From: Pekka Enberg <penberg@kernel.org>
To: Palmer Dabbelt <palmer@dabbelt.com>
Cc: linux-riscv <linux-riscv@lists.infradead.org>,
Joerg Roedel <jroedel@suse.de>
Subject: vmalloc faulting on RISC-V
Date: Wed, 9 Sep 2020 09:29:10 +0300 [thread overview]
Message-ID: <CAOJsxLFWbV6FoEgHPHVN3PksrP5mXWbbFUuzH8YEDd1VdvEp7g@mail.gmail.com> (raw)
Hello!
Why does RISC-V need vmalloc faulting in do_page_fault()? If I
understand correctly, some architectures implement it because process
page tables can get out of sync with "init_mm.pgd". How does that
happen on RISC-V?
I am asking because Joerg Roedel recently switched the x86
architecture to a different approach because apparently vmalloc
faulting is error-prone:
commit 7f0a002b5a21302d9f4b29ba83c96cd433ff3769
Author: Joerg Roedel <jroedel@suse.de>
Date: Mon Jun 1 21:52:40 2020 -0700
x86/mm: remove vmalloc faulting
Remove fault handling on vmalloc areas, as the vmalloc code now takes
care of synchronizing changes to all page-tables in the system.
If RISC-V has the issue of page tables getting out of sync, I think we
should switch to this approach too.
Regards,
- Pekka
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next reply other threads:[~2020-09-09 6:29 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-09 6:29 Pekka Enberg [this message]
2020-09-09 18:28 ` vmalloc faulting on RISC-V Joerg Roedel
2020-09-09 20:35 ` Palmer Dabbelt
2020-09-18 12:08 ` Joerg Roedel
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