Only x86 and in some cases PPC have support added in drm_cache.c for the clflush class of functions. However warning once is sufficient to taint the log instead of spamming it with "Architecture has no drm_cache.c support" every few millisecond. Switch to WARN_ONCE() so we still get the log message, but only once, together with the warning. E.g:
------------[ cut here ]------------ Architecture has no drm_cache.c support WARNING: CPU: 80 PID: 888 at drivers/gpu/drm/drm_cache.c:139 drm_clflush_sg+0x40/0x50 [drm] ...
v2 (Jani): use WARN_ONCE() and keep the message previously on pr_err()
Cc: Maarten Lankhorst maarten.lankhorst@linux.intel.com Cc: Maxime Ripard mripard@kernel.org Cc: Thomas Zimmermann tzimmermann@suse.de Cc: David Airlie airlied@linux.ie Cc: Daniel Vetter daniel@ffwll.ch Signed-off-by: Lucas De Marchi lucas.demarchi@intel.com ---
v3: No changes from previous version, just submitting to the right mailing list
drivers/gpu/drm/drm_cache.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/drm_cache.c b/drivers/gpu/drm/drm_cache.c index f19d9acbe959..2c3fa5677f7e 100644 --- a/drivers/gpu/drm/drm_cache.c +++ b/drivers/gpu/drm/drm_cache.c @@ -112,8 +112,7 @@ drm_clflush_pages(struct page *pages[], unsigned long num_pages) kunmap_atomic(page_virtual); } #else - pr_err("Architecture has no drm_cache.c support\n"); - WARN_ON_ONCE(1); + WARN_ONCE(1, "Architecture has no drm_cache.c support\n"); #endif } EXPORT_SYMBOL(drm_clflush_pages); @@ -143,8 +142,7 @@ drm_clflush_sg(struct sg_table *st) if (wbinvd_on_all_cpus()) pr_err("Timed out waiting for cache flush\n"); #else - pr_err("Architecture has no drm_cache.c support\n"); - WARN_ON_ONCE(1); + WARN_ONCE(1, "Architecture has no drm_cache.c support\n"); #endif } EXPORT_SYMBOL(drm_clflush_sg); @@ -177,8 +175,7 @@ drm_clflush_virt_range(void *addr, unsigned long length) if (wbinvd_on_all_cpus()) pr_err("Timed out waiting for cache flush\n"); #else - pr_err("Architecture has no drm_cache.c support\n"); - WARN_ON_ONCE(1); + WARN_ONCE(1, "Architecture has no drm_cache.c support\n"); #endif } EXPORT_SYMBOL(drm_clflush_virt_range);