From 411fadd62cecf74935693b7690b416af9bd4a332 Mon Sep 17 00:00:00 2001 From: Helge Deller Date: Fri, 18 Mar 2022 22:59:59 +0100 Subject: parisc: Avoid flushing cache on cache-less machines Avoid flushing caches in __flush_cache_page() and __purge_cache_page() if the machine hasn't data or instruction caches - as e.g. in qemu. Signed-off-by: Helge Deller --- arch/parisc/kernel/cache.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'arch/parisc/kernel/cache.c') diff --git a/arch/parisc/kernel/cache.c b/arch/parisc/kernel/cache.c index 231cebb3fc0d..d41fee3a9874 100644 --- a/arch/parisc/kernel/cache.c +++ b/arch/parisc/kernel/cache.c @@ -315,6 +315,8 @@ static inline void __flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, unsigned long physaddr) { + if (!static_branch_likely(&parisc_has_cache)) + return; preempt_disable(); flush_dcache_page_asm(physaddr, vmaddr); if (vma->vm_flags & VM_EXEC) @@ -326,6 +328,8 @@ static inline void __purge_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, unsigned long physaddr) { + if (!static_branch_likely(&parisc_has_cache)) + return; preempt_disable(); purge_dcache_page_asm(physaddr, vmaddr); if (vma->vm_flags & VM_EXEC) -- cgit v1.2.3