egl: Fix _eglPointerIsDereferencable() to ignore page residency
mincore() returns 0 on success, and -1 on failure. The last parameter is a vector of bytes with one entry for each page queried. mincore returns page residency information in the first bit of each byte in the vector. Residency doesn't actually matter when determining whether a pointer is dereferenceable, so the output vector can be ignored. What matters is whether mincore succeeds. See: http://man7.org/linux/man-pages/man2/mincore.2.html Signed-off-by: Miguel A. Vico <mvicomoya@nvidia.com> Acked-by: Daniel Stone <daniels@collabora.com> Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
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@ -168,7 +168,18 @@ _eglPointerIsDereferencable(void *p)
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return EGL_FALSE;
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}
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return (valid & 0x01) == 0x01;
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/* mincore() returns 0 on success, and -1 on failure. The last parameter
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* is a vector of bytes with one entry for each page queried. mincore
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* returns page residency information in the first bit of each byte in the
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* vector.
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*
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* Residency doesn't actually matter when determining whether a pointer is
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* dereferenceable, so the output vector can be ignored. What matters is
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* whether mincore succeeds. See:
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*
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* http://man7.org/linux/man-pages/man2/mincore.2.html
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*/
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return EGL_TRUE;
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#else
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return p != NULL;
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#endif
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