| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame] | 1 | From: Wolfram Joost <dbox2@frokaschwei.de> |
| 2 | Subject: [PATCH] fork_cacheflush |
| 3 | |
| 4 | On ASUS WL-500gP there are many unexpected "Segmentation fault"s that |
| 5 | seem to be caused by a kernel. They can be avoided by: |
| 6 | 1) Disabling highpage |
| 7 | 2) Using flush_cache_mm in flush_cache_dup_mm |
| 8 | |
| 9 | For details see OpenWrt ticket #2035 https://dev.openwrt.org/ticket/2035 |
| 10 | --- |
| 11 | --- a/arch/mips/include/asm/cacheflush.h |
| 12 | +++ b/arch/mips/include/asm/cacheflush.h |
| 13 | @@ -46,7 +46,7 @@ |
| 14 | extern void (*flush_cache_all)(void); |
| 15 | extern void (*__flush_cache_all)(void); |
| 16 | extern void (*flush_cache_mm)(struct mm_struct *mm); |
| 17 | -#define flush_cache_dup_mm(mm) do { (void) (mm); } while (0) |
| 18 | +#define flush_cache_dup_mm(mm) flush_cache_mm(mm) |
| 19 | extern void (*flush_cache_range)(struct vm_area_struct *vma, |
| 20 | unsigned long start, unsigned long end); |
| 21 | extern void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page, unsigned long pfn); |