Commit 411fadd6 authored by Helge Deller's avatar Helge Deller
Browse files

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: default avatarHelge Deller <deller@gmx.de>
parent 9b046d02

arch/parisc/kernel/cache.c

+4 −0
Original line number Diff line number Diff line
@@ -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)