[PATCH v4 7/8] powerpc/book3s/pmem: Add WARN_ONCE to catch the wrong usage of pmem flush functions.
We only support persistent memory on P8 and above. This is enforced by the
firmware and further checked on virtualzied platform during platform init.
Add WARN_ONCE in pmem flush routines to catch the wrong usage of these.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar(a)linux.ibm.com>
---
arch/powerpc/include/asm/cacheflush.h | 2 ++
arch/powerpc/lib/pmem.c | 2 ++
2 files changed, 4 insertions(+)
diff --git a/arch/powerpc/include/asm/cacheflush.h
b/arch/powerpc/include/asm/cacheflush.h
index bc3ea009cf14..865fae8a226e 100644
--- a/arch/powerpc/include/asm/cacheflush.h
+++ b/arch/powerpc/include/asm/cacheflush.h
@@ -125,6 +125,8 @@ static inline void arch_pmem_flush_barrier(void)
{
if (cpu_has_feature(CPU_FTR_ARCH_207S))
asm volatile(PPC_PHWSYNC ::: "memory");
+ else
+ WARN_ONCE(1, "Using pmem flush on older hardware.");
}
#endif /* __KERNEL__ */
diff --git a/arch/powerpc/lib/pmem.c b/arch/powerpc/lib/pmem.c
index 21210fa676e5..f40bd908d28d 100644
--- a/arch/powerpc/lib/pmem.c
+++ b/arch/powerpc/lib/pmem.c
@@ -37,12 +37,14 @@ static inline void clean_pmem_range(unsigned long start, unsigned long
stop)
{
if (cpu_has_feature(CPU_FTR_ARCH_207S))
return __clean_pmem_range(start, stop);
+ WARN_ONCE(1, "Using pmem flush on older hardware.");
}
static inline void flush_pmem_range(unsigned long start, unsigned long stop)
{
if (cpu_has_feature(CPU_FTR_ARCH_207S))
return __flush_pmem_range(start, stop);
+ WARN_ONCE(1, "Using pmem flush on older hardware.");
}
/*
--
2.26.2