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[34.83.59.201]) by smtp.gmail.com with ESMTPSA id b9-20020a056a000cc900b004f7a986fc78sm17867328pfv.11.2022.03.20.19.07.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 20 Mar 2022 19:07:23 -0700 (PDT) Date: Mon, 21 Mar 2022 02:07:19 +0000 From: Carlos Llamas To: Miklos Szeredi Cc: Greg Kroah-Hartman , Alessio Balsini , Masahiro Yamada , Arnd Bergmann , kernel-team , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] fuse: fix integer type usage in uapi header Message-ID: References: <20220318171405.2728855-1-cmllamas@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Mar 18, 2022 at 08:24:55PM +0100, Miklos Szeredi wrote: > On Fri, 18 Mar 2022 at 18:14, Carlos Llamas wrote: > > > > Kernel uapi headers are supposed to use __[us]{8,16,32,64} defined by > > instead of 'uint32_t' and similar. This patch changes > > all the definitions in this header to use the correct type. Previous > > discussion of this topic can be found here: > > > > https://lkml.org/lkml/2019/6/5/18 > > This is effectively a revert of these two commits: > > 4c82456eeb4d ("fuse: fix type definitions in uapi header") > 7e98d53086d1 ("Synchronize fuse header with one used in library") > > And so we've gone full circle and back to having to modify the header > to be usable in the cross platform library... > > And also made lots of churn for what reason exactly? There are currently only two uapi headers making use of C99 types and one is . This approach results in different typedefs being selected when compiling for userspace vs the kernel. Plus only __u32 and similar types align with the coding style as described in 5(e). Yet, there is still the cross platform concern you mention. I think the best way to accommodate this while still conforming with the __u32 types is to follow something similar to 1a95916f5465 ("drm: Add compatibility #ifdefs for *BSD"). Basically doing this: #if defined(__KERNEL__) || defined(__linux__) #include #else #include typedef uint16_t __u16; typedef int32_t __s32; typedef uint32_t __u32; typedef int64_t __s64; typedef uint64_t __u64; #endif This alternative selects the correct uapi types for both __KERNEL__ and __linux__ cases which is the main goal of this patch and it's just minor fixes from 7e98d53086d1 ("Synchronize header with one used in library"). I see there where previous attempts to address similar changes here: https://lkml.org/lkml/2013/3/11/620 https://lkml.org/lkml/2013/4/15/487 So, if you agree with the approach above I'd be happy to send a separate patch on top to address the *BSD compatibility. Thanks, Carlos Llamas