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De Francesco" To: Peter Zijlstra , Dan Williams , linux-kernel@vger.kernel.org Cc: linux-cxl@vger.kernel.org, Ingo Molnar , Dave Jiang , Jonathan Cameron , Ira Weiny , "Fabio M. De Francesco" Subject: [PATCH 0/3 v5] Add cond_guard() to conditional guards Date: Sat, 17 Feb 2024 11:59:01 +0100 Message-ID: <20240217105904.1912368-1-fabio.maria.de.francesco@linux.intel.com> X-Mailer: git-send-email 2.43.2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1791148247709231774 X-GMAIL-MSGID: 1791148247709231774 Add cond_guard() macro to conditional guards. Show how to use it by converting two functions in drivers/cxl to replace open-coded up_read() in show_targetN() and in cxl_inject_poison() and avoid to 'goto' to a cleanup block marked by an 'out' label. The second conversion is added with v5 to show that the most recent implementation of cond_guard() can also be used more than once in the same scope. Cc: Dave Jiang Cc: Peter Zijlstra Suggested-by: Dan Williams Suggested-by: Ira Weiny Suggested-by: Jonathan Cameron Signed-off-by: Fabio M. De Francesco --- Changes from RFC v5: Changed the interface of cond_guard() to take a statement or statement-expression as its second argument to conform to Dan's suggestion (thanks). Changes from v1: Fixed a grammar error in the commit message of 1/2; replaced the name of the second argument of cond_guard() with '_fail' according to Jonathan's comments (thanks). Changes from v2: Changed macro's implementation to add an 'else' to protect against it being used incorrectly within another if() block. Suggested by Dan (thanks). The Reviewed-by tags on 1/2 are not forwarded because the implementation of cond_guard() has changed. Removed a redundant 'else' from show_targetN() in 2/2. Changes from v3: Added braces around empty body in an 'else' statement in cond_guard(). Added Reviewed-by tags (Dave, Ira - thanks). Changes from v4: Made it possible to call cond_guard() more than once in the same scope. Jonathan suggested a more elegant implementation than the one I had thought. It uses an exhisting helper instead of creating an ad hoc one (thanks). Added a second conversion to show that cond_guard() can be used twice in the same scope. Deleted the Reviewed-by tags from 1/3 since the implementation of cond_guard() has significantly been reworked to allow multiple calls. Fabio M. De Francesco (3): cleanup: Add cond_guard() to conditional guards cxl/region: Use cond_guard() in show_targetN() cxl/memdev: Use cond_guard() in cxl_inject_poison() drivers/cxl/core/memdev.c | 19 +++++-------------- drivers/cxl/core/region.c | 16 ++++------------ include/linux/cleanup.h | 20 ++++++++++++++++++++ 3 files changed, 29 insertions(+), 26 deletions(-)