linux-kernel - Re: [PATCH 06/16] sh: use the generic get_user_pages

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Message-ID: <20190629151535.GA18067@roeck-us.net>
Date:   Sat, 29 Jun 2019 08:15:35 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Christoph Hellwig <hch@....de>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        "David S. Miller" <davem@...emloft.net>,
        Nicholas Piggin <npiggin@...il.com>,
        Khalid Aziz <khalid.aziz@...cle.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linux-mips@...r.kernel.org, linux-sh@...r.kernel.org,
        sparclinux@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-mm@...ck.org, x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/16] sh: use the generic get_user_pages_fast code

On Tue, Jun 25, 2019 at 04:37:05PM +0200, Christoph Hellwig wrote:
> The sh code is mostly equivalent to the generic one, minus various
> bugfixes and two arch overrides that this patch adds to pgtable.h.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>

sh:defconfig no longer builds with this patch applied.

mm/gup.c: In function 'gup_huge_pud':
arch/sh/include/asm/pgtable-3level.h:40:36: error:
	implicit declaration of function 'pud_pfn'; did you mean 'pte_pfn'? 

Bisect log attached.

Guenter

---
# bad: [48568d8c7f479ec45b9c3d02b4b1895f3ef61a03] Add linux-next specific files for 20190628
# good: [4b972a01a7da614b4796475f933094751a295a2f] Linux 5.2-rc6
git bisect start 'HEAD' 'v5.2-rc6'
# good: [89a77c9176fe88f68c3bf7bd255cfea6797258d4] Merge remote-tracking branch 'crypto/master'
git bisect good 89a77c9176fe88f68c3bf7bd255cfea6797258d4
# good: [2cedca636ad73ed838bd636685b245404e490c73] Merge remote-tracking branch 'security/next-testing'
git bisect good 2cedca636ad73ed838bd636685b245404e490c73
# good: [ea260819fdc2f8a64e6c87f3ad80ecc5e4015921] Merge remote-tracking branch 'char-misc/char-misc-next'
git bisect good ea260819fdc2f8a64e6c87f3ad80ecc5e4015921
# good: [aca42ca2a32eacf804ac56a33526f049debc8ec0] Merge remote-tracking branch 'rpmsg/for-next'
git bisect good aca42ca2a32eacf804ac56a33526f049debc8ec0
# good: [f4cd0c7f3c07876f7173b5306e974644c6eec141] Merge remote-tracking branch 'pidfd/for-next'
git bisect good f4cd0c7f3c07876f7173b5306e974644c6eec141
# bad: [09c57a8ab1fc3474b4a620247a0f9e3ac61c4cfe] mm/sparsemem: support sub-section hotplug
git bisect bad 09c57a8ab1fc3474b4a620247a0f9e3ac61c4cfe
# good: [aaffcf10880c363870413c5cdee5dfb6a923e9ae] mm: memcontrol: dump memory.stat during cgroup OOM
git bisect good aaffcf10880c363870413c5cdee5dfb6a923e9ae
# bad: [81d90bb2d2784258ed7c0762ecf34d4665198bad] um: switch to generic version of pte allocation
git bisect bad 81d90bb2d2784258ed7c0762ecf34d4665198bad
# bad: [dadae650472841f004882a2409aa844e37809c60] sparc64-add-the-missing-pgd_page-definition-fix
git bisect bad dadae650472841f004882a2409aa844e37809c60
# good: [d1edd06c6ac8c8c49345ff34de1c72ee571f3f7b] mm: memcg/slab: stop setting page->mem_cgroup pointer for slab pages
git bisect good d1edd06c6ac8c8c49345ff34de1c72ee571f3f7b
# good: [b1ceaacca9e63794bd3f574c928e7e6aca01bce7] mm: simplify gup_fast_permitted
git bisect good b1ceaacca9e63794bd3f574c928e7e6aca01bce7
# good: [59f238b3353caf43b118e1bb44010aa1abd56d7f] sh: add the missing pud_page definition
git bisect good 59f238b3353caf43b118e1bb44010aa1abd56d7f
# bad: [51bbf54b3f26a85217db720f4e5b01a6c4d3f010] sparc64: add the missing pgd_page definition
git bisect bad 51bbf54b3f26a85217db720f4e5b01a6c4d3f010
# bad: [be748d6e72113580af7e37ad68a0047659e60189] sh: use the generic get_user_pages_fast code
git bisect bad be748d6e72113580af7e37ad68a0047659e60189
# first bad commit: [be748d6e72113580af7e37ad68a0047659e60189] sh: use the generic get_user_pages_fast code