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    Subject2.6.21-mm1: DRM does kmalloc(0) sometimes?
    Is this a sign of bug? The box is functioning OK, despite

    WARN_ON_ONCE(size == 0);
    -------------------------------------------------------------
    CONFIG_DRM=y
    CONFIG_DRM_RADEON=y
    X.org 7.1.1 as shipped with Gentoo
    VGA compatible controller: ATI Technologies Inc RV350 AP [Radeon 9600]
    -------------------------------------------------------------
    ...
    agpgart: Found an AGP 3.0 compliant device at 0000:00:00.0.
    agpgart: Putting AGP V3 device at 0000:00:00.0 into 4x mode
    agpgart: Putting AGP V3 device at 0000:01:00.0 into 4x mode
    eth0: link up, 100Mbps, full-duplex, lpa 0x41E1
    eth1: link up, 100Mbps, full-duplex, lpa 0x45E1
    eth1: link up, 100Mbps, full-duplex, lpa 0x45E1
    [drm] Setting GART location based on new memory map
    [drm] Loading R300 Microcode
    [drm] writeback test succeeded in 1 usecs
    BUG: at include/linux/slub_def.h:88 kmalloc_index()
    [<c0147ed1>] get_slab+0x43/0x1c6
    [<c01480b3>] __kmalloc+0xc/0x2b
    [<c027c1e6>] drm_rmdraw+0x0/0x251
    [<c027c30f>] drm_rmdraw+0x129/0x251
    [<c027c1e6>] drm_rmdraw+0x0/0x251
    [<c027ce2f>] drm_ioctl+0x152/0x197
    [<c0153b0c>] do_ioctl+0x4c/0x64
    [<c0153d61>] vfs_ioctl+0x23d/0x250
    [<c01025e2>] sysenter_past_esp+0x8f/0x99
    [<c0153da7>] sys_ioctl+0x33/0x4c
    [<c01025b2>] sysenter_past_esp+0x5f/0x99
    =======================
    agpgart: Found an AGP 3.0 compliant device at 0000:00:00.0.
    agpgart: Putting AGP V3 device at 0000:00:00.0 into 4x mode
    agpgart: Putting AGP V3 device at 0000:01:00.0 into 4x mode
    [drm] Setting GART location based on new memory map
    [drm] Loading R300 Microcode
    [drm] writeback test succeeded in 1 usecs
    agpgart: Found an AGP 3.0 compliant device at 0000:00:00.0.
    agpgart: Putting AGP V3 device at 0000:00:00.0 into 4x mode
    agpgart: Putting AGP V3 device at 0000:01:00.0 into 4x mode
    [drm] Loading R300 Microcode
    agpgart: Found an AGP 3.0 compliant device at 0000:00:00.0.
    agpgart: Putting AGP V3 device at 0000:00:00.0 into 4x mode
    agpgart: Putting AGP V3 device at 0000:01:00.0 into 4x mode
    [drm] Loading R300 Microcode
    agpgart: Found an AGP 3.0 compliant device at 0000:00:00.0.
    agpgart: Putting AGP V3 device at 0000:00:00.0 into 4x mode
    agpgart: Putting AGP V3 device at 0000:01:00.0 into 4x mode
    [drm] Loading R300 Microcode
    agpgart: Found an AGP 3.0 compliant device at 0000:00:00.0.
    agpgart: Putting AGP V3 device at 0000:00:00.0 into 4x mode
    agpgart: Putting AGP V3 device at 0000:01:00.0 into 4x mode
    [drm] Loading R300 Microcode
    agpgart: Found an AGP 3.0 compliant device at 0000:00:00.0.
    agpgart: Putting AGP V3 device at 0000:00:00.0 into 4x mode
    agpgart: Putting AGP V3 device at 0000:01:00.0 into 4x mode
    [drm] Loading R300 Microcode
    Clocksource tsc unstable (delta = 104013683 ns)
    Time: pit clocksource has been installed.

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