From: Michael Ellerman <mpe@ellerman.id.au>
To: Steven Price <steven.price@arm.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org
Cc: "Steven Price" <steven.price@arm.com>,
"Andy Lutomirski" <luto@kernel.org>,
"Ard Biesheuvel" <ard.biesheuvel@linaro.org>,
"Arnd Bergmann" <arnd@arndb.de>, "Borislav Petkov" <bp@alien8.de>,
"Catalin Marinas" <catalin.marinas@arm.com>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"Ingo Molnar" <mingo@redhat.com>,
"James Morse" <james.morse@arm.com>,
"Jérôme Glisse" <jglisse@redhat.com>,
"Peter Zijlstra" <peterz@infradead.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Will Deacon" <will@kernel.org>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org,
"Mark Rutland" <Mark.Rutland@arm.com>,
"Liang, Kan" <kan.liang@linux.intel.com>,
"Benjamin Herrenschmidt" <benh@kernel.crashing.org>,
"Paul Mackerras" <paulus@samba.org>,
linuxppc-dev@lists.ozlabs.org, kvm-ppc@vger.kernel.org
Subject: Re: [PATCH v17 06/23] powerpc: mm: Add p?d_leaf() definitions
Date: Thu, 19 Dec 2019 22:49:16 +1100 [thread overview]
Message-ID: <877e2smt6r.fsf@mpe.ellerman.id.au> (raw)
In-Reply-To: <20191218162402.45610-7-steven.price@arm.com>
Steven Price <steven.price@arm.com> writes:
> walk_page_range() is going to be allowed to walk page tables other than
> those of user space. For this it needs to know when it has reached a
> 'leaf' entry in the page tables. This information is provided by the
> p?d_leaf() functions/macros.
>
> For powerpc p?d_is_leaf() functions already exist. Export them using the
> new p?d_leaf() name.
>
> CC: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> CC: Paul Mackerras <paulus@samba.org>
> CC: Michael Ellerman <mpe@ellerman.id.au>
> CC: linuxppc-dev@lists.ozlabs.org
> CC: kvm-ppc@vger.kernel.org
> Signed-off-by: Steven Price <steven.price@arm.com>
> ---
> arch/powerpc/include/asm/book3s/64/pgtable.h | 3 +++
> 1 file changed, 3 insertions(+)
We have fallback versions of our pmd_is_leaf() etc. in
arch/powerpc/include/asm/pgtable.h, eg:
#ifndef pmd_is_leaf
#define pmd_is_leaf pmd_is_leaf
static inline bool pmd_is_leaf(pmd_t pmd)
{
return false;
}
#endif
Because we support several different MMUs and most of them don't need to
do anything.
So we could put the compatibility #defines to your names along with the
fallback versions in asm/pgtable.h, rather than in
asm/book3s/64/pgtable.h
But I see you also have fallbacks for your versions, so it probably
doesn't matter either way.
So I'm OK with this version, unless you think there's a compelling
reason to do the compatibility #defines in our asm/pgtable.h
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
cheers
> diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
> index b01624e5c467..201a69e6a355 100644
> --- a/arch/powerpc/include/asm/book3s/64/pgtable.h
> +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
> @@ -1355,18 +1355,21 @@ static inline bool is_pte_rw_upgrade(unsigned long old_val, unsigned long new_va
> * Like pmd_huge() and pmd_large(), but works regardless of config options
> */
> #define pmd_is_leaf pmd_is_leaf
> +#define pmd_leaf pmd_is_leaf
> static inline bool pmd_is_leaf(pmd_t pmd)
> {
> return !!(pmd_raw(pmd) & cpu_to_be64(_PAGE_PTE));
> }
>
> #define pud_is_leaf pud_is_leaf
> +#define pud_leaf pud_is_leaf
> static inline bool pud_is_leaf(pud_t pud)
> {
> return !!(pud_raw(pud) & cpu_to_be64(_PAGE_PTE));
> }
>
> #define pgd_is_leaf pgd_is_leaf
> +#define pgd_leaf pgd_is_leaf
> static inline bool pgd_is_leaf(pgd_t pgd)
> {
> return !!(pgd_raw(pgd) & cpu_to_be64(_PAGE_PTE));
> --
> 2.20.1
next prev parent reply other threads:[~2019-12-19 11:49 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-18 16:23 [PATCH v17 00/23] Generic page walk and ptdump Steven Price
2019-12-18 16:23 ` [PATCH v17 01/23] mm: Add generic p?d_leaf() macros Steven Price
2019-12-19 11:43 ` Michael Ellerman
2019-12-20 11:48 ` Steven Price
2019-12-21 10:35 ` Michael Ellerman
2019-12-18 16:23 ` [PATCH v17 02/23] arc: mm: Add p?d_leaf() definitions Steven Price
2019-12-18 16:23 ` [PATCH v17 03/23] arm: " Steven Price
2019-12-18 16:23 ` [PATCH v17 04/23] arm64: " Steven Price
2019-12-18 16:23 ` [PATCH v17 05/23] mips: " Steven Price
2019-12-18 16:23 ` [PATCH v17 06/23] powerpc: " Steven Price
2019-12-19 11:49 ` Michael Ellerman [this message]
2019-12-20 11:53 ` Steven Price
2019-12-18 16:23 ` [PATCH v17 07/23] riscv: " Steven Price
2019-12-18 16:23 ` [PATCH v17 08/23] s390: " Steven Price
2019-12-18 16:23 ` [PATCH v17 09/23] sparc: " Steven Price
2019-12-18 16:23 ` [PATCH v17 10/23] x86: " Steven Price
2019-12-18 16:23 ` [PATCH v17 11/23] mm: pagewalk: Add p4d_entry() and pgd_entry() Steven Price
2019-12-19 14:25 ` Thomas Hellström (VMware)
2019-12-20 15:35 ` Steven Price
2019-12-18 16:23 ` [PATCH v17 12/23] mm: pagewalk: Allow walking without vma Steven Price
2019-12-18 16:23 ` [PATCH v17 13/23] mm: pagewalk: Don't lock PTEs for walk_page_range_novma() Steven Price
2019-12-18 16:23 ` [PATCH v17 14/23] mm: pagewalk: fix termination condition in walk_pte_range() Steven Price
2019-12-18 16:23 ` [PATCH v17 15/23] mm: pagewalk: Add 'depth' parameter to pte_hole Steven Price
2019-12-18 16:23 ` [PATCH v17 16/23] x86: mm: Point to struct seq_file from struct pg_state Steven Price
2019-12-18 16:23 ` [PATCH v17 17/23] x86: mm+efi: Convert ptdump_walk_pgd_level() to take a mm_struct Steven Price
2019-12-18 16:23 ` [PATCH v17 18/23] x86: mm: Convert ptdump_walk_pgd_level_debugfs() to take an mm_struct Steven Price
2019-12-18 16:23 ` [PATCH v17 19/23] mm: Add generic ptdump Steven Price
2019-12-18 16:23 ` [PATCH v17 20/23] x86: mm: Convert dump_pagetables to use walk_page_range Steven Price
2019-12-18 16:24 ` [PATCH v17 21/23] arm64: mm: Convert mm/dump.c to use walk_page_range() Steven Price
2020-02-16 16:25 ` Ard Biesheuvel
2020-02-17 10:01 ` Steven Price
2020-02-17 10:16 ` Ard Biesheuvel
2019-12-18 16:24 ` [PATCH v17 22/23] arm64: mm: Display non-present entries in ptdump Steven Price
2019-12-18 16:24 ` [PATCH v17 23/23] mm: ptdump: Reduce level numbers by 1 in note_page() Steven Price
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