On Fri, Jun 13, 2014 at 04:03:32PM +0100, Pawel Moll wrote: > When running a 32-bit userspace on a 64-bit kernel (eg. i386 > application on x86_64 kernel or 32-bit arm userspace on arm64 > kernel) some of the perf ioctls must be treated with special > care, as they have a pointer size encoded in the command. > > For example, PERF_EVENT_IOC_ID in 32-bit world will be encoded > as 0x80042407, but 64-bit kernel will expect 0x80082407. In > result the ioctl will fail returning -ENOTTY. > > This patch solves the problem by adding code fixing up the > size as compat_ioctl file operation. > > Reported-by: Drew Richardson <drew.richard...@arm.com> > Signed-off-by: Pawel Moll <pawel.m...@arm.com> > ---
This gets me (on my favourite x86_64 .config): kernel/events/core.c: In function ‘perf_compat_ioctl’: kernel/events/core.c:3726:32: error: ‘compat_uptr_t’ undeclared (first use in this function) kernel/events/core.c:3726:32: note: each undeclared identifier is reported only once for each function it appears in
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