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| author | Alison Wang <b18965@freescale.com> | 2015-09-09 10:22:02 +0800 |
|---|---|---|
| committer | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2015-10-16 07:55:51 +0200 |
| commit | 53fd4b8c22bbdf4598f87e701e9a6c6ee50172ff (patch) | |
| tree | 24d8f51da79a8a92ad533fb87122756ba78d4d3b /arch/arm/include/asm/system.h | |
| parent | 1275456d31cc130738775dca19b0a2ab1374cfbd (diff) | |
| download | talos-obmc-uboot-53fd4b8c22bbdf4598f87e701e9a6c6ee50172ff.tar.gz talos-obmc-uboot-53fd4b8c22bbdf4598f87e701e9a6c6ee50172ff.zip | |
arm: mmu: Add missing volatile for reading SCTLR register
Add 'volatile' qualifier to the asm statement in get_cr()
so that the statement is not optimized out by the compiler.
(http://comments.gmane.org/gmane.linux.linaro.toolchain/5163)
Without the 'volatile', get_cr() returns a wrong value which
prevents enabling the MMU and later causes a PCIE VA access
failure.
Signed-off-by: Alison Wang <alison.wang@freescale.com>
Diffstat (limited to 'arch/arm/include/asm/system.h')
| -rw-r--r-- | arch/arm/include/asm/system.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h index 868ea54b4f..cfc7834ed9 100644 --- a/arch/arm/include/asm/system.h +++ b/arch/arm/include/asm/system.h @@ -194,7 +194,7 @@ void save_boot_params_ret(void); static inline unsigned int get_cr(void) { unsigned int val; - asm("mrc p15, 0, %0, c1, c0, 0 @ get CR" : "=r" (val) : : "cc"); + asm volatile("mrc p15, 0, %0, c1, c0, 0 @ get CR" : "=r" (val) : : "cc"); return val; } |
