From: Stafford Horne shorne@gmail.com
[ Upstream commit 3ae90d764093dfcd6ab8ab6875377302892c87d4 ]
I found this when compiling a kbuild random config with GCC 11. The config enables CONFIG_DEBUG_SECTION_MISMATCH, which sets CFLAGS -fno-inline-functions-called-once. This causes the call to cache_loop in cache.c to not be inlined causing the below compile error.
In file included from arch/openrisc/mm/cache.c:13: arch/openrisc/mm/cache.c: In function 'cache_loop': ./arch/openrisc/include/asm/spr.h:16:27: warning: 'asm' operand 0 probably does not match constraints 16 | #define mtspr(_spr, _val) __asm__ __volatile__ ( \ | ^~~~~~~ arch/openrisc/mm/cache.c:25:3: note: in expansion of macro 'mtspr' 25 | mtspr(reg, line); | ^~~~~ ./arch/openrisc/include/asm/spr.h:16:27: error: impossible constraint in 'asm' 16 | #define mtspr(_spr, _val) __asm__ __volatile__ ( \ | ^~~~~~~ arch/openrisc/mm/cache.c:25:3: note: in expansion of macro 'mtspr' 25 | mtspr(reg, line); | ^~~~~ make[1]: *** [scripts/Makefile.build:283: arch/openrisc/mm/cache.o] Error 1
The asm constraint "K" requires a immediate constant argument to mtspr, however because of no inlining a register argument is passed causing a failure. Fix this by using __always_inline.
Link: https://lore.kernel.org/lkml/202008200453.ohnhqkjQ%25lkp@intel.com/ Signed-off-by: Stafford Horne shorne@gmail.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/openrisc/mm/cache.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/openrisc/mm/cache.c b/arch/openrisc/mm/cache.c index b747bf1fc1b63..4272d9123f9ed 100644 --- a/arch/openrisc/mm/cache.c +++ b/arch/openrisc/mm/cache.c @@ -20,7 +20,7 @@ #include <asm/cacheflush.h> #include <asm/tlbflush.h>
-static void cache_loop(struct page *page, const unsigned int reg) +static __always_inline void cache_loop(struct page *page, const unsigned int reg) { unsigned long paddr = page_to_pfn(page) << PAGE_SHIFT; unsigned long line = paddr & ~(L1_CACHE_BYTES - 1);