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Fri, 5 Sep 2025 23:18:55 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim; t=1757107147; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:content-language:in-reply-to:references:autocrypt; bh=qA1p1HiFom/b+0AkpRGF5adHJ6OWSNZnIjm3LD9NiNI=; b=MMxqQw39zzNxMUiU+Ngye0iqho7zJY6XaGDgaaXAX/KvI0gAw4nLq30LnlHOIknyRTSWkm YKggeAdaWJLgsFluZQKzLLpU+iRe+J09IuPyvT/J263NM9ZuDQM+4VR2Z5hlxWigItBrPa jiR7aoiKj3eQCY6hQVJJYp9Ckl9S6q16agMF/m6nX7GirM8rKL1UssAe2HSMHgf6uV3otW v5u5d74f0QnJsA7uyKIC0c8RoXVh/j1JF1bZFWtjg83VVsTvktq1WpSzZrIxrUm0pI0fgB LksPb9YSRv91Sckvye8rlgWeIVjUWUCbVkYf94DHzK/vU2SKpUm+QPc8SEU+Jw== Message-ID: Date: Fri, 5 Sep 2025 23:18:55 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 18/58] dyndbg: change __dynamic_func_call_cls* macros into expressions To: Jim Cromie , linux-kernel@vger.kernel.org, jbaron@akamai.com, gregkh@linuxfoundation.org, ukaszb@chromium.org Cc: dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org, intel-gvt-dev@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, daniel.vetter@ffwll.ch, tvrtko.ursulin@linux.intel.com, jani.nikula@intel.com, ville.syrjala@linux.intel.com, seanpaul@chromium.org, robdclark@gmail.com, groeck@google.com, yanivt@google.com, bleung@google.com, quic_saipraka@quicinc.com, will@kernel.org, catalin.marinas@arm.com, quic_psodagud@quicinc.com, maz@kernel.org, arnd@arndb.de, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, mingo@redhat.com References: <20250803035816.603405-1-jim.cromie@gmail.com> <20250803035816.603405-19-jim.cromie@gmail.com> Content-Language: en-US From: Louis Chauvet Autocrypt: addr=louis.chauvet@bootlin.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Last-TLS-Session-Version: TLSv1.3 Le 03/08/2025 à 05:57, Jim Cromie a écrit : > The Xe driver's XE_IOCTL_DBG macro calls drm_dbg() from inside an if > (expression). This breaks when CONFIG_DRM_USE_DYNAMIC_DEBUG=y because > the invoked macro has a do-while-0 wrapper, and is not an expression. > > if (cond && (drm_dbg("expr-form"),1)) { > ... do some more stuff > } > > Fix for this usage by changing __dynamic_func_call_cls{,_no_desc} > macros into expressions, by replacing the do-while-0s with a ({ }) > wrapper. In the common usage, the trailing ';' converts the > expression into a statement. > > drm_dbg("statement form"); > > Signed-off-by: Jim Cromie Reviewed-by: Louis Chauvet > --- > --- > include/linux/dynamic_debug.h | 8 ++++---- > 1 file changed, 4 insertions(+), 4 deletions(-) > > diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h > index 769f02456c8e0..1785ef5b93b15 100644 > --- a/include/linux/dynamic_debug.h > +++ b/include/linux/dynamic_debug.h > @@ -217,20 +217,20 @@ void __dynamic_ibdev_dbg(struct _ddebug *descriptor, > * (|_cls): adds in _DPRINT_CLASS_DFLT as needed > * (|_no_desc): former gets callsite descriptor as 1st arg (for prdbgs) > */ > -#define __dynamic_func_call_cls(id, cls, fmt, func, ...) do { \ > +#define __dynamic_func_call_cls(id, cls, fmt, func, ...) ({ \ > DEFINE_DYNAMIC_DEBUG_METADATA_CLS(id, cls, fmt); \ > if (DYNAMIC_DEBUG_BRANCH(id)) \ > func(&id, ##__VA_ARGS__); \ > -} while (0) > +}) > #define __dynamic_func_call(id, fmt, func, ...) \ > __dynamic_func_call_cls(id, _DPRINTK_CLASS_DFLT, fmt, \ > func, ##__VA_ARGS__) > > -#define __dynamic_func_call_cls_no_desc(id, cls, fmt, func, ...) do { \ > +#define __dynamic_func_call_cls_no_desc(id, cls, fmt, func, ...) ({ \ > DEFINE_DYNAMIC_DEBUG_METADATA_CLS(id, cls, fmt); \ > if (DYNAMIC_DEBUG_BRANCH(id)) \ > func(__VA_ARGS__); \ > -} while (0) > +}) > #define __dynamic_func_call_no_desc(id, fmt, func, ...) \ > __dynamic_func_call_cls_no_desc(id, _DPRINTK_CLASS_DFLT, \ > fmt, func, ##__VA_ARGS__) -- Louis Chauvet, Bootlin Embedded Linux and Kernel engineering https://bootlin.com