+++ b/include/linux/crash_core.h
@@ -48,9 +48,11 @@ phys_addr_t paddr_vmcoreinfo_note(void);
#define VMCOREINFO_STRUCT_SIZE(name) \
vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
(unsigned long)sizeof(struct name))
-#define VMCOREINFO_OFFSET(name, field) \
- vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \
+#define VMCOREINFO_FIELD_AND_OFFSET(name, fieldname, field) \
+ vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #fieldname, \
(unsigned long)offsetof(struct name, field))
+#define VMCOREINFO_OFFSET(name, field) \
+ VMCOREINFO_FIELD_AND_OFFSET(name, field, field)
#define VMCOREINFO_LENGTH(name, value) \
vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value)
#define VMCOREINFO_NUMBER(name) \
next prev parent reply other threads:[~2017-11-15 18:29 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-15 18:15 [RFC patch 0/7] printk: Switch to CLOCK_MONOTONIC and store extra time stamps Thomas Gleixner
2017-11-15 18:15 ` [RFC patch 1/7] timekeeping: Do not unconditionally suspend NMI safe timekeepers Thomas Gleixner
2017-11-15 18:15 ` [RFC patch 2/7] x86/tsc: Set clocksource CLOCK_SOURCE_SUSPEND_ACCESS_OK Thomas Gleixner
2017-11-15 18:15 ` [RFC patch 3/7] printk: Use clock MONOTONIC for timestamps Thomas Gleixner
2017-11-16 7:58 ` Sergey Senozhatsky
2017-11-15 18:15 ` [RFC patch 4/7] timekeeping: Add NMI safe accessor to mono/boot/real clocks Thomas Gleixner
2017-11-17 23:00 ` Steven Rostedt
2017-11-17 23:12 ` Linus Torvalds
2017-11-17 23:43 ` Thomas Gleixner
2017-11-15 18:15 ` Thomas Gleixner [this message]
2017-11-23 12:46 ` [RFC patch 5/7] crash: Add VMCOREINFO_FIELD_AND_OFFSET() Petr Mladek
2017-11-15 18:15 ` [RFC patch 6/7] printk: Store mono/boot/real time timestamps Thomas Gleixner
2017-11-23 13:36 ` Petr Mladek
2017-11-15 18:15 ` [RFC patch 7/7] timekeeping: Hack to use fine grained timestamps during boot Thomas Gleixner
2017-11-23 12:58 ` Petr Mladek
2017-11-28 18:43 ` Prarit Bhargava
2017-11-28 18:47 ` Thomas Gleixner
2017-12-08 11:23 ` Petr Mladek
2017-12-08 19:51 ` Thomas Gleixner
2017-11-28 19:10 ` Mark Salyzyn
2017-11-28 19:45 ` Steven Rostedt
2017-11-28 20:29 ` Mark Salyzyn
2017-11-28 20:38 ` Peter Zijlstra
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