From: Jeff Hansen Subject: [PATCH] no highpage On ASUS WL-500gP there are many unexpected "Segmentation fault"s that seem to be caused by a kernel. They can be avoided by: 1) Disabling highpage 2) Using flush_cache_mm in flush_cache_dup_mm For details see OpenWrt ticket #2035 https://dev.openwrt.org/ticket/2035 --- --- a/arch/mips/include/asm/page.h +++ b/arch/mips/include/asm/page.h @@ -71,6 +71,7 @@ static inline unsigned int page_size_ftl #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */ #include +#include extern void build_clear_page(void); extern void build_copy_page(void); @@ -105,11 +106,16 @@ static inline void clear_user_page(void flush_data_cache_page((unsigned long)addr); } -struct vm_area_struct; -extern void copy_user_highpage(struct page *to, struct page *from, - unsigned long vaddr, struct vm_area_struct *vma); +static inline void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, + struct page *to) +{ + extern void (*flush_data_cache_page)(unsigned long addr); -#define __HAVE_ARCH_COPY_USER_HIGHPAGE + copy_page(vto, vfrom); + if (!cpu_has_ic_fills_f_dc || + pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK)) + flush_data_cache_page((unsigned long)vto); +} /* * These are used to make use of C type-checking.. --- a/arch/mips/mm/init.c +++ b/arch/mips/mm/init.c @@ -158,30 +158,6 @@ void kunmap_coherent(void) preempt_enable(); } -void copy_user_highpage(struct page *to, struct page *from, - unsigned long vaddr, struct vm_area_struct *vma) -{ - void *vfrom, *vto; - - vto = kmap_atomic(to); - if (cpu_has_dc_aliases && cpu_use_kmap_coherent && - page_mapped(from) && !Page_dcache_dirty(from)) { - vfrom = kmap_coherent(from, vaddr); - copy_page(vto, vfrom); - kunmap_coherent(); - } else { - vfrom = kmap_atomic(from); - copy_page(vto, vfrom); - kunmap_atomic(vfrom); - } - if ((!cpu_has_ic_fills_f_dc) || - pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK)) - flush_data_cache_page((unsigned long)vto); - kunmap_atomic(vto); - /* Make sure this page is cleared on other CPU's too before using it */ - smp_wmb(); -} - void copy_to_user_page(struct vm_area_struct *vma, struct page *page, unsigned long vaddr, void *dst, const void *src, unsigned long len) t-T_Meter-partition.patch?h=openwrt-18.06&id=2c8cb0c572956a59d6495e4d2e0463bc14bf8d0e'>treecommitdiffstats
path: root/target/linux/generic/patches-4.4/432-mtd-bcm47xxpart-detect-T_Meter-partition.patch
blob: a19e943efecd59857d961b7375632afb4ae3231d (plain) 
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From fd54aa583296f9adfb1f519affbc10ba521eb809 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
Date: Wed, 28 Jan 2015 22:14:41 +0100
Subject: [PATCH] mtd: bcm47xxpart: detect T_Meter partition
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

It can be found on many Netgear devices. It consists of many 0x30 blocks
starting with 4D 54.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
---
 drivers/mtd/bcm47xxpart.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

--- a/drivers/mtd/bcm47xxpart.c
+++ b/drivers/mtd/bcm47xxpart.c
@@ -39,6 +39,7 @@
 #define NVRAM_HEADER			0x48534C46	/* FLSH */
 #define POT_MAGIC1			0x54544f50	/* POTT */
 #define POT_MAGIC2			0x504f		/* OP */
+#define T_METER_MAGIC			0x4D540000	/* MT */
 #define ML_MAGIC1			0x39685a42
 #define ML_MAGIC2			0x26594131
 #define TRX_MAGIC			0x30524448
@@ -297,6 +298,15 @@ static int bcm47xxpart_parse(struct mtd_
 					     MTD_WRITEABLE);
 			continue;
 		}
+
+		/* T_Meter */
+		if ((le32_to_cpu(buf[0x000 / 4]) & 0xFFFF0000) == T_METER_MAGIC &&
+		    (le32_to_cpu(buf[0x030 / 4]) & 0xFFFF0000) == T_METER_MAGIC &&
+		    (le32_to_cpu(buf[0x060 / 4]) & 0xFFFF0000) == T_METER_MAGIC) {
+			bcm47xxpart_add_part(&parts[curr_part++], "T_Meter", offset,
+					     MTD_WRITEABLE);
+			continue;
+		}
 
 		/* TRX */
 		if (buf[0x000 / 4] == TRX_MAGIC) {