linux-kernel - Re: [GIT PULL] x86 fixes

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Message-ID: <20150720072037.GA3607@osiris>
Date:	Mon, 20 Jul 2015 09:20:37 +0200
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andy Lutomirski <luto@...nel.org>, Dave Hansen <dave@...1.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [GIT PULL] x86 fixes

On Sat, Jul 18, 2015 at 05:18:10AM +0200, Ingo Molnar wrote:
> Linus,
> 
> Please pull the latest x86-urgent-for-linus git tree from:
> 
>    git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86-urgent-for-linus
> 
>    # HEAD: 5aaeb5c01c5b6c0be7b7aadbf3ace9f3a4458c3d x86/fpu, sched: Introduce CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT and use it on x86
> 
> Two families of fixes:
> 
>   - Fix an FPU context related boot crash on newer x86 hardware with larger 
>     context sizes than what most people test. To fix this without ugly kludges or 
>     extensive reverts we had to touch core task allocator, to allow x86 to 
>     determine the task size dynamically, at boot time.
> 
>     I've tested it on a number of x86 platforms, and I cross-built it to a handful 
>     of architectures:
> 
> 	                                 (warns)               (warns)
> 	testing     x86-64:  -git:  pass (    0),  -tip:  pass (    0)
> 	testing     x86-32:  -git:  pass (    0),  -tip:  pass (    0)
> 	testing        arm:  -git:  pass ( 1359),  -tip:  pass ( 1359)
> 	testing       cris:  -git:  pass ( 1031),  -tip:  pass ( 1031)
> 	testing       m32r:  -git:  pass ( 1135),  -tip:  pass ( 1135)
> 	testing       m68k:  -git:  pass ( 1471),  -tip:  pass ( 1471)
> 	testing       mips:  -git:  pass ( 1162),  -tip:  pass ( 1162)
> 	testing    mn10300:  -git:  pass ( 1058),  -tip:  pass ( 1058)
> 	testing     parisc:  -git:  pass ( 1846),  -tip:  pass ( 1846)
> 	testing      sparc:  -git:  pass ( 1185),  -tip:  pass ( 1185)
> 
>      ... so I hope the cross-arch impact 'none', as intended.
> 
>     (by Dave Hansen)

Unfortunately not true. It breaks the build on s390 since a couple of
displacements used in asm code now get too large:

arch/s390/kernel/entry.S:181: Error: operand out of range (0x00000000000018a8 is not between 0x0000000000000000 and 0x0000000000000fff)
arch/s390/kernel/entry.S:191: Error: operand out of range (0x00000000000018a8 is not between 0x0000000000000000 and 0x0000000000000fff)
arch/s390/kernel/entry.S:423: Error: operand out of range (0x0000000000001924 is not between 0x0000000000000000 and 0x0000000000000fff)
arch/s390/kernel/entry.S:437: Error: operand out of range (0x00000000000018e8 is not between 0x0000000000000000 and 0x0000000000000fff)
arch/s390/kernel/entry.S:438: Error: operand out of range (0x00000000000018e0 is not between 0x0000000000000000 and 0x0000000000000fff)
arch/s390/kernel/entry.S:439: Error: operand out of range (0x00000000000018f0 is not between 0x0000000000000000 and 0x0000000000000fff)
make[1]: *** [arch/s390/kernel/entry.o] Error 1

Let's see how we can fix this.

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