[Bug 206762] -Wtautilogical-pointer-compare issues with drm(4) code

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206762

            Bug ID: 206762
           Summary: -Wtautilogical-pointer-compare issues with drm(4) code
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ngie at FreeBSD.org

Ran into these issues on amd64 with buildkernel:

$ svnversion
295081
$ env SRCCONF=/dev/null make tinderbox KERNCONF=LINT -j4
...
--- all_subdir_i915kms ---^M
/usr/src/svn/sys/modules/drm2/i915kms/../../../dev/drm2/i915/i915_gem.c:680:12:
warning: comparison of address of 'obj->base' equal to a null pointer is always
false [-Wtautological-pointer-compare]^M
        if (&obj->base == NULL) {^M
             ~~~~~^~~~    ~~~~^M
/usr/src/svn/sys/modules/drm2/i915kms/../../../dev/drm2/i915/i915_gem.c:1040:12:
warning: comparison of address of 'obj->base' equal to a null pointer is always
false [-Wtautological-pointer-compare]^M
        if (&obj->base == NULL) {^M
             ~~~~~^~~~    ~~~~^M
/usr/src/svn/sys/modules/drm2/i915kms/../../../dev/drm2/i915/i915_gem.c:1259:12:
warning: comparison of address of 'obj->base' equal to a null pointer is always
false [-Wtautological-pointer-compare]^M
        if (&obj->base == NULL) {^M
             ~~~~~^~~~    ~~~~^M
/usr/src/svn/sys/modules/drm2/i915kms/../../../dev/drm2/i915/i915_gem.c:1299:12:
warning: comparison of address of 'obj->base' equal to a null pointer is always
false [-Wtautological-pointer-compare]^M
        if (&obj->base == NULL) {^M
             ~~~~~^~~~    ~~~~^M
/usr/src/svn/sys/modules/drm2/i915kms/../../../dev/drm2/i915/i915_gem.c:1725:12:
warning: comparison of address of 'obj->base' equal to a null pointer is always
false [-Wtautological-pointer-compare]^M
        if (&obj->base == NULL) {^M
             ~~~~~^~~~    ~~~~^M
/usr/src/svn/sys/modules/drm2/i915kms/../../../dev/drm2/i915/i915_gem.c:3595:12:
warning: comparison of address of 'obj->base' equal to a null pointer is always
false [-Wtautological-pointer-compare]^M
        if (&obj->base == NULL) {^M
             ~~~~~^~~~    ~~~~^M
--- all_subdir_drm ---^M
--- drm.ko ---^M
ld -d -warn-common -r -d -o drm.ko ati_pcigart.o drm_agpsupport.o drm_auth.o
drm_bufs.o drm_context.o drm_dma.o drm_drawable.o drm_drv.o drm_fops.o
drm_hashtab.o drm_ioctl.o drm_irq.o drm_lock.o drm_memory.o drm_mm.o drm_pci.o
drm_scatter.o drm_sman.o drm_sysctl.o drm_vm.o^M
--- all_subdir_drm2 ---^M
/usr/src/svn/sys/modules/drm2/i915kms/../../../dev/drm2/i915/i915_gem.c:3632:12:
warning: comparison of address of 'obj->base' equal to a null pointer is always
false [-Wtautological-pointer-compare]^M
        if (&obj->base == NULL) {^M
             ~~~~~^~~~    ~~~~^M
/usr/src/svn/sys/modules/drm2/i915kms/../../../dev/drm2/i915/i915_gem.c:3685:12:
warning: comparison of address of 'obj->base' equal to a null pointer is always
false [-Wtautological-pointer-compare]^M
        if (&obj->base == NULL) {^M
             ~~~~~^~~~    ~~~~^M
--- all_subdir_drm ---^M
--- all_subdir_i915kms ---^M
/usr/src/svn/sys/modules/drm2/i915kms/../../../dev/drm2/i915/i915_gem_execbuffer.c:798:13:
warning: comparison of address of 'obj->base' equal to a null pointer is always
false [-Wtautological-pointer-compare]^M
                if (&obj->base == NULL) {^M
                     ~~~~~^~~~    ~~~~^M
--- all_subdir_i915kms ---^M
/usr/src/svn/sys/modules/drm2/i915kms/../../../dev/drm2/i915/i915_gem_execbuffer.c:1275:13:
warning: comparison of address of 'obj->base' equal to a null pointer is always
false [-Wtautological-pointer-compare]^M
                if (&obj->base == NULL) {^M
                     ~~~~~^~~~    ~~~~^M
--- all_subdir_i915kms ---^M
/usr/src/svn/sys/modules/drm2/i915kms/../../../dev/drm2/i915/i915_gem_tiling.c:311:12:
warning: comparison of address of 'obj->base' equal to a null pointer is always
false [-Wtautological-pointer-compare]^M
        if (&obj->base == NULL)^M
             ~~~~~^~~~    ~~~~^M
/usr/src/svn/sys/modules/drm2/i915kms/../../../dev/drm2/i915/i915_gem_tiling.c:418:12:
warning: comparison of address of 'obj->base' equal to a null pointer is always
false [-Wtautological-pointer-compare]^M
        if (&obj->base == NULL)^M
             ~~~~~^~~~    ~~~~^M
/usr/src/svn/sys/modules/drm2/i915kms/../../../dev/drm2/i915/intel_display.c:5161:12:
warning: comparison of address of 'obj->base' equal to a null pointer is always
false [-Wtautological-pointer-compare]^M
        if (&obj->base == NULL)^M
             ~~~~~^~~~    ~~~~^M
/usr/src/svn/sys/modules/drm2/i915kms/../../../dev/drm2/i915/intel_display.c:6731:12:
warning: comparison of address of 'obj->base' equal to a null pointer is always
false [-Wtautological-pointer-compare]^M
        if (&obj->base == NULL)^M
             ~~~~~^~~~    ~~~~^M
--- all_subdir_drm2 ---^M
/usr/src/svn/sys/modules/drm2/i915kms/../../../dev/drm2/i915/intel_overlay.c:1153:15:
warning: comparison of address of 'new_bo->base' equal to a null pointer is
always false [-Wtautological-pointer-compare]^M
        if (&new_bo->base == NULL) {^M
             ~~~~~~~~^~~~    ~~~~^M

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