From: Baoquan He <bhe@redhat.com> To: Stephen Boyd <swboyd@chromium.org> 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>, Dave Young <dyoung@redhat.com>, Vivek Goyal <vgoyal@redhat.com>, kexec@lists.infradead.org Subject: Re: [PATCH v5 13/13] kdump: Use vmlinux_build_id to simplify Date: Fri, 7 May 2021 12:04:57 +0800 [thread overview] Message-ID: <20210507040457.GB23668@MiWiFi-R3L-srv> (raw) In-Reply-To: <20210507035418.GA23668@MiWiFi-R3L-srv> On 05/07/21 at 11:54am, Baoquan He wrote: > On 04/29/21 at 01:14am, Stephen Boyd wrote: > > Quoting Baoquan He (2021-04-28 03:13:55) > > > On 04/20/21 at 02:50pm, Stephen Boyd wrote: > > > > We can use the vmlinux_build_id array here now instead of open coding > > > > it. This mostly consolidates code. > > > > > > > > Cc: Jiri Olsa <jolsa@kernel.org> > > > > Cc: Alexei Starovoitov <ast@kernel.org> > > > > Cc: Jessica Yu <jeyu@kernel.org> > > > > Cc: Evan Green <evgreen@chromium.org> > > > > Cc: Hsin-Yi Wang <hsinyi@chromium.org> > > > > Cc: Dave Young <dyoung@redhat.com> > > > > Cc: Baoquan He <bhe@redhat.com> > > > > Cc: Vivek Goyal <vgoyal@redhat.com> > > > > Cc: <kexec@lists.infradead.org> > > > > Signed-off-by: Stephen Boyd <swboyd@chromium.org> > > > > --- > > > > include/linux/crash_core.h | 12 ++++----- > > > > kernel/crash_core.c | 50 ++------------------------------------ > > > > 2 files changed, 8 insertions(+), 54 deletions(-) > > > > > > > > diff --git a/include/linux/crash_core.h b/include/linux/crash_core.h > > > > index 206bde8308b2..de62a722431e 100644 > > > > --- a/include/linux/crash_core.h > > > > +++ b/include/linux/crash_core.h > > > > @@ -38,8 +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) \ > > > > - vmcoreinfo_append_str("BUILD-ID=%s\n", value) > > > > +#define VMCOREINFO_BUILD_ID() \ > > > > + ({ \ > > > > + static_assert(sizeof(vmlinux_build_id) == 20); \ > > > > + vmcoreinfo_append_str("BUILD-ID=%20phN\n", vmlinux_build_id); \ > > > > > > Since there has been static_assert at above, can we remove the magic > > > number '20'? > > > > > > And I checked format_decode(), didn't find which type corresponds to > > > 'N', could you tell? > > > > It is documented in Documentation/core-api/printk-formats.rst (see "Raw > > buffer as a hex string") where the '20' replaces the '*' to specify a > > fixed size buffer to format. We could pass the 20 as an argument instead > > of encoding it in the format, but then it would still be there twice. We > > could use a #define but then it would have to be passed as an argument. > > Thanks for telling, I can see 'phN' is used in many places, but haven't > figured out how it's parsed, e.g in format_decode() it's not related. > Anyway, I may need dig further or search to get it. > > > > > I don't know of a good way to enforce in printk that the buffer is the > > size that matches the format size. Maybe it shouldn't be an option to > > have a size in the format string if it's a problem to put the size of > > the buffer in there. > > Oh, I meant that we may not need to enforce that because the size of > vmlinux_build_id can be guaranteed, always 20, we do not need to specify > the '20'? Afaik, we usually specify the format size when the string size > is variable, and we want to add '0' to make the width of printing is ~'space' I meant > fixed. Anyway, this dones't matter much. > > Acked-by: Baoquan He <bhe@redhat.com> > > Thanks > Baoquan > > > > > > > > > Other than these, this patch looks good to me, thanks for the effort. > > > > > > > Thanks. > > > > _______________________________________________ > > kexec mailing list > > kexec@lists.infradead.org > > http://lists.infradead.org/mailman/listinfo/kexec > > > > > _______________________________________________ > kexec mailing list > kexec@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/kexec >
WARNING: multiple messages have this Message-ID (diff)
From: Baoquan He <bhe@redhat.com> To: Stephen Boyd <swboyd@chromium.org> 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>, Dave Young <dyoung@redhat.com>, Vivek Goyal <vgoyal@redhat.com>, kexec@lists.infradead.org Subject: Re: [PATCH v5 13/13] kdump: Use vmlinux_build_id to simplify Date: Fri, 7 May 2021 12:04:57 +0800 [thread overview] Message-ID: <20210507040457.GB23668@MiWiFi-R3L-srv> (raw) In-Reply-To: <20210507035418.GA23668@MiWiFi-R3L-srv> On 05/07/21 at 11:54am, Baoquan He wrote: > On 04/29/21 at 01:14am, Stephen Boyd wrote: > > Quoting Baoquan He (2021-04-28 03:13:55) > > > On 04/20/21 at 02:50pm, Stephen Boyd wrote: > > > > We can use the vmlinux_build_id array here now instead of open coding > > > > it. This mostly consolidates code. > > > > > > > > Cc: Jiri Olsa <jolsa@kernel.org> > > > > Cc: Alexei Starovoitov <ast@kernel.org> > > > > Cc: Jessica Yu <jeyu@kernel.org> > > > > Cc: Evan Green <evgreen@chromium.org> > > > > Cc: Hsin-Yi Wang <hsinyi@chromium.org> > > > > Cc: Dave Young <dyoung@redhat.com> > > > > Cc: Baoquan He <bhe@redhat.com> > > > > Cc: Vivek Goyal <vgoyal@redhat.com> > > > > Cc: <kexec@lists.infradead.org> > > > > Signed-off-by: Stephen Boyd <swboyd@chromium.org> > > > > --- > > > > include/linux/crash_core.h | 12 ++++----- > > > > kernel/crash_core.c | 50 ++------------------------------------ > > > > 2 files changed, 8 insertions(+), 54 deletions(-) > > > > > > > > diff --git a/include/linux/crash_core.h b/include/linux/crash_core.h > > > > index 206bde8308b2..de62a722431e 100644 > > > > --- a/include/linux/crash_core.h > > > > +++ b/include/linux/crash_core.h > > > > @@ -38,8 +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) \ > > > > - vmcoreinfo_append_str("BUILD-ID=%s\n", value) > > > > +#define VMCOREINFO_BUILD_ID() \ > > > > + ({ \ > > > > + static_assert(sizeof(vmlinux_build_id) == 20); \ > > > > + vmcoreinfo_append_str("BUILD-ID=%20phN\n", vmlinux_build_id); \ > > > > > > Since there has been static_assert at above, can we remove the magic > > > number '20'? > > > > > > And I checked format_decode(), didn't find which type corresponds to > > > 'N', could you tell? > > > > It is documented in Documentation/core-api/printk-formats.rst (see "Raw > > buffer as a hex string") where the '20' replaces the '*' to specify a > > fixed size buffer to format. We could pass the 20 as an argument instead > > of encoding it in the format, but then it would still be there twice. We > > could use a #define but then it would have to be passed as an argument. > > Thanks for telling, I can see 'phN' is used in many places, but haven't > figured out how it's parsed, e.g in format_decode() it's not related. > Anyway, I may need dig further or search to get it. > > > > > I don't know of a good way to enforce in printk that the buffer is the > > size that matches the format size. Maybe it shouldn't be an option to > > have a size in the format string if it's a problem to put the size of > > the buffer in there. > > Oh, I meant that we may not need to enforce that because the size of > vmlinux_build_id can be guaranteed, always 20, we do not need to specify > the '20'? Afaik, we usually specify the format size when the string size > is variable, and we want to add '0' to make the width of printing is ~'space' I meant > fixed. Anyway, this dones't matter much. > > Acked-by: Baoquan He <bhe@redhat.com> > > Thanks > Baoquan > > > > > > > > > Other than these, this patch looks good to me, thanks for the effort. > > > > > > > Thanks. > > > > _______________________________________________ > > kexec mailing list > > kexec@lists.infradead.org > > http://lists.infradead.org/mailman/listinfo/kexec > > > > > _______________________________________________ > kexec mailing list > kexec@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/kexec > _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec
next prev parent reply other threads:[~2021-05-07 4:05 UTC|newest] Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-04-20 21:49 [PATCH v5 00/13] Add build ID to stacktraces Stephen Boyd 2021-04-20 21:49 ` Stephen Boyd 2021-04-20 21:49 ` Stephen Boyd 2021-04-20 21:49 ` [PATCH v5 01/13] buildid: Only consider GNU notes for build ID parsing Stephen Boyd 2021-04-20 21:49 ` [PATCH v5 02/13] buildid: Add API to parse build ID out of buffer Stephen Boyd 2021-04-20 21:49 ` [PATCH v5 03/13] buildid: Stash away kernels build ID on init Stephen Boyd 2021-04-20 21:49 ` Stephen Boyd 2021-04-28 10:02 ` Baoquan He 2021-04-28 10:02 ` Baoquan He 2021-04-20 21:49 ` [PATCH v5 04/13] dump_stack: Add vmlinux build ID to stack traces Stephen Boyd 2021-04-26 11:04 ` Petr Mladek 2021-04-26 23:40 ` Stephen Boyd 2021-04-20 21:49 ` [PATCH v5 05/13] module: Add printk formats to add module build ID to stacktraces Stephen Boyd 2021-04-21 11:49 ` Andy Shevchenko 2021-04-22 23:46 ` Stephen Boyd 2021-04-23 13:24 ` Andy Shevchenko 2021-04-23 13:45 ` Rasmus Villemoes 2021-04-23 14:08 ` Andy Shevchenko 2021-04-26 23:42 ` Stephen Boyd 2021-04-20 21:49 ` [PATCH v5 06/13] arm64: stacktrace: Use %pSb for backtrace printing Stephen Boyd 2021-04-20 21:49 ` Stephen Boyd 2021-04-21 9:58 ` Catalin Marinas 2021-04-21 9:58 ` Catalin Marinas 2021-04-20 21:49 ` [PATCH v5 07/13] x86/dumpstack: Use %pSb/%pBb " Stephen Boyd 2021-04-20 21:49 ` [PATCH v5 08/13] scripts/decode_stacktrace.sh: Support debuginfod Stephen Boyd 2021-04-20 21:49 ` [PATCH v5 09/13] scripts/decode_stacktrace.sh: Silence stderr messages from addr2line/nm Stephen Boyd 2021-04-20 21:50 ` [PATCH v5 10/13] scripts/decode_stacktrace.sh: Indicate 'auto' can be used for base path Stephen Boyd 2021-04-20 21:50 ` [PATCH v5 11/13] buildid: Mark some arguments const Stephen Boyd 2021-04-20 21:50 ` [PATCH v5 12/13] buildid: Fix kernel-doc notation Stephen Boyd 2021-04-20 21:50 ` [PATCH v5 13/13] kdump: Use vmlinux_build_id to simplify Stephen Boyd 2021-04-20 21:50 ` Stephen Boyd 2021-04-28 10:13 ` Baoquan He 2021-04-28 10:13 ` Baoquan He 2021-04-28 23:14 ` Stephen Boyd 2021-04-28 23:14 ` Stephen Boyd 2021-05-07 3:54 ` Baoquan He 2021-05-07 3:54 ` Baoquan He 2021-05-07 4:04 ` Baoquan He [this message] 2021-05-07 4:04 ` Baoquan He
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