From: "H. Peter Anvin" <hpa@zytor.com>
To: Helge Deller <deller@gmx.de>,
Nick Desaulniers <ndesaulniers@google.com>,
torvalds@linux-foundation.org, akpm@linux-foundation.org
Cc: "Nicolas Pitre" <nicolas.pitre@linaro.org>,
linux-mips@linux-mips.org, linux-sh@vger.kernel.org,
"Benjamin Herrenschmidt" <benh@kernel.crashing.org>,
"Will Deacon" <will.deacon@arm.com>,
"Paul Mackerras" <paulus@samba.org>,
"Michael Ellerman" <mpe@ellerman.id.au>,
"James E.J. Bottomley" <jejb@parisc-linux.org>,
"Geert Uytterhoeven" <geert@linux-m68k.org>,
"Catalin Marinas" <catalin.marinas@arm.com>,
"Vasily Gorbik" <gor@linux.vnet.ibm.com>,
"Matt Turner" <mattst88@gmail.com>,
uclinux-h8-devel@lists.sourceforge.jp,
"Marc Zyngier" <marc.zyngier@arm.com>,
"Ram Pai" <linuxram@us.ibm.com>,
linux-um@lists.infradead.org,
"Nicholas Piggin" <npiggin@gmail.com>,
"Andy Lutomirski" <luto@kernel.org>,
"Shannon Nelson" <shannon.nelson@oracle.com>,
tglx@linutronix.de, "Alex Bennée" <alex.bennee@linaro.org>,
"Richard Henderson" <rth@twiddle.net>,
"Jiri Kosina" <jkosina@suse.cz>,
linux-kernel@vger.kerne
Subject: Re: [PATCH] treewide: remove current_text_addr
Date: Sat, 25 Aug 2018 21:56:11 -0700 [thread overview]
Message-ID: <7f49eeab-a5cc-867f-58fb-abd266f9c2c9@zytor.com> (raw)
In-Reply-To: <81141365-8168-799b-f34f-da5f92efaaf9@zytor.com>
On 08/25/18 20:16, H. Peter Anvin wrote:
> On 08/25/18 19:38, H. Peter Anvin wrote:
>>
>> If it was worthwhile it would make more sense to at least force this
>> into the rodata section with the string, something like the attached
>> file for an example; however, I have a hunch it doesn't matter.
>>
>
> An even nuttier version which avoids the extra pointer indirection.
> Read it and fear.
>
> -hpa
>
OK, so one more thing, I guess: it is necessary to suppress the tailcall
optimization for _RET_IP_ to make any sense, but that should be pretty
simple:
static inline void notailcall(void)
{
asm volatile("");
}
-hpa
next prev parent reply other threads:[~2018-08-26 4:56 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAKwvOdkWL_2yTnJqM6n6R9UCPwY4iz-9BQYGN2MDAk9EzumUvA@mail.gmail.com>
[not found] ` <20180821202900.208417-1-ndesaulniers@google.com>
[not found] ` <207784db-4fcc-85e7-a0b2-fec26b7dab81@gmx.de>
2018-08-26 2:38 ` [PATCH] treewide: remove current_text_addr H. Peter Anvin
2018-08-26 3:16 ` H. Peter Anvin
2018-08-26 4:56 ` H. Peter Anvin [this message]
2018-08-26 19:30 ` H. Peter Anvin
2018-08-26 20:25 ` Linus Torvalds
2018-08-27 2:52 ` Nick Desaulniers
2018-08-27 7:33 ` Peter Zijlstra
2018-08-27 12:26 ` H. Peter Anvin
2018-08-27 13:11 ` Peter Zijlstra
2018-08-27 13:33 ` H. Peter Anvin
2018-08-31 16:48 ` Nick Desaulniers
2018-08-27 7:43 ` Nicholas Piggin
2018-08-26 23:20 ` H. Peter Anvin
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