powerpc: Avoid comparison of unsigned long >= 0 in pfn_valid()
Rewrite comparison since all values compared are of type `unsigned long`.
Instead of using unsigned properties and rewriting the original code as:
(originally suggested by Segher Boessenkool <segher@kernel.crashing.org>)
#define pfn_valid(pfn) \
(((pfn) - ARCH_PFN_OFFSET) < (max_mapnr - ARCH_PFN_OFFSET))
Prefer a static inline function to make code as readable as possible.
Fix a warning (treated as error in W=1):
arch/powerpc/include/asm/page.h:129:32: error: comparison of unsigned expression >= 0 is always true [-Werror=type-limits]
#define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr)
^
Suggested-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Mathieu Malaterre <malat@debian.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h
index d5f1c41..dec9ce5 100644
--- a/arch/powerpc/include/asm/page.h
+++ b/arch/powerpc/include/asm/page.h
@@ -126,7 +126,15 @@
#ifdef CONFIG_FLATMEM
#define ARCH_PFN_OFFSET ((unsigned long)(MEMORY_START >> PAGE_SHIFT))
-#define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr)
+#ifndef __ASSEMBLY__
+extern unsigned long max_mapnr;
+static inline bool pfn_valid(unsigned long pfn)
+{
+ unsigned long min_pfn = ARCH_PFN_OFFSET;
+
+ return pfn >= min_pfn && pfn < max_mapnr;
+}
+#endif
#endif
#define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)