From: Russell King - ARM Linux <linux@arm.linux.org.uk> To: Michal Marek <mmarek@suse.cz> Cc: "Stephen Boyd" <sboyd@codeaurora.org>, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, "Thomas Petazzoni" <thomas.petazzoni@free-electrons.com>, linux-kbuild@vger.kernel.org, "Nicolas Pitre" <nico@fluxnic.net>, "Arnd Bergmann" <arnd@arndb.de>, "Steven Rostedt" <rostedt@goodmis.org>, "Måns Rullgård" <mans@mansr.com> Subject: Re: [PATCH v2 1/2] scripts: Add a recorduidiv program Date: Tue, 1 Dec 2015 16:19:44 +0000 [thread overview] Message-ID: <20151201161944.GX8644@n2100.arm.linux.org.uk> (raw) In-Reply-To: <565DC5A9.2010305@suse.cz> On Tue, Dec 01, 2015 at 05:07:05PM +0100, Michal Marek wrote: > On 2015-11-30 16:40, Michal Marek wrote: > > On 2015-11-30 16:32, Russell King - ARM Linux wrote: > >> On Mon, Nov 30, 2015 at 04:11:16PM +0100, Michal Marek wrote: > >>> On 2015-11-26 00:47, Russell King - ARM Linux wrote: > >>>> Do we have any resolution on these programs which modify the object > >>>> files in-place, rather than breaking any hard-links which may be > >>>> present (eg, as a result of using ccache in hard-link mode) ? > >>> > >>> Good point, but I do not think anybody is using CCACHE_HARDLINK with the > >>> kernel. > >> > >> That's wrong then, because I've been using it for a very long time with > >> my nightly builds. :) Therefore, there is somebody! > > > > OK. > > So, both recordmcount and the new recordudiv program are idempotent. > They check if the to-be-added section is already present and do nothing. They hardly "do nothing", as the (eg) recordmcount plasters the build log with warnings. A solution to that would be to make recordmcount silent if the section is already present. > So the result is correct even with CCACHE_HARDLINK, just the > intermediate file might be incorrect. If this still is considered an > issue, I suggest clearing CCACHE_HARDLINK when using any of these > postprocessors, so as not to penalize other use cases. Another solution would be to have the top level make file unset the CCACHE_HARDLINK environment variable if any of the options which enable in-place editing of object files is enabled. Looking at the ccache code, the environment variable has to be deleted from the environment to turn off the option - and I'm not sure whether make can delete environment variables. It certainly can override them, but I see nothing in the info pages which suggests that environment variables can be deleted by a makefile. However, doing it outside of the kernel build system is likely error prone especially as the kernel configuration options change and/or their effect changes. -- FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up according to speedtest.net.
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From: linux@arm.linux.org.uk (Russell King - ARM Linux) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v2 1/2] scripts: Add a recorduidiv program Date: Tue, 1 Dec 2015 16:19:44 +0000 [thread overview] Message-ID: <20151201161944.GX8644@n2100.arm.linux.org.uk> (raw) In-Reply-To: <565DC5A9.2010305@suse.cz> On Tue, Dec 01, 2015 at 05:07:05PM +0100, Michal Marek wrote: > On 2015-11-30 16:40, Michal Marek wrote: > > On 2015-11-30 16:32, Russell King - ARM Linux wrote: > >> On Mon, Nov 30, 2015 at 04:11:16PM +0100, Michal Marek wrote: > >>> On 2015-11-26 00:47, Russell King - ARM Linux wrote: > >>>> Do we have any resolution on these programs which modify the object > >>>> files in-place, rather than breaking any hard-links which may be > >>>> present (eg, as a result of using ccache in hard-link mode) ? > >>> > >>> Good point, but I do not think anybody is using CCACHE_HARDLINK with the > >>> kernel. > >> > >> That's wrong then, because I've been using it for a very long time with > >> my nightly builds. :) Therefore, there is somebody! > > > > OK. > > So, both recordmcount and the new recordudiv program are idempotent. > They check if the to-be-added section is already present and do nothing. They hardly "do nothing", as the (eg) recordmcount plasters the build log with warnings. A solution to that would be to make recordmcount silent if the section is already present. > So the result is correct even with CCACHE_HARDLINK, just the > intermediate file might be incorrect. If this still is considered an > issue, I suggest clearing CCACHE_HARDLINK when using any of these > postprocessors, so as not to penalize other use cases. Another solution would be to have the top level make file unset the CCACHE_HARDLINK environment variable if any of the options which enable in-place editing of object files is enabled. Looking at the ccache code, the environment variable has to be deleted from the environment to turn off the option - and I'm not sure whether make can delete environment variables. It certainly can override them, but I see nothing in the info pages which suggests that environment variables can be deleted by a makefile. However, doing it outside of the kernel build system is likely error prone especially as the kernel configuration options change and/or their effect changes. -- FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up according to speedtest.net.
next prev parent reply other threads:[~2015-12-01 16:19 UTC|newest] Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-11-25 21:51 [PATCH v2 0/2] ARM: Use udiv/sdiv for __aeabi_{u}idiv library functions Stephen Boyd 2015-11-25 21:51 ` Stephen Boyd 2015-11-25 21:51 ` Stephen Boyd 2015-11-25 21:51 ` [PATCH v2 1/2] scripts: Add a recorduidiv program Stephen Boyd 2015-11-25 21:51 ` Stephen Boyd 2015-11-25 23:47 ` Russell King - ARM Linux 2015-11-25 23:47 ` Russell King - ARM Linux 2015-11-30 15:11 ` Michal Marek 2015-11-30 15:11 ` Michal Marek 2015-11-30 15:32 ` Russell King - ARM Linux 2015-11-30 15:32 ` Russell King - ARM Linux 2015-11-30 15:32 ` Russell King - ARM Linux 2015-11-30 15:40 ` Michal Marek 2015-11-30 15:40 ` Michal Marek 2015-12-01 16:07 ` Michal Marek 2015-12-01 16:07 ` Michal Marek 2015-12-01 16:19 ` Russell King - ARM Linux [this message] 2015-12-01 16:19 ` Russell King - ARM Linux 2015-12-01 16:43 ` Michal Marek 2015-12-01 16:43 ` Michal Marek 2015-12-01 16:49 ` Steven Rostedt 2015-12-01 16:49 ` Steven Rostedt 2015-12-01 17:10 ` Russell King - ARM Linux 2015-12-01 17:10 ` Russell King - ARM Linux 2015-12-01 17:22 ` Steven Rostedt 2015-12-01 17:22 ` Steven Rostedt 2015-12-01 18:16 ` Russell King - ARM Linux 2015-12-01 18:16 ` Russell King - ARM Linux 2015-12-01 21:39 ` Michal Marek 2015-12-01 21:39 ` Michal Marek 2015-12-02 10:23 ` Russell King - ARM Linux 2015-12-02 10:23 ` Russell King - ARM Linux 2015-12-02 14:05 ` Steven Rostedt 2015-12-02 14:05 ` Steven Rostedt 2015-12-11 12:09 ` [PATCH] scripts: recordmcount: break hardlinks Russell King 2015-12-11 12:09 ` Russell King 2015-12-11 14:31 ` Steven Rostedt 2015-12-11 14:31 ` Steven Rostedt 2015-12-11 14:45 ` Russell King - ARM Linux 2015-12-11 14:45 ` Russell King - ARM Linux 2015-12-11 15:08 ` Steven Rostedt 2015-12-11 15:08 ` Steven Rostedt 2015-12-11 18:10 ` Steven Rostedt 2015-12-11 18:10 ` Steven Rostedt 2015-12-11 18:33 ` Russell King - ARM Linux 2015-12-11 18:33 ` Russell King - ARM Linux 2015-12-11 18:51 ` Steven Rostedt 2015-12-11 18:51 ` Steven Rostedt 2015-12-11 18:58 ` Russell King - ARM Linux 2015-12-11 18:58 ` Russell King - ARM Linux 2015-12-11 19:28 ` Steven Rostedt 2015-12-11 19:28 ` Steven Rostedt 2015-11-25 21:51 ` [PATCH v2 2/2] ARM: Replace calls to __aeabi_{u}idiv with udiv/sdiv instructions Stephen Boyd 2015-11-25 21:51 ` Stephen Boyd 2015-11-25 23:09 ` Nicolas Pitre 2015-11-25 23:09 ` Nicolas Pitre 2015-11-26 0:05 ` Russell King - ARM Linux 2015-11-26 0:05 ` Russell King - ARM Linux 2015-11-26 0:07 ` Måns Rullgård 2015-11-26 0:07 ` Måns Rullgård 2015-11-26 0:44 ` Nicolas Pitre 2015-11-26 0:44 ` Nicolas Pitre 2015-11-26 0:50 ` Måns Rullgård 2015-11-26 0:50 ` Måns Rullgård 2015-11-26 0:50 ` Måns Rullgård 2015-11-26 1:28 ` Russell King - ARM Linux 2015-11-26 1:28 ` Russell King - ARM Linux 2015-11-26 1:28 ` Russell King - ARM Linux 2015-11-26 2:19 ` Måns Rullgård 2015-11-26 2:19 ` Måns Rullgård 2015-11-26 2:19 ` Måns Rullgård 2015-11-26 5:32 ` Nicolas Pitre 2015-11-26 5:32 ` Nicolas Pitre 2015-11-26 12:41 ` Måns Rullgård 2015-11-26 12:41 ` Måns Rullgård 2015-11-26 12:41 ` Måns Rullgård 2015-11-26 0:08 ` Russell King - ARM Linux 2015-11-26 0:08 ` Russell King - ARM Linux 2015-11-26 0:08 ` Russell King - ARM Linux
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