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| author | Nicolas Pitre <nico@org.rmk.(none)> | 2005-05-12 22:27:12 +0400 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2005-05-12 22:27:12 +0400 |
| commit | 70489c88d0b7e5820ac37a039a910bb396e2a4e3 (patch) | |
| tree | 47f5ad9729469cad40c926af4961611208bdfdc1 | |
| parent | d7def6c22dfa9f32b3d9e5546a7a6a90c644ff5f (diff) | |
| download | linux-70489c88d0b7e5820ac37a039a910bb396e2a4e3.tar.xz | |
[PATCH] ARM: 2680/1: refine TLS reg availability some more again
Patch from Nicolas Pitre
Not all ARMv6 processors implement the TLS register.
Signed-off-by: Nicolas Pitre
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| -rw-r--r-- | arch/arm/mm/Kconfig | 21 |
1 files changed, 10 insertions, 11 deletions
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig index 07646d25e265..48bac7da8c70 100644 --- a/arch/arm/mm/Kconfig +++ b/arch/arm/mm/Kconfig @@ -412,21 +412,20 @@ config CPU_BPREDICT_DISABLE config TLS_REG_EMUL bool - default y if (SMP || CPU_32v6) && (CPU_32v5 || CPU_32v4 || CPU_32v3) + default y if SMP && (CPU_32v5 || CPU_32v4 || CPU_32v3) help - We might be running on an ARMv6+ processor which should have the TLS - register but for some reason we can't use it, or maybe an SMP system - using a pre-ARMv6 processor (there are apparently a few prototypes - like that in existence) and therefore access to that register must - be emulated. + An SMP system using a pre-ARMv6 processor (there are apparently + a few prototypes like that in existence) and therefore access to + that required register must be emulated. config HAS_TLS_REG bool - depends on CPU_32v6 - default y if !TLS_REG_EMUL + depends on !TLS_REG_EMUL + default y if SMP || CPU_32v7 help This selects support for the CP15 thread register. - It is defined to be available on ARMv6 or later. If a particular - ARMv6 or later CPU doesn't support it then it must include "select - TLS_REG_EMUL" along with its other characteristics. + It is defined to be available on some ARMv6 processors (including + all SMP capable ARMv6's) or later processors. User space may + assume directly accessing that register and always obtain the + expected value only on ARMv7 and above. |