From: Greg Kroah-Hartman gregkh@linuxfoundation.org
This reverts commit 9547d81ac3bc0d2b9729a28e7dd610007144a837 which is commit a1e8783db8e0d58891681bc1e6d9ada66eae8e20 upstream.
Petr writes: Karl has reported to me today, that he's experiencing weird reboot hang on his devices with 4.9.180 kernel and that he has bisected it down to my backported patch.
I would like to kindly ask you for removal of this patch. This patch should be reverted from all stable kernels up to 5.1, because perf counters were not broken on those kernels, and this patch won't work on the ath79 legacy IRQ code anyway, it needs new irqchip driver which was enabled on ath79 with commit 51fa4f8912c0 ("MIPS: ath79: drop legacy IRQ code").
Reported-by: Petr Štetiar ynezz@true.cz Cc: Kevin 'ldir' Darbyshire-Bryant ldir@darbyshire-bryant.me.uk Cc: John Crispin john@phrozen.org Cc: Marc Zyngier marc.zyngier@arm.com Cc: Paul Burton paul.burton@mips.com Cc: linux-mips@vger.kernel.org Cc: Ralf Baechle ralf@linux-mips.org Cc: James Hogan jhogan@kernel.org Cc: Thomas Gleixner tglx@linutronix.de Cc: Jason Cooper jason@lakedaemon.net Cc: Sasha Levin sashal@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/mips/ath79/setup.c | 6 ++++++ drivers/irqchip/irq-ath79-misc.c | 11 ----------- 2 files changed, 6 insertions(+), 11 deletions(-)
--- a/arch/mips/ath79/setup.c +++ b/arch/mips/ath79/setup.c @@ -183,6 +183,12 @@ const char *get_system_type(void) return ath79_sys_type; }
+int get_c0_perfcount_int(void) +{ + return ATH79_MISC_IRQ(5); +} +EXPORT_SYMBOL_GPL(get_c0_perfcount_int); + unsigned int get_c0_compare_int(void) { return CP0_LEGACY_COMPARE_IRQ; --- a/drivers/irqchip/irq-ath79-misc.c +++ b/drivers/irqchip/irq-ath79-misc.c @@ -22,15 +22,6 @@ #define AR71XX_RESET_REG_MISC_INT_ENABLE 4
#define ATH79_MISC_IRQ_COUNT 32 -#define ATH79_MISC_PERF_IRQ 5 - -static int ath79_perfcount_irq; - -int get_c0_perfcount_int(void) -{ - return ath79_perfcount_irq; -} -EXPORT_SYMBOL_GPL(get_c0_perfcount_int);
static void ath79_misc_irq_handler(struct irq_desc *desc) { @@ -122,8 +113,6 @@ static void __init ath79_misc_intc_domai { void __iomem *base = domain->host_data;
- ath79_perfcount_irq = irq_create_mapping(domain, ATH79_MISC_PERF_IRQ); - /* Disable and clear all interrupts */ __raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_ENABLE); __raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_STATUS);