diff options
Diffstat (limited to 'arch/arm64/include/asm/cacheflush.h')
| -rw-r--r-- | arch/arm64/include/asm/cacheflush.h | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/cacheflush.h b/arch/arm64/include/asm/cacheflush.h index d264a7274811..19844211a4e6 100644 --- a/arch/arm64/include/asm/cacheflush.h +++ b/arch/arm64/include/asm/cacheflush.h @@ -19,6 +19,7 @@ #ifndef __ASM_CACHEFLUSH_H #define __ASM_CACHEFLUSH_H +#include <linux/kgdb.h> #include <linux/mm.h> /* @@ -71,7 +72,7 @@ * - kaddr - page address * - size - region size */ -extern void flush_icache_range(unsigned long start, unsigned long end); +extern void __flush_icache_range(unsigned long start, unsigned long end); extern int invalidate_icache_range(unsigned long start, unsigned long end); extern void __flush_dcache_area(void *addr, size_t len); extern void __inval_dcache_area(void *addr, size_t len); @@ -81,6 +82,30 @@ extern void __clean_dcache_area_pou(void *addr, size_t len); extern long __flush_cache_user_range(unsigned long start, unsigned long end); extern void sync_icache_aliases(void *kaddr, unsigned long len); +static inline void flush_icache_range(unsigned long start, unsigned long end) +{ + __flush_icache_range(start, end); + + /* + * IPI all online CPUs so that they undergo a context synchronization + * event and are forced to refetch the new instructions. + */ +#ifdef CONFIG_KGDB + /* + * KGDB performs cache maintenance with interrupts disabled, so we + * will deadlock trying to IPI the secondary CPUs. In theory, we can + * set CACHE_FLUSH_IS_SAFE to 0 to avoid this known issue, but that + * just means that KGDB will elide the maintenance altogether! As it + * turns out, KGDB uses IPIs to round-up the secondary CPUs during + * the patching operation, so we don't need extra IPIs here anyway. + * In which case, add a KGDB-specific bodge and return early. + */ + if (kgdb_connected && irqs_disabled()) + return; +#endif + kick_all_cpus_sync(); +} + static inline void flush_cache_mm(struct mm_struct *mm) { } |