| Message ID | 20210307190806.5211-1-ilya.lipnitskiy@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | MIPS: ralink: select WEAK_REORDERING_BEYOND_LLSC on MT7621 | expand |
On Sun, Mar 07, 2021 at 11:08:06AM -0800, Ilya Lipnitskiy wrote: > Upstream a long-standing OpenWrt patch for RALINK MT7621 SoC. Selecting > WEAK_REORDERING_BEYOND_LLSC fixes random kernel hangs. This bug and fix > was reported by MediaTek WCN division [0]. > > [0]: https://lists.infradead.org/pipermail/lede-commits/2017-August/004537.html I don't see the Mediatek WCN reporting there. Looking at the 1004K user manual I couldn't find a notice about such behaviour. So this looks more like a fix for papering over the real bug by just introducing a few more syncs. Could you please point me to where this is really documented ? Thomas.
Hi Thomas, On Fri, Mar 12, 2021 at 2:34 AM Thomas Bogendoerfer <tsbogend@alpha.franken.de> wrote: > > On Sun, Mar 07, 2021 at 11:08:06AM -0800, Ilya Lipnitskiy wrote: > > Upstream a long-standing OpenWrt patch for RALINK MT7621 SoC. Selecting > > WEAK_REORDERING_BEYOND_LLSC fixes random kernel hangs. This bug and fix > > was reported by MediaTek WCN division [0]. > > > > [0]: https://lists.infradead.org/pipermail/lede-commits/2017-August/004537.html > > I don't see the Mediatek WCN reporting there. Looking at the 1004K user > manual I couldn't find a notice about such behaviour. So this looks > more like a fix for papering over the real bug by just introducing > a few more syncs. Could you please point me to where this is > really documented ? You may actually be right. After doing some testing we may not need this change after all. Let me drop this patch for now. FYI, the following commit may have fixed LL SC issues this change was covering up: https://lore.kernel.org/lkml/20190613134933.048961704@infradead.org/ > > Thomas. > > -- > Crap can work. Given enough thrust pigs will fly, but it's not necessarily a > good idea. [ RFC1925, 2.3 ] Ilya
diff --git a/arch/mips/ralink/Kconfig b/arch/mips/ralink/Kconfig index c20c44788b62..31671bbf26ff 100644 --- a/arch/mips/ralink/Kconfig +++ b/arch/mips/ralink/Kconfig @@ -62,6 +62,7 @@ choice select CLKSRC_MIPS_GIC select HAVE_PCI if PCI_MT7621 select SOC_BUS + select WEAK_REORDERING_BEYOND_LLSC endchoice choice
Upstream a long-standing OpenWrt patch for RALINK MT7621 SoC. Selecting WEAK_REORDERING_BEYOND_LLSC fixes random kernel hangs. This bug and fix was reported by MediaTek WCN division [0]. [0]: https://lists.infradead.org/pipermail/lede-commits/2017-August/004537.html Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com> Cc: linux-mediatek@lists.infradead.org Cc: linux-mips@vger.kernel.org Cc: linux-kernel@vger.kernel.org --- arch/mips/ralink/Kconfig | 1 + 1 file changed, 1 insertion(+)