diff options
| author | Tony Lindgren <tony@atomide.com> | 2010-07-05 14:53:10 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-07-09 14:41:35 +0100 |
| commit | f159f4ed55bb0fa5470800641e03a13a7e0eae6e (patch) | |
| tree | c2ed54b103c2a1c58fa4b50740fec462ccfeec74 /arch/arm/mm | |
| parent | c1b2d9704c77ddaec46d5d681e1360ac40268743 (diff) | |
ARM: 6207/1: Replace CONFIG_HAS_TLS_REG with HWCAP_TLS and check for it on V6
The TLS register is only available on ARM1136 r1p0 and later.
Set HWCAP_TLS flags if hardware TLS is available and test for
it if CONFIG_CPU_32v6K is not set for V6.
Note that we set the TLS instruction in __kuser_get_tls
dynamically as suggested by Jamie Lokier <jamie@shareable.org>.
Also the __switch_to code is optimized out in most cases as
suggested by Nicolas Pitre <nico@fluxnic.net>.
Reviewed-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm')
| -rw-r--r-- | arch/arm/mm/Kconfig | 11 | ||||
| -rw-r--r-- | arch/arm/mm/proc-v6.S | 5 | ||||
| -rw-r--r-- | arch/arm/mm/proc-v7.S | 2 |
3 files changed, 4 insertions, 14 deletions
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig index 346ae14824a..71d5d5efcee 100644 --- a/arch/arm/mm/Kconfig +++ b/arch/arm/mm/Kconfig @@ -717,17 +717,6 @@ config TLS_REG_EMUL a few prototypes like that in existence) and therefore access to that required register must be emulated. -config HAS_TLS_REG - bool - 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 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. - config NEEDS_SYSCALL_FOR_CMPXCHG bool help diff --git a/arch/arm/mm/proc-v6.S b/arch/arm/mm/proc-v6.S index 7a5337ed7d6..2f5a3c23a0f 100644 --- a/arch/arm/mm/proc-v6.S +++ b/arch/arm/mm/proc-v6.S @@ -239,7 +239,8 @@ __v6_proc_info: b __v6_setup .long cpu_arch_name .long cpu_elf_name - .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_JAVA + /* See also feat_v6_fixup() for HWCAP_TLS */ + .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_JAVA|HWCAP_TLS .long cpu_v6_name .long v6_processor_functions .long v6wbi_tlb_fns @@ -262,7 +263,7 @@ __pj4_v6_proc_info: b __v6_setup .long cpu_arch_name .long cpu_elf_name - .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP + .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_TLS .long cpu_pj4_name .long v6_processor_functions .long v6wbi_tlb_fns diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S index 7aaf88a3b7a..8071bcd4c99 100644 --- a/arch/arm/mm/proc-v7.S +++ b/arch/arm/mm/proc-v7.S @@ -344,7 +344,7 @@ __v7_proc_info: b __v7_setup .long cpu_arch_name .long cpu_elf_name - .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP + .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_TLS .long cpu_v7_name .long v7_processor_functions .long v7wbi_tlb_fns |