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From: Al Viro <viro@zeniv.linux.org.uk>
To: Guenter Roeck <linux@roeck-us.net>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	dri-devel@lists.freedesktop.org, linux-mips@vger.kernel.org,
	"James E.J. Bottomley" <James.Bottomley@hansenpartnership.com>,
	Max Filippov <jcmvbkbc@gmail.com>,
	Paul Mackerras <paulus@samba.org>,
	"H. Peter Anvin" <hpa@zytor.com>,
	sparclinux@vger.kernel.org, ira.weiny@intel.com,
	Dan Williams <dan.j.williams@intel.com>,
	Helge Deller <deller@gmx.de>,
	x86@kernel.org, linux-csky@vger.kernel.org,
	Christoph Hellwig <hch@lst.de>, Ingo Molnar <mingo@redhat.com>,
	linux-snps-arc@lists.infradead.org,
	linux-xtensa@linux-xtensa.org, Borislav Petkov <bp@alien8.de>,
	Andy Lutomirski <luto@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	linux-arm-kernel@lists.infradead.org,
	Chris Zankel <chris@zankel.net>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	linux-parisc@vger.kernel.org, linux-kernel@vger.kernel.org,
	Christian Koenig <christian.koenig@amd.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	linuxppc-dev@lists.ozlabs.org,
	"David S. Miller" <davem@davemloft.net>
Subject: Re: [PATCH] arch/{mips,sparc,microblaze,powerpc}: Don't enable pagefault/preempt twice
Date: Fri, 22 May 2020 01:46:18 +0100	[thread overview]
Message-ID: <20200522004618.GA3151350@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20200521224612.GJ23230@ZenIV.linux.org.uk>

On Thu, May 21, 2020 at 11:46:12PM +0100, Al Viro wrote:
> On Thu, May 21, 2020 at 03:20:46PM -0700, Guenter Roeck wrote:
> > On 5/21/20 10:27 AM, Al Viro wrote:
> > > On Tue, May 19, 2020 at 09:54:22AM -0700, Guenter Roeck wrote:
> > >> On Mon, May 18, 2020 at 11:48:43AM -0700, ira.weiny@intel.com wrote:
> > >>> From: Ira Weiny <ira.weiny@intel.com>
> > >>>
> > >>> The kunmap_atomic clean up failed to remove one set of pagefault/preempt
> > >>> enables when vaddr is not in the fixmap.
> > >>>
> > >>> Fixes: bee2128a09e6 ("arch/kunmap_atomic: consolidate duplicate code")
> > >>> Signed-off-by: Ira Weiny <ira.weiny@intel.com>
> > >>
> > >> microblazeel works with this patch, as do the nosmp sparc32 boot tests,
> > >> but sparc32 boot tests with SMP enabled still fail with lots of messages
> > >> such as:
> > > 
> > > BTW, what's your setup for sparc32 boot tests?  IOW, how do you manage to
> > > shrink the damn thing enough to have the loader cope with it?  I hadn't
> > > been able to do that for the current mainline ;-/
> > > 
> > 
> > defconfig seems to work just fine, even after enabling various debug
> > and file system options.
> 
> The hell?  How do you manage to get the kernel in?  sparc32_defconfig
> ends up with 5316876 bytes unpacked...

Incidentally, trying to load it via -kernel/-initrd leads to
Configuration device id QEMU version 1 machine id 64
Probing SBus slot 0 offset 0
Probing SBus slot 1 offset 0
Probing SBus slot 2 offset 0
Probing SBus slot 3 offset 0
Probing SBus slot 15 offset 0
Invalid FCode start byte
CPUs: 1 x TI,TMS390Z55
UUID: 00000000-0000-0000-0000-000000000000
Welcome to OpenBIOS v1.1 built on Dec 27 2018 19:17
  Type 'help' for detailed information
[sparc] Kernel already loaded
switching to new context:
PROMLIB: obio_ranges 1
PROMLIB: Sun Boot Prom Version 3 Revision 2
Linux version 5.7.0-rc1-00002-gcf51e129b968 (al@duke) (gcc version 6.3.0 20170516 (Debian 6.3.0-18), GNU ld (GNU Binutils for Debian) 2.28) #32 Thu May 21 18:36:07 EDT 2020
printk: bootconsole [earlyprom0] enabled
ARCH: SUN4M
TYPE: Sun4m SparcStation10/20
Ethernet address: 52:54:00:12:34:56
303MB HIGHMEM available.
OF stdout device is: /obio/zs@0,100000:a
PROM: Built device tree with 30051 bytes of memory.
Booting Linux...
Power off control detected.
Kernel panic - not syncing: Failed to allocate memory for percpu areas.
CPU: 0 PID: 0 Comm: swapper Not tainted 5.7.0-rc1-00002-gcf51e129b968 #32
[f04f92a8 : 
setup_per_cpu_areas+0x58/0x90 ] 
[f04edbf4 : 
start_kernel+0xc0/0x4a0 ] 
[f04ed43c : 
continue_boot+0x324/0x334 ] 
[00000000 : 
0x0 ] 

Press Stop-A (L1-A) from sun keyboard or send break
twice on console to return to the boot prom
---[ end Kernel panic - not syncing: Failed to allocate memory for percpu areas. ]---

Giving guest more RAM doesn't change the outcome (well, the number HIGHMEM line is
obviously higher, but that's it).

So which sparc32 kernel have you booted with defconfig and how have you done
that?

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  reply	other threads:[~2020-05-22  0:47 UTC|newest]

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-07 14:59 [PATCH V3 00/15] Remove duplicated kmap code ira.weiny
2020-05-07 14:59 ` [PATCH V3 01/15] arch/kmap: Remove BUG_ON() ira.weiny
2020-05-07 14:59 ` [PATCH V3 02/15] arch/xtensa: Move kmap build bug out of the way ira.weiny
2020-05-07 14:59 ` [PATCH V3 03/15] arch/kmap: Remove redundant arch specific kmaps ira.weiny
2020-05-07 14:59 ` [PATCH V3 04/15] arch/kunmap: Remove duplicate kunmap implementations ira.weiny
2020-05-07 14:59 ` [PATCH V3 05/15] {x86,powerpc,microblaze}/kmap: Move preempt disable ira.weiny
2020-05-07 14:59 ` [PATCH V3 06/15] arch/kmap_atomic: Consolidate duplicate code ira.weiny
2020-05-07 14:59 ` [PATCH V3 07/15] arch/kunmap_atomic: " ira.weiny
2020-05-16 22:33   ` Guenter Roeck
2020-05-18  3:49     ` Ira Weiny
2020-05-18  4:29       ` Guenter Roeck
2020-05-18 18:11         ` Ira Weiny
2020-05-19  0:03         ` Ira Weiny
2020-05-19  2:50           ` Guenter Roeck
2020-05-19 16:29             ` Ira Weiny
2020-05-18 16:11       ` Guenter Roeck
2020-05-18 18:48   ` [PATCH] arch/{mips, sparc, microblaze, powerpc}: Don't enable pagefault/preempt twice ira.weiny
2020-05-19 16:54     ` [PATCH] arch/{mips,sparc,microblaze,powerpc}: " Guenter Roeck
2020-05-19 18:40       ` Ira Weiny
2020-05-19 19:42         ` Guenter Roeck
2020-05-20  5:02           ` Ira Weiny
2020-05-20  5:13           ` Ira Weiny
2020-05-21 16:05             ` Guenter Roeck
2020-05-21 17:42               ` Ira Weiny
2020-05-21 22:27                 ` Guenter Roeck
2020-05-21 22:36                   ` Weiny, Ira
2020-06-03 20:57                 ` Andrew Morton
2020-06-03 21:14                   ` Ira Weiny
2020-06-03 23:44                     ` Guenter Roeck
2020-06-04  6:18                       ` Mike Rapoport
2020-06-04  6:43                         ` Ira Weiny
2020-06-04  6:22                       ` Ira Weiny
2020-06-04  6:37                         ` Mike Rapoport
2020-06-04  6:44                           ` Ira Weiny
2020-06-04  9:38                         ` Guenter Roeck
2020-06-04  9:41                       ` Mike Rapoport
2020-06-04 20:51                         ` Ira Weiny
2020-05-21 15:14           ` Ira Weiny
2020-05-21 17:27       ` Al Viro
2020-05-21 22:20         ` Guenter Roeck
2020-05-21 22:46           ` Al Viro
2020-05-22  0:46             ` Al Viro [this message]
2020-05-22  1:11               ` Guenter Roeck
2020-05-22  1:29                 ` Al Viro
2020-05-22  1:35                   ` Al Viro
2020-05-22  2:28                     ` Guenter Roeck
2020-05-07 14:59 ` [PATCH V3 08/15] arch/kmap: Ensure kmap_prot visibility ira.weiny
2020-05-07 14:59 ` [PATCH V3 09/15] arch/kmap: Don't hard code kmap_prot values ira.weiny
2020-05-07 14:59 ` [PATCH V3 10/15] arch/kmap: Define kmap_atomic_prot() for all arch's ira.weiny
2020-05-17 17:37   ` Guenter Roeck
2020-05-18 18:17     ` Ira Weiny
2020-05-07 14:59 ` [PATCH V3 11/15] drm: Remove drm specific kmap_atomic code ira.weiny
2020-05-07 15:00 ` [PATCH V3 12/15] kmap: Remove kmap_atomic_to_page() ira.weiny
2020-05-07 15:00 ` [PATCH V3 13/15] parisc/kmap: Remove duplicate kmap code ira.weiny
2020-05-07 20:52   ` Andrew Morton
2020-05-07 22:50     ` Ira Weiny
2020-05-07 15:00 ` [PATCH V3 14/15] sparc: Remove unnecessary includes ira.weiny
2020-05-07 15:00 ` [PATCH V3 15/15] kmap: Consolidate kmap_prot definitions ira.weiny
2020-05-07 20:53   ` Andrew Morton
2020-05-07 22:51     ` Ira Weiny
2020-05-07 22:52   ` [PATCH V3.1] " ira.weiny

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