From: David Hildenbrand <david@redhat.com>
To: linux-mm@kvack.org
Cc: Mark Rutland <mark.rutland@arm.com>,
Michal Hocko <mhocko@suse.com>,
David Hildenbrand <david@redhat.com>,
David Airlie <airlied@linux.ie>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Bhupesh Sharma <bhsharma@redhat.com>,
Palmer Dabbelt <palmer@sifive.com>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Michal Hocko <mhocko@kernel.org>,
Paul Mackerras <paulus@samba.org>,
linux-riscv@lists.infradead.org,
Alexander Duyck <alexander.h.duyck@linux.intel.com>,
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Michael Ellerman <mpe@ellerman.id.au>,
Pavel Tatashin <pasha.tatashin@oracle.com>,
Matthew Wilcox <willy@infradead.org>,
Geert Uytterhoeven <geert@linux-m68k.org>,
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linuxppc-dev@lists.ozlabs.org
Subject: [PATCH RFC 0/7] mm: PG_reserved cleanups and documentation
Date: Wed, 5 Dec 2018 13:28:44 +0100 [thread overview]
Message-ID: <20181205122851.5891-1-david@redhat.com> (raw)
I was recently going over all users of PG_reserved. Short story: it is
difficult and sometimes not really clear if setting/checking for
PG_reserved is only a relict from the past. Easy to break things.
I had way more cleanups in this series inititally,
but some architectures take PG_reserved as a way to apply a different
caching strategy (for MMIO pages). So I decided to only include the most
obvious changes (that are less likely to break something).
So let's see if the documentation update for PG_reserved I crafted
actually covers most cases or if there is plenty more.
Most notably, for device memory we can hopefully soon stop setting
it PG_reserved
I only briefly tested this on s390x.
David Hildenbrand (7):
agp: efficeon: no need to set PG_reserved on GATT tables
s390/vdso: don't clear PG_reserved
powerpc/vdso: don't clear PG_reserved
riscv/vdso: don't clear PG_reserved
m68k/mm: use __ClearPageReserved()
arm64: kexec: no need to ClearPageReserved()
mm: better document PG_reserved
arch/arm64/kernel/machine_kexec.c | 1 -
arch/m68k/mm/memory.c | 2 +-
arch/powerpc/kernel/vdso.c | 2 --
arch/riscv/kernel/vdso.c | 1 -
arch/s390/kernel/vdso.c | 2 --
drivers/char/agp/efficeon-agp.c | 2 --
include/linux/page-flags.h | 18 ++++++++++++++++--
7 files changed, 17 insertions(+), 11 deletions(-)
--
2.17.2
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next reply other threads:[~2018-12-05 12:29 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-05 12:28 David Hildenbrand [this message]
2018-12-05 12:28 ` [PATCH RFC 1/7] agp: efficeon: no need to set PG_reserved on GATT tables David Hildenbrand
2018-12-05 12:28 ` [PATCH RFC 2/7] s390/vdso: don't clear PG_reserved David Hildenbrand
2018-12-05 12:28 ` [PATCH RFC 3/7] powerpc/vdso: " David Hildenbrand
2018-12-05 12:28 ` [PATCH RFC 4/7] riscv/vdso: " David Hildenbrand
2018-12-07 18:45 ` Palmer Dabbelt
2018-12-05 12:28 ` [PATCH RFC 5/7] m68k/mm: use __ClearPageReserved() David Hildenbrand
2018-12-05 12:28 ` [PATCH RFC 6/7] arm64: kexec: no need to ClearPageReserved() David Hildenbrand
2018-12-05 14:00 ` James Morse
2018-12-05 12:28 ` [PATCH RFC 7/7] mm: better document PG_reserved David Hildenbrand
2018-12-05 12:59 ` Michal Hocko
2018-12-05 14:35 ` Matthew Wilcox
2018-12-05 15:05 ` David Hildenbrand
2018-12-05 17:32 ` Matthew Wilcox
2018-12-05 18:13 ` David Hildenbrand
2018-12-06 10:46 ` David Hildenbrand
2018-12-05 12:56 ` [PATCH RFC 0/7] mm: PG_reserved cleanups and documentation Michal Hocko
2018-12-05 13:04 ` David Hildenbrand
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