diff options
| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2012-01-16 10:34:31 +0100 |
|---|---|---|
| committer | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2013-01-31 21:44:45 +0100 |
| commit | b849a60e0903b1c5430c3859864554662e127a8d (patch) | |
| tree | fe441d30362531fa204b52661a3d20a7f836fb19 /arch/arm/include/asm/cp15.h | |
| parent | 949db153b6466c6f7cad5a427ecea94985927311 (diff) | |
ARM: make cr_alignment read-only #ifndef CONFIG_CPU_CP15
This makes cr_alignment a constant 0 to break code that tries to modify
the value as it's likely that it's built on wrong assumption when
CONFIG_CPU_CP15 isn't defined. For code that is only reading the value 0
is more or less a fine value to report.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Message-Id: 1358413196-5609-2-git-send-email-u.kleine-koenig@pengutronix.de (v8)
Diffstat (limited to 'arch/arm/include/asm/cp15.h')
| -rw-r--r-- | arch/arm/include/asm/cp15.h | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/arch/arm/include/asm/cp15.h b/arch/arm/include/asm/cp15.h index 5ef4d8015a6..1f3262e99d8 100644 --- a/arch/arm/include/asm/cp15.h +++ b/arch/arm/include/asm/cp15.h @@ -42,6 +42,8 @@ #define vectors_high() (0) #endif +#ifdef CONFIG_CPU_CP15 + extern unsigned long cr_no_alignment; /* defined in entry-armv.S */ extern unsigned long cr_alignment; /* defined in entry-armv.S */ @@ -82,6 +84,18 @@ static inline void set_copro_access(unsigned int val) isb(); } -#endif +#else /* ifdef CONFIG_CPU_CP15 */ + +/* + * cr_alignment and cr_no_alignment are tightly coupled to cp15 (at least in the + * minds of the developers). Yielding 0 for machines without a cp15 (and making + * it read-only) is fine for most cases and saves quite some #ifdeffery. + */ +#define cr_no_alignment UL(0) +#define cr_alignment UL(0) + +#endif /* ifdef CONFIG_CPU_CP15 / else */ + +#endif /* ifndef __ASSEMBLY__ */ #endif |