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authorLinus Walleij <linus.walleij@linaro.org>2022-06-02 11:18:32 +0300
committerLinus Walleij <linus.walleij@linaro.org>2023-05-29 12:27:08 +0300
commita9ff6961601d9aa0c42b6eb7d850371f31b1f5e6 (patch)
tree4f685558e06fb4667cb7634285d4d5eff4d1e7d8 /arch/arm/mach-berlin
parent2d78057f0dd41c5e24b824a3ea254a0672ec73eb (diff)
downloadlinux-a9ff6961601d9aa0c42b6eb7d850371f31b1f5e6.tar.xz
ARM: mm: Make virt_to_pfn() a static inline
Making virt_to_pfn() a static inline taking a strongly typed (const void *) makes the contract of a passing a pointer of that type to the function explicit and exposes any misuse of the macro virt_to_pfn() acting polymorphic and accepting many types such as (void *), (unitptr_t) or (unsigned long) as arguments without warnings. Doing this is a bit intrusive: virt_to_pfn() requires PHYS_PFN_OFFSET and PAGE_SHIFT to be defined, and this is defined in <asm/page.h>, so this must be included *before* <asm/memory.h>. The use of macros were obscuring the unclear inclusion order here, as the macros would eventually be resolved, but a static inline like this cannot be compiled with unresolved macros. The naive solution to include <asm/page.h> at the top of <asm/memory.h> does not work, because <asm/memory.h> sometimes includes <asm/page.h> at the end of itself, which would create a confusing inclusion loop. So instead, take the approach to always unconditionally include <asm/page.h> at the end of <asm/memory.h> arch/arm uses <asm/memory.h> explicitly in a lot of places, however it turns out that if we just unconditionally include <asm/memory.h> into <asm/page.h> and switch all inclusions of <asm/memory.h> to <asm/page.h> instead, we enforce the right order and <asm/memory.h> will always have access to the definitions. Put an inclusion guard in place making it impossible to include <asm/memory.h> explicitly. Link: https://lore.kernel.org/linux-mm/20220701160004.2ffff4e5ab59a55499f4c736@linux-foundation.org/ Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'arch/arm/mach-berlin')
-rw-r--r--arch/arm/mach-berlin/platsmp.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/mach-berlin/platsmp.c b/arch/arm/mach-berlin/platsmp.c
index 593fc4a69d84..ed94758d30ff 100644
--- a/arch/arm/mach-berlin/platsmp.c
+++ b/arch/arm/mach-berlin/platsmp.c
@@ -12,7 +12,7 @@
#include <asm/cacheflush.h>
#include <asm/cp15.h>
-#include <asm/memory.h>
+#include <asm/page.h>
#include <asm/smp_plat.h>
#include <asm/smp_scu.h>