kernel: Make the patches apply on top of 4.19

This makes the patches which were just copied in the previous commit
apply on top of kernel 4.19.

The patches in the backports-4.19 folder were checked if they are really
in kernel 4.19 based on the title and only removed if they were found in
the upstream kernel.

The following additional patches form the pending folder went into
upstream Linux 4.19:
pending-4.19/171-usb-dwc2-Fix-inefficient-copy-of-unaligned-buffers.patch
pending-4.19/190-2-5-e1000e-Fix-wrong-comment-related-to-link-detection.patch
pending-4.19/478-mtd-spi-nor-Add-support-for-XM25QH64A-and-XM25QH128A.patch
pending-4.19/479-mtd-spi-nor-add-eon-en25qh32.patch
pending-4.19/950-tty-serial-exar-generalize-rs485-setup.patch
pending-4.19/340-MIPS-mm-remove-mips_dma_mapping_error.patch

Bigger changes were introduced to the m25p80 spi nor driver, as far as I
saw it in the new code, it now has the functionality provided in this
patch:
pending-4.19/450-mtd-m25p80-allow-fallback-from-spi_flash_read-to-reg.patch

Part of this patch went upstream independent of OpenWrt:
hack-4.19/220-gc_sections.patch
This patch was reworked to match the changes done upstream.

The MIPS DMA API changed a lot, this patch was rewritten to match the
new DMA handling:
pending-4.19/341-MIPS-mm-remove-no-op-dma_map_ops-where-possible.patch

I did bigger manual changes to the following patches and I am not 100% sure if they are all correct:
pending-4.19/0931-w1-gpio-fix-problem-with-platfom-data-in-w1-gpio.patch
pending-4.19/411-mtd-partial_eraseblock_write.patch
pending-4.19/600-netfilter_conntrack_flush.patch
pending-4.19/611-netfilter_match_bypass_default_table.patch
pending-4.19/670-ipv6-allow-rejecting-with-source-address-failed-policy.patch
hack-4.19/211-host_tools_portability.patch
hack-4.19/221-module_exports.patch
hack-4.19/321-powerpc_crtsavres_prereq.patch
hack-4.19/902-debloat_proc.patch

This is based on patchset from Marko Ratkaj <marko.ratkaj@sartura.hr>

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

1 files changed, 51 insertions, 109 deletions

diff --git a/target/linux/generic/pending-4.19/341-MIPS-mm-remove-no-op-dma_map_ops-where-possible.patch b/target/linux/generic/pending-4.19/341-MIPS-mm-remove-no-op-dma_map_ops-where-possible.patch
index de2dd65b17..44d1520639 100644
--- a/target/linux/generic/pending-4.19/341-MIPS-mm-remove-no-op-dma_map_ops-where-possible.patch
+++ b/target/linux/generic/pending-4.19/341-MIPS-mm-remove-no-op-dma_map_ops-where-possible.patch
@@ -1,140 +1,82 @@
-From: Felix Fietkau <nbd@nbd.name>
-Date: Tue, 5 Dec 2017 12:46:01 +0100
-Subject: [PATCH] MIPS: mm: remove no-op dma_map_ops where possible
+From 203f17906ff45705fbdaa0430dbbc71142c2640f Mon Sep 17 00:00:00 2001
+From: Hauke Mehrtens <hauke@hauke-m.de>
+Date: Sat, 8 Dec 2018 21:45:53 +0100
+Subject: [PATCH 1/3] MIPS: Compile post DMA flush only when needed
 
-If no post-DMA flush is required, and the platform does not provide
-plat_unmap_dma_mem(), there is no need to include unmap or sync_for_cpu
-ops.
+dma_sync_phys() is only called for some CPUs when a mapping is removed.
+Add ARCH_HAS_SYNC_DMA_FOR_CPU only for the CPUs listed in
+cpu_needs_post_dma_flush() which need this extra call and do not compile
+this code in for other CPUs. We need this for R10000, R12000, BMIPS5000
+CPUs and CPUs supporting MAAR which was introduced in MIPS32r5.
 
-With this patch they are compiled out to improve icache footprint
-on devices that handle lots of DMA traffic (especially network routers).
+This will hopefully improve the performance of the not affected devices.
 
-Signed-off-by: Felix Fietkau <nbd@nbd.name>
+Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
 ---
+ arch/mips/Kconfig              | 6 +++++-
+ arch/mips/mm/dma-noncoherent.c | 2 ++
+ 2 files changed, 7 insertions(+), 1 deletion(-)
 
 --- a/arch/mips/Kconfig
 +++ b/arch/mips/Kconfig
-@@ -221,6 +221,7 @@ config BMIPS_GENERIC
- 	select BRCMSTB_L2_IRQ
- 	select IRQ_MIPS_CPU
- 	select DMA_NONCOHERENT
-+	select DMA_UNMAP_POST_FLUSH
- 	select SYS_SUPPORTS_32BIT_KERNEL
- 	select SYS_SUPPORTS_LITTLE_ENDIAN
- 	select SYS_SUPPORTS_BIG_ENDIAN
-@@ -346,6 +347,7 @@ config MACH_JAZZ
- 	select CSRC_R4K
- 	select DEFAULT_SGI_PARTITION if CPU_BIG_ENDIAN
- 	select GENERIC_ISA_DMA
-+	select DMA_UNMAP_POST_FLUSH
- 	select HAVE_PCSPKR_PLATFORM
- 	select IRQ_MIPS_CPU
- 	select I8253
-@@ -1128,6 +1130,9 @@ config DMA_NONCOHERENT
+@@ -1113,7 +1113,6 @@ config DMA_PERDEV_COHERENT
+ config DMA_NONCOHERENT
  	bool
+ 	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
+-	select ARCH_HAS_SYNC_DMA_FOR_CPU
  	select NEED_DMA_MAP_STATE
- 
-+config DMA_UNMAP_POST_FLUSH
-+	bool
-+
- config NEED_DMA_MAP_STATE
- 	bool
- 
-@@ -1652,6 +1657,7 @@ config CPU_R10000
- 	select CPU_SUPPORTS_64BIT_KERNEL
- 	select CPU_SUPPORTS_HIGHMEM
- 	select CPU_SUPPORTS_HUGEPAGES
-+	select DMA_UNMAP_POST_FLUSH
- 	help
- 	  MIPS Technologies R10000-series processors.
- 
-@@ -1900,9 +1906,11 @@ config SYS_HAS_CPU_MIPS32_R3_5
- 	bool
+ 	select DMA_NONCOHERENT_MMAP
+ 	select DMA_NONCOHERENT_CACHE_SYNC
+@@ -1894,9 +1893,11 @@ config SYS_HAS_CPU_MIPS32_R3_5
  
  config SYS_HAS_CPU_MIPS32_R5
-+	select DMA_UNMAP_POST_FLUSH
  	bool
++	select ARCH_HAS_SYNC_DMA_FOR_CPU
  
  config SYS_HAS_CPU_MIPS32_R6
-+	select DMA_UNMAP_POST_FLUSH
  	bool
++	select ARCH_HAS_SYNC_DMA_FOR_CPU
  
  config SYS_HAS_CPU_MIPS64_R1
-@@ -1912,6 +1920,7 @@ config SYS_HAS_CPU_MIPS64_R2
  	bool
+@@ -1906,6 +1907,7 @@ config SYS_HAS_CPU_MIPS64_R2
  
  config SYS_HAS_CPU_MIPS64_R6
-+	select DMA_UNMAP_POST_FLUSH
  	bool
++	select ARCH_HAS_SYNC_DMA_FOR_CPU
  
  config SYS_HAS_CPU_R3000
---- a/arch/mips/mm/dma-default.c
-+++ b/arch/mips/mm/dma-default.c
-@@ -267,8 +267,9 @@ static inline void __dma_sync(struct pag
- 	} while (left);
- }
+ 	bool
+@@ -1942,6 +1944,7 @@ config SYS_HAS_CPU_R8000
  
--static void mips_dma_unmap_page(struct device *dev, dma_addr_t dma_addr,
--	size_t size, enum dma_data_direction direction, unsigned long attrs)
-+static void __maybe_unused
-+mips_dma_unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
-+		    enum dma_data_direction direction, unsigned long attrs)
- {
- 	if (cpu_needs_post_dma_flush(dev) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC))
- 		__dma_sync(dma_addr_to_page(dev, dma_addr),
-@@ -308,9 +309,10 @@ static dma_addr_t mips_dma_map_page(stru
- 	return plat_map_dma_mem_page(dev, page) + offset;
- }
+ config SYS_HAS_CPU_R10000
+ 	bool
++	select ARCH_HAS_SYNC_DMA_FOR_CPU
  
--static void mips_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
--	int nhwentries, enum dma_data_direction direction,
--	unsigned long attrs)
-+static void __maybe_unused
-+mips_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
-+		  int nhwentries, enum dma_data_direction direction,
-+		  unsigned long attrs)
- {
- 	int i;
- 	struct scatterlist *sg;
-@@ -325,8 +327,9 @@ static void mips_dma_unmap_sg(struct dev
- 	}
+ config SYS_HAS_CPU_RM7000
+ 	bool
+@@ -1970,6 +1973,7 @@ config SYS_HAS_CPU_BMIPS4380
+ config SYS_HAS_CPU_BMIPS5000
+ 	bool
+ 	select SYS_HAS_CPU_BMIPS
++	select ARCH_HAS_SYNC_DMA_FOR_CPU
+ 
+ config SYS_HAS_CPU_XLR
+ 	bool
+--- a/arch/mips/mm/dma-noncoherent.c
++++ b/arch/mips/mm/dma-noncoherent.c
+@@ -191,12 +191,14 @@ void arch_sync_dma_for_device(struct dev
+ 		dma_sync_phys(paddr, size, dir);
  }
  
--static void mips_dma_sync_single_for_cpu(struct device *dev,
--	dma_addr_t dma_handle, size_t size, enum dma_data_direction direction)
-+static void __maybe_unused
-+mips_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
-+			     size_t size, enum dma_data_direction direction)
++#ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU
+ void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
+ 		size_t size, enum dma_data_direction dir)
  {
  	if (cpu_needs_post_dma_flush(dev))
- 		__dma_sync(dma_addr_to_page(dev, dma_handle),
-@@ -342,9 +345,9 @@ static void mips_dma_sync_single_for_dev
- 			   dma_handle & ~PAGE_MASK, size, direction);
+ 		dma_sync_phys(paddr, size, dir);
  }
- 
--static void mips_dma_sync_sg_for_cpu(struct device *dev,
--	struct scatterlist *sglist, int nelems,
--	enum dma_data_direction direction)
-+static void __maybe_unused
-+mips_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sglist,
-+			 int nelems, enum dma_data_direction direction)
- {
- 	int i;
- 	struct scatterlist *sg;
-@@ -394,12 +397,14 @@ static const struct dma_map_ops mips_def
- 	.free = mips_dma_free_coherent,
- 	.mmap = mips_dma_mmap,
- 	.map_page = mips_dma_map_page,
--	.unmap_page = mips_dma_unmap_page,
- 	.map_sg = mips_dma_map_sg,
-+#ifdef CONFIG_DMA_UNMAP_POST_FLUSH
-+	.unmap_page = mips_dma_unmap_page,
- 	.unmap_sg = mips_dma_unmap_sg,
- 	.sync_single_for_cpu = mips_dma_sync_single_for_cpu,
--	.sync_single_for_device = mips_dma_sync_single_for_device,
- 	.sync_sg_for_cpu = mips_dma_sync_sg_for_cpu,
 +#endif
-+	.sync_single_for_device = mips_dma_sync_single_for_device,
- 	.sync_sg_for_device = mips_dma_sync_sg_for_device,
- 	.dma_supported = mips_dma_supported
- };
+ 
+ void arch_dma_cache_sync(struct device *dev, void *vaddr, size_t size,
+ 		enum dma_data_direction direction)