Re: calling getcpu with misaligned address causes kernel panic

[Helge Deller via Bugspray Bot <bugbot@kernel.org>]

Helge Deller writes via Kernel.org Bugzilla:

I'd assume the segfault on x86 is because of the vDSO implementation
of getcpu() on x86, which executes vdso_read_cpunode() from
arch/x86/include/asm/segment.h:

static inline void vdso_read_cpunode(unsigned *cpu, unsigned *node)
{
...
        if (cpu)
                *cpu = (p & VDSO_CPUNODE_MASK);
        if (node)
                *node = (p >> VDSO_CPUNODE_BITS);

View: https://bugzilla.kernel.org/show_bug.cgi?id=219339#c4
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