From: Mike Rapoport <rppt@kernel.org>
To: "Edgecombe, Rick P" <rick.p.edgecombe@intel.com>
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Subject: Re: [PATCH 4/4] arch, mm: make kernel_page_present() always available
Date: Mon, 26 Oct 2020 11:31:10 +0200 [thread overview]
Message-ID: <20201026093110.GC1154158@kernel.org> (raw)
In-Reply-To: <979889bf987fdc7268a973fe7398198bfad1644f.camel@intel.com>
On Mon, Oct 26, 2020 at 12:54:01AM +0000, Edgecombe, Rick P wrote:
> On Sun, 2020-10-25 at 12:15 +0200, Mike Rapoport wrote:
> > index 7f248fc45317..16f878c26667 100644
> > --- a/arch/x86/mm/pat/set_memory.c
> > +++ b/arch/x86/mm/pat/set_memory.c
> > @@ -2228,7 +2228,6 @@ void __kernel_map_pages(struct page *page, int
> > numpages, int enable)
> > }
> > #endif /* CONFIG_DEBUG_PAGEALLOC */
> >
> > -#ifdef CONFIG_HIBERNATION
> > bool kernel_page_present(struct page *page)
> > {
> > unsigned int level;
> > @@ -2240,7 +2239,6 @@ bool kernel_page_present(struct page *page)
> > pte = lookup_address((unsigned long)page_address(page),
> > &level);
> > return (pte_val(*pte) & _PAGE_PRESENT);
> > }
> > -#endif /* CONFIG_HIBERNATION */
>
> This is only used by hibernate today right? Makes sense that it should
> return a correct answer if someone starts to use it without looking too
> closely at the header. But could we just remove the default static
> inline return true implementation and let the linker fail if someone
> starts to use it outside hibernate? Then we could leave it compiled out
> until then.
Hmm, I'm not sure I follow you here.
We'd need some stub for architectures that have
ARCH_HIBERNATION_POSSIBLE and do not have
CONFIG_ARCH_HAS_SET_DIRECT_MAP.
I don't see how the kernel would compile for ppc or sparc with
hibernation enabled if I remove the default implementation.
> Also it looks like riscv does not have ARCH_HIBERNATION_POSSIBLE so the
> new function added here couldn't be used yet. You could also just let
> the linker catch it if riscv ever enables hibernate?
--
Sincerely yours,
Mike.
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next prev parent reply other threads:[~2020-10-26 9:31 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-25 10:15 [PATCH 0/4] arch, mm: improve robustness of direct map manipulation Mike Rapoport
2020-10-25 10:15 ` [PATCH 1/4] mm: introduce debug_pagealloc_map_pages() helper Mike Rapoport
2020-10-26 11:05 ` David Hildenbrand
2020-10-26 11:54 ` Mike Rapoport
2020-10-26 11:55 ` David Hildenbrand
2020-10-25 10:15 ` [PATCH 2/4] PM: hibernate: improve robustness of mapping pages in the direct map Mike Rapoport
2020-10-26 0:38 ` Edgecombe, Rick P
2020-10-26 9:15 ` Mike Rapoport
2020-10-26 18:57 ` Edgecombe, Rick P
2020-10-27 8:49 ` Mike Rapoport
2020-10-27 22:44 ` Edgecombe, Rick P
2020-10-28 9:41 ` Mike Rapoport
2020-10-27 1:10 ` Edgecombe, Rick P
2020-10-28 21:15 ` Edgecombe, Rick P
2020-10-29 7:54 ` Mike Rapoport
2020-10-29 23:19 ` Edgecombe, Rick P
2020-11-01 17:02 ` Mike Rapoport
2020-10-25 10:15 ` [PATCH 3/4] arch, mm: restore dependency of __kernel_map_pages() of DEBUG_PAGEALLOC Mike Rapoport
2020-10-25 10:15 ` [PATCH 4/4] arch, mm: make kernel_page_present() always available Mike Rapoport
2020-10-26 0:54 ` Edgecombe, Rick P
2020-10-26 9:31 ` Mike Rapoport [this message]
2020-10-26 1:13 ` [PATCH 0/4] arch, mm: improve robustness of direct map manipulation Edgecombe, Rick P
2020-10-26 9:05 ` Mike Rapoport
2020-10-26 18:05 ` Edgecombe, Rick P
2020-10-27 8:38 ` Mike Rapoport
2020-10-27 8:46 ` David Hildenbrand
2020-10-27 9:47 ` Mike Rapoport
2020-10-27 10:34 ` David Hildenbrand
2020-10-28 11:09 ` Mike Rapoport
2020-10-28 11:17 ` David Hildenbrand
2020-10-28 12:22 ` Mike Rapoport
2020-10-28 18:31 ` Edgecombe, Rick P
2020-10-28 11:20 ` Will Deacon
2020-10-28 11:30 ` Mike Rapoport
2020-10-28 21:03 ` Edgecombe, Rick P
2020-10-29 8:12 ` Mike Rapoport
2020-10-29 23:19 ` Edgecombe, Rick P
2020-10-29 8:15 ` David Hildenbrand
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