From: Shinya Kuribayashi Date: Sun, 22 Feb 2009 05:24:11 +0000 (+0900) Subject: MIPS: Fix GCC-4.2 'discards qualifiers from pointer target type' warnings X-Git-Tag: v2009.03-rc1~4 X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=14209ac13ff631e36c9a9dd426c59c2e2f5dab00;p=oweals%2Fu-boot.git MIPS: Fix GCC-4.2 'discards qualifiers from pointer target type' warnings Compiling dbau1x00 and gth2 boards with GCC-4.2, you would see new warnings like this: skuribay@ubuntu:u-boot.git$ ./MAKEALL dbau1000 Configuring for dbau1x00 board... au1x00_eth.c: In function 'au1x00_send': au1x00_eth.c:158: warning: passing argument 1 of 'virt_to_phys' discards qualifiers from pointer target type au1x00_eth.c: In function 'au1x00_recv': au1x00_eth.c:211: warning: passing argument 1 of 'virt_to_phys' discards qualifiers from pointer target type au1x00_eth.c: In function 'au1x00_init': au1x00_eth.c:252: warning: passing argument 1 of 'virt_to_phys' discards qualifiers from pointer target type au1x00_eth.c: In function 'au1x00_recv': au1x00_eth.c:211: warning: passing argument 1 of 'virt_to_phys' discards qualifiers from pointer target type au1x00_eth.c: In function 'au1x00_init': au1x00_eth.c:252: warning: passing argument 1 of 'virt_to_phys' discards qualifiers from pointer target type au1x00_eth.c: In function 'au1x00_send': au1x00_eth.c:158: warning: passing argument 1 of 'virt_to_phys' discards qualifiers from pointer target type We're passing a volatile pointer to a function which is expecting a non- volatile pointer. That's potentially dangerous, so gcc warns about it. Confirmed with ELDK 4.2 (GCC 4.2.2) and Sourcey G++ 4.2 (GCC 4.2.3). To fix this, we add a volatile attribute to the argument in question. The virt_to_phys function in Linux kernel also does the same thing. Signed-off-by: Stefan Roese Signed-off-by: Shinya Kuribayashi --- diff --git a/include/asm-mips/io.h b/include/asm-mips/io.h index 031186d037..025012ae60 100644 --- a/include/asm-mips/io.h +++ b/include/asm-mips/io.h @@ -118,7 +118,7 @@ static inline void set_io_port_base(unsigned long base) * Change virtual addresses to physical addresses and vv. * These are trivial on the 1:1 Linux/MIPS mapping */ -extern inline phys_addr_t virt_to_phys(void * address) +extern inline phys_addr_t virt_to_phys(volatile void * address) { return CPHYSADDR(address); }