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authorHelge Deller <deller@gmx.de>2022-03-18 22:59:59 +0100
committerHelge Deller <deller@gmx.de>2022-03-18 22:59:59 +0100
commit411fadd62cecf74935693b7690b416af9bd4a332 (patch)
tree3c48888ca3b95781ff67f932f7069a05271899be /arch/parisc
parent9b046d0245cec982c72a65d3ea1b834959a9708b (diff)
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 <deller@gmx.de>
Diffstat (limited to 'arch/parisc')
-rw-r--r--arch/parisc/kernel/cache.c4
1 files changed, 4 insertions, 0 deletions
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)