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Kirill Korotaev wrote:
>>> +#if defined(CONFIG_DEFAULT_3G)
>>> +#define __PAGE_OFFSET_RAW (0xC0000000)
>>> +#elif defined(CONFIG_DEFAULT_3G_OPT)
>>> +#define __PAGE_OFFSET_RAW (0xB0000000)
>>> +#elif defined(CONFIG_DEFAULT_2G)
>>> +#define __PAGE_OFFSET_RAW (0x78000000)
>>> +#elif defined(CONFIG_DEFAULT_1G)
>>> +#define __PAGE_OFFSET_RAW (0x40000000)
>>> +#else
>>> +#error "Bad user/kernel offset"
>>> +#endif
>>> +
>>> #ifdef __ASSEMBLY__
>>> -#define __PAGE_OFFSET (0xC0000000)
>>> +#define __PAGE_OFFSET __PAGE_OFFSET_RAW
>>> #define __PHYSICAL_START CONFIG_PHYSICAL_START
>>> #else
>>> -#define __PAGE_OFFSET (0xC0000000UL)
>>> +#define __PAGE_OFFSET ((unsigned long)__PAGE_OFFSET_RAW)
>>> #define __PHYSICAL_START ((unsigned long)CONFIG_PHYSICAL_START)
>>> #endif
>>> #define __KERNEL_START (__PAGE_OFFSET + __PHYSICAL_START)
>>
>> Changing PAGE_OFFSET this way would break at least Valgrind (the latest
>> release 3.1.0 by default is statically linked at address 0xb0000000, and
>> PIE support does not seem to be present in that release). I remember
>> that similar changes were also breaking Lisp implementations (cmucl,
>> sbcl), however, I am not really sure about this.
> it also breaks some java versions, so we use 3:4 Gb split in OpenVZ, but
> redhat still uses 4:4 in enterprise version, so number of such
> applications should decrease :)

Mmm.. that's an old thread. The reply above was to
a posting from Sergey Vlasov (the same) on Tue Jan 10 2006,
12:06:50 EST.
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