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arm64/mm: Restructure arch_validate_flags() for extensibility

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Currently arch_validate_flags() is written in a very non-extensible
fashion, returning immediately if MTE is not supported and writing the MTE
check as a direct return. Since we will want to add more checks for GCS
refactor the existing code to be more extensible, no functional change
intended.

Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20241001-arm64-gcs-v13-3-222b78d87eee@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Mark Brown
2024-10-01 23:58:42 +01:00
committed by Catalin Marinas
parent 9ab515b18f
commit f645e888b1
1 changed files with 10 additions and 4 deletions
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14
arch/arm64/include/asm/mman.h
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@@ -62,11 +62,17 @@ static inline bool arch_validate_prot(unsigned long prot,
static inline bool arch_validate_flags(unsigned long vm_flags)
{
if (!system_supports_mte())
return true;
if (system_supports_mte()) {
/*
* only allow VM_MTE if VM_MTE_ALLOWED has been set
* previously
*/
if ((vm_flags & VM_MTE) && !(vm_flags & VM_MTE_ALLOWED))
return false;
}
return true;
/* only allow VM_MTE if VM_MTE_ALLOWED has been set previously */
return !(vm_flags & VM_MTE) || (vm_flags & VM_MTE_ALLOWED);
}
#define arch_validate_flags(vm_flags) arch_validate_flags(vm_flags)