]> git.karo-electronics.de Git - linux-beck.git/commit
MIPS: tlb-r4k: If there are wired entries, don't use TLBINVF
authorMatt Redfearn <matt.redfearn@imgtec.com>
Tue, 20 Sep 2016 08:47:25 +0000 (09:47 +0100)
committerRalf Baechle <ralf@linux-mips.org>
Tue, 4 Oct 2016 23:31:20 +0000 (01:31 +0200)
commite710d6668309d227cc7a46e9c222d97d4a502b9e
treee23ef0deba73c43be007abbcbc4444c4dfa1a2e7
parentb2ff71718e6025fed33a693a1772e2ed39f25d6c
MIPS: tlb-r4k: If there are wired entries, don't use TLBINVF

When adding a wired entry to the TLB via add_wired_entry, the tlb is
flushed with local_flush_tlb_all, which on CPUs with TLBINV results in
the new wired entry being flushed again.

Behavior of the TLBINV instruction applies to all applicable TLB entries
and is unaffected by the setting of the Wired register. Therefore if
the TLB has any wired entries, fall back to iterating over the entries
rather than blasting them all using TLBINVF.

Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Ohad Ben-Cohen <ohad@wizery.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: lisa.parratt@imgtec.com
Cc: Hugh Dickins <hughd@google.com>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mips@linux-mips.org
Cc: linux-remoteproc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/14283/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
arch/mips/mm/tlb-r4k.c