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ARM: VDSO

Jan Glauber linux-arm-kernel 1 version New

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  1. v7 Latest0 of 9 patches 0 repliesNew

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Cover letter [PATCH v7 0/9] ARM: VDSO
Quoted 5 lines · Nathan Lynch

Provide fast userspace implementations of gettimeofday and clock_gettime on systems that implement the generic timers extension defined in ARMv7. This follows the example of arm64 in conception but significantly differs in some aspects of the implementation (C vs assembly, mainly).

Hi Nathan,

applying your patches I get the following compile error under Ubuntu 12.04:

  CC      arch/arm/kernel/vdso.o
  LDS     arch/arm/kernel/vdso/vdso.lds
  CC      arch/arm/kernel/vdso/vgettimeofday.o
  AS      arch/arm/kernel/vdso/datapage.o
  VDSOL   arch/arm/kernel/vdso/vdso.so.raw
  HOSTCC  arch/arm/kernel/vdso/vdsomunge

arch/arm/kernel/vdso/vdsomunge.c: In function ?main?:
arch/arm/kernel/vdso/vdsomunge.c:152:16: error: ?EF_ARM_ABI_FLOAT_HARD? undeclared (first use in this function) arch/arm/kernel/vdso/vdsomunge.c:152:16: note: each undeclared identifier is reported only once for each function it appears in arch/arm/kernel/vdso/vdsomunge.c:156:34: error: ?EF_ARM_ABI_FLOAT_SOFT? undeclared (first use in this function) make[2]: *** [arch/arm/kernel/vdso/vdsomunge] Error 1
make[1]: *** [arch/arm/kernel/vdso] Error 2
make: *** [arch/arm/kernel] Error 2

Looks like the libc dev is too old (EF_ARM_ABI_FLOAT_* not in /usr/include/elf.h). On a more recent Ubuntu it compiles fine. Not sure how to solve this, maybe disable vdso if the libc is too old?

Regards, Jan

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