7c03156f34
This patch add the VDSO time support for the IA32 Emulation Layer. Due the nature of the kernel headers and the LP64 compiler where the size of a long and a pointer differs against a 32 bit compiler, there is some type hacking necessary for optimal performance. The vsyscall_gtod_data struture must be a rearranged to serve 32- and 64-bit code access at the same time: - The seqcount_t was replaced by an unsigned, this makes the vsyscall_gtod_data intedepend of kernel configuration and internal functions. - All kernel internal structures are replaced by fix size elements which works for 32- and 64-bit access - The inner struct clock was removed to pack the whole struct. The "unsigned seq" would be handled by functions derivated from seqcount_t. Signed-off-by: Stefani Seibold <stefani@seibold.net> Link: http://lkml.kernel.org/r/1395094933-14252-11-git-send-email-stefani@seibold.net Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
31 lines
557 B
C
31 lines
557 B
C
#define BUILD_VDSO32
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#ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE
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#undef CONFIG_OPTIMIZE_INLINING
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#endif
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#undef CONFIG_X86_PPRO_FENCE
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#ifdef CONFIG_X86_64
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/*
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* in case of a 32 bit VDSO for a 64 bit kernel fake a 32 bit kernel
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* configuration
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*/
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#undef CONFIG_64BIT
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#undef CONFIG_X86_64
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#undef CONFIG_ILLEGAL_POINTER_VALUE
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#undef CONFIG_SPARSEMEM_VMEMMAP
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#undef CONFIG_NR_CPUS
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#define CONFIG_X86_32 1
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#define CONFIG_PAGE_OFFSET 0
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#define CONFIG_ILLEGAL_POINTER_VALUE 0
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#define CONFIG_NR_CPUS 1
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#define BUILD_VDSO32_64
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#endif
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#include "../vclock_gettime.c"
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