From: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
To: "Maciej W. Rozycki" <macro@linux-mips.org>,
Zenon Fortuna <zenon.fortuna@imgtec.com>
Cc: "Steven J. Hill" <Steven.Hill@imgtec.com>,
"IMG - MIPS Linux Kernel developers"
<IMG-MIPSLinuxKerneldevelopers@imgtec.com>,
"Linux MIPS Mailing List" <linux-mips@linux-mips.org>
Subject: Re: [PATCH V2 1/3] MIPS: Fix cache flushing for swap pages with non-DMA I/O.
Date: Tue, 24 Feb 2015 13:06:22 -0800 [thread overview]
Message-ID: <54ECE7CE.4040407@imgtec.com> (raw)
In-Reply-To: <alpine.LFD.2.11.1502240224500.17311@eddie.linux-mips.org>
On 02/23/2015 06:33 PM, Maciej W. Rozycki wrote:
> On Mon, 23 Feb 2015, Zenon Fortuna wrote:
>
>> Does the current system-call "cacheflush(2)" works with the newer kernels?
>> As the "man cacheflush" tells, it was supposed to work only on MIPS based
>> systems.
> It absolutely has to work, on the MIPS target GCC emits code invoking it
> to synchronise trampolines built at the run time on the stack (used for
> calling nested functions, a C language extension borrowed from Pascal,
> etc.), before passing execution there. Verification of this syscall is
> probably implicitly covered by the GCC test suite already.
>
> Maciej
cacheflush() syscall traps into kernel and it executes I and D caches
flushing.
However, it's implementation in 'master' branch from Linus tree is
wrong: if you call it in multicore environment for size > L1 cache size
then it does it incorrectly: doesn't call IPI for index cacheops.
The correct way is ... sorry, can't find it in LMO...
- Leonid.
next prev parent reply other threads:[~2015-02-24 21:06 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-19 16:17 [PATCH V2 0/3] HIGHMEM and cache flush fixes Steven J. Hill
2015-02-19 16:17 ` Steven J. Hill
2015-02-19 16:17 ` [PATCH V2 1/3] MIPS: Fix cache flushing for swap pages with non-DMA I/O Steven J. Hill
2015-02-19 16:17 ` Steven J. Hill
2015-02-20 19:17 ` Kevin Cernekee
2015-02-24 0:56 ` Leonid Yegoshin
2015-02-24 1:13 ` Zenon Fortuna
2015-02-24 2:33 ` Maciej W. Rozycki
2015-02-24 21:06 ` Leonid Yegoshin [this message]
2015-02-24 21:51 ` Maciej W. Rozycki
2015-02-24 21:57 ` Leonid Yegoshin
2015-02-24 22:50 ` Maciej W. Rozycki
2015-02-24 22:57 ` David Daney
2015-02-24 23:19 ` Leonid Yegoshin
2015-02-24 23:58 ` David Daney
2015-02-25 0:07 ` Maciej W. Rozycki
2015-02-25 0:38 ` David Daney
2015-02-24 23:15 ` Leonid Yegoshin
2015-02-24 2:24 ` Maciej W. Rozycki
2015-02-24 16:20 ` Steven J. Hill
2015-02-19 16:17 ` [PATCH V2 2/3] MIPS: Highmem: Fixes for cache aliasing and color Steven J. Hill
2015-02-19 16:17 ` Steven J. Hill
2015-02-19 16:17 ` [PATCH V2 3/3] MIPS: Fix I-cache flushing for kmap'd pages Steven J. Hill
2015-02-19 16:17 ` Steven J. Hill
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