| Message ID | 1474361249-31064-3-git-send-email-matt.redfearn@imgtec.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
On Tue, Sep 20, 2016 at 09:47:25AM +0100, Matt Redfearn wrote: > 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> Queued for 4.9.. Ralf -- To unsubscribe from this list: send the line "unsubscribe linux-remoteproc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/arch/mips/mm/tlb-r4k.c b/arch/mips/mm/tlb-r4k.c index e8b335c16295..4953c1a8cdfd 100644 --- a/arch/mips/mm/tlb-r4k.c +++ b/arch/mips/mm/tlb-r4k.c @@ -67,8 +67,11 @@ void local_flush_tlb_all(void) entry = read_c0_wired(); - /* Blast 'em all away. */ - if (cpu_has_tlbinv) { + /* + * Blast 'em all away. + * If there are any wired entries, fall back to iterating + */ + if (cpu_has_tlbinv && !entry) { if (current_cpu_data.tlbsizevtlb) { write_c0_index(0); mtc0_tlbw_hazard();
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> --- Changes in v2: None arch/mips/mm/tlb-r4k.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)