Date: Sat, 27 Jun 2020 19:02:39 -0500 From: "Brandon Bergren" <bdragon@FreeBSD.org> To: "Mark Millard" <marklmi@yahoo.com>, "Justin Hibbits" <chmeeedalf@gmail.com> Cc: "FreeBSD PowerPC ML" <freebsd-ppc@freebsd.org> Subject: =?UTF-8?Q?Re:_svn_commit:_r360233_-_in_head:_contrib/jemalloc_._._._:_Th?= =?UTF-8?Q?is_partially_breaks_a_2-socket_32-bit_powerpc_(old_PowerMac_G?= =?UTF-8?Q?4)_based_on_head_-r360311?= Message-ID: <db7d1e5c-06e9-4073-9e4f-876649eb0795@www.fastmail.com> In-Reply-To: <45988F4F-56D0-4FDD-90C9-97570B2F0FCF@yahoo.com> References: <C24EE1A1-FAED-42C2-8204-CA7B1D20A369@yahoo.com> <18E62746-80DB-4195-977D-4FF32D0129EE@yahoo.com> <F5953A6B-56CE-4D1C-8C18-58D44B639881@yahoo.com> <D0C483E5-3F6A-4816-A6BA-3D2C82C24F8E@yahoo.com> <C440956F-139E-4EF7-A68E-FE35D9934BD3@yahoo.com> <9562EEE4-62EF-4164-91C0-948CC0432984@yahoo.com> <9B68839B-AEC8-43EE-B3B6-B696A4A57DAE@yahoo.com> <359C9C7D-4106-42B5-AAB5-08EF995B8100@yahoo.com> <20200513105632.06db9e21@titan.knownspace> <B1225914-43BC-44EF-A73E-D06B890229C6@yahoo.com> <20200611155545.55526f7c@ralga.knownspace> <5542B85D-1C3A-41D8-98CE-3C02E990C3EB@yahoo.com> <20200611164216.47f82775@ralga.knownspace> <DEA9A860-5DEE-49EE-97F1-DBDB39D5C0A3@yahoo.com> <DCB0BC72-1666-49F3-A838-B2A0D653A0C2@yahoo.com> <20200611212532.59f677be@ralga.knownspace> <1EDCA498-0B67-4374-B7CA-1ECDA8EE32AD@yahoo.com> <3605089E-7B5D-4FBA-B0D1-14B789BDF09B@yahoo.com> <CE56E7B6-7189-41BD-9384-6E492FEA85F3@yahoo.com> <F27CB198-2169-4FB2-AA67-F8244C7D39C5@yahoo.com> <20200616213205.05f365dd@titan.knownspace> <E1B78D50-D62E-43A1-9360-8C9F4B32A50F@yahoo.com> <45988F4F-56D0-4FDD-90C9-97570B2F0FCF@yahoo.com>
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On Sat, Jun 27, 2020, at 5:32 PM, Mark Millard wrote:
> where moea64_pvo_remove_from_page involves
> vm_page_aflag_clear(????,PGA_WRITEABLE | PGA_EXECUTABLE) via:
>
> static inline void
> moea64_pvo_remove_from_page_locked(mmu_t mmu, struct pvo_entry *pvo,
> vm_page_t m)
> {
>
> . . .
> /*
> * Update vm about page writeability/executability if managed
> */
> PV_LOCKASSERT(pvo->pvo_pte.pa & LPTE_RPGN);
> if (pvo->pvo_vaddr & PVO_MANAGED) {
> if (m != NULL) {
> LIST_REMOVE(pvo, pvo_vlink);
> if (LIST_EMPTY(vm_page_to_pvoh(m)))
> vm_page_aflag_clear(m,
> PGA_WRITEABLE | PGA_EXECUTABLE);
> }
> }
> . . .
> }
>
> But 32-bit has/uses:
>
> static void mmu_null_remove_pages(mmu_t mmu, pmap_t pmap)
> {
> return;
> }
>
>
> so it does not involve:
>
> vm_page_aflag_clear(????,PGA_WRITEABLE | PGA_EXECUTABLE)
>
> but apparently should involve such in order to pass:
>
> KASSERT((m->a.flags & (PGA_EXECUTABLE | PGA_WRITEABLE)) == 0,
> ("vm_page_free_prep: mapping flags set in page %p", m));
>
looking at the history of the 64 bit code:
r233017 -- "Implement pmap_remove_pages(). This will be added later to the 32-bit MMU module."
Oops!
--
Brandon Bergren
bdragon@FreeBSD.org
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