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From: David Miller <davem@davemloft.net>
To: ldv@altlinux.org
Cc: hch@lst.de, khalid.aziz@oracle.com,
	torvalds@linux-foundation.org, akpm@linux-foundation.org,
	matorola@gmail.com, sparclinux@vger.kernel.org,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 09/16] sparc64: use the generic get_user_pages_fast code
Date: Thu, 18 Jul 2019 14:14:05 -0700 (PDT)	[thread overview]
Message-ID: <20190718.141405.1070121094691581998.davem@davemloft.net> (raw)
In-Reply-To: <20190717215956.GA30369@altlinux.org>

From: "Dmitry V. Levin" <ldv@altlinux.org>
Date: Thu, 18 Jul 2019 00:59:56 +0300

> So this ended up as commit 7b9afb86b6328f10dc2cad9223d7def12d60e505
> (thanks to Anatoly for bisecting) and introduced a regression: 
> futex.test from the strace test suite now causes an Oops on sparc64
> in futex syscall.
> 
> Here is a heavily stripped down reproducer:

Does not reproduce for me on a T4-2 machine.

So this problem might depend on the type of system you are on,
I suspect it's one of those "pre-Niagara vs. Niagara and later"
situations because that's the dividing line between two set of
wildly different TLB and cache management methods.

What kind of machine are you on?

  parent reply	other threads:[~2019-07-18 21:14 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-25 14:36 switch the remaining architectures to use generic GUP v4 Christoph Hellwig
2019-06-25 14:37 ` [PATCH 01/16] mm: use untagged_addr() for get_user_pages_fast addresses Christoph Hellwig
2019-06-25 14:37 ` [PATCH 02/16] mm: simplify gup_fast_permitted Christoph Hellwig
2019-06-25 14:37 ` [PATCH 03/16] mm: lift the x86_32 PAE version of gup_get_pte to common code Christoph Hellwig
2019-06-25 14:37 ` [PATCH 04/16] MIPS: use the generic get_user_pages_fast code Christoph Hellwig
2019-06-29 14:37   ` Guenter Roeck
2019-06-25 14:37 ` [PATCH 05/16] sh: add the missing pud_page definition Christoph Hellwig
2019-06-25 14:37 ` [PATCH 06/16] sh: use the generic get_user_pages_fast code Christoph Hellwig
2019-06-29 15:15   ` Guenter Roeck
2019-06-25 14:37 ` [PATCH 07/16] sparc64: add the missing pgd_page definition Christoph Hellwig
2019-06-25 14:37 ` [PATCH 08/16] sparc64: define untagged_addr() Christoph Hellwig
2019-06-25 14:37 ` [PATCH 09/16] sparc64: use the generic get_user_pages_fast code Christoph Hellwig
2019-07-17 21:59   ` Dmitry V. Levin
2019-07-17 22:04     ` Linus Torvalds
2019-07-17 23:30       ` Dmitry V. Levin
2019-07-18  0:17         ` Linus Torvalds
2019-07-18  1:21           ` David Miller
2019-07-18 21:43           ` David Miller
2019-07-18 21:14     ` David Miller [this message]
2019-07-19  6:00       ` Christoph Hellwig
2019-07-24 19:32       ` Anatoly Pugachev
2019-07-24 20:13         ` David Miller
2019-07-25 18:33           ` Anatoly Pugachev
2019-07-25 22:52             ` David Miller
2019-07-28  2:09             ` David Miller
2019-07-28 20:00               ` Anatoly Pugachev
2019-07-26 17:58     ` Khalid Aziz
2019-08-09 19:59     ` Anatoly Pugachev
2019-08-10  7:17       ` Christoph Hellwig
2019-08-10 19:36         ` Mikael Pettersson
2019-08-11 20:30           ` Anatoly Pugachev
2019-06-25 14:37 ` [PATCH 10/16] mm: rename CONFIG_HAVE_GENERIC_GUP to CONFIG_HAVE_FAST_GUP Christoph Hellwig
2019-06-25 14:37 ` [PATCH 11/16] mm: reorder code blocks in gup.c Christoph Hellwig
2019-06-25 14:37 ` [PATCH 12/16] mm: consolidate the get_user_pages* implementations Christoph Hellwig
2019-06-25 14:37 ` [PATCH 13/16] mm: validate get_user_pages_fast flags Christoph Hellwig
2019-06-25 14:37 ` [PATCH 14/16] mm: move the powerpc hugepd code to mm/gup.c Christoph Hellwig
2019-06-25 19:37   ` Andrew Morton
2019-06-26  5:49     ` Christoph Hellwig
2019-06-25 14:37 ` [PATCH 15/16] mm: switch gup_hugepte to use try_get_compound_head Christoph Hellwig
2019-06-25 14:37 ` [PATCH 16/16] mm: mark the page referenced in gup_hugepte Christoph Hellwig
  -- strict thread matches above, loose matches on Subject: below --
2019-06-11 14:40 switch the remaining architectures to use generic GUP v3 Christoph Hellwig
2019-06-11 14:40 ` [PATCH 09/16] sparc64: use the generic get_user_pages_fast code Christoph Hellwig
2019-06-11 19:35   ` Khalid Aziz

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