From: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
To: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
"H. Peter Anvin" <hpa@zytor.com>, Arnd Bergmann <arnd@arndb.de>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Kees Cook <keescook@chromium.org>,
Will Deacon <will.deacon@arm.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Thomas Garnier <thgarnie@google.com>,
Thomas Gleixner <tglx@linutronix.de>,
"Serge E. Hallyn" <serge@hallyn.com>,
Bjorn Helgaas <bhelgaas@google.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Petr Mladek <pmladek@suse.com>, Ingo Molnar <mingo@redhat.com>,
James Morris <james.l.morris@oracle.com>,
Andrew Morton <akpm@linux-foundation.org>,
Nicolas Pitre <nico@linaro.org>, Steven Rostedt <rosted>
Subject: Re: [PATCH 0/5] add support for relative references in special sections
Date: Fri, 18 Aug 2017 14:56:55 +0900 [thread overview]
Message-ID: <20170818055655.GA495@jagdpanzerIV.localdomain> (raw)
In-Reply-To: <20170814105231.14608-1-ard.biesheuvel@linaro.org>
On (08/14/17 11:52), Ard Biesheuvel wrote:
> This adds support for emitting special sections such as initcall arrays,
> PCI fixups and tracepoints as relative references rather than absolute
> references. This reduces the size by 50% on 64-bit architectures, but
> more importantly, it removes the need for carrying relocation metadata
> for these sections in relocatables kernels (e.g., for KASLR) that need
> to fix up these absolute references at boot time. On arm64, this reduces
> the vmlinux footprint of such a reference by 8x (8 byte absolute reference
> + 24 byte RELA entry vs 4 byte relative reference)
[..]
a side note,
checkpatch complaints quite a lot.
-ss
WARNING: multiple messages have this Message-ID (diff)
From: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
To: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
"H. Peter Anvin" <hpa@zytor.com>, Arnd Bergmann <arnd@arndb.de>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Kees Cook <keescook@chromium.org>,
Will Deacon <will.deacon@arm.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Thomas Garnier <thgarnie@google.com>,
Thomas Gleixner <tglx@linutronix.de>,
"Serge E. Hallyn" <serge@hallyn.com>,
Bjorn Helgaas <bhelgaas@google.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Petr Mladek <pmladek@suse.com>, Ingo Molnar <mingo@redhat.com>,
James Morris <james.l.morris@oracle.com>,
Andrew Morton <akpm@linux-foundation.org>,
Nicolas Pitre <nico@linaro.org>,
Steven Rostedt <rostedt@goodmis.org>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
Jessica Yu <jeyu@kernel.org>
Subject: Re: [PATCH 0/5] add support for relative references in special sections
Date: Fri, 18 Aug 2017 14:56:55 +0900 [thread overview]
Message-ID: <20170818055655.GA495@jagdpanzerIV.localdomain> (raw)
Message-ID: <20170818055655.Y3OYjyeSugMvh_bBskBzoR6HSaBF_N4CWBDnGincB24@z> (raw)
In-Reply-To: <20170814105231.14608-1-ard.biesheuvel@linaro.org>
On (08/14/17 11:52), Ard Biesheuvel wrote:
> This adds support for emitting special sections such as initcall arrays,
> PCI fixups and tracepoints as relative references rather than absolute
> references. This reduces the size by 50% on 64-bit architectures, but
> more importantly, it removes the need for carrying relocation metadata
> for these sections in relocatables kernels (e.g., for KASLR) that need
> to fix up these absolute references at boot time. On arm64, this reduces
> the vmlinux footprint of such a reference by 8x (8 byte absolute reference
> + 24 byte RELA entry vs 4 byte relative reference)
[..]
a side note,
checkpatch complaints quite a lot.
-ss
next prev parent reply other threads:[~2017-08-18 5:56 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-14 10:52 [PATCH 0/5] add support for relative references in special sections Ard Biesheuvel
2017-08-14 10:52 ` Ard Biesheuvel
2017-08-14 10:52 ` [PATCH 1/5] arch: enable relative relocations for arm64, power, x86, s390 and x86 Ard Biesheuvel
2017-08-14 10:52 ` Ard Biesheuvel
2017-08-14 10:52 ` [PATCH 2/5] module: use relative references for __ksymtab entries Ard Biesheuvel
2017-08-14 10:52 ` Ard Biesheuvel
2017-08-14 10:52 ` [PATCH 3/5] init: allow initcall tables to be emitted using relative references Ard Biesheuvel
2017-08-14 10:52 ` Ard Biesheuvel
2017-08-14 10:52 ` [PATCH 4/5] drivers: pci: add support for relative addressing in quirk tables Ard Biesheuvel
2017-08-14 10:52 ` Ard Biesheuvel
2017-08-14 10:52 ` [PATCH 5/5] kernel: tracepoints: add support for relative references Ard Biesheuvel
2017-08-14 10:52 ` Ard Biesheuvel
2017-08-14 15:23 ` Steven Rostedt
2017-08-14 15:23 ` Steven Rostedt
2017-08-14 15:29 ` Ard Biesheuvel
2017-08-14 15:29 ` Ard Biesheuvel
2017-08-18 8:26 ` Ingo Molnar
2017-08-18 8:26 ` Ingo Molnar
2017-08-18 8:36 ` Ard Biesheuvel
2017-08-18 8:36 ` Ard Biesheuvel
2017-08-18 9:24 ` Ard Biesheuvel
2017-08-18 9:24 ` Ard Biesheuvel
2017-08-18 17:58 ` Ingo Molnar
2017-08-18 17:58 ` Ingo Molnar
2017-08-18 18:17 ` Ard Biesheuvel
2017-08-18 18:17 ` Ard Biesheuvel
2017-08-18 5:56 ` Sergey Senozhatsky [this message]
2017-08-18 5:56 ` [PATCH 0/5] add support for relative references in special sections Sergey Senozhatsky
2017-08-18 6:12 ` Ard Biesheuvel
2017-08-18 6:12 ` Ard Biesheuvel
2017-08-18 6:29 ` Sergey Senozhatsky
2017-08-18 6:29 ` Sergey Senozhatsky
2017-08-18 6:33 ` Ard Biesheuvel
2017-08-18 6:33 ` Ard Biesheuvel
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