diff options
| author | Hyungwoo Yang <hyungwooy@nvidia.com> | 2012-04-20 10:10:57 -0700 |
|---|---|---|
| committer | Rohan Somvanshi <rsomvanshi@nvidia.com> | 2012-04-25 08:51:35 -0700 |
| commit | 68667feb8eae225f1293a7044c989ab0bba8dbd1 (patch) | |
| tree | 7e52509f3c206838db3bed79256c57c521f5d9f0 /arch/arm/vfp | |
| parent | 077c1bf346608626a5573313a041b0e86f58f0b6 (diff) | |
ARM: vfp: Prevent process migration
System crashes if there is process migration during vfp_init() call.
During vfp_init(), if a process which called vfp_enable() is migrated just
after the call, then the process executing the rest of code will access
a VFP unit which is not ENABLED and also smp_call_function() will not work
as it is expected.
This patch prevents process migration during vfp_init().
Bug 968524
Bug 961609
Bug 957974
Bug 958581
Bug 959838
Bug 946739
Change-Id: I18c0ff3af490578afd5add7a1d64cab8c8ebf487
Signed-off-by: Hyungwoo Yang <hyungwooy@nvidia.com>
Reviewed-on: http://git-master/r/98029
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Karan Jhavar <kjhavar@nvidia.com>
Reviewed-by: Thomas Cherry <tcherry@nvidia.com>
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
Diffstat (limited to 'arch/arm/vfp')
| -rw-r--r-- | arch/arm/vfp/vfpmodule.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c index e381dc68505d..6a46b56f7538 100644 --- a/arch/arm/vfp/vfpmodule.c +++ b/arch/arm/vfp/vfpmodule.c @@ -574,6 +574,9 @@ static int __init vfp_init(void) unsigned int vfpsid; unsigned int cpu_arch = cpu_architecture(); +#ifdef CONFIG_SMP + preempt_disable(); +#endif if (cpu_arch >= CPU_ARCH_ARMv6) vfp_enable(NULL); @@ -644,6 +647,9 @@ static int __init vfp_init(void) elf_hwcap |= HWCAP_VFPv4; } } +#ifdef CONFIG_SMP + preempt_enable(); +#endif return 0; } |